/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 1995-2007 Apple Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
*
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
*
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
-/* Copyright (c) 1995-1998 Apple Computer, Inc. All Rights Reserved */
/*
* Copyright (c) 1982, 1986, 1989, 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* @(#)kern_sig.c 8.7 (Berkeley) 4/18/94
*/
+/*
+ * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
+ * support for mandatory and extensible security protections. This notice
+ * is included in support of clause 2.2 (b) of the Apple Public License,
+ * Version 2.0.
+ */
#define SIGPROP /* include signal properties table */
#include <sys/param.h>
-#include <sys/signalvar.h>
#include <sys/resourcevar.h>
-#include <sys/namei.h>
-#include <sys/vnode.h>
-#include <sys/proc.h>
+#include <sys/proc_internal.h>
+#include <sys/kauth.h>
#include <sys/systm.h>
#include <sys/timeb.h>
#include <sys/times.h>
-#include <sys/buf.h>
#include <sys/acct.h>
-#include <sys/file.h>
+#include <sys/file_internal.h>
#include <sys/kernel.h>
#include <sys/wait.h>
-#include <sys/ktrace.h>
+#include <sys/signalvar.h>
#include <sys/syslog.h>
#include <sys/stat.h>
#include <sys/lock.h>
+#include <sys/kdebug.h>
#include <sys/mount.h>
+#include <sys/sysproto.h>
+
+#include <security/audit/audit.h>
+
+#include <machine/spl.h>
#include <kern/cpu_number.h>
#include <sys/vm.h>
#include <sys/user.h> /* for coredump */
#include <kern/ast.h> /* for APC support */
+#include <kern/task.h> /* extern void *get_bsdtask_info(task_t); */
#include <kern/thread.h>
+#include <kern/sched_prim.h>
#include <kern/thread_call.h>
+#include <mach/exception.h>
+#include <mach/task.h>
+#include <mach/thread_act.h>
+#include <libkern/OSAtomic.h>
-void stop __P((struct proc *p));
-int cansignal __P((struct proc *, struct pcred *, struct proc *, int));
-int killpg1 __P((struct proc *, int, int, int));
-void sigexit_locked __P((struct proc *, int));
-void setsigvec __P((struct proc *, int, struct sigaction *));
-void exit1 __P((struct proc *, int));
-int signal_lock __P((struct proc *));
-int signal_unlock __P((struct proc *));
-void signal_setast __P((thread_act_t *));
-void signal_clearast __P((thread_act_t *));
-void psignal_lock __P((struct proc *, int, int, int));
+#include <sys/sdt.h>
-#if SIGNAL_DEBUG
-void ram_printf __P((int));
-int ram_debug=0;
-unsigned int rdebug_proc=0;
-void
-ram_printf(int x)
+/*
+ * Missing prototypes that Mach should export
+ *
+ * +++
+ */
+extern int thread_enable_fpe(thread_t act, int onoff);
+extern thread_t port_name_to_thread(mach_port_name_t port_name);
+extern kern_return_t get_signalact(task_t , thread_t *, int);
+extern unsigned int get_useraddr(void);
+extern kern_return_t task_suspend_internal(task_t);
+extern kern_return_t task_resume_internal(task_t);
+
+/*
+ * ---
+ */
+
+extern void doexception(int exc, mach_exception_code_t code,
+ mach_exception_subcode_t sub);
+
+static void stop(proc_t, proc_t);
+int cansignal(proc_t, kauth_cred_t, proc_t, int, int);
+int killpg1(proc_t, int, int, int, int);
+int setsigvec(proc_t, thread_t, int, struct __kern_sigaction *, boolean_t in_sigstart);
+static void psignal_uthread(thread_t, int);
+kern_return_t do_bsdexception(int, int, int);
+void __posix_sem_syscall_return(kern_return_t);
+
+/* implementations in osfmk/kern/sync_sema.c. We do not want port.h in this scope, so void * them */
+kern_return_t semaphore_timedwait_signal_trap_internal(mach_port_name_t, mach_port_name_t, unsigned int, clock_res_t, void (*)(kern_return_t));
+kern_return_t semaphore_timedwait_trap_internal(mach_port_name_t, unsigned int, clock_res_t, void (*)(kern_return_t));
+kern_return_t semaphore_wait_signal_trap_internal(mach_port_name_t, mach_port_name_t, void (*)(kern_return_t));
+kern_return_t semaphore_wait_trap_internal(mach_port_name_t, void (*)(kern_return_t));
+
+static int filt_sigattach(struct knote *kn);
+static void filt_sigdetach(struct knote *kn);
+static int filt_signal(struct knote *kn, long hint);
+static void filt_signaltouch(struct knote *kn, struct kevent64_s *kev,
+ long type);
+
+struct filterops sig_filtops = {
+ .f_attach = filt_sigattach,
+ .f_detach = filt_sigdetach,
+ .f_event = filt_signal,
+ .f_touch = filt_signaltouch,
+};
+
+/* structures and fns for killpg1 iterartion callback and filters */
+struct killpg1_filtargs {
+ int posix;
+ proc_t cp;
+};
+
+struct killpg1_iterargs {
+ proc_t cp;
+ kauth_cred_t uc;
+ int signum;
+ int * nfoundp;
+ int zombie;
+};
+
+static int killpg1_filt(proc_t p, void * arg);
+static int killpg1_pgrpfilt(proc_t p, __unused void * arg);
+static int killpg1_callback(proc_t p, void * arg);
+
+static int pgsignal_filt(proc_t p, void * arg);
+static int pgsignal_callback(proc_t p, void * arg);
+static kern_return_t get_signalthread(proc_t, int, thread_t *);
+
+
+/* flags for psignal_internal */
+#define PSIG_LOCKED 0x1
+#define PSIG_VFORK 0x2
+#define PSIG_THREAD 0x4
+
+
+static void psignal_internal(proc_t p, task_t task, thread_t thread, int flavor, int signum);
+
+/*
+ * NOTE: Source and target may *NOT* overlap! (target is smaller)
+ */
+static void
+sigaltstack_kern_to_user32(struct kern_sigaltstack *in, struct user32_sigaltstack *out)
{
- printf("x is %d",x);
+ out->ss_sp = CAST_DOWN_EXPLICIT(user32_addr_t, in->ss_sp);
+ out->ss_size = CAST_DOWN_EXPLICIT(user32_size_t, in->ss_size);
+ out->ss_flags = in->ss_flags;
+}
+static void
+sigaltstack_kern_to_user64(struct kern_sigaltstack *in, struct user64_sigaltstack *out)
+{
+ out->ss_sp = in->ss_sp;
+ out->ss_size = in->ss_size;
+ out->ss_flags = in->ss_flags;
}
-#endif /* SIGNAL_DEBUG */
-int
-signal_lock(struct proc *p)
+/*
+ * NOTE: Source and target may are permitted to overlap! (source is smaller);
+ * this works because we copy fields in order from the end of the struct to
+ * the beginning.
+ */
+static void
+sigaltstack_user32_to_kern(struct user32_sigaltstack *in, struct kern_sigaltstack *out)
{
-#if SIGNAL_DEBUG
-#ifdef __ppc__
- {
- int register sp, *fp, numsaved;
-
- __asm__ volatile("mr %0,r1" : "=r" (sp));
-
- fp = (int *)*((int *)sp);
- for (numsaved = 0; numsaved < 3; numsaved++) {
- p->lockpc[numsaved] = fp[2];
- if ((int)fp <= 0)
- break;
- fp = (int *)*fp;
- }
- }
-#endif /* __ppc__ */
-#endif /* SIGNAL_DEBUG */
+ out->ss_flags = in->ss_flags;
+ out->ss_size = in->ss_size;
+ out->ss_sp = CAST_USER_ADDR_T(in->ss_sp);
+}
+static void
+sigaltstack_user64_to_kern(struct user64_sigaltstack *in, struct kern_sigaltstack *out)
+{
+ out->ss_flags = in->ss_flags;
+ out->ss_size = in->ss_size;
+ out->ss_sp = in->ss_sp;
+}
- return(lockmgr(&p->signal_lock, LK_EXCLUSIVE, 0, (struct proc *)0));
+static void
+sigaction_kern_to_user32(struct kern_sigaction *in, struct user32_sigaction *out)
+{
+ /* This assumes 32 bit __sa_handler is of type sig_t */
+ out->__sigaction_u.__sa_handler = CAST_DOWN_EXPLICIT(user32_addr_t,in->__sigaction_u.__sa_handler);
+ out->sa_mask = in->sa_mask;
+ out->sa_flags = in->sa_flags;
+}
+static void
+sigaction_kern_to_user64(struct kern_sigaction *in, struct user64_sigaction *out)
+{
+ /* This assumes 32 bit __sa_handler is of type sig_t */
+ out->__sigaction_u.__sa_handler = in->__sigaction_u.__sa_handler;
+ out->sa_mask = in->sa_mask;
+ out->sa_flags = in->sa_flags;
}
-int
-signal_unlock(struct proc *p)
+static void
+__sigaction_user32_to_kern(struct __user32_sigaction *in, struct __kern_sigaction *out)
{
-#if SIGNAL_DEBUG
-#ifdef __ppc__
- {
- int register sp, *fp, numsaved;
-
- __asm__ volatile("mr %0,r1" : "=r" (sp));
-
- fp = (int *)*((int *)sp);
- for (numsaved = 0; numsaved < 3; numsaved++) {
- p->unlockpc[numsaved] = fp[2];
- if ((int)fp <= 0)
- break;
- fp = (int *)*fp;
- }
- }
-#endif /* __ppc__ */
-#endif /* SIGNAL_DEBUG */
+ out->__sigaction_u.__sa_handler = CAST_USER_ADDR_T(in->__sigaction_u.__sa_handler);
+ out->sa_tramp = CAST_USER_ADDR_T(in->sa_tramp);
+ out->sa_mask = in->sa_mask;
+ out->sa_flags = in->sa_flags;
+}
- return(lockmgr(&p->signal_lock, LK_RELEASE, (simple_lock_t)0, (struct proc *)0));
+static void
+__sigaction_user64_to_kern(struct __user64_sigaction *in, struct __kern_sigaction *out)
+{
+ out->__sigaction_u.__sa_handler = in->__sigaction_u.__sa_handler;
+ out->sa_tramp = in->sa_tramp;
+ out->sa_mask = in->sa_mask;
+ out->sa_flags = in->sa_flags;
}
+#if SIGNAL_DEBUG
+void ram_printf(int);
+int ram_debug=0;
+unsigned int rdebug_proc=0;
void
-signal_setast(sig_actthread)
-thread_act_t *sig_actthread;
+ram_printf(int x)
{
- thread_ast_set(sig_actthread, AST_BSD);
- if ((thread_act_t *)current_act() == sig_actthread)
- ast_on(AST_BSD);
+ printf("x is %d",x);
+
}
+#endif /* SIGNAL_DEBUG */
+
void
-signal_clearast(sig_actthread)
-thread_act_t *sig_actthread;
+signal_setast(thread_t sig_actthread)
{
- thread_ast_clear(sig_actthread, AST_BSD);
- if ((thread_act_t *)current_act() == sig_actthread)
- ast_off(AST_BSD);
+ act_set_astbsd(sig_actthread);
}
/*
- * Can process p, with pcred pc, send the signal signum to process q?
+ * Can process p, with ucred uc, send the signal signum to process q?
+ * uc is refcounted by the caller so internal fileds can be used safely
+ * when called with zombie arg, list lock is held
*/
int
-cansignal(p, pc, q, signum)
- struct proc *p;
- struct pcred *pc;
- struct proc *q;
- int signum;
+cansignal(proc_t p, kauth_cred_t uc, proc_t q, int signum, int zombie)
{
- if (pc->pc_ucred->cr_uid == 0)
+ kauth_cred_t my_cred;
+ struct session * p_sessp = SESSION_NULL;
+ struct session * q_sessp = SESSION_NULL;
+#if CONFIG_MACF
+ int error;
+
+ error = mac_proc_check_signal(p, q, signum);
+ if (error)
+ return (0);
+#endif
+
+ /* you can signal yourself */
+ if (p == q)
+ return(1);
+
+ if (!suser(uc, NULL))
return (1); /* root can always signal */
- if (signum == SIGCONT && q->p_session == p->p_session)
+ if (zombie == 0)
+ proc_list_lock();
+ if (p->p_pgrp != PGRP_NULL)
+ p_sessp = p->p_pgrp->pg_session;
+ if (q->p_pgrp != PGRP_NULL)
+ q_sessp = q->p_pgrp->pg_session;
+
+ if (signum == SIGCONT && q_sessp == p_sessp) {
+ if (zombie == 0)
+ proc_list_unlock();
return (1); /* SIGCONT in session */
+ }
+
+ if (zombie == 0)
+ proc_list_unlock();
/*
- * Using kill(), only certain signals can be sent to setugid
- * child processes
+ * If the real or effective UID of the sender matches the real
+ * or saved UID of the target, permit the signal to
+ * be sent.
*/
- if (q->p_flag & P_SUGID) {
- switch (signum) {
- case 0:
- case SIGKILL:
- case SIGINT:
- case SIGTERM:
- case SIGSTOP:
- case SIGTTIN:
- case SIGTTOU:
- case SIGTSTP:
- case SIGHUP:
- case SIGUSR1:
- case SIGUSR2:
- if (pc->p_ruid == q->p_cred->p_ruid ||
- pc->pc_ucred->cr_uid == q->p_cred->p_ruid ||
- pc->p_ruid == q->p_ucred->cr_uid ||
- pc->pc_ucred->cr_uid == q->p_ucred->cr_uid)
- return (1);
- }
- return (0);
+ if (zombie == 0)
+ my_cred = kauth_cred_proc_ref(q);
+ else
+ my_cred = proc_ucred(q);
+
+ if (kauth_cred_getruid(uc) == kauth_cred_getruid(my_cred) ||
+ kauth_cred_getruid(uc) == kauth_cred_getsvuid(my_cred) ||
+ kauth_cred_getuid(uc) == kauth_cred_getruid(my_cred) ||
+ kauth_cred_getuid(uc) == kauth_cred_getsvuid(my_cred)) {
+ if (zombie == 0)
+ kauth_cred_unref(&my_cred);
+ return (1);
}
- /* XXX
- * because the P_SUGID test exists, this has extra tests which
- * could be removed.
- */
- if (pc->p_ruid == q->p_cred->p_ruid ||
- pc->p_ruid == q->p_cred->p_svuid ||
- pc->pc_ucred->cr_uid == q->p_cred->p_ruid ||
- pc->pc_ucred->cr_uid == q->p_cred->p_svuid ||
- pc->p_ruid == q->p_ucred->cr_uid ||
- pc->pc_ucred->cr_uid == q->p_ucred->cr_uid)
- return (1);
+ if (zombie == 0)
+ kauth_cred_unref(&my_cred);
+
return (0);
}
-struct sigaction_args {
- int signum;
- struct sigaction *nsa;
- struct sigaction *osa;
-};
+/*
+ * Returns: 0 Success
+ * EINVAL
+ * copyout:EFAULT
+ * copyin:EFAULT
+ *
+ * Notes: Uses current thread as a parameter to inform PPC to enable
+ * FPU exceptions via setsigvec(); this operation is not proxy
+ * safe!
