bsd/sys/proc_internal.h

   1 /*
   2  * Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License.  The rights granted to you under the
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /* Copyright (c) 1995, 1997 Apple Computer, Inc. All Rights Reserved */
  31 /*-
  32  * Copyright (c) 1986, 1989, 1991, 1993
  33  *      The Regents of the University of California.  All rights reserved.
  34  * (c) UNIX System Laboratories, Inc.
  35  * All or some portions of this file are derived from material licensed
  36  * to the University of California by American Telephone and Telegraph
  37  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
  38  * the permission of UNIX System Laboratories, Inc.
  39  *
  40  * Redistribution and use in source and binary forms, with or without
  41  * modification, are permitted provided that the following conditions
  42  * are met:
  43  * 1. Redistributions of source code must retain the above copyright
  44  *    notice, this list of conditions and the following disclaimer.
  45  * 2. Redistributions in binary form must reproduce the above copyright
  46  *    notice, this list of conditions and the following disclaimer in the
  47  *    documentation and/or other materials provided with the distribution.
  48  * 3. All advertising materials mentioning features or use of this software
  49  *    must display the following acknowledgement:
  50  *      This product includes software developed by the University of
  51  *      California, Berkeley and its contributors.
  52  * 4. Neither the name of the University nor the names of its contributors
  53  *    may be used to endorse or promote products derived from this software
  54  *    without specific prior written permission.
  55  *
  56  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  57  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  58  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  59  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  60  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  61  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  62  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  63  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  64  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  65  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  66  * SUCH DAMAGE.
  67  *
  68  *      @(#)proc_internal.h     8.15 (Berkeley) 5/19/95
  69  */
  70
  71 #ifndef _SYS_PROC_INTERNAL_H_
  72 #define _SYS_PROC_INTERNAL_H_
  73
  74 #include <sys/proc.h>
  75 __BEGIN_DECLS
  76 #include <kern/locks.h>
  77 __END_DECLS
  78
  79 /*
  80  * One structure allocated per session.
  81  */
  82 struct  session {
  83         int     s_count;                /* Ref cnt; pgrps in session. */
  84         struct  proc *s_leader;         /* Session leader. */
  85         struct  vnode *s_ttyvp;         /* Vnode of controlling terminal. */
  86         struct  tty *s_ttyp;            /* Controlling terminal. */
  87         pid_t   s_sid;          /* Session ID */
  88         char    s_login[MAXLOGNAME];    /* Setlogin() name. */
  89 };
  90
  91 /*
  92  * One structure allocated per process group.
  93  */
  94 struct  pgrp {
  95         LIST_ENTRY(pgrp) pg_hash;       /* Hash chain. */
  96         LIST_HEAD(, proc) pg_members;   /* Pointer to pgrp members. */
  97         struct  session *pg_session;    /* Pointer to session. */
  98         pid_t   pg_id;                  /* Pgrp id. */
  99         int     pg_jobc;        /* # procs qualifying pgrp for job control */
 100 };
 101
 102 struct proc;
 103
 104 #define PROC_NULL (struct proc *)0
 105
 106 #define p_session       p_pgrp->pg_session
 107 #define p_pgid          p_pgrp->pg_id
 108
 109 /*
 110  * Description of a process.
 111  *
 112  * This structure contains the information needed to manage a thread of
 113  * control, known in UN*X as a process; it has references to substructures
 114  * containing descriptions of things that the process uses, but may share
 115  * with related processes.  The process structure and the substructures
 116  * are always addressible except for those marked "(PROC ONLY)" below,
 117  * which might be addressible only on a processor on which the process
 118  * is running.
