bsd/sys/signalvar.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
  23 /*
  24  * Copyright (c) 1991, 1993
  25  *      The Regents of the University of California.  All rights reserved.
  26  *
  27  * Redistribution and use in source and binary forms, with or without
  28  * modification, are permitted provided that the following conditions
  29  * are met:
  30  * 1. Redistributions of source code must retain the above copyright
  31  *    notice, this list of conditions and the following disclaimer.
  32  * 2. Redistributions in binary form must reproduce the above copyright
  33  *    notice, this list of conditions and the following disclaimer in the
  34  *    documentation and/or other materials provided with the distribution.
  35  * 3. All advertising materials mentioning features or use of this software
  36  *    must display the following acknowledgement:
  37  *      This product includes software developed by the University of
  38  *      California, Berkeley and its contributors.
  39  * 4. Neither the name of the University nor the names of its contributors
  40  *    may be used to endorse or promote products derived from this software
  41  *    without specific prior written permission.
  42  *
  43  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  44  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  45  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  46  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  47  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  48  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  49  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  50  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  51  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  52  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  53  * SUCH DAMAGE.
  54  *
  55  *      @(#)signalvar.h 8.3 (Berkeley) 1/4/94
  56  */
  57
  58 #ifndef _SYS_SIGNALVAR_H_               /* tmp for user.h */
  59 #define _SYS_SIGNALVAR_H_
  60
  61 /*
  62  * Kernel signal definitions and data structures,
  63  * not exported to user programs.
  64  */
  65
  66 /*
  67  * Process signal actions and state, needed only within the process
  68  * (not necessarily resident).
  69  */
  70 struct  sigacts {
  71         sig_t   ps_sigact[NSIG];        /* disposition of signals */
  72         sigset_t ps_catchmask[NSIG];    /* signals to be blocked */
  73         sigset_t ps_sigonstack;         /* signals to take on sigstack */
  74         sigset_t ps_sigintr;            /* signals that interrupt syscalls */
  75         sigset_t ps_oldmask;            /* saved mask from before sigpause */
  76         int     ps_flags;               /* signal flags, below */
  77         struct  sigaltstack ps_sigstk;  /* sp & on stack state variable */
  78         int     ps_sig;                 /* for core dump/debugger XXX */
  79         int     ps_code;                /* for core dump/debugger XXX */
  80         int     ps_addr;                /* for core dump/debugger XXX */
  81         sigset_t ps_usertramp;          /* SunOS compat; libc sigtramp XXX */
  82 };
  83
  84 /* signal flags */
  85 #define SAS_OLDMASK     0x01            /* need to restore mask before pause */
  86 #define SAS_ALTSTACK    0x02            /* have alternate signal stack */
  87
  88 /* additional signal action values, used only temporarily/internally */
  89 #define SIG_CATCH       (void (*)())2
  90 #define SIG_HOLD        (void (*)())3
  91
  92
  93 #define pgsigio(pgid, sig, notused) \
  94         { \
  95         struct proc *p; \
  96         if (pgid < 0) \
  97                 gsignal(-(pgid), sig);\
  98         else if (pgid > 0 && (p = pfind(pgid)) != 0) \
  99                 psignal(p, sig); \
 100 }
 101
 102
 103 /*
 104  * get signal action for process and signal; currently only for current process
 105  */
 106 #define SIGACTION(p, sig)       (p->p_sigacts->ps_sigact[(sig)])
 107
 108 /*
 109  * Determine signal that should be delivered to process p, the current
 110  * process, 0 if none.  If there is a pending stop signal with default
 111  * action, the process stops in issig().
 112  */
 113
 114 #define HAVE_SIGNALS(p) \
 115          ((p)->p_siglist \
 116           & ~((((p)->p_sigmask) \
 117                | (((p)->p_flag & P_TRACED) ? 0 : (p)->p_sigignore)) \
 118               & ~sigcantmask))
 119
 120 /*
 121  *      Check for per-process and per thread signals.
 122  */
 123 #define SHOULDissignal(p,uthreadp) \
 124          (((p)->p_siglist | (uthreadp)->uu_sig) \
 125           & ~((((p)->p_sigmask) \
 126                | (((p)->p_flag & P_TRACED) ? 0 : (p)->p_sigignore)) \
 127               & ~sigcantmask))
 128
 129 /*
 130  *      Check for signals and per-thread signals.
 131  *  Use in trap() and syscall() before
 132  *      exiting kernel.