+ */
/* ARGSUSED */
int
-sigaction(p, uap, retval)
- struct proc *p;
- register struct sigaction_args *uap;
- register_t *retval;
+sigaction(proc_t p, struct sigaction_args *uap, __unused int32_t *retval)
{
- struct sigaction vec;
- register struct sigaction *sa;
- register struct sigacts *ps = p->p_sigacts;
- register int signum;
- int bit, error;
+ struct kern_sigaction vec;
+ struct __kern_sigaction __vec;
+
+ struct kern_sigaction *sa = &vec;
+ struct sigacts *ps = p->p_sigacts;
+
+ int signum;
+ int bit, error=0;
signum = uap->signum;
if (signum <= 0 || signum >= NSIG ||
signum == SIGKILL || signum == SIGSTOP)
return (EINVAL);
- sa = &vec;
+
if (uap->osa) {
sa->sa_handler = ps->ps_sigact[signum];
sa->sa_mask = ps->ps_catchmask[signum];
sa->sa_flags |= SA_ONSTACK;
if ((ps->ps_sigintr & bit) == 0)
sa->sa_flags |= SA_RESTART;
- if (p->p_flag & P_NOCLDSTOP)
+ if (ps->ps_siginfo & bit)
+ sa->sa_flags |= SA_SIGINFO;
+ if (ps->ps_signodefer & bit)
+ sa->sa_flags |= SA_NODEFER;
+ if (ps->ps_64regset & bit)
+ sa->sa_flags |= SA_64REGSET;
+ if ((signum == SIGCHLD) && (p->p_flag & P_NOCLDSTOP))
sa->sa_flags |= SA_NOCLDSTOP;
- if (error = copyout((caddr_t)sa, (caddr_t)uap->osa,
- sizeof (vec)))
+ if ((signum == SIGCHLD) && (p->p_flag & P_NOCLDWAIT))
+ sa->sa_flags |= SA_NOCLDWAIT;
+
+ if (IS_64BIT_PROCESS(p)) {
+ struct user64_sigaction vec64;
+
+ sigaction_kern_to_user64(sa, &vec64);
+ error = copyout(&vec64, uap->osa, sizeof(vec64));
+ } else {
+ struct user32_sigaction vec32;
+
+ sigaction_kern_to_user32(sa, &vec32);
+ error = copyout(&vec32, uap->osa, sizeof(vec32));
+ }
+ if (error)
return (error);
}
if (uap->nsa) {
- if (error = copyin((caddr_t)uap->nsa, (caddr_t)sa,
- sizeof (vec)))
+ if (IS_64BIT_PROCESS(p)) {
+ struct __user64_sigaction __vec64;
+
+ error = copyin(uap->nsa, &__vec64, sizeof(__vec64));
+ __sigaction_user64_to_kern(&__vec64, &__vec);
+ } else {
+ struct __user32_sigaction __vec32;
+
+ error = copyin(uap->nsa, &__vec32, sizeof(__vec32));
+ __sigaction_user32_to_kern(&__vec32, &__vec);
+ }
+ if (error)
return (error);
- setsigvec(p, signum, sa);
+ __vec.sa_flags &= SA_USERSPACE_MASK; /* Only pass on valid sa_flags */
+ error = setsigvec(p, current_thread(), signum, &__vec, FALSE);
}
- return (0);
+ return (error);
+}
+
+/* Routines to manipulate bits on all threads */
+int
+clear_procsiglist(proc_t p, int bit, boolean_t in_signalstart)
+{
+ struct uthread * uth;
+ thread_t thact;
+
+ proc_lock(p);
+ if (!in_signalstart)
+ proc_signalstart(p, 1);
+
+ if ((p->p_lflag & P_LINVFORK) && p->p_vforkact) {
+ thact = p->p_vforkact;
+ uth = (struct uthread *)get_bsdthread_info(thact);
+ if (uth) {
+ uth->uu_siglist &= ~bit;
+ }
+ if (!in_signalstart)
+ proc_signalend(p, 1);
+ proc_unlock(p);
+ return(0);
+ }
+
+ TAILQ_FOREACH(uth, &p->p_uthlist, uu_list) {
+ uth->uu_siglist &= ~bit;
+ }
+ p->p_siglist &= ~bit;
+ if (!in_signalstart)
+ proc_signalend(p, 1);
+ proc_unlock(p);
+
+ return(0);
}
+
static int
-reset_sigbits(thread_act_t th_act, int bit)
+unblock_procsigmask(proc_t p, int bit)
{
-struct uthread *ut;
- ut = get_bsdthread_info(th_act);
- if (ut) {
- ut->uu_sig &= ~bit;
+ struct uthread * uth;
+ thread_t thact;
+
+ proc_lock(p);
+ proc_signalstart(p, 1);
+
+ if ((p->p_lflag & P_LINVFORK) && p->p_vforkact) {
+ thact = p->p_vforkact;
+ uth = (struct uthread *)get_bsdthread_info(thact);
+ if (uth) {
+ uth->uu_sigmask &= ~bit;
+ }
+ p->p_sigmask &= ~bit;
+ proc_signalend(p, 1);
+ proc_unlock(p);
+ return(0);
+ }
+ TAILQ_FOREACH(uth, &p->p_uthlist, uu_list) {
+ uth->uu_sigmask &= ~bit;
}
+ p->p_sigmask &= ~bit;
+
+ proc_signalend(p, 1);
+ proc_unlock(p);
+ return(0);
}
-int
-clear_sigbits (struct proc *p, int bit)
+static int
+block_procsigmask(proc_t p, int bit)
{
-task_t task = p->task;
+ struct uthread * uth;
+ thread_t thact;
- p->p_siglist &= ~(bit);
- task_act_iterate_wth_args(task, reset_sigbits, bit);
+ proc_lock(p);
+ proc_signalstart(p, 1);
+
+ if ((p->p_lflag & P_LINVFORK) && p->p_vforkact) {
+ thact = p->p_vforkact;
+ uth = (struct uthread *)get_bsdthread_info(thact);
+ if (uth) {
+ uth->uu_sigmask |= bit;
+ }
+ p->p_sigmask |= bit;
+ proc_signalend(p, 1);
+ proc_unlock(p);
+ return(0);
+ }
+ TAILQ_FOREACH(uth, &p->p_uthlist, uu_list) {
+ uth->uu_sigmask |= bit;
+ }
+ p->p_sigmask |= bit;
+
+ proc_signalend(p, 1);
+ proc_unlock(p);
return(0);
}
+int
+set_procsigmask(proc_t p, int bit)
+{
+ struct uthread * uth;
+ thread_t thact;
-void
-setsigvec(p, signum, sa)
- register struct proc *p;
- int signum;
- register struct sigaction *sa;
+ proc_lock(p);
+ proc_signalstart(p, 1);
+
+ if ((p->p_lflag & P_LINVFORK) && p->p_vforkact) {
+ thact = p->p_vforkact;
+ uth = (struct uthread *)get_bsdthread_info(thact);
+ if (uth) {
+ uth->uu_sigmask = bit;
+ }
+ p->p_sigmask = bit;
+ proc_signalend(p, 1);
+ proc_unlock(p);
+ return(0);
+ }
+ TAILQ_FOREACH(uth, &p->p_uthlist, uu_list) {
+ uth->uu_sigmask = bit;
+ }
+ p->p_sigmask = bit;
+ proc_signalend(p, 1);
+ proc_unlock(p);
+
+ return(0);
+}
+
+/* XXX should be static? */
+/*
+ * Notes: The thread parameter is used in the PPC case to select the
+ * thread on which the floating point exception will be enabled
+ * or disabled. We can't simply take current_thread(), since
+ * this is called from posix_spawn() on the not currently running
+ * process/thread pair.
+ *
+ * We mark thread as unused to alow compilation without warning
+ * on non-PPC platforms.
+ */
+int
+setsigvec(proc_t p, __unused thread_t thread, int signum, struct __kern_sigaction *sa, boolean_t in_sigstart)
{
- register struct sigacts *ps = p->p_sigacts;
- register int bit;
+ struct sigacts *ps = p->p_sigacts;
+ int bit;
+ if ((signum == SIGKILL || signum == SIGSTOP) &&
+ sa->sa_handler != SIG_DFL)
+ return(EINVAL);
bit = sigmask(signum);
/*
* Change setting atomically.
*/
ps->ps_sigact[signum] = sa->sa_handler;
+ ps->ps_trampact[signum] = sa->sa_tramp;
ps->ps_catchmask[signum] = sa->sa_mask &~ sigcantmask;
+ if (sa->sa_flags & SA_SIGINFO)
+ ps->ps_siginfo |= bit;
+ else
+ ps->ps_siginfo &= ~bit;
+ if (sa->sa_flags & SA_64REGSET)
+ ps->ps_64regset |= bit;
+ else
+ ps->ps_64regset &= ~bit;
if ((sa->sa_flags & SA_RESTART) == 0)
ps->ps_sigintr |= bit;
else
ps->ps_usertramp |= bit;
else
ps->ps_usertramp &= ~bit;
+ if (sa->sa_flags & SA_RESETHAND)
+ ps->ps_sigreset |= bit;
+ else
+ ps->ps_sigreset &= ~bit;
+ if (sa->sa_flags & SA_NODEFER)
+ ps->ps_signodefer |= bit;
+ else
+ ps->ps_signodefer &= ~bit;
if (signum == SIGCHLD) {
if (sa->sa_flags & SA_NOCLDSTOP)
- p->p_flag |= P_NOCLDSTOP;
+ OSBitOrAtomic(P_NOCLDSTOP, &p->p_flag);
+ else
+ OSBitAndAtomic(~((uint32_t)P_NOCLDSTOP), &p->p_flag);
+ if ((sa->sa_flags & SA_NOCLDWAIT) || (sa->sa_handler == SIG_IGN))
+ OSBitOrAtomic(P_NOCLDWAIT, &p->p_flag);
else
- p->p_flag &= ~P_NOCLDSTOP;
+ OSBitAndAtomic(~((uint32_t)P_NOCLDWAIT), &p->p_flag);
}
+
/*
* Set bit in p_sigignore for signals that are set to SIG_IGN,
* and for signals set to SIG_DFL where the default is to ignore.
*/
if (sa->sa_handler == SIG_IGN ||
(sigprop[signum] & SA_IGNORE && sa->sa_handler == SIG_DFL)) {
- p->p_siglist &= ~bit; /* never to be seen again */
- /*
- * If this is a thread signal, clean out the
- * threads as well.
- */
- if (bit & threadmask) {
- register task_t task = p->task;
- task_act_iterate_wth_args(task, reset_sigbits, bit);
- }
+ clear_procsiglist(p, bit, in_sigstart);
if (signum != SIGCONT)
p->p_sigignore |= bit; /* easier in psignal */
p->p_sigcatch &= ~bit;
else
p->p_sigcatch |= bit;
}
+ return(0);
}
/*
* set to ignore signals that are ignored by default.
*/
void
-siginit(p)
- struct proc *p;
+siginit(proc_t p)
{
- register int i;
+ int i;
- for (i = 0; i < NSIG; i++)
+ for (i = 1; i < NSIG; i++)
if (sigprop[i] & SA_IGNORE && i != SIGCONT)
p->p_sigignore |= sigmask(i);
}
* Reset signals for an exec of the specified process.
*/
void
-execsigs(p)
- register struct proc *p;
+execsigs(proc_t p, thread_t thread)
{
- register struct sigacts *ps = p->p_sigacts;
- register int nc, mask;
+ struct sigacts *ps = p->p_sigacts;
+ int nc, mask;
+ struct uthread *ut;
+
+ ut = (struct uthread *)get_bsdthread_info(thread);
+
+ /*
+ * transfer saved signal states from the process
+ * back to the current thread.
+ *
+ * NOTE: We do this without the process locked,
+ * because we are guaranteed to be single-threaded
+ * by this point in exec and the p_siglist is
+ * only accessed by threads inside the process.
+ */
+ ut->uu_siglist |= p->p_siglist;
+ p->p_siglist = 0;
/*
* Reset caught signals. Held signals remain held
if (sigprop[nc] & SA_IGNORE) {
if (nc != SIGCONT)
p->p_sigignore |= mask;
- p->p_siglist &= ~mask;
+ ut->uu_siglist &= ~mask;
}
ps->ps_sigact[nc] = SIG_DFL;
}
+
/*
* Reset stack state to the user stack.
* Clear set of signals caught on the signal stack.
*/
- ps->ps_sigstk.ss_flags = SA_DISABLE;
- ps->ps_sigstk.ss_size = 0;
- ps->ps_sigstk.ss_sp = 0;
- ps->ps_flags = 0;
+ /* thread */
+ ut->uu_sigstk.ss_flags = SA_DISABLE;
+ ut->uu_sigstk.ss_size = 0;
+ ut->uu_sigstk.ss_sp = USER_ADDR_NULL;
+ ut->uu_flag &= ~UT_ALTSTACK;
+ /* process */
+ ps->ps_sigonstack = 0;
}
/*
* and return old mask as return value;
* the library stub does the rest.
*/
-struct sigprocmask_args {
- int how;
- sigset_t mask;
-};
int
-sigprocmask(p, uap, retval)
- register struct proc *p;
- struct sigprocmask_args *uap;
- register_t *retval;
+sigprocmask(proc_t p, struct sigprocmask_args *uap, __unused int32_t *retval)
{
int error = 0;
+ sigset_t oldmask, nmask;
+ user_addr_t omask = uap->omask;
+ struct uthread *ut;
- *retval = p->p_sigmask;
+ ut = (struct uthread *)get_bsdthread_info(current_thread());
+ oldmask = ut->uu_sigmask;
+
+ if (uap->mask == USER_ADDR_NULL) {
+ /* just want old mask */
+ goto out;
+ }
+ error = copyin(uap->mask, &nmask, sizeof(sigset_t));
+ if (error)
+ goto out;
switch (uap->how) {
case SIG_BLOCK:
- p->p_sigmask |= uap->mask &~ sigcantmask;
+ block_procsigmask(p, (nmask & ~sigcantmask));
+ signal_setast(current_thread());
break;
case SIG_UNBLOCK:
- p->p_sigmask &= ~(uap->mask);
- signal_setast(current_act());
+ unblock_procsigmask(p, (nmask & ~sigcantmask));
+ signal_setast(current_thread());
break;
case SIG_SETMASK:
- p->p_sigmask = uap->mask &~ sigcantmask;
- signal_setast(current_act());
+ set_procsigmask(p, (nmask & ~sigcantmask));
+ signal_setast(current_thread());
break;
default:
error = EINVAL;
break;
}
+out:
+ if (!error && omask != USER_ADDR_NULL)
+ copyout(&oldmask, omask, sizeof(sigset_t));
return (error);
}
-/* ARGSUSED */
-int
-sigpending(p, uap, retval)
- struct proc *p;
- void *uap;
- register_t *retval;
-{
-
- *retval = p->p_siglist;
- return (0);
-}
-
-#if COMPAT_43
-/*
- * Generalized interface signal handler, 4.3-compatible.