 119  */
 120 struct  proc {
 121         LIST_ENTRY(proc) p_list;        /* List of all processes. */
 122
 123         /* substructures: */
 124         struct  ucred *p_ucred;         /* Process owner's identity. */
 125         struct  filedesc *p_fd;         /* Ptr to open files structure. */
 126         struct  pstats *p_stats;        /* Accounting/statistics (PROC ONLY). */
 127         struct  plimit *p_limit;        /* Process limits. */
 128         struct  sigacts *p_sigacts;     /* Signal actions, state (PROC ONLY). */
 129
 130 #define p_rlimit        p_limit->pl_rlimit
 131
 132         int     p_flag;                 /* P_* flags. */
 133         char    p_stat;                 /* S* process status. */
 134         char    p_shutdownstate;
 135         char    p_pad1[2];
 136
 137         pid_t   p_pid;                  /* Process identifier. */
 138         LIST_ENTRY(proc) p_pglist;      /* List of processes in pgrp. */
 139         struct  proc *p_pptr;           /* Pointer to parent process. */
 140         LIST_ENTRY(proc) p_sibling;     /* List of sibling processes. */
 141         LIST_HEAD(, proc) p_children;   /* Pointer to list of children. */
 142
 143 /* The following fields are all zeroed upon creation in fork. */
 144 #define p_startzero     p_oppid
 145
 146         pid_t   p_oppid;         /* Save parent pid during ptrace. XXX */
 147         int     p_dupfd;         /* Sideways return value from fdopen. XXX */
 148
 149         /* scheduling */
 150         u_int   p_estcpu;        /* Time averaged value of p_cpticks. */
 151         int     p_cpticks;       /* Ticks of cpu time. */
 152         fixpt_t p_pctcpu;        /* %cpu for this process during p_swtime */
 153         void    *p_wchan;        /* Sleep address. */
 154         char    *p_wmesg;        /* Reason for sleep. */
 155         u_int   p_swtime;        /* DEPRECATED (Time swapped in or out.) */
 156 #define p_argslen p_swtime       /* Length of process arguments. */
 157         u_int   p_slptime;       /* Time since last blocked. */
 158
 159         struct  itimerval p_realtimer;  /* Alarm timer. */
 160         struct  timeval p_rtime;        /* Real time. */
 161         u_quad_t p_uticks;              /* Statclock hits in user mode. */
 162         u_quad_t p_sticks;              /* Statclock hits in system mode. */
 163         u_quad_t p_iticks;              /* Statclock hits processing intr. */
 164
 165         int     p_traceflag;            /* Kernel trace points. */
 166         struct  vnode *p_tracep;        /* Trace to vnode. */
 167
 168         sigset_t p_siglist;             /* DEPRECATED. */
 169
 170         struct  vnode *p_textvp;        /* Vnode of executable. */
 171
 172 /* End area that is zeroed on creation. */
 173 #define p_endzero       p_hash.le_next
 174
 175         /*
 176          * Not copied, not zero'ed.
 177          * Belongs after p_pid, but here to avoid shifting proc elements.
 178          */
 179         LIST_ENTRY(proc) p_hash;        /* Hash chain. */
 180         TAILQ_HEAD( ,eventqelt) p_evlist;
 181
 182 /* The following fields are all copied upon creation in fork. */
 183 #define p_startcopy     p_sigmask
 184
 185         sigset_t p_sigmask;             /* DEPRECATED */
 186         sigset_t p_sigignore;   /* Signals being ignored. */
 187         sigset_t p_sigcatch;    /* Signals being caught by user. */
 188
 189         u_char  p_priority;     /* Process priority. */
 190         u_char  p_usrpri;       /* User-priority based on p_cpu and p_nice. */
 191         char    p_nice;         /* Process "nice" value. */
 192         char    p_comm[MAXCOMLEN+1];
 193         char    p_name[(2*MAXCOMLEN)+1];
 194
 195         struct  pgrp *p_pgrp;   /* Pointer to process group. */
 196
 197 /* End area that is copied on creation. */
 198 #define p_endcopy       p_xstat
 199
 200         u_short p_xstat;        /* Exit status for wait; also stop signal. */
 201         u_short p_acflag;       /* Accounting flags. */
 202         struct  rusage *p_ru;   /* Exit information. XXX */
 203
 204         int     p_debugger;     /* 1: can exec set-bit programs if suser */
 205
 206         void    *task;                  /* corresponding task */
 207         void    *sigwait_thread;        /* 'thread' holding sigwait */
 208         char    signal_lock[72];
 209         boolean_t        sigwait;       /* indication to suspend */
 210         void    *exit_thread;           /* Which thread is exiting? */
 211         user_addr_t user_stack;         /* where user stack was allocated */
 212         void * exitarg;                 /* exit arg for proc terminate */
 213         void * vm_shm;                  /* for sysV shared memory */
 214         int  p_argc;                    /* saved argc for sysctl_procargs() */
 215         int             p_vforkcnt;             /* number of outstanding vforks */
 216     void *  p_vforkact;     /* activation running this vfork proc */
 217         TAILQ_HEAD( , uthread) p_uthlist; /* List of uthreads  */
 218         /* Following fields are info from SIGCHLD */
 219         pid_t   si_pid;
 220         u_short si_status;
 221         u_short si_code;
 222         uid_t   si_uid;
 223         TAILQ_HEAD( , aio_workq_entry ) aio_activeq; /* active async IO requests */
 224         int             aio_active_count;       /* entries on aio_activeq */
 225         TAILQ_HEAD( , aio_workq_entry ) aio_doneq;       /* completed async IO requests */