 133  */
 134 #define CHECK_SIGNALS(p, thread, uthreadp)      \
 135         (!thread_should_halt(thread)    \
 136          && (SHOULDissignal(p,uthreadp)))
 137
 138
 139 /*
 140  * Clear a pending signal from a process.
 141  */
 142 #define CLRSIG(p, sig)  { (p)->p_siglist &= ~sigmask(sig); }
 143
 144 /*
 145  * Signal properties and actions.
 146  * The array below categorizes the signals and their default actions
 147  * according to the following properties:
 148  */
 149 #define SA_KILL         0x01            /* terminates process by default */
 150 #define SA_CORE         0x02            /* ditto and coredumps */
 151 #define SA_STOP         0x04            /* suspend process */
 152 #define SA_TTYSTOP      0x08            /* ditto, from tty */
 153 #define SA_IGNORE       0x10            /* ignore by default */
 154 #define SA_CONT         0x20            /* continue if suspended */
 155 #define SA_CANTMASK     0x40            /* non-maskable, catchable */
 156
 157 #ifdef  SIGPROP
 158 int sigprop[NSIG + 1] = {
 159         0,                      /* unused */
 160         SA_KILL,                /* SIGHUP */
 161         SA_KILL,                /* SIGINT */
 162         SA_KILL|SA_CORE,        /* SIGQUIT */
 163         SA_KILL|SA_CORE,        /* SIGILL */
 164         SA_KILL|SA_CORE,        /* SIGTRAP */
 165         SA_KILL|SA_CORE,        /* SIGABRT */
 166         SA_KILL|SA_CORE,        /* SIGEMT */
 167         SA_KILL|SA_CORE,        /* SIGFPE */
 168         SA_KILL,                /* SIGKILL */
 169         SA_KILL|SA_CORE,        /* SIGBUS */
 170         SA_KILL|SA_CORE,        /* SIGSEGV */
 171         SA_KILL|SA_CORE,        /* SIGSYS */
 172         SA_KILL,                /* SIGPIPE */
 173         SA_KILL,                /* SIGALRM */
 174         SA_KILL,                /* SIGTERM */
 175         SA_IGNORE,              /* SIGURG */
 176         SA_STOP,                /* SIGSTOP */
 177         SA_STOP|SA_TTYSTOP,     /* SIGTSTP */
 178         SA_IGNORE|SA_CONT,      /* SIGCONT */
 179         SA_IGNORE,              /* SIGCHLD */
 180         SA_STOP|SA_TTYSTOP,     /* SIGTTIN */
 181         SA_STOP|SA_TTYSTOP,     /* SIGTTOU */
 182         SA_IGNORE,              /* SIGIO */
 183         SA_KILL,                /* SIGXCPU */
 184         SA_KILL,                /* SIGXFSZ */
 185         SA_KILL,                /* SIGVTALRM */
 186         SA_KILL,                /* SIGPROF */
 187         SA_IGNORE,              /* SIGWINCH  */
 188         SA_IGNORE,              /* SIGINFO */
 189         SA_KILL,                /* SIGUSR1 */
 190         SA_KILL,                /* SIGUSR2 */
 191 };
 192
 193 #define contsigmask     (sigmask(SIGCONT))
 194 #define stopsigmask     (sigmask(SIGSTOP) | sigmask(SIGTSTP) | \
 195                             sigmask(SIGTTIN) | sigmask(SIGTTOU))
 196
 197 #endif /* SIGPROP */
 198
 199 #define sigcantmask     (sigmask(SIGKILL) | sigmask(SIGSTOP))
 200
 201 #ifdef KERNEL
 202 /*
 203  * Machine-independent functions:
 204  */
 205 int     coredump __P((struct proc *p));
 206 void    execsigs __P((struct proc *p));
 207 void    gsignal __P((int pgid, int sig));
 208 int     issignal __P((struct proc *p));
 209 int     CURSIG __P((struct proc *p));
 210 int clear_sigbits __P((struct proc *p, int bit));
 211 void    pgsignal __P((struct pgrp *pgrp, int sig, int checkctty));
 212 void    postsig __P((int sig));
 213 void    psignal __P((struct proc *p, int sig));
 214 void    siginit __P((struct proc *p));
 215 void    trapsignal __P((struct proc *p, int sig, unsigned code));
 216 void    pt_setrunnable __P((struct proc *p));
 217
 218 /*
 219  * Machine-dependent functions:
 220  */
 221 void    sendsig __P((struct proc *, sig_t action, int sig, int returnmask, u_long code));
 222 #endif  /* KERNEL */
 223 #endif  /* !_SYS_SIGNALVAR_H_ */