- */
-struct osigvec_args {
- int signum;
- struct sigvec *nsv;
- struct sigvec *osv;
-};
-/* ARGSUSED */
-int
-osigvec(p, uap, retval)
- struct proc *p;
- register struct osigvec_args *uap;
- register_t *retval;
-{
- struct sigvec vec;
- register struct sigacts *ps = p->p_sigacts;
- register struct sigvec *sv;
- register int signum;
- int bit, error;
-
- signum = uap->signum;
- if (signum <= 0 || signum >= NSIG ||
- signum == SIGKILL || signum == SIGSTOP)
- return (EINVAL);
- sv = &vec;
- if (uap->osv) {
- *(sig_t *)&sv->sv_handler = ps->ps_sigact[signum];
- sv->sv_mask = ps->ps_catchmask[signum];
- bit = sigmask(signum);
- sv->sv_flags = 0;
- if ((ps->ps_sigonstack & bit) != 0)
- sv->sv_flags |= SV_ONSTACK;
- if ((ps->ps_sigintr & bit) != 0)
- sv->sv_flags |= SV_INTERRUPT;
- if (p->p_flag & P_NOCLDSTOP)
- sv->sv_flags |= SA_NOCLDSTOP;
- if (error = copyout((caddr_t)sv, (caddr_t)uap->osv,
- sizeof (vec)))
- return (error);
- }
- if (uap->nsv) {
- if (error = copyin((caddr_t)uap->nsv, (caddr_t)sv,
- sizeof (vec)))
- return (error);
- sv->sv_flags ^= SA_RESTART; /* opposite of SV_INTERRUPT */
- setsigvec(p, signum, (struct sigaction *)sv);
- }
- return (0);
-}
-
-struct osigblock_args {
- int mask;
-};
int
-osigblock(p, uap, retval)
- register struct proc *p;
- struct osigblock_args *uap;
- register_t *retval;
+sigpending(__unused proc_t p, struct sigpending_args *uap, __unused int32_t *retval)
{
+ struct uthread *ut;
+ sigset_t pendlist;
- *retval = p->p_sigmask;
- p->p_sigmask |= uap->mask &~ sigcantmask;
- return (0);
-}
-
-struct osigsetmask_args {
- int mask;
-};
-int
-osigsetmask(p, uap, retval)
- struct proc *p;
- struct osigsetmask_args *uap;
- register_t *retval;
-{
+ ut = (struct uthread *)get_bsdthread_info(current_thread());
+ pendlist = ut->uu_siglist;
- *retval = p->p_sigmask;
- p->p_sigmask = uap->mask &~ sigcantmask;
- return (0);
+ if (uap->osv)
+ copyout(&pendlist, uap->osv, sizeof(sigset_t));
+ return(0);
}
-#endif /* COMPAT_43 */
/*
* Suspend process until signal, providing mask to be set
* libc stub passes mask, not pointer, to save a copyin.
*/
-int
-sigcontinue(error)
+static int
+sigcontinue(__unused int error)
{
- unix_syscall_return(EINTR);
+// struct uthread *ut = get_bsdthread_info(current_thread());
+ unix_syscall_return(EINTR);
}
-struct sigsuspend_args {
- int mask;
-};
+int
+sigsuspend(proc_t p, struct sigsuspend_args *uap, int32_t *retval)
+{
+ __pthread_testcancel(1);
+ return(sigsuspend_nocancel(p, (struct sigsuspend_nocancel_args *)uap, retval));
+}
-/* ARGSUSED */
int
-sigsuspend(p, uap, retval)
- register struct proc *p;
- struct sigsuspend_args *uap;
- register_t *retval;
+sigsuspend_nocancel(proc_t p, struct sigsuspend_nocancel_args *uap, __unused int32_t *retval)
{
- register struct sigacts *ps = p->p_sigacts;
+ struct uthread *ut;
+
+ ut = (struct uthread *)get_bsdthread_info(current_thread());
/*
* When returning from sigpause, we want
* save it here and mark the sigacts structure
* to indicate this.
*/
- ps->ps_oldmask = p->p_sigmask;
- ps->ps_flags |= SAS_OLDMASK;
- p->p_sigmask = uap->mask &~ sigcantmask;
+ ut->uu_oldmask = ut->uu_sigmask;
+ ut->uu_flag |= UT_SAS_OLDMASK;
+ ut->uu_sigmask = (uap->mask & ~sigcantmask);
(void) tsleep0((caddr_t) p, PPAUSE|PCATCH, "pause", 0, sigcontinue);
/* always return EINTR rather than ERESTART... */
return (EINTR);
}
-#if COMPAT_43
-struct osigstack_args {
- struct sigstack *nss;
- struct sigstack *oss;
-};
-/* ARGSUSED */
+
int
-osigstack(p, uap, retval)
- struct proc *p;
- register struct osigstack_args *uap;
- register_t *retval;
+__disable_threadsignal(__unused proc_t p,
+ __unused struct __disable_threadsignal_args *uap,
+ __unused int32_t *retval)
{
- struct sigstack ss;
- struct sigacts *psp;
- int error = 0;
+ struct uthread *uth;
- psp = p->p_sigacts;
- ss.ss_sp = psp->ps_sigstk.ss_sp;
- ss.ss_onstack = psp->ps_sigstk.ss_flags & SA_ONSTACK;
- if (uap->oss && (error = copyout((caddr_t)&ss,
- (caddr_t)uap->oss, sizeof (struct sigstack))))
- return (error);
- if (uap->nss && (error = copyin((caddr_t)uap->nss,
- (caddr_t)&ss, sizeof (ss))) == 0) {
- psp->ps_sigstk.ss_sp = ss.ss_sp;
- psp->ps_sigstk.ss_size = 0;
- psp->ps_sigstk.ss_flags |= ss.ss_onstack & SA_ONSTACK;
- psp->ps_flags |= SAS_ALTSTACK;
+ uth = (struct uthread *)get_bsdthread_info(current_thread());
+
+ /* No longer valid to have any signal delivered */
+ uth->uu_flag |= (UT_NO_SIGMASK | UT_CANCELDISABLE);
+
+ return(0);
+
+}
+
+void
+__pthread_testcancel(int presyscall)
+{
+
+ thread_t self = current_thread();
+ struct uthread * uthread;
+
+ uthread = (struct uthread *)get_bsdthread_info(self);
+
+
+ uthread->uu_flag &= ~UT_NOTCANCELPT;
+
+ if ((uthread->uu_flag & (UT_CANCELDISABLE | UT_CANCEL | UT_CANCELED)) == UT_CANCEL) {
+ if(presyscall != 0) {
+ unix_syscall_return(EINTR);
+ /* NOTREACHED */
+ } else
+ thread_abort_safely(self);
}
- return (error);
}
-#endif /* COMPAT_43 */
-struct sigaltstack_args {
- struct sigaltstack *nss;
- struct sigaltstack *oss;
-};
-/* ARGSUSED */
+
+
int
-sigaltstack(p, uap, retval)
- struct proc *p;
- register struct sigaltstack_args *uap;
- register_t *retval;
+__pthread_markcancel(__unused proc_t p,
+ struct __pthread_markcancel_args *uap, __unused int32_t *retval)
{
- struct sigacts *psp;
- struct sigaltstack ss;
- int error;
+ thread_act_t target_act;
+ int error = 0;
+ struct uthread *uth;
- psp = p->p_sigacts;
- if ((psp->ps_flags & SAS_ALTSTACK) == 0)
- psp->ps_sigstk.ss_flags |= SA_DISABLE;
- if (uap->oss && (error = copyout((caddr_t)&psp->ps_sigstk,
- (caddr_t)uap->oss, sizeof (struct sigaltstack))))
- return (error);
- if (uap->nss == 0)
- return (0);
- if (error = copyin((caddr_t)uap->nss, (caddr_t)&ss,
- sizeof (ss)))
- return (error);
- if (ss.ss_flags & SA_DISABLE) {
- if (psp->ps_sigstk.ss_flags & SA_ONSTACK)
- return (EINVAL);
- psp->ps_flags &= ~SAS_ALTSTACK;
- psp->ps_sigstk.ss_flags = ss.ss_flags;
- return (0);
+ target_act = (thread_act_t)port_name_to_thread(uap->thread_port);
+
+ if (target_act == THR_ACT_NULL)
+ return (ESRCH);
+
+ uth = (struct uthread *)get_bsdthread_info(target_act);
+
+ /* if the thread is in vfork do not cancel */
+ if ((uth->uu_flag & (UT_VFORK | UT_CANCEL | UT_CANCELED )) == 0) {
+ uth->uu_flag |= (UT_CANCEL | UT_NO_SIGMASK);
+ if (((uth->uu_flag & UT_NOTCANCELPT) == 0)
+ && ((uth->uu_flag & UT_CANCELDISABLE) == 0))
+ thread_abort_safely(target_act);
}
- if (ss.ss_size < MINSIGSTKSZ)
- return (ENOMEM);
- psp->ps_flags |= SAS_ALTSTACK;
- psp->ps_sigstk= ss;
- return (0);
+
+ thread_deallocate(target_act);
+ return (error);
}
-struct kill_args {
- int pid;
- int signum;
-};
-/* ARGSUSED */
+/* if action =0 ; return the cancellation state ,
+ * if marked for cancellation, make the thread canceled
+ * if action = 1 ; Enable the cancel handling
+ * if action = 2; Disable the cancel handling
+ */
int
-kill(cp, uap, retval)
- register struct proc *cp;
- register struct kill_args *uap;
- register_t *retval;
+__pthread_canceled(__unused proc_t p,
+ struct __pthread_canceled_args *uap, __unused int32_t *retval)
{
- register struct proc *p;
- register struct pcred *pc = cp->p_cred;
+ thread_act_t thread;
+ struct uthread *uth;
+ int action = uap->action;
- if ((u_int)uap->signum >= NSIG)
- return (EINVAL);
- if (uap->pid > 0) {
- /* kill single process */
- if ((p = pfind(uap->pid)) == NULL)
- return (ESRCH);
- if (!cansignal(cp, pc, p, uap->signum))
- return (EPERM);
- if (uap->signum)
- psignal(p, uap->signum);
- return (0);
+ thread = current_thread();
+ uth = (struct uthread *)get_bsdthread_info(thread);
+
+ switch (action) {
+ case 1:
+ uth->uu_flag &= ~UT_CANCELDISABLE;
+ return(0);
+ case 2:
+ uth->uu_flag |= UT_CANCELDISABLE;
+ return(0);
+ case 0:
+ default:
+ /* if the thread is in vfork do not cancel */
+ if((uth->uu_flag & ( UT_CANCELDISABLE | UT_CANCEL | UT_CANCELED)) == UT_CANCEL) {
+ uth->uu_flag &= ~UT_CANCEL;
+ uth->uu_flag |= (UT_CANCELED | UT_NO_SIGMASK);
+ return(0);
+ }
+ return(EINVAL);
+ }
+ return(EINVAL);
+}
+
+void
+__posix_sem_syscall_return(kern_return_t kern_result)
+{
+ int error = 0;
+
+ if (kern_result == KERN_SUCCESS)
+ error = 0;
+ else if (kern_result == KERN_ABORTED)
+ error = EINTR;
+ else if (kern_result == KERN_OPERATION_TIMED_OUT)
+ error = ETIMEDOUT;
+ else
+ error = EINVAL;
+ unix_syscall_return(error);
+ /* does not return */
+}
+
+#if OLD_SEMWAIT_SIGNAL
+/*
+ * Returns: 0 Success
+ * EINTR
+ * ETIMEDOUT
+ * EINVAL
+ * EFAULT if timespec is NULL
+ */
+int
+__old_semwait_signal(proc_t p, struct __old_semwait_signal_args *uap,
+ int32_t *retval)
+{
+ __pthread_testcancel(0);
+ return(__old_semwait_signal_nocancel(p, (struct __old_semwait_signal_nocancel_args *)uap, retval));
+}
+
+int
+__old_semwait_signal_nocancel(proc_t p, struct __old_semwait_signal_nocancel_args *uap,
+ __unused int32_t *retval)
+{
+
+ kern_return_t kern_result;
+ int error;
+ mach_timespec_t then;
+ struct timespec now;
+ struct user_timespec ts;
+ boolean_t truncated_timeout = FALSE;
+
+ if(uap->timeout) {
+
+ if (IS_64BIT_PROCESS(p)) {
+ struct user64_timespec ts64;
+ error = copyin(uap->ts, &ts64, sizeof(ts64));
+ ts.tv_sec = ts64.tv_sec;
+ ts.tv_nsec = ts64.tv_nsec;
+ } else {
+ struct user32_timespec ts32;
+ error = copyin(uap->ts, &ts32, sizeof(ts32));
+ ts.tv_sec = ts32.tv_sec;
+ ts.tv_nsec = ts32.tv_nsec;
+ }
+
+ if (error) {
+ return error;
+ }
+
+ if ((ts.tv_sec & 0xFFFFFFFF00000000ULL) != 0) {
+ ts.tv_sec = 0xFFFFFFFF;
+ ts.tv_nsec = 0;
+ truncated_timeout = TRUE;
+ }
+
+ if (uap->relative) {
+ then.tv_sec = ts.tv_sec;
+ then.tv_nsec = ts.tv_nsec;
+ } else {
+ nanotime(&now);
+
+ /* if time has elapsed, set time to null timepsec to bailout rightaway */
+ if (now.tv_sec == ts.tv_sec ?
+ now.tv_nsec > ts.tv_nsec :
+ now.tv_sec > ts.tv_sec) {
+ then.tv_sec = 0;
+ then.tv_nsec = 0;
+ } else {
+ then.tv_sec = ts.tv_sec - now.tv_sec;
+ then.tv_nsec = ts.tv_nsec - now.tv_nsec;
+ if (then.tv_nsec < 0) {
+ then.tv_nsec += NSEC_PER_SEC;
+ then.tv_sec--;
+ }
+ }
+ }
+
+ if (uap->mutex_sem == 0)
+ kern_result = semaphore_timedwait_trap_internal((mach_port_name_t)uap->cond_sem, then.tv_sec, then.tv_nsec, __posix_sem_syscall_return);
+ else
+ kern_result = semaphore_timedwait_signal_trap_internal(uap->cond_sem, uap->mutex_sem, then.tv_sec, then.tv_nsec, __posix_sem_syscall_return);
+
+ } else {
+
+ if (uap->mutex_sem == 0)
+ kern_result = semaphore_wait_trap_internal(uap->cond_sem, __posix_sem_syscall_return);
+ else
+
+ kern_result = semaphore_wait_signal_trap_internal(uap->cond_sem, uap->mutex_sem, __posix_sem_syscall_return);
+ }
+
+ if (kern_result == KERN_SUCCESS && !truncated_timeout)
+ return(0);
+ else if (kern_result == KERN_SUCCESS && truncated_timeout)
+ return(EINTR); /* simulate an exceptional condition because Mach doesn't support a longer timeout */
+ else if (kern_result == KERN_ABORTED)
+ return(EINTR);
+ else if (kern_result == KERN_OPERATION_TIMED_OUT)
+ return(ETIMEDOUT);
+ else
+ return(EINVAL);
+}
+#endif /* OLD_SEMWAIT_SIGNAL*/
+
+/*
+ * Returns: 0 Success
+ * EINTR
+ * ETIMEDOUT
+ * EINVAL
+ * EFAULT if timespec is NULL
+ */
+int
+__semwait_signal(proc_t p, struct __semwait_signal_args *uap,
+ int32_t *retval)
+{
+ __pthread_testcancel(0);
+ return(__semwait_signal_nocancel(p, (struct __semwait_signal_nocancel_args *)uap, retval));
+}
+
+int
+__semwait_signal_nocancel(__unused proc_t p, struct __semwait_signal_nocancel_args *uap,
+ __unused int32_t *retval)
+{
+
+ kern_return_t kern_result;
+ mach_timespec_t then;
+ struct timespec now;
+ struct user_timespec ts;
+ boolean_t truncated_timeout = FALSE;
+
+ if(uap->timeout) {
+
+ ts.tv_sec = uap->tv_sec;
+ ts.tv_nsec = uap->tv_nsec;
+
+ if ((ts.tv_sec & 0xFFFFFFFF00000000ULL) != 0) {
+ ts.tv_sec = 0xFFFFFFFF;
+ ts.tv_nsec = 0;
+ truncated_timeout = TRUE;
+ }
+
+ if (uap->relative) {
+ then.tv_sec = ts.tv_sec;
+ then.tv_nsec = ts.tv_nsec;
+ } else {
+ nanotime(&now);
+
+ /* if time has elapsed, set time to null timepsec to bailout rightaway */
+ if (now.tv_sec == ts.tv_sec ?