 226         int             aio_done_count;         /* entries on aio_doneq */
 227
 228         struct klist p_klist;  /* knote list */
 229         lck_mtx_t       p_mlock;        /* proc lock to protect evques */
 230         lck_mtx_t       p_fdmlock;      /* proc lock to protect evques */
 231         unsigned int p_fdlock_pc[4];
 232         unsigned int p_fdunlock_pc[4];
 233         int             p_fpdrainwait;
 234         unsigned int            p_lflag;                /* local flags */
 235         unsigned int            p_ladvflag;             /* local adv flags*/
 236         unsigned int            p_internalref;  /* temp refcount field */
 237 #if DIAGNOSTIC
 238 #if SIGNAL_DEBUG
 239         unsigned int lockpc[8];
 240         unsigned int unlockpc[8];
 241 #endif /* SIGNAL_DEBUG */
 242 #endif /* DIAGNOSTIC */
 243 };
 244
 245
 246 /* local flags */
 247 #define P_LDELAYTERM            0x1     /* */
 248 #define P_LNOZOMB               0x2     /* */
 249 #define P_LLOW_PRI_IO           0x4
 250 #define P_LPEXIT                0x8
 251 #define P_LBACKGROUND_IO        0x10
 252 #define P_LWAITING              0x20
 253 #define P_LREFDRAIN             0x40
 254 #define P_LREFDRAINWAIT         0x80
 255 #define P_LREFDEAD              0x100
 256 #define P_LTHSIGSTACK   0x200
 257
 258 /* advisory flags in the proc */
 259 #define P_LADVLOCK              0x01
 260
 261 // LP64todo - should this move?
 262 /* LP64 version of extern_proc.  all pointers
 263  * grow when we're dealing with a 64-bit process.
 264  * WARNING - keep in sync with extern_proc
 265  * but use native alignment of 64-bit process.
 266  */
 267
 268 #ifdef KERNEL
 269 #include <sys/time.h>   /* user_timeval, user_itimerval */
 270
 271 struct user_extern_proc {
 272         union {
 273                 struct {
 274                         user_addr_t __p_forw;   /* Doubly-linked run/sleep queue. */
 275                         user_addr_t __p_back;
 276                 } p_st1;
 277                 struct user_timeval __p_starttime;      /* process start time */
 278         } p_un;
 279         user_addr_t     p_vmspace;      /* Address space. */
 280         user_addr_t             p_sigacts;      /* Signal actions, state (PROC ONLY). */
 281         int             p_flag;                 /* P_* flags. */
 282         char    p_stat;                 /* S* process status. */
 283         pid_t   p_pid;                  /* Process identifier. */
 284         pid_t   p_oppid;                /* Save parent pid during ptrace. XXX */
 285         int             p_dupfd;                /* Sideways return value from fdopen. XXX */
 286         /* Mach related  */
 287         user_addr_t user_stack __attribute((aligned(8)));       /* where user stack was allocated */
 288         user_addr_t exit_thread;  /* XXX Which thread is exiting? */
 289         int             p_debugger;             /* allow to debug */
 290         boolean_t       sigwait;        /* indication to suspend */
 291         /* scheduling */
 292         u_int   p_estcpu;        /* Time averaged value of p_cpticks. */
 293         int             p_cpticks;       /* Ticks of cpu time. */
 294         fixpt_t p_pctcpu;        /* %cpu for this process during p_swtime */
 295         user_addr_t     p_wchan __attribute((aligned(8)));       /* Sleep address. */
 296         user_addr_t     p_wmesg;         /* Reason for sleep. */
 297         u_int   p_swtime;        /* Time swapped in or out. */
 298         u_int   p_slptime;       /* Time since last blocked. */
 299         struct  user_itimerval p_realtimer;     /* Alarm timer. */
 300         struct  user_timeval p_rtime;   /* Real time. */
 301         u_quad_t p_uticks;              /* Statclock hits in user mode. */
 302         u_quad_t p_sticks;              /* Statclock hits in system mode. */
 303         u_quad_t p_iticks;              /* Statclock hits processing intr. */
 304         int             p_traceflag;            /* Kernel trace points. */
 305         user_addr_t     p_tracep __attribute((aligned(8)));     /* Trace to vnode. */
 306         int             p_siglist;              /* DEPRECATED */
 307         user_addr_t     p_textvp __attribute((aligned(8)));     /* Vnode of executable. */
 308         int             p_holdcnt;              /* If non-zero, don't swap. */
 309         sigset_t p_sigmask;     /* DEPRECATED. */
 310         sigset_t p_sigignore;   /* Signals being ignored. */
 311         sigset_t p_sigcatch;    /* Signals being caught by user. */
 312         u_char  p_priority;     /* Process priority. */
 313         u_char  p_usrpri;       /* User-priority based on p_cpu and p_nice. */
 314         char    p_nice;         /* Process "nice" value. */
 315         char    p_comm[MAXCOMLEN+1];
 316         user_addr_t     p_pgrp __attribute((aligned(8)));       /* Pointer to process group. */
 317         user_addr_t     p_addr; /* Kernel virtual addr of u-area (PROC ONLY). */
 318         u_short p_xstat;        /* Exit status for wait; also stop signal. */
 319         u_short p_acflag;       /* Accounting flags. */
 320         user_addr_t     p_ru __attribute((aligned(8))); /* Exit information. XXX */
 321 };
 322 #endif  /* KERNEL */
 323
 324 /*
 325  * We use process IDs <= PID_MAX; PID_MAX + 1 must also fit in a pid_t,
 326  * as it is used to represent "no process group".