+ now.tv_nsec > ts.tv_nsec :
+ now.tv_sec > ts.tv_sec) {
+ then.tv_sec = 0;
+ then.tv_nsec = 0;
+ } else {
+ then.tv_sec = ts.tv_sec - now.tv_sec;
+ then.tv_nsec = ts.tv_nsec - now.tv_nsec;
+ if (then.tv_nsec < 0) {
+ then.tv_nsec += NSEC_PER_SEC;
+ then.tv_sec--;
+ }
+ }
+ }
+
+ if (uap->mutex_sem == 0)
+ kern_result = semaphore_timedwait_trap_internal((mach_port_name_t)uap->cond_sem, then.tv_sec, then.tv_nsec, __posix_sem_syscall_return);
+ else
+ kern_result = semaphore_timedwait_signal_trap_internal(uap->cond_sem, uap->mutex_sem, then.tv_sec, then.tv_nsec, __posix_sem_syscall_return);
+
+ } else {
+
+ if (uap->mutex_sem == 0)
+ kern_result = semaphore_wait_trap_internal(uap->cond_sem, __posix_sem_syscall_return);
+ else
+
+ kern_result = semaphore_wait_signal_trap_internal(uap->cond_sem, uap->mutex_sem, __posix_sem_syscall_return);
+ }
+
+ if (kern_result == KERN_SUCCESS && !truncated_timeout)
+ return(0);
+ else if (kern_result == KERN_SUCCESS && truncated_timeout)
+ return(EINTR); /* simulate an exceptional condition because Mach doesn't support a longer timeout */
+ else if (kern_result == KERN_ABORTED)
+ return(EINTR);
+ else if (kern_result == KERN_OPERATION_TIMED_OUT)
+ return(ETIMEDOUT);
+ else
+ return(EINVAL);
+}
+
+
+int
+__pthread_kill(__unused proc_t p, struct __pthread_kill_args *uap,
+ __unused int32_t *retval)
+{
+ thread_t target_act;
+ int error = 0;
+ int signum = uap->sig;
+ struct uthread *uth;
+
+ target_act = (thread_t)port_name_to_thread(uap->thread_port);
+
+ if (target_act == THREAD_NULL)
+ return (ESRCH);
+ if ((u_int)signum >= NSIG) {
+ error = EINVAL;
+ goto out;
+ }
+
+ uth = (struct uthread *)get_bsdthread_info(target_act);
+
+ if (uth->uu_flag & UT_NO_SIGMASK) {
+ error = ESRCH;
+ goto out;
+ }
+
+ if (signum)
+ psignal_uthread(target_act, signum);
+out:
+ thread_deallocate(target_act);
+ return (error);
+}
+
+
+int
+__pthread_sigmask(__unused proc_t p, struct __pthread_sigmask_args *uap,
+ __unused int32_t *retval)
+{
+ user_addr_t set = uap->set;
+ user_addr_t oset = uap->oset;
+ sigset_t nset;
+ int error = 0;
+ struct uthread *ut;
+ sigset_t oldset;
+
+ ut = (struct uthread *)get_bsdthread_info(current_thread());
+ oldset = ut->uu_sigmask;
+
+ if (set == USER_ADDR_NULL) {
+ /* need only old mask */
+ goto out;
+ }
+
+ error = copyin(set, &nset, sizeof(sigset_t));
+ if (error)
+ goto out;
+
+ switch (uap->how) {
+ case SIG_BLOCK:
+ ut->uu_sigmask |= (nset & ~sigcantmask);
+ break;
+
+ case SIG_UNBLOCK:
+ ut->uu_sigmask &= ~(nset);
+ signal_setast(current_thread());
+ break;
+
+ case SIG_SETMASK:
+ ut->uu_sigmask = (nset & ~sigcantmask);
+ signal_setast(current_thread());
+ break;
+
+ default:
+ error = EINVAL;
+
+ }
+out:
+ if (!error && oset != USER_ADDR_NULL)
+ copyout(&oldset, oset, sizeof(sigset_t));
+
+ return(error);
+}
+
+/*
+ * Returns: 0 Success
+ * EINVAL
+ * copyin:EFAULT
+ * copyout:EFAULT
+ */
+int
+__sigwait(proc_t p, struct __sigwait_args *uap, int32_t *retval)
+{
+ __pthread_testcancel(1);
+ return(__sigwait_nocancel(p, (struct __sigwait_nocancel_args *)uap, retval));
+}
+
+int
+__sigwait_nocancel(proc_t p, struct __sigwait_nocancel_args *uap, __unused int32_t *retval)
+{
+ struct uthread *ut;
+ struct uthread *uth;
+ int error = 0;
+ sigset_t mask;
+ sigset_t siglist;
+ sigset_t sigw=0;
+ int signum;
+
+ ut = (struct uthread *)get_bsdthread_info(current_thread());
+
+ if (uap->set == USER_ADDR_NULL)
+ return(EINVAL);
+
+ error = copyin(uap->set, &mask, sizeof(sigset_t));
+ if (error)
+ return(error);
+
+ siglist = (mask & ~sigcantmask);
+
+ if (siglist == 0)
+ return(EINVAL);
+
+ proc_lock(p);
+ if ((p->p_lflag & P_LINVFORK) && p->p_vforkact) {
+ proc_unlock(p);
+ return(EINVAL);
+ } else {
+ proc_signalstart(p, 1);
+ TAILQ_FOREACH(uth, &p->p_uthlist, uu_list) {
+ if ( (sigw = uth->uu_siglist & siglist) ) {
+ break;
+ }
+ }
+ proc_signalend(p, 1);
+ }
+
+ if (sigw) {
+ /* The signal was pending on a thread */
+ goto sigwait1;
+ }
+ /*
+ * When returning from sigwait, we want
+ * the old mask to be restored after the
+ * signal handler has finished. Thus, we
+ * save it here and mark the sigacts structure
+ * to indicate this.
+ */
+ uth = ut; /* wait for it to be delivered to us */
+ ut->uu_oldmask = ut->uu_sigmask;
+ ut->uu_flag |= UT_SAS_OLDMASK;
+ if (siglist == (sigset_t)0) {
+ proc_unlock(p);
+ return(EINVAL);
+ }
+ /* SIGKILL and SIGSTOP are not maskable as well */
+ ut->uu_sigmask = ~(siglist|sigcantmask);
+ ut->uu_sigwait = siglist;
+
+ /* No Continuations for now */
+ error = msleep((caddr_t)&ut->uu_sigwait, &p->p_mlock, PPAUSE|PCATCH, "pause", 0);
+
+ if (error == ERESTART)
+ error = 0;
+
+ sigw = (ut->uu_sigwait & siglist);
+ ut->uu_sigmask = ut->uu_oldmask;
+ ut->uu_oldmask = 0;
+ ut->uu_flag &= ~UT_SAS_OLDMASK;
+sigwait1:
+ ut->uu_sigwait = 0;
+ if (!error) {
+ signum = ffs((unsigned int)sigw);
+ if (!signum)
+ panic("sigwait with no signal wakeup");
+ /* Clear the pending signal in the thread it was delivered */
+ uth->uu_siglist &= ~(sigmask(signum));
+
+#if CONFIG_DTRACE
+ DTRACE_PROC2(signal__clear, int, signum, siginfo_t *, &(ut->t_dtrace_siginfo));
+#endif
+
+ proc_unlock(p);
+ if (uap->sig != USER_ADDR_NULL)
+ error = copyout(&signum, uap->sig, sizeof(int));
+ } else
+ proc_unlock(p);
+
+ return(error);
+
+}
+
+int
+sigaltstack(__unused proc_t p, struct sigaltstack_args *uap, __unused int32_t *retval)
+{
+ struct kern_sigaltstack ss;
+ struct kern_sigaltstack *pstk;
+ int error;
+ struct uthread *uth;
+ int onstack;
+
+ uth = (struct uthread *)get_bsdthread_info(current_thread());
+
+ pstk = &uth->uu_sigstk;
+ if ((uth->uu_flag & UT_ALTSTACK) == 0)
+ uth->uu_sigstk.ss_flags |= SA_DISABLE;
+ onstack = pstk->ss_flags & SA_ONSTACK;
+ if (uap->oss) {
+ if (IS_64BIT_PROCESS(p)) {
+ struct user64_sigaltstack ss64;
+ sigaltstack_kern_to_user64(pstk, &ss64);
+ error = copyout(&ss64, uap->oss, sizeof(ss64));
+ } else {
+ struct user32_sigaltstack ss32;
+ sigaltstack_kern_to_user32(pstk, &ss32);
+ error = copyout(&ss32, uap->oss, sizeof(ss32));
+ }
+ if (error)
+ return (error);
+ }
+ if (uap->nss == USER_ADDR_NULL)
+ return (0);
+ if (IS_64BIT_PROCESS(p)) {
+ struct user64_sigaltstack ss64;
+ error = copyin(uap->nss, &ss64, sizeof(ss64));
+ sigaltstack_user64_to_kern(&ss64, &ss);
+ } else {
+ struct user32_sigaltstack ss32;
+ error = copyin(uap->nss, &ss32, sizeof(ss32));
+ sigaltstack_user32_to_kern(&ss32, &ss);
+ }
+ if (error)
+ return (error);
+ if ((ss.ss_flags & ~SA_DISABLE) != 0) {
+ return(EINVAL);
+ }
+
+ if (ss.ss_flags & SA_DISABLE) {
+ /* if we are here we are not in the signal handler ;so no need to check */
+ if (uth->uu_sigstk.ss_flags & SA_ONSTACK)
+ return (EINVAL);
+ uth->uu_flag &= ~UT_ALTSTACK;
+ uth->uu_sigstk.ss_flags = ss.ss_flags;
+ return (0);
+ }
+ if (onstack)
+ return (EPERM);
+/* The older stacksize was 8K, enforce that one so no compat problems */
+#define OLDMINSIGSTKSZ 8*1024
+ if (ss.ss_size < OLDMINSIGSTKSZ)
+ return (ENOMEM);
+ uth->uu_flag |= UT_ALTSTACK;
+ uth->uu_sigstk= ss;
+ return (0);
+}
+
+int
+kill(proc_t cp, struct kill_args *uap, __unused int32_t *retval)
+{
+ proc_t p;
+ kauth_cred_t uc = kauth_cred_get();
+ int posix = uap->posix; /* !0 if posix behaviour desired */
+
+ AUDIT_ARG(pid, uap->pid);
+ AUDIT_ARG(signum, uap->signum);
+
+ if ((u_int)uap->signum >= NSIG)
+ return (EINVAL);
+ if (uap->pid > 0) {
+ /* kill single process */
+ if ((p = proc_find(uap->pid)) == NULL) {
+ if ((p = pzfind(uap->pid)) != NULL) {
+ /*
+ * IEEE Std 1003.1-2001: return success
+ * when killing a zombie.
+ */
+ return (0);
+ }
+ return (ESRCH);
+ }
+ AUDIT_ARG(process, p);
+ if (!cansignal(cp, uc, p, uap->signum, 0)) {
+ proc_rele(p);
+ return(EPERM);
+ }
+ if (uap->signum)
+ psignal(p, uap->signum);
+ proc_rele(p);
+ return (0);
}
switch (uap->pid) {
case -1: /* broadcast signal */
- return (killpg1(cp, uap->signum, 0, 1));
+ return (killpg1(cp, uap->signum, 0, 1, posix));
case 0: /* signal own process group */
- return (killpg1(cp, uap->signum, 0, 0));
+ return (killpg1(cp, uap->signum, 0, 0, posix));
default: /* negative explicit process group */
- return (killpg1(cp, uap->signum, -(uap->pid), 0));
+ return (killpg1(cp, uap->signum, -(uap->pid), 0, posix));
}
/* NOTREACHED */
}
-#if COMPAT_43
-struct okillpg_args {
- int pgid;
- int signum;
-};
-/* ARGSUSED */
-int
-okillpg(p, uap, retval)
- struct proc *p;
- register struct okillpg_args *uap;
- register_t *retval;
+static int
+killpg1_filt(proc_t p, void * arg)
{
+ struct killpg1_filtargs * kfargp = (struct killpg1_filtargs *)arg;
+ proc_t cp = kfargp->cp;
+ int posix = kfargp->posix;
- if ((u_int)uap->signum >= NSIG)
- return (EINVAL);
- return (killpg1(p, uap->signum, uap->pgid, 0));
+
+ if (p->p_pid <= 1 || p->p_flag & P_SYSTEM ||
+ (!posix && p == cp))
+ return(0);
+ else
+ return(1);
+}
+
+
+static int
+killpg1_pgrpfilt(proc_t p, __unused void * arg)
+{
+ if (p->p_pid <= 1 || p->p_flag & P_SYSTEM ||
+ (p->p_stat == SZOMB))
+ return(0);
+ else
+ return(1);
+}
+
+
+
+static int
+killpg1_callback(proc_t p, void * arg)
+{
+ struct killpg1_iterargs * kargp = (struct killpg1_iterargs *)arg;
+ proc_t cp = kargp->cp;
+ kauth_cred_t uc = kargp->uc; /* refcounted by the caller safe to use internal fields */
+ int signum = kargp->signum;
+ int * nfoundp = kargp->nfoundp;
+ int n;
+ int zombie = 0;
+ int error = 0;
+
+ if ((kargp->zombie != 0) && ((p->p_listflag & P_LIST_EXITED) == P_LIST_EXITED))
+ zombie = 1;
+
+ if (zombie != 0) {
+ proc_list_lock();
+ error = cansignal(cp, uc, p, signum, zombie);
+ proc_list_unlock();
+
+ if (error != 0 && nfoundp != NULL) {
+ n = *nfoundp;
+ *nfoundp = n+1;
+ }
+ } else {
+ if (cansignal(cp, uc, p, signum, 0) == 0)
+ return(PROC_RETURNED);
+
+ if (nfoundp != NULL) {
+ n = *nfoundp;
+ *nfoundp = n+1;
+ }
+ if (signum != 0)
+ psignal(p, signum);
+ }
+
+ return(PROC_RETURNED);
}
-#endif /* COMPAT_43 */
/*
* Common code for kill process group/broadcast kill.
* cp is calling process.
*/
int
-killpg1(cp, signum, pgid, all)
- register struct proc *cp;
- int signum, pgid, all;
+killpg1(proc_t cp, int signum, int pgid, int all, int posix)
{
- register struct proc *p;
- register struct pcred *pc = cp->p_cred;
+ kauth_cred_t uc;
struct pgrp *pgrp;
int nfound = 0;
+ struct killpg1_iterargs karg;
+ struct killpg1_filtargs kfarg;
+ int error = 0;
+ uc = kauth_cred_proc_ref(cp);
if (all) {
/*
* broadcast
*/
- for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) {
- if (p->p_pid <= 1 || p->p_flag & P_SYSTEM ||
- p == cp || !cansignal(cp, pc, p, signum))
- continue;
- nfound++;
- if (signum)
- psignal(p, signum);
- }
+ kfarg.posix = posix;
+ kfarg.cp = cp;
+
+ karg.cp = cp;
+ karg.uc = uc;
+ karg.nfoundp = &nfound;
+ karg.signum = signum;
+ karg.zombie = 1;
+
+ proc_iterate((PROC_ALLPROCLIST | PROC_ZOMBPROCLIST), killpg1_callback, &karg, killpg1_filt, (void *)&kfarg);
+
} else {
- if (pgid == 0)
+ if (pgid == 0) {
/*
* zero pgid means send to my process group.
*/
- pgrp = cp->p_pgrp;
- else {
+ pgrp = proc_pgrp(cp);
+ } else {
pgrp = pgfind(pgid);
- if (pgrp == NULL)
- return (ESRCH);
- }
- for (p = pgrp->pg_members.lh_first; p != 0;
- p = p->p_pglist.le_next) {
- if (p->p_pid <= 1 || p->p_flag & P_SYSTEM ||
- p->p_stat == SZOMB ||
- !cansignal(cp, pc, p, signum))
- continue;
- nfound++;
- if (signum)
- psignal(p, signum);
+ if (pgrp == NULL) {
+ error = ESRCH;
+ goto out;
+ }
}
+
+ karg.nfoundp = &nfound;
+ karg.uc = uc;
+ karg.signum = signum;
+ karg.cp = cp;
+ karg.zombie = 0;
+
+
+ /* PGRP_DROPREF drops the pgrp refernce */
+ pgrp_iterate(pgrp, PGRP_BLOCKITERATE | PGRP_DROPREF, killpg1_callback, &karg,
+ killpg1_pgrpfilt, NULL);
}
- return (nfound ? 0 : ESRCH);
+ error = (nfound ? 0 : (posix ? EPERM : ESRCH));
+out:
+ kauth_cred_unref(&uc);
+ return (error);
}
+
/*
* Send a signal to a process group.
*/
void
-gsignal(pgid, signum)
- int pgid, signum;
+gsignal(int pgid, int signum)
{
struct pgrp *pgrp;
- if (pgid && (pgrp = pgfind(pgid)))
+ if (pgid && (pgrp = pgfind(pgid))) {
pgsignal(pgrp, signum, 0);
+ pg_rele(pgrp);
+ }
}
/*
- * Send a signal to a process group. If checktty is 1,
+ * Send a signal to a process group. If checkctty is 1,
* limit to members which have a controlling terminal.
*/
-void
-pgsignal(pgrp, signum, checkctty)
- struct pgrp *pgrp;
- int signum, checkctty;
+
+static int
+pgsignal_filt(proc_t p, void * arg)
+{
+ int checkctty = *(int*)arg;
+
+ if ((checkctty == 0) || p->p_flag & P_CONTROLT)
+ return(1);
+ else
+ return(0);
+}
+
+
+static int
+pgsignal_callback(proc_t p, void * arg)
{
- register struct proc *p;
+ int signum = *(int*)arg;
+
+ psignal(p, signum);
+ return(PROC_RETURNED);
+}
+
- if (pgrp)
- for (p = pgrp->pg_members.lh_first; p != 0;
- p = p->p_pglist.le_next)
- if (checkctty == 0 || p->p_flag & P_CONTROLT)
- psignal(p, signum);
+void
+pgsignal(struct pgrp *pgrp, int signum, int checkctty)
+{
+ if (pgrp != PGRP_NULL) {
+ pgrp_iterate(pgrp, PGRP_BLOCKITERATE, pgsignal_callback, &signum, pgsignal_filt, &checkctty);
+ }
}
+
+void
+tty_pgsignal(struct tty *tp, int signum, int checkctty)
+{
+ struct pgrp * pg;
+
+ pg = tty_pgrp(tp);
+ if (pg != PGRP_NULL) {
+ pgrp_iterate(pg, PGRP_BLOCKITERATE, pgsignal_callback, &signum, pgsignal_filt, &checkctty);
+ pg_rele(pg);
+ }
+}
/*
* Send a signal caused by a trap to a specific thread.
*/
void
-threadsignal(sig_actthread, signum, code)
- register thread_act_t *sig_actthread;
- register int signum;
- u_long code;
-{
- register struct uthread *uth;
- register struct task * sig_task;
- register struct proc *p ;
+threadsignal(thread_t sig_actthread, int signum, mach_exception_code_t code)
+{
+ struct uthread *uth;
+ struct task * sig_task;
+ proc_t p;
int mask;
if ((u_int)signum >= NSIG || signum == 0)
if ((mask & threadmask) == 0)
return;
sig_task = get_threadtask(sig_actthread);
- /* p = sig_task->proc; */
- p = (struct proc *)(get_bsdtask_info(sig_task));
+ p = (proc_t)(get_bsdtask_info(sig_task));
+
+ uth = get_bsdthread_info(sig_actthread);
+ if (uth->uu_flag & UT_VFORK)
+ p = uth->uu_proc;
- if (!(p->p_flag & P_TRACED) && (p->p_sigignore & mask))
+ proc_lock(p);
+ if (!(p->p_lflag & P_LTRACED) && (p->p_sigignore & mask)) {
+ proc_unlock(p);
return;
+ }
- uth = get_bsdthread_info(sig_actthread);
- uth->uu_sig |= mask;
+ uth->uu_siglist |= mask;
uth->uu_code = code;
+ proc_unlock(p);
+
/* mark on process as well */
- p->p_siglist |= mask;
signal_setast(sig_actthread);
}
-
-void
-psignal_pend(p)
- register struct proc *p;
+static kern_return_t
+get_signalthread(proc_t p, int signum, thread_t * thr)
{
- boolean_t funnel_state;
- register int sigbits, mask, signum;
-
- thread_funnel_set(kernel_flock, TRUE);
-
- if (p->p_sigpending == 0)
- return;
+ struct uthread *uth;
+ sigset_t mask = sigmask(signum);
+ thread_t sig_thread;
+ struct task * sig_task = p->task;
+ kern_return_t kret;
-
- signal_lock(p);
-
- for (;;) {
- sigbits = p->p_sigpending;
- if (sigbits == 0)
- goto out;
- signum = ffs((long)sigbits);
- mask = sigmask(signum);
- p->p_sigpending &= ~mask;
-
- psignal_lock(p, signum, 0, 0);
-
+ *thr = THREAD_NULL;
+
+ if ((p->p_lflag & P_LINVFORK) && p->p_vforkact) {
+ sig_thread = p->p_vforkact;
+ kret = check_actforsig(sig_task, sig_thread, 1);
+ if (kret == KERN_SUCCESS) {
+ *thr = sig_thread;
+ return(KERN_SUCCESS);
+ }else
+ return(KERN_FAILURE);
+ }
+
+ proc_lock(p);
+ TAILQ_FOREACH(uth, &p->p_uthlist, uu_list) {
+ if(((uth->uu_flag & UT_NO_SIGMASK)== 0) &&
+ (((uth->uu_sigmask & mask) == 0) || (uth->uu_sigwait & mask))) {
+ if (check_actforsig(p->task, uth->uu_context.vc_thread, 1) == KERN_SUCCESS) {
+ *thr = uth->uu_context.vc_thread;
+ proc_unlock(p);
+ return(KERN_SUCCESS);
+ }
+ }
+ }
+ proc_unlock(p);
+ if (get_signalact(p->task, thr, 1) == KERN_SUCCESS) {
+ return(KERN_SUCCESS);
}
-out:
- p->p_flag &= ~P_SIGTHR;
- signal_unlock(p);
- thread_funnel_set(kernel_flock, FALSE);
-}
-void
-psignal(p, signum)
- register struct proc *p;
- register int signum;
-{
- psignal_lock(p, signum, 1, 1);
+ return(KERN_FAILURE);
}
-
/*
* Send the signal to the process. If the signal has an action, the action
* is usually performed by the target process rather than the caller; we add
*
* Other ignored signals are discarded immediately.
*/
-void
-psignal_lock(p, signum, withlock, pend)
- register struct proc *p;
- register int signum;
- register int withlock;
- register int pend;
-{
- register int s, prop;
- register sig_t action;
- thread_act_t sig_thread_act;
+static void
+psignal_internal(proc_t p, task_t task, thread_t thread, int flavor, int signum)
+{
+ int prop;
+ user_addr_t action = USER_ADDR_NULL;
+ proc_t sig_proc;
thread_t sig_thread;
register task_t sig_task;
- register thread_t cur_thread;
- thread_act_t *cur_act;
int mask;
+ struct uthread *uth;
kern_return_t kret;
+ uid_t r_uid;
+ proc_t pp;
+ kauth_cred_t my_cred;
if ((u_int)signum >= NSIG || signum == 0)
panic("psignal signal number");
prop = sigprop[signum];
#if SIGNAL_DEBUG
- if(rdebug_proc && (p == rdebug_proc)) {
+ if(rdebug_proc && (p != PROC_NULL) && (p == rdebug_proc)) {
ram_printf(3);
}
#endif /* SIGNAL_DEBUG */
+
/*
* We will need the task pointer later. Grab it now to
* check for a zombie process. Also don't send signals
* to kernel internal tasks.
*/
- if (((sig_task = p->task) == TASK_NULL) || is_kerneltask(sig_task))
+ if (flavor & PSIG_VFORK) {
+ sig_task = task;
+ sig_thread = thread;
+ sig_proc = p;
+ } else if (flavor & PSIG_THREAD) {
+ sig_task = get_threadtask(thread);
+ sig_thread = thread;
+ sig_proc = (proc_t)get_bsdtask_info(sig_task);
+ } else {
+ sig_task = p->task;
+ sig_thread = (struct thread *)0;
+ sig_proc = p;
+ }
+
+ if ((sig_task == TASK_NULL) || is_kerneltask(sig_task))
return;
/*
* do not send signals to the process that has the thread
* doing a reboot(). Not doing so will mark that thread aborted
- * and can cause IO failures wich will cause data loss.
+ * and can cause IO failures wich will cause data loss. There's
+ * also no need to send a signal to a process that is in the middle
+ * of being torn down.
*/
- if (ISSET(p->p_flag, P_REBOOT))
+ if (ISSET(sig_proc->p_flag, P_REBOOT) ||
+ ISSET(sig_proc->p_lflag, P_LEXIT))
return;
- /*
- * if the traced process is blocked waiting for
- * gdb then do not block the caller just pend
- * the signal. Setup a callout to process the
- * pended signal if not alreadu set
+ if( (flavor & (PSIG_VFORK | PSIG_THREAD)) == 0) {
+ proc_knote(sig_proc, NOTE_SIGNAL | signum);
+ }
+
+ if ((flavor & PSIG_LOCKED)== 0)
+ proc_signalstart(sig_proc, 0);
+
+ /*
+ * Deliver the signal to the first thread in the task. This
+ * allows single threaded applications which use signals to
+ * be able to be linked with multithreaded libraries. We have
+ * an implicit reference to the current thread, but need
+ * an explicit one otherwise. The thread reference keeps
+ * the corresponding task data structures around too. This
+ * reference is released by thread_deallocate.
*/
- if (pend && (p->p_flag & P_TRACED) && p->sigwait) {
- p->p_sigpending |= mask;
- if (!(p->p_flag & P_SIGTHR)) {
- p->p_flag |= P_SIGTHR;
- thread_call_func((thread_call_func_t)psignal_pend, p,
- FALSE);
- }
- return;
+
+
+ if (((flavor & PSIG_VFORK) == 0) && ((sig_proc->p_lflag & P_LTRACED) == 0) && (sig_proc->p_sigignore & mask)) {
+ DTRACE_PROC3(signal__discard, thread_t, sig_thread, proc_t, sig_proc, int, signum);
+ goto psigout;
+ }
+
+ if (flavor & PSIG_VFORK) {
+ action = SIG_DFL;
+ act_set_astbsd(sig_thread);
+ kret = KERN_SUCCESS;
+ } else if (flavor & PSIG_THREAD) {
+ /* If successful return with ast set */
+ kret = check_actforsig(sig_task, sig_thread, 1);
+ } else {
+ /* If successful return with ast set */
+ kret = get_signalthread(sig_proc, signum, &sig_thread);
+ }
+ if (kret != KERN_SUCCESS) {
+#if SIGNAL_DEBUG
+ ram_printf(1);
+#endif /* SIGNAL_DEBUG */
+ goto psigout;
}
- if (withlock)
- signal_lock(p);
+
+ uth = get_bsdthread_info(sig_thread);
/*
* If proc is traced, always give parent a chance.
*/
- if (p->p_flag & P_TRACED)
- action = SIG_DFL;
- else {
- /*
- * If the signal is being ignored,
- * then we forget about it immediately.
- * (Note: we don't set SIGCONT in p_sigignore,
- * and if it is set to SIG_IGN,
- * action will be SIG_DFL here.)
- */
- if (p->p_sigignore & mask)
- goto psigout;
- if (p->p_sigmask & mask)
- action = SIG_HOLD;
- else if (p->p_sigcatch & mask)
- action = SIG_CATCH;
- else
+
+ if ((flavor & PSIG_VFORK) == 0) {
+ if (sig_proc->p_lflag & P_LTRACED)
action = SIG_DFL;
+ else {
+ /*
+ * If the signal is being ignored,
+ * then we forget about it immediately.
+ * (Note: we don't set SIGCONT in p_sigignore,
+ * and if it is set to SIG_IGN,
+ * action will be SIG_DFL here.)
+ */
+ if (sig_proc->p_sigignore & mask)
+ goto psigout;
+ if (uth->uu_sigwait & mask)
+ action = KERN_SIG_WAIT;
+ else if (uth->uu_sigmask & mask)
+ action = KERN_SIG_HOLD;
+ else if (sig_proc->p_sigcatch & mask)
+ action = KERN_SIG_CATCH;
+ else
+ action = SIG_DFL;
+ }
}
- if (p->p_nice > NZERO && action == SIG_DFL && (prop & SA_KILL) &&
- (p->p_flag & P_TRACED) == 0)
- p->p_nice = NZERO;
+
+ proc_lock(sig_proc);
+
+ if (sig_proc->p_nice > NZERO && action == SIG_DFL && (prop & SA_KILL) &&
+ (sig_proc->p_lflag & P_LTRACED) == 0)
+ sig_proc->p_nice = NZERO;
if (prop & SA_CONT)
- p->p_siglist &= ~stopsigmask;
+ uth->uu_siglist &= ~stopsigmask;
if (prop & SA_STOP) {
+ struct pgrp *pg;
/*
* If sending a tty stop signal to a member of an orphaned
* process group, discard the signal here if the action
* is default; don't stop the process below if sleeping,
* and don't clear any pending SIGCONT.
*/
- if (prop & SA_TTYSTOP && p->p_pgrp->pg_jobc == 0 &&
- action == SIG_DFL)
+ proc_unlock(sig_proc);
+ pg = proc_pgrp(sig_proc);
+ if (prop & SA_TTYSTOP && pg->pg_jobc == 0 &&
+ action == SIG_DFL) {
+ pg_rele(pg);
goto psigout;
- p->p_siglist &= ~contsigmask;
+ }
+ pg_rele(pg);
+ proc_lock(sig_proc);
+ uth->uu_siglist &= ~contsigmask;
}
- p->p_siglist |= mask;
+ uth->uu_siglist |= mask;
+ /*
+ * Repost AST incase sigthread has processed
+ * ast and missed signal post.
+ */
+ if (action == KERN_SIG_CATCH)
+ act_set_astbsd(sig_thread);
+
+
/*
* Defer further processing for signals which are held,
* except that stopped processes must be continued by SIGCONT.
*/
- if (action == SIG_HOLD && ((prop & SA_CONT) == 0 || p->p_stat != SSTOP))
- goto psigout;
-
- /*
- * Deliver the signal to the first thread in the task. This
- * allows single threaded applications which use signals to
- * be able to be linked with multithreaded libraries. We have
- * an implicit reference to the current_thread, but need
- * an explicit one otherwise. The thread reference keeps
- * the corresponding task data structures around too. This
- * reference is released by thread_deallocate.
- */
-
- cur_thread = current_thread(); /* this is a shuttle */
- cur_act = current_act();
-
- /* If successful return with ast set */
- kret = (kern_return_t)get_signalact(sig_task,
- &sig_thread_act, &sig_thread, 1);
-
- if ((kret != KERN_SUCCESS) || (sig_thread_act == THREAD_NULL)) {
- /* XXXX FIXME
- /* if it is sigkill, may be we should
- * inject a thread to terminate
- */
- printf("WARNING: no activation in psignal\n");
-#if SIGNAL_DEBUG
- ram_printf(1);
-#endif /* SIGNAL_DEBUG */
- goto psigout;
- }
-
- if (sig_thread == THREAD_NULL) {
- printf("WARNING: valid act; but no shutte in psignal\n");
-#if 0
- /* FIXME : NO VALID SHUTTLE */
+ /* vfork will not go thru as action is SIG_DFL */
+ if ((action == KERN_SIG_HOLD) && ((prop & SA_CONT) == 0 || sig_proc->p_stat != SSTOP)) {
+ proc_unlock(sig_proc);
goto psigout;
-#endif
}
-
/*
* SIGKILL priority twiddling moved here from above because
* it needs sig_thread. Could merge it into large switch
* below if we didn't care about priority for tracing
* as SIGKILL's action is always SIG_DFL.
*/
- if ((signum == SIGKILL) && (p->p_nice > NZERO)) {
- p->p_nice = NZERO;
-#if XXX
- /*
- * we need to make changes here to get nice to work
- * reset priority to BASEPRI_USER
- */
-#endif
+ if ((signum == SIGKILL) && (sig_proc->p_nice > NZERO)) {
+ sig_proc->p_nice = NZERO;
}
/*
* stopped) so that it can discover the signal in
* issig() and stop for the parent.
*/
- if (p->p_flag & P_TRACED) {
- if (p->p_stat != SSTOP)
- goto run;
- else
+ if (sig_proc->p_lflag & P_LTRACED) {
+ if (sig_proc->p_stat != SSTOP)
+ goto runlocked;
+ else {
+ proc_unlock(sig_proc);
+ goto psigout;
+ }
+ }
+ if ((flavor & PSIG_VFORK) != 0)
+ goto runlocked;
+
+ if (action == KERN_SIG_WAIT) {
+#if CONFIG_DTRACE
+ /*
+ * DTrace proc signal-clear returns a siginfo_t. Collect the needed info.
+ */
+ r_uid = kauth_getruid(); /* per thread credential; protected by our thread context */
+
+ bzero((caddr_t)&(uth->t_dtrace_siginfo), sizeof(uth->t_dtrace_siginfo));
+
+ uth->t_dtrace_siginfo.si_signo = signum;
+ uth->t_dtrace_siginfo.si_pid = current_proc()->p_pid;
+ uth->t_dtrace_siginfo.si_status = W_EXITCODE(signum, 0);
+ uth->t_dtrace_siginfo.si_uid = r_uid;
+ uth->t_dtrace_siginfo.si_code = 0;
+#endif
+ uth->uu_sigwait = mask;
+ uth->uu_siglist &= ~mask;
+ wakeup(&uth->uu_sigwait);
+ /* if it is SIGCONT resume whole process */
+ if (prop & SA_CONT) {
+ OSBitOrAtomic(P_CONTINUED, &sig_proc->p_flag);
+ sig_proc->p_contproc = current_proc()->p_pid;
+
+ proc_unlock(sig_proc);
+ (void) task_resume_internal(sig_task);
goto psigout;
+ }
+ proc_unlock(sig_proc);
+ goto psigout;
}
if (action != SIG_DFL) {
* Wake up the thread, but don't un-suspend it
* (except for SIGCONT).
*/
- if (prop & SA_CONT)
- (void) task_resume(sig_task);
- goto run;
+ if (prop & SA_CONT) {
+ OSBitOrAtomic(P_CONTINUED, &sig_proc->p_flag);
+ proc_unlock(sig_proc);
+ (void) task_resume_internal(sig_task);
+ proc_lock(sig_proc);
+ sig_proc->p_stat = SRUN;
+ } else if (sig_proc->p_stat == SSTOP) {
+ proc_unlock(sig_proc);
+ goto psigout;
+ }
+ /*
+ * Fill out siginfo structure information to pass to the
+ * signalled process/thread sigaction handler, when it
+ * wakes up. si_code is 0 because this is an ordinary
+ * signal, not a SIGCHLD, and so si_status is the signal
+ * number itself, instead of the child process exit status.
+ * We shift this left because it will be shifted right before
+ * it is passed to user space. kind of ugly to use W_EXITCODE
+ * this way, but it beats defining a new macro.
+ *
+ * Note: Avoid the SIGCHLD recursion case!
+ */
+ if (signum != SIGCHLD) {
+ proc_unlock(sig_proc);
+ r_uid = kauth_getruid();
+ proc_lock(sig_proc);
+
+ sig_proc->si_pid = current_proc()->p_pid;
+ sig_proc->si_status = W_EXITCODE(signum, 0);
+ sig_proc->si_uid = r_uid;
+ sig_proc->si_code = 0;
+ }
+
+ goto runlocked;
} else {
/* Default action - varies */
if (mask & stopsigmask) {
* Don't clog system with children of init
* stopped from the keyboard.
*/
- if (!(prop & SA_STOP) && p->p_pptr == initproc) {
- psignal_lock(p, SIGKILL, 0, 1);
- p->p_siglist &= ~mask;
+ if (!(prop & SA_STOP) && sig_proc->p_pptr == initproc) {
+ proc_unlock(sig_proc);
+ psignal_locked(sig_proc, SIGKILL);
+ proc_lock(sig_proc);
+ uth->uu_siglist &= ~mask;
+ proc_unlock(sig_proc);
goto psigout;
}
/*
- * Stop the task.
+ * Stop the task
+ * if task hasn't already been stopped by
+ * a signal.
*/
- if (!is_thread_running(sig_thread)) {
- /* Thread is not running
- * If task hasn't already been stopped by
- * a signal, stop it.
- */
- p->p_siglist &= ~mask;
- if (get_task_userstop(sig_task) == 0) {
+ uth->uu_siglist &= ~mask;
+ if (sig_proc->p_stat != SSTOP) {
+ sig_proc->p_xstat = signum;
+ sig_proc->p_stat = SSTOP;
+ OSBitAndAtomic(~((uint32_t)P_CONTINUED), &sig_proc->p_flag);
+ sig_proc->p_lflag &= ~P_LWAITED;
+ proc_unlock(sig_proc);
+
+ pp = proc_parentholdref(sig_proc);
+ stop(sig_proc, pp);
+ if (( pp != PROC_NULL) && ((pp->p_flag & P_NOCLDSTOP) == 0)) {
+
+ my_cred = kauth_cred_proc_ref(sig_proc);
+ r_uid = kauth_cred_getruid(my_cred);
+ kauth_cred_unref(&my_cred);
+
+ proc_lock(sig_proc);
+ pp->si_pid = sig_proc->p_pid;
/*
- * p_cursig must not be set, because
- * it will be psig()'d if it is not
- * zero, and the signal is being
- * handled here. But save the signal
- * in p_stopsig so WUNTRACED
- * option to wait can find it.
+ * POSIX: sigaction for a stopped child
+ * when sent to the parent must set the
+ * child's signal number into si_status.
*/
- p->p_xstat = signum;
- if ((p->p_pptr->p_flag & P_NOCLDSTOP) == 0)
- psignal(p->p_pptr, SIGCHLD);
- stop(p);
+ if (signum != SIGSTOP)
+ pp->si_status = WEXITSTATUS(sig_proc->p_xstat);
+ else
+ pp->si_status = W_EXITCODE(signum, signum);
+ pp->si_code = CLD_STOPPED;
+ pp->si_uid = r_uid;
+ proc_unlock(sig_proc);
+
+ psignal(pp, SIGCHLD);
}
-#if 0
- /* unconditional check is bad */
- signal_clearast(sig_thread_act);
-#endif
- goto psigout;
- } else {
- if (p->p_stat != SZOMB)
- signal_setast(cur_act);
- goto psigout;
- }
+ if (pp != PROC_NULL)
+ proc_parentdropref(pp, 0);
+ } else
+ proc_unlock(sig_proc);
+ goto psigout;
}
+ DTRACE_PROC3(signal__send, thread_t, sig_thread, proc_t, p, int, signum);
+
+ /*
+ * enters switch with sig_proc lock held but dropped when
+ * gets out of switch
+ */
switch (signum) {
/*
* Signals ignored by default have been dealt
/*
* Process will be running after 'run'
*/
- p->p_stat = SRUN;
-
- thread_abort(sig_thread_act);
+ sig_proc->p_stat = SRUN;
+ /*
+ * In scenarios where suspend/resume are racing
+ * the signal we are missing AST_BSD by the time
+ * we get here, set again to avoid races. This
+ * was the scenario with spindump enabled shutdowns.
+ * We would need to cover this approp down the line.
+ */
+ act_set_astbsd(sig_thread);
+ thread_abort(sig_thread);
+ proc_unlock(sig_proc);
goto psigout;
* Let the process run. If it's sleeping on an
* event, it remains so.
*/
- if (p->p_flag & P_TTYSLEEP) {
- p->p_flag &= ~P_TTYSLEEP;
- wakeup(&p->p_siglist);
- } else {
- (void) task_resume(sig_task);
- }
- p->p_siglist &= ~mask;
- p->p_stat = SRUN;
-#if 0
- /* do not clear AST as tcsh is sendig SIGTERM followed by
- * SIGCONT and the ast was getting cleared unconditinally
- * This is not right.
+ OSBitOrAtomic(P_CONTINUED, &sig_proc->p_flag);
+ sig_proc->p_contproc = sig_proc->p_pid;
+
+ proc_unlock(sig_proc);
+ (void) task_resume_internal(sig_task);
+ proc_lock(sig_proc);
+ /*
+ * When processing a SIGCONT, we need to check
+ * to see if there are signals pending that
+ * were not delivered because we had been
+ * previously stopped. If that's the case,
+ * we need to thread_abort_safely() to trigger
+ * interruption of the current system call to
+ * cause their handlers to fire. If it's only
+ * the SIGCONT, then don't wake up.
*/
- signal_clearast(sig_thread_act);
-#endif
+ if (((flavor & (PSIG_VFORK|PSIG_THREAD)) == 0) && (((uth->uu_siglist & ~uth->uu_sigmask) & ~sig_proc->p_sigignore) & ~mask)) {
+ uth->uu_siglist &= ~mask;
+ sig_proc->p_stat = SRUN;
+ goto runlocked;
+ }
+
+ uth->uu_siglist &= ~mask;
+ sig_proc->p_stat = SRUN;
+ proc_unlock(sig_proc);
goto psigout;
default:
+ /*
+ * A signal which has a default action of killing
+ * the process, and for which there is no handler,
+ * needs to act like SIGKILL
+ */
+ if (((flavor & (PSIG_VFORK|PSIG_THREAD)) == 0) && (action == SIG_DFL) && (prop & SA_KILL)) {
+ sig_proc->p_stat = SRUN;
+ proc_unlock(sig_proc);
+ thread_abort(sig_thread);
+ goto psigout;
+ }
+
/*
* All other signals wake up the process, but don't
* resume it.
*/
- goto run;
+ if (sig_proc->p_stat == SSTOP) {
+ proc_unlock(sig_proc);
+ goto psigout;
+ }
+ goto runlocked;
}
- }
- /*NOTREACHED*/
-run:
- /*
- * If we're being traced (possibly because someone attached us
- * while we were stopped), check for a signal from the debugger.
- */
- if (p->p_stat == SSTOP) {
- if ((p->p_flag & P_TRACED) != 0 && p->p_xstat != 0)
- p->p_siglist |= sigmask(p->p_xstat);
- }
-
- /*
- * setrunnable(p) in BSD
- */
- p->p_stat = SRUN;
+ }
+ /*NOTREACHED*/
+runlocked:
/*
- * Wake up the thread if it is interruptible.
+ * If we're being traced (possibly because someone attached us
+ * while we were stopped), check for a signal from the debugger.
*/
- thread_abort_safely(sig_thread_act);
+ if (sig_proc->p_stat == SSTOP) {
+ if ((sig_proc->p_lflag & P_LTRACED) != 0 && sig_proc->p_xstat != 0)
+ uth->uu_siglist |= sigmask(sig_proc->p_xstat);
+ if ((flavor & PSIG_VFORK) != 0) {
+ sig_proc->p_stat = SRUN;
+ }
+ proc_unlock(sig_proc);
+ } else {
+ /*
+ * setrunnable(p) in BSD and
+ * Wake up the thread if it is interruptible.
+ */
+ sig_proc->p_stat = SRUN;
+ proc_unlock(sig_proc);
+ if ((flavor & PSIG_VFORK) == 0)
+ thread_abort_safely(sig_thread);
+ }
psigout:
- if (withlock)
- signal_unlock(p);
+ if ((flavor & PSIG_LOCKED)== 0) {
+ proc_signalend(sig_proc, 0);
+ }
}
-__inline__ void
-sig_lock_to_exit(
- struct proc *p)
+void
+psignal(proc_t p, int signum)
{
- thread_t self = current_thread();
+ psignal_internal(p, NULL, NULL, 0, signum);
+}
- p->exit_thread = self;
- (void) task_suspend(p->task);
+void
+psignal_locked(proc_t p, int signum)
+{
+ psignal_internal(p, NULL, NULL, PSIG_LOCKED, signum);
}
-__inline__ int
-sig_try_locked(
- struct proc *p)
+void
+psignal_vfork(proc_t p, task_t new_task, thread_t thread, int signum)
{
- thread_t self = current_thread();
+ psignal_internal(p, new_task, thread, PSIG_VFORK, signum);
+}
- while (p->sigwait || p->exit_thread) {
- if (p->exit_thread) {
- if (p->exit_thread != self) {
- /*
- * Already exiting - no signals.
- */
- thread_abort(current_act());
- }
- return(0);
- }
- if(assert_wait_possible()) {
- assert_wait((caddr_t)&p->sigwait_thread,
- (THREAD_INTERRUPTIBLE));
- }
- signal_unlock(p);
- thread_block(0);
- signal_lock(p);
- if (thread_should_abort(self)) {
- /*
- * Terminate request - clean up.
- */
- return -1;
- }
- }
- return 1;
+static void
+psignal_uthread(thread_t thread, int signum)
+{
+ psignal_internal(PROC_NULL, TASK_NULL, thread, PSIG_THREAD, signum);
}
+
/*
* If the current process has received a signal (should be caught or cause
* termination, should interrupt current syscall), return the signal number.
* postsig(signum);
*/
int
-issignal(p)
- register struct proc *p;
-{
- register int signum, mask, prop, sigbits;
- task_t task = p->task;
- thread_t cur_thread;
- thread_act_t cur_act;
- int s;
+issignal_locked(proc_t p)
+{
+ int signum, mask, prop, sigbits;
+ thread_t cur_act;
struct uthread * ut;
- kern_return_t kret;
+ proc_t pp;
+ kauth_cred_t my_cred;
+ int retval = 0;
+ uid_t r_uid;
- cur_thread = current_thread();
- cur_act = current_act();
-
- signal_lock(p);
+ cur_act = current_thread();
+#if SIGNAL_DEBUG
+ if(rdebug_proc && (p == rdebug_proc)) {
+ ram_printf(3);
+ }
+#endif /* SIGNAL_DEBUG */
/*
* Try to grab the signal lock.
*/
if (sig_try_locked(p) <= 0) {
- signal_unlock(p);
- return (0);
+ return(0);
}
+ proc_signalstart(p, 1);
+
ut = get_bsdthread_info(cur_act);
for(;;) {
- sigbits = (ut->uu_sig |p->p_siglist) & ~p->p_sigmask;
+ sigbits = ut->uu_siglist & ~ut->uu_sigmask;
- if (p->p_flag & P_PPWAIT)
+ if (p->p_lflag & P_LPPWAIT)
sigbits &= ~stopsigmask;
if (sigbits == 0) { /* no signal to send */
- signal_unlock(p);
- return (0);
+ retval = 0;
+ goto out;
}
+
signum = ffs((long)sigbits);
mask = sigmask(signum);
prop = sigprop[signum];
- if (mask & threadmask) {
- /* we can take this signal */
- ut->uu_sig &= ~mask;
- }
-
/*
* We should see pending but ignored signals
- * only if P_TRACED was on when they were posted.
+ * only if P_LTRACED was on when they were posted.
*/
- if (mask & p->p_sigignore && (p->p_flag & P_TRACED) == 0) {
- p->p_siglist &= ~mask; /* take the signal! */
+ if (mask & p->p_sigignore && (p->p_lflag & P_LTRACED) == 0) {
+ ut->uu_siglist &= ~mask; /* take the signal! */
continue;
}
- if (p->p_flag & P_TRACED && (p->p_flag & P_PPWAIT) == 0) {
- register int hold;
- register task_t task;
+ if (p->p_lflag & P_LTRACED && (p->p_lflag & P_LPPWAIT) == 0) {
+ task_t task;
/*
* If traced, always stop, and stay
* stopped until released by the debugger.
*/
/* ptrace debugging */
p->p_xstat = signum;
- psignal(p->p_pptr, SIGCHLD);
- /*
- * XXX Have to really stop for debuggers;
- * XXX stop() doesn't do the right thing.
- * XXX Inline the task_suspend because we
- * XXX have to diddle Unix state in the
- * XXX middle of it.
- */
- task = p->task;
- task_hold(task);
- p->sigwait = TRUE;
- p->sigwait_thread = cur_act;
- p->p_stat = SSTOP;
- p->p_flag &= ~P_WAITED;
- p->p_siglist &= ~mask; /* clear the old signal */
-
- wakeup((caddr_t)p->p_pptr);
- assert_wait((caddr_t)&p->sigwait, (THREAD_INTERRUPTIBLE));
- thread_block(0);
+
+ if (p->p_lflag & P_LSIGEXC) {
+ p->sigwait = TRUE;
+ p->sigwait_thread = cur_act;
+ p->p_stat = SSTOP;
+ OSBitAndAtomic(~((uint32_t)P_CONTINUED), &p->p_flag);
+ p->p_lflag &= ~P_LWAITED;
+ ut->uu_siglist &= ~mask; /* clear the old signal */
+ proc_signalend(p, 1);
+ proc_unlock(p);
+ do_bsdexception(EXC_SOFTWARE, EXC_SOFT_SIGNAL, signum);
+ proc_lock(p);
+ proc_signalstart(p, 1);
+ } else {
+ proc_unlock(p);
+ my_cred = kauth_cred_proc_ref(p);
+ r_uid = kauth_cred_getruid(my_cred);
+ kauth_cred_unref(&my_cred);
+
+ pp = proc_parentholdref(p);
+ if (pp != PROC_NULL) {
+ proc_lock(pp);
+
+ pp->si_pid = p->p_pid;
+ pp->si_status = p->p_xstat;
+ pp->si_code = CLD_TRAPPED;
+ pp->si_uid = r_uid;
+
+ proc_unlock(pp);
+ }
+
+ /*
+ * XXX Have to really stop for debuggers;
+ * XXX stop() doesn't do the right thing.
+ */
+ task = p->task;
+ task_suspend_internal(task);
+
+ proc_lock(p);
+ p->sigwait = TRUE;
+ p->sigwait_thread = cur_act;
+ p->p_stat = SSTOP;
+ OSBitAndAtomic(~((uint32_t)P_CONTINUED), &p->p_flag);
+ p->p_lflag &= ~P_LWAITED;
+ ut->uu_siglist &= ~mask; /* clear the old signal */
+
+ proc_signalend(p, 1);
+ proc_unlock(p);
+
+ if (pp != PROC_NULL) {
+ psignal(pp, SIGCHLD);
+ proc_list_lock();
+ wakeup((caddr_t)pp);
+ proc_parentdropref(pp, 1);
+ proc_list_unlock();
+ }
+
+ assert_wait((caddr_t)&p->sigwait, (THREAD_INTERRUPTIBLE));
+ thread_block(THREAD_CONTINUE_NULL);
+ proc_lock(p);
+ proc_signalstart(p, 1);
+ }
+
p->sigwait = FALSE;
p->sigwait_thread = NULL;
wakeup((caddr_t)&p->sigwait_thread);
* pgsignal would get the SIGKILL to traced program
* That's what we are trying to see (I hope)
*/
- if (p->p_siglist & sigmask(SIGKILL)) {
+ if (ut->uu_siglist & sigmask(SIGKILL)) {
/*
* Wait event may still be outstanding;
* clear it, since sig_lock_to_exit will
* before calling exit(). (Since exit()
* calls closef() which can trash u_qsave.)
*/
- signal_unlock(p);
- exit1(p,signum);
+ proc_signalend(p, 1);
+ proc_unlock(p);
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_PROC, BSD_PROC_FRCEXIT) | DBG_FUNC_NONE,
+ p->p_pid, W_EXITCODE(0, SIGKILL), 2, 0, 0);
+ exit1(p, W_EXITCODE(0, SIGKILL), (int *)NULL);
+ proc_lock(p);
return(0);
}
* We may have to quit
*/
if (thread_should_abort(current_thread())) {
- signal_unlock(p);
- return(0);
+ retval = 0;
+ goto out;
}
/*
* If parent wants us to take the signal,
* signal is being masked, look for other signals.
*/
mask = sigmask(signum);
- if (mask & threadmask)
- ut->uu_sig |= mask;
- else
- p->p_siglist |= mask;
- if (p->p_sigmask & mask)
+ ut->uu_siglist |= mask;
+ if (ut->uu_sigmask & mask)
continue;
}
/*
* Don't take default actions on system processes.
*/
- if (p->p_pptr->p_pid == 0) {
+ if (p->p_ppid == 0) {
#if DIAGNOSTIC
/*
* Are you sure you want to ignore SIGSEGV
* process group, ignore tty stop signals.
*/
if (prop & SA_STOP) {
- if (p->p_flag & P_TRACED ||
- (p->p_pgrp->pg_jobc == 0 &&
- prop & SA_TTYSTOP))
+ struct pgrp * pg;
+
+ proc_unlock(p);
+ pg = proc_pgrp(p);
+ if (p->p_lflag & P_LTRACED ||
+ (pg->pg_jobc == 0 &&
+ prop & SA_TTYSTOP)) {
+ proc_lock(p);
+ pg_rele(pg);
break; /* == ignore */
- p->p_xstat = signum;
- stop(p);
- if ((p->p_pptr->p_flag & P_NOCLDSTOP) == 0)
- psignal(p->p_pptr, SIGCHLD);
- thread_block(0);
- /*
- * We may have to quit
- */
- if (thread_should_abort(current_thread())) {
- signal_unlock(p);
- return(0);
}
+ pg_rele(pg);
+ if (p->p_stat != SSTOP) {
+ proc_lock(p);
+ p->p_xstat = signum;
+
+ p->p_stat = SSTOP;
+ p->p_lflag &= ~P_LWAITED;
+ proc_unlock(p);
+
+ pp = proc_parentholdref(p);
+ stop(p, pp);
+ if ((pp != PROC_NULL) && ((pp->p_flag & P_NOCLDSTOP) == 0)) {
+ my_cred = kauth_cred_proc_ref(p);
+ r_uid = kauth_cred_getruid(my_cred);
+ kauth_cred_unref(&my_cred);
+
+ proc_lock(pp);
+ pp->si_pid = p->p_pid;
+ pp->si_status = WEXITSTATUS(p->p_xstat);
+ pp->si_code = CLD_STOPPED;
+ pp->si_uid = r_uid;
+ proc_unlock(pp);
+
+ psignal(pp, SIGCHLD);
+ }
+ if (pp != PROC_NULL)
+ proc_parentdropref(pp, 0);
+ }
+ proc_lock(p);
break;
} else if (prop & SA_IGNORE) {
/*
*/
break; /* == ignore */
} else {
- signal_unlock(p);
- return (signum);
+ ut->uu_siglist &= ~mask; /* take the signal! */
+ retval = signum;
+ goto out;
}
+
/*NOTREACHED*/
+ break;
case (long)SIG_IGN:
/*
* than SIGCONT, unless process is traced.
*/
if ((prop & SA_CONT) == 0 &&
- (p->p_flag & P_TRACED) == 0)
+ (p->p_lflag & P_LTRACED) == 0)
printf("issignal\n");
break; /* == ignore */
* This signal has an action, let
* postsig() process it.
*/
- signal_unlock(p);
- return (signum);
+ ut->uu_siglist &= ~mask; /* take the signal! */
+ retval = signum;
+ goto out;
}
- p->p_siglist &= ~mask; /* take the signal! */
- p->p_sigpending &= ~mask; /* take the pending signal */
+ ut->uu_siglist &= ~mask; /* take the signal! */
}
/* NOTREACHED */
+out:
+ proc_signalend(p, 1);
+ return(retval);
}
/* called from _sleep */
int
-CURSIG(p)
- register struct proc *p;
-{
- register int signum, mask, prop, sigbits;
- task_t task = p->task;
- thread_t cur_thread;
- thread_act_t cur_act;
- int s;
+CURSIG(proc_t p)
+{
+ int signum, mask, prop, sigbits;
+ thread_t cur_act;
struct uthread * ut;
int retnum = 0;
- if (p->p_siglist == 0)
- return (0);
-
- if (((p->p_siglist & ~p->p_sigmask) == 0) && ((p->p_flag & P_TRACED) == 0))
- return (0);
- cur_thread = current_thread();
- cur_act = current_act();
+ cur_act = current_thread();
ut = get_bsdthread_info(cur_act);
- sigbits = (ut->uu_sig | p->p_siglist) & ~p->p_sigmask;
+ if (ut->uu_siglist == 0)
+ return (0);
+
+ if (((ut->uu_siglist & ~ut->uu_sigmask) == 0) && ((p->p_lflag & P_LTRACED) == 0))
+ return (0);
+
+ sigbits = ut->uu_siglist & ~ut->uu_sigmask;
for(;;) {
- if (p->p_flag & P_PPWAIT)
+ if (p->p_lflag & P_LPPWAIT)
sigbits &= ~stopsigmask;
if (sigbits == 0) { /* no signal to send */
return (retnum);
signum = ffs((long)sigbits);
mask = sigmask(signum);
prop = sigprop[signum];
+ sigbits &= ~mask; /* take the signal out */
/*
* We should see pending but ignored signals
- * only if P_TRACED was on when they were posted.
+ * only if P_LTRACED was on when they were posted.
*/
- if (mask & p->p_sigignore && (p->p_flag & P_TRACED) == 0) {
+ if (mask & p->p_sigignore && (p->p_lflag & P_LTRACED) == 0) {
continue;
}
- if (p->p_flag & P_TRACED && (p->p_flag & P_PPWAIT) == 0) {
- /*
- * Put the new signal into p_siglist. If the
- * signal is being masked, look for other signals.
- */
- mask = sigmask(signum);
- if (p->p_sigmask & mask)
- continue;
+
+ if (p->p_lflag & P_LTRACED && (p->p_lflag & P_LPPWAIT) == 0) {
return(signum);
}
/*
* Don't take default actions on system processes.
*/
- if (p->p_pptr->p_pid == 0) {
+ if (p->p_ppid == 0) {
#if DIAGNOSTIC
/*
* Are you sure you want to ignore SIGSEGV
* process group, ignore tty stop signals.
*/
if (prop & SA_STOP) {
- if (p->p_flag & P_TRACED ||
- (p->p_pgrp->pg_jobc == 0 &&
- prop & SA_TTYSTOP))
+ struct pgrp *pg;
+
+ pg = proc_pgrp(p);
+
+ if (p->p_lflag & P_LTRACED ||
+ (pg->pg_jobc == 0 &&
+ prop & SA_TTYSTOP)) {
+ pg_rele(pg);
break; /* == ignore */
+ }
+ pg_rele(pg);
retnum = signum;
break;
} else if (prop & SA_IGNORE) {
* than SIGCONT, unless process is traced.
*/
if ((prop & SA_CONT) == 0 &&
- (p->p_flag & P_TRACED) == 0)
+ (p->p_lflag & P_LTRACED) == 0)
printf("issignal\n");
break; /* == ignore */
*/
return (signum);
}
- sigbits &= ~mask; /* take the signal! */
}
/* NOTREACHED */
}
* via wakeup. Signals are handled elsewhere. The process must not be
* on the run queue.
*/
-void
-stop(p)
- register struct proc *p;
+static void
+stop(proc_t p, proc_t parent)
{
- p->p_stat = SSTOP;
- p->p_flag &= ~P_WAITED;
- wakeup((caddr_t)p->p_pptr);
- (void) task_suspend(p->task); /*XXX*/
+ OSBitAndAtomic(~((uint32_t)P_CONTINUED), &p->p_flag);
+ if ((parent != PROC_NULL) && (parent->p_stat != SSTOP)) {
+ proc_list_lock();
+ wakeup((caddr_t)parent);
+ proc_list_unlock();
+ }
+ (void) task_suspend_internal(p->task);
}
/*
* from the current set of pending signals.
*/
void
-postsig(signum)
- register int signum;
+postsig_locked(int signum)
{
- register struct proc *p = current_proc();
- register struct sigacts *ps = p->p_sigacts;
- register sig_t action;
- u_long code;
+ proc_t p = current_proc();
+ struct sigacts *ps = p->p_sigacts;
+ user_addr_t catcher;
+ uint32_t code;
int mask, returnmask;
+ struct uthread * ut;
#if DIAGNOSTIC
if (signum == 0)
panic("psig not on master");
#endif
- signal_lock(p);
/*
* Try to grab the signal lock.
*/
if (sig_try_locked(p) <= 0) {
- signal_unlock(p);
return;
}
+ proc_signalstart(p, 1);
+
+ ut = (struct uthread *)get_bsdthread_info(current_thread());
mask = sigmask(signum);
- p->p_siglist &= ~mask;
- action = ps->ps_sigact[signum];
-#if KTRACE
- if (KTRPOINT(p, KTR_PSIG))
- ktrpsig(p->p_tracep,
- signum, action, ps->ps_flags & SAS_OLDMASK ?
- ps->ps_oldmask : p->p_sigmask, 0);
-#endif
- if (action == SIG_DFL) {
+ ut->uu_siglist &= ~mask;
+ catcher = ps->ps_sigact[signum];
+ if (catcher == SIG_DFL) {
/*
- * Default action, where the default is to kill
+ * Default catcher, where the default is to kill
* the process. (Other cases were ignored above.)
*/
- /* called with signal_lock() held */
- sigexit_locked(p, signum);
+ sig_lock_to_exit(p);
+ p->p_acflag |= AXSIG;
+ if (sigprop[signum] & SA_CORE) {
+ p->p_sigacts->ps_sig = signum;
+ proc_signalend(p, 1);
+ proc_unlock(p);
+ if (coredump(p, 0, 0) == 0)
+ signum |= WCOREFLAG;
+ } else {
+ proc_signalend(p, 1);
+ proc_unlock(p);
+ }
+
+#if CONFIG_DTRACE
+ bzero((caddr_t)&(ut->t_dtrace_siginfo), sizeof(ut->t_dtrace_siginfo));
+
+ ut->t_dtrace_siginfo.si_signo = signum;
+ ut->t_dtrace_siginfo.si_pid = p->si_pid;
+ ut->t_dtrace_siginfo.si_uid = p->si_uid;
+ ut->t_dtrace_siginfo.si_status = WEXITSTATUS(p->si_status);
+
+ /* Fire DTrace proc:::fault probe when signal is generated by hardware. */
+ switch (signum) {
+ case SIGILL: case SIGBUS: case SIGSEGV: case SIGFPE: case SIGTRAP:
+ DTRACE_PROC2(fault, int, (int)(ut->uu_code), siginfo_t *, &(ut->t_dtrace_siginfo));
+ break;
+ default:
+ break;
+ }
+
+
+ DTRACE_PROC3(signal__handle, int, signum, siginfo_t *, &(ut->t_dtrace_siginfo),
+ void (*)(void), SIG_DFL);
+#endif
+
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_PROC, BSD_PROC_FRCEXIT) | DBG_FUNC_NONE,
+ p->p_pid, W_EXITCODE(0, signum), 3, 0, 0);
+ exit1(p, W_EXITCODE(0, signum), (int *)NULL);
+ proc_lock(p);
return;
- /* NOTREACHED */
} else {
/*
* If we get here, the signal must be caught.
*/
#if DIAGNOSTIC
- if (action == SIG_IGN || (p->p_sigmask & mask))
+ if (catcher == SIG_IGN || (ut->uu_sigmask & mask))
log(LOG_WARNING,
"postsig: processing masked or ignored signal\n");
#endif
+
/*
* Set the new mask value and also defer further
* occurences of this signal.
* mask from before the sigpause is what we want
* restored after the signal processing is completed.
*/
- if (ps->ps_flags & SAS_OLDMASK) {
- returnmask = ps->ps_oldmask;
- ps->ps_flags &= ~SAS_OLDMASK;
+ if (ut->uu_flag & UT_SAS_OLDMASK) {
+ returnmask = ut->uu_oldmask;
+ ut->uu_flag &= ~UT_SAS_OLDMASK;
+ ut->uu_oldmask = 0;
} else
- returnmask = p->p_sigmask;
- p->p_sigmask |= ps->ps_catchmask[signum] | mask;
+ returnmask = ut->uu_sigmask;
+ ut->uu_sigmask |= ps->ps_catchmask[signum];
+ if ((ps->ps_signodefer & mask) == 0)
+ ut->uu_sigmask |= mask;
+ if ((signum != SIGILL) && (signum != SIGTRAP) && (ps->ps_sigreset & mask)) {
+ if ((signum != SIGCONT) && (sigprop[signum] & SA_IGNORE))
+ p->p_sigignore |= mask;
+ ps->ps_sigact[signum] = SIG_DFL;
+ ps->ps_siginfo &= ~mask;
+ ps->ps_signodefer &= ~mask;
+ }
+
if (ps->ps_sig != signum) {
code = 0;
} else {
code = ps->ps_code;
ps->ps_code = 0;
}
- p->p_stats->p_ru.ru_nsignals++;
- sendsig(p, action, signum, returnmask, code);
+ OSIncrementAtomicLong(&p->p_stats->p_ru.ru_nsignals);
+ sendsig(p, catcher, signum, returnmask, code);
}
- signal_unlock(p);
+ proc_signalend(p, 1);
}
/*
- * Force the current process to exit with the specified signal, dumping core
- * if appropriate. We bypass the normal tests for masked and caught signals,
- * allowing unrecoverable failures to terminate the process without changing
- * signal state. Mark the accounting record with the signal termination.
- * If dumping core, save the signal number for the debugger. Calls exit and
- * does not return.
+ * Attach a signal knote to the list of knotes for this process.
+ *
+ * Signal knotes share the knote list with proc knotes. This
+ * could be avoided by using a signal-specific knote list, but
+ * probably isn't worth the trouble.
*/
- /* called with signal lock */
-void
-sigexit_locked(p, signum)
- register struct proc *p;
- int signum;
+
+static int
+filt_sigattach(struct knote *kn)
+{
+ proc_t p = current_proc(); /* can attach only to oneself */
+
+ proc_klist_lock();
+
+ kn->kn_ptr.p_proc = p;
+ kn->kn_flags |= EV_CLEAR; /* automatically set */
+
+ KNOTE_ATTACH(&p->p_klist, kn);
+
+ proc_klist_unlock();
+
+ return (0);
+}
+
+/*
+ * remove the knote from the process list, if it hasn't already
+ * been removed by exit processing.
+ */
+
+static void
+filt_sigdetach(struct knote *kn)
+{
+ proc_t p = kn->kn_ptr.p_proc;
+
+ proc_klist_lock();
+ kn->kn_ptr.p_proc = NULL;
+ KNOTE_DETACH(&p->p_klist, kn);
+ proc_klist_unlock();
+}
+
+/*
+ * Post an event to the signal filter. Because we share the same list
+ * as process knotes, we have to filter out and handle only signal events.
+ *
+ * We assume that we process fdfree() before we post the NOTE_EXIT for
+ * a process during exit. Therefore, since signal filters can only be
+ * set up "in-process", we should have already torn down the kqueue
+ * hosting the EVFILT_SIGNAL knote and should never see NOTE_EXIT.
+ */
+static int
+filt_signal(struct knote *kn, long hint)
{
- sig_lock_to_exit(p);
- p->p_acflag |= AXSIG;
- if (sigprop[signum] & SA_CORE) {
- p->p_sigacts->ps_sig = signum;
- if (coredump(p) == 0)
- signum |= WCOREFLAG;
+ if (hint & NOTE_SIGNAL) {
+ hint &= ~NOTE_SIGNAL;
+
+ if (kn->kn_id == (unsigned int)hint)
+ kn->kn_data++;
+ } else if (hint & NOTE_EXIT) {
+ panic("filt_signal: detected NOTE_EXIT event");
}
- signal_unlock(p);
- exit1(p, W_EXITCODE(0, signum));
- /* NOTREACHED */
+
+ return (kn->kn_data != 0);
+}
+
+static void
+filt_signaltouch(struct knote *kn, struct kevent64_s *kev, long type)
+{
+ proc_klist_lock();
+ switch (type) {
+ case EVENT_REGISTER:
+ kn->kn_sfflags = kev->fflags;
+ kn->kn_sdata = kev->data;
+ break;
+ case EVENT_PROCESS:
+ *kev = kn->kn_kevent;
+ if (kn->kn_flags & EV_CLEAR) {
+ kn->kn_data = 0;
+ kn->kn_fflags = 0;
+ }
+ break;
+ default:
+ panic("filt_machporttouch() - invalid type (%ld)", type);
+ break;
+ }
+ proc_klist_unlock();
}
void
-bsd_ast(thread_act_t thr_act)
+bsd_ast(thread_t thread)
{
- struct proc *p = current_proc();
- struct uthread *ut = get_bsdthread_info(thr_act);
+ proc_t p = current_proc();
+ struct uthread *ut = get_bsdthread_info(thread);
int signum;
- unsigned int pc;
- boolean_t funnel_state;
+ user_addr_t pc;
+ static int bsd_init_done = 0;
if (p == NULL)
return;
- funnel_state = thread_funnel_set(kernel_flock, TRUE);
-
if ((p->p_flag & P_OWEUPC) && (p->p_flag & P_PROFIL)) {
pc = get_useraddr();
addupc_task(p, pc, 1);
- p->p_flag &= ~P_OWEUPC;
+ OSBitAndAtomic(~((uint32_t)P_OWEUPC), &p->p_flag);
+ }
+
+ if (timerisset(&p->p_vtimer_user.it_value)) {
+ uint32_t microsecs;
+
+ task_vtimer_update(p->task, TASK_VTIMER_USER, µsecs);
+
+ if (!itimerdecr(p, &p->p_vtimer_user, microsecs)) {
+ if (timerisset(&p->p_vtimer_user.it_value))
+ task_vtimer_set(p->task, TASK_VTIMER_USER);
+ else
+ task_vtimer_clear(p->task, TASK_VTIMER_USER);
+
+ psignal(p, SIGVTALRM);
+ }
+ }
+
+ if (timerisset(&p->p_vtimer_prof.it_value)) {
+ uint32_t microsecs;
+
+ task_vtimer_update(p->task, TASK_VTIMER_PROF, µsecs);
+
+ if (!itimerdecr(p, &p->p_vtimer_prof, microsecs)) {
+ if (timerisset(&p->p_vtimer_prof.it_value))
+ task_vtimer_set(p->task, TASK_VTIMER_PROF);
+ else
+ task_vtimer_clear(p->task, TASK_VTIMER_PROF);
+
+ psignal(p, SIGPROF);
+ }
+ }
+
+ if (timerisset(&p->p_rlim_cpu)) {
+ struct timeval tv;
+
+ task_vtimer_update(p->task, TASK_VTIMER_RLIM, (uint32_t *) &tv.tv_usec);
+
+ proc_spinlock(p);
+ if (p->p_rlim_cpu.tv_sec > 0 || p->p_rlim_cpu.tv_usec > tv.tv_usec) {
+ tv.tv_sec = 0;
+ timersub(&p->p_rlim_cpu, &tv, &p->p_rlim_cpu);
+ proc_spinunlock(p);
+ } else {
+
+ timerclear(&p->p_rlim_cpu);
+ proc_spinunlock(p);
+
+ task_vtimer_clear(p->task, TASK_VTIMER_RLIM);
+
+ psignal(p, SIGXCPU);
+ }
+ }
+
+#if CONFIG_DTRACE
+ if (ut->t_dtrace_sig) {
+ uint8_t dt_action_sig = ut->t_dtrace_sig;
+ ut->t_dtrace_sig = 0;
+ psignal(p, dt_action_sig);
+ }
+
+ if (ut->t_dtrace_stop) {
+ ut->t_dtrace_stop = 0;
+ proc_lock(p);
+ p->p_dtrace_stop = 1;
+ proc_unlock(p);
+ (void)task_suspend_internal(p->task);
+ }
+
+ if (ut->t_dtrace_resumepid) {
+ proc_t resumeproc = proc_find(ut->t_dtrace_resumepid);
+ ut->t_dtrace_resumepid = 0;
+ if (resumeproc != PROC_NULL) {
+ proc_lock(resumeproc);
+ /* We only act on processes stopped by dtrace */
+ if (resumeproc->p_dtrace_stop) {
+ resumeproc->p_dtrace_stop = 0;
+ proc_unlock(resumeproc);
+ task_resume_internal(resumeproc->task);
+ }
+ else {
+ proc_unlock(resumeproc);
+ }
+ proc_rele(resumeproc);
+ }
}
+
+#endif /* CONFIG_DTRACE */
+ proc_lock(p);
if (CHECK_SIGNALS(p, current_thread(), ut)) {
- while (signum = issignal(p))
- postsig(signum);
+ while ( (signum = issignal_locked(p)) )
+ postsig_locked(signum);
+ }
+ proc_unlock(p);
+
+ if (!bsd_init_done) {
+ bsd_init_done = 1;
+ bsdinit_task();
+ }
+
+}
+
+/* ptrace set runnable */
+void
+pt_setrunnable(proc_t p)
+{
+ task_t task;
+
+ task = p->task;
+
+ if (p->p_lflag & P_LTRACED) {
+ proc_lock(p);
+ p->p_stat = SRUN;
+ proc_unlock(p);
+ if (p->sigwait) {
+ wakeup((caddr_t)&(p->sigwait));
+ if ((p->p_lflag & P_LSIGEXC) == 0) { // 5878479
+ task_release(task);
+ }
+ }
+ }
+}
+
+kern_return_t
+do_bsdexception(
+ int exc,
+ int code,
+ int sub)
+{
+ mach_exception_data_type_t codes[EXCEPTION_CODE_MAX];
+
+ codes[0] = code;
+ codes[1] = sub;
+ return(bsd_exception(exc, codes, 2));
+}
+
+int
+proc_pendingsignals(proc_t p, sigset_t mask)
+{
+ struct uthread * uth;
+ thread_t th;
+ sigset_t bits = 0;
+
+ proc_lock(p);
+ /* If the process is in proc exit return no signal info */
+ if (p->p_lflag & P_LPEXIT) {
+ goto out;
+ }
+
+ if ((p->p_lflag & P_LINVFORK) && p->p_vforkact) {
+ th = p->p_vforkact;
+ uth = (struct uthread *)get_bsdthread_info(th);
+ if (uth) {
+ bits = (((uth->uu_siglist & ~uth->uu_sigmask) & ~p->p_sigignore) & mask);
+ }
+ goto out;
+ }
+
+ bits = 0;
+ TAILQ_FOREACH(uth, &p->p_uthlist, uu_list) {
+ bits |= (((uth->uu_siglist & ~uth->uu_sigmask) & ~p->p_sigignore) & mask);
}
- ast_off(AST_BSD);
+out:
+ proc_unlock(p);
+ return(bits);
+}
+
+int
+thread_issignal(proc_t p, thread_t th, sigset_t mask)
+{
+ struct uthread * uth;
+ sigset_t bits=0;
- (void) thread_funnel_set(kernel_flock, FALSE);
+ proc_lock(p);
+ uth = (struct uthread *)get_bsdthread_info(th);
+ if (uth) {
+ bits = (((uth->uu_siglist & ~uth->uu_sigmask) & ~p->p_sigignore) & mask);
+ }
+ proc_unlock(p);
+ return(bits);
}
/*
- * Follwing routines are called using callout from bsd_hardclock
- * so that psignals are called in a thread context and are funneled
+ * Allow external reads of the sigprop array.
*/
-void
-psignal_vtalarm(struct proc *p)
+int
+hassigprop(int sig, int prop)
{
- boolean_t funnel_state;
+ return (sigprop[sig] & prop);
+}
- if (p == NULL)
- return;
- funnel_state = thread_funnel_set(kernel_flock, TRUE);
- psignal_lock(p, SIGVTALRM, 1, 1);
- (void) thread_funnel_set(kernel_flock, FALSE);
+void
+pgsigio(pid_t pgid, int sig)
+{
+ proc_t p = PROC_NULL;
+
+ if (pgid < 0)
+ gsignal(-(pgid), sig);
+
+ else if (pgid > 0 && (p = proc_find(pgid)) != 0)
+ psignal(p, sig);
+ if (p != PROC_NULL)
+ proc_rele(p);
}
void
-psignal_xcpu(struct proc *p)
+proc_signalstart(proc_t p, int locked)
{
- boolean_t funnel_state;
-
- if (p == NULL)
- return;
- funnel_state = thread_funnel_set(kernel_flock, TRUE);
- psignal_lock(p, SIGXCPU, 1, 1);
- (void) thread_funnel_set(kernel_flock, FALSE);
+ if (!locked)
+ proc_lock(p);
+
+ if(p->p_signalholder == current_thread())
+ panic("proc_signalstart: thread attempting to signal a process for which it holds the signal lock");
+
+ p->p_sigwaitcnt++;
+ while ((p->p_lflag & P_LINSIGNAL) == P_LINSIGNAL)
+ msleep(&p->p_sigmask, &p->p_mlock, 0, "proc_signstart", NULL);
+ p->p_sigwaitcnt--;
+
+ p->p_lflag |= P_LINSIGNAL;
+ p->p_signalholder = current_thread();
+ if (!locked)
+ proc_unlock(p);
}
void
-psignal_sigprof(struct proc *p)
+proc_signalend(proc_t p, int locked)
{
- boolean_t funnel_state;
+ if (!locked)
+ proc_lock(p);
+ p->p_lflag &= ~P_LINSIGNAL;
- if (p == NULL)
- return;
- funnel_state = thread_funnel_set(kernel_flock, TRUE);
- psignal_lock(p, SIGPROF, 1, 1);
- (void) thread_funnel_set(kernel_flock, FALSE);
+ if (p->p_sigwaitcnt > 0)
+ wakeup(&p->p_sigmask);
+
+ p->p_signalholder = NULL;
+ if (!locked)
+ proc_unlock(p);
}
-/* ptrace set runnalbe */
void
-pt_setrunnable(struct proc *p)
+sig_lock_to_exit(proc_t p)
{
-task_t task;
+ thread_t self = current_thread();
- task = p->task;
+ p->exit_thread = self;
+ proc_unlock(p);
- if (p->p_flag & P_TRACED) {
- p->p_stat = SRUN;
- if (p->sigwait) {
- wakeup((caddr_t)&(p->sigwait));
- task_release(task);
+ task_hold(p->task);
+ task_wait(p->task, FALSE);
+
+ proc_lock(p);
+}
+
+int
+sig_try_locked(proc_t p)
+{
+ thread_t self = current_thread();
+
+ while (p->sigwait || p->exit_thread) {
+ if (p->exit_thread) {
+ return(0);
+ }
+ msleep((caddr_t)&p->sigwait_thread, &p->p_mlock, PCATCH | PDROP, 0, 0);
+ if (thread_should_abort(self)) {
+ /*
+ * Terminate request - clean up.
+ */
+ proc_lock(p);
+ return -1;
}
+ proc_lock(p);
}
+ return 1;
}
projects / apple / xnu.git / blobdiff