 327  */
 328 extern int nprocs, maxproc;             /* Current and max number of procs. */
 329 extern int maxprocperuid;               /* Current number of procs per uid */
 330 __private_extern__ int hard_maxproc;    /* hard limit */
 331
 332 #define PID_MAX         30000
 333 #define NO_PID          30001
 334
 335 #define SESS_LEADER(p)  ((p)->p_session->s_leader == (p))
 336 #define SESSHOLD(s)     ((s)->s_count++)
 337 #define SESSRELE(s)     sessrele(s)
 338
 339 #define PIDHASH(pid)    (&pidhashtbl[(pid) & pidhash])
 340 extern LIST_HEAD(pidhashhead, proc) *pidhashtbl;
 341 extern u_long pidhash;
 342
 343 #define PGRPHASH(pgid)  (&pgrphashtbl[(pgid) & pgrphash])
 344 extern LIST_HEAD(pgrphashhead, pgrp) *pgrphashtbl;
 345 extern u_long pgrphash;
 346 extern lck_grp_t * proc_lck_grp;
 347 extern lck_grp_attr_t * proc_lck_grp_attr;
 348 extern lck_attr_t * proc_lck_attr;
 349
 350 LIST_HEAD(proclist, proc);
 351 extern struct proclist allproc;         /* List of all processes. */
 352 extern struct proclist zombproc;        /* List of zombie processes. */
 353 extern struct proc *initproc;
 354 extern void     pgdelete(struct pgrp *pgrp);
 355 extern void     sessrele(struct session *sess);
 356 extern void     procinit(void);
 357 extern void proc_lock(struct proc *);
 358 extern void proc_unlock(struct proc *);
 359 extern void proc_fdlock(struct proc *);
 360 extern void proc_fdunlock(struct proc *);
 361 __private_extern__ char *proc_core_name(const char *name, uid_t uid, pid_t pid);
 362 extern int isinferior(struct proc *, struct proc *);
 363 extern struct   proc *pfind(pid_t);     /* Find process by id. */
 364 __private_extern__ struct proc *pzfind(pid_t);  /* Find zombie by id. */
 365 extern struct   pgrp *pgfind(pid_t);    /* Find process group by id. */
 366
 367 extern int      chgproccnt(uid_t uid, int diff);
 368 extern int      enterpgrp(struct proc *p, pid_t pgid, int mksess);
 369 extern void     fixjobc(struct proc *p, struct pgrp *pgrp, int entering);
 370 extern int      inferior(struct proc *p);
 371 extern int      leavepgrp(struct proc *p);
 372 extern void     resetpriority(struct proc *);
 373 extern void     setrunnable(struct proc *);
 374 extern void     setrunqueue(struct proc *);
 375 extern int      sleep(void *chan, int pri);
 376 extern int      tsleep0(void *chan, int pri, const char *wmesg, int timo, int (*continuation)(int));
 377 extern int      tsleep1(void *chan, int pri, const char *wmesg, u_int64_t abstime, int (*continuation)(int));
 378 extern int      msleep0(void *chan, lck_mtx_t *mtx, int pri, const char *wmesg, int timo, int (*continuation)(int));
 379 extern void     vfork_return(thread_t th_act, struct proc *p, struct proc *p2, register_t *retval);
 380 extern struct proc * proc_findref(pid_t pid);
 381 extern void  proc_dropref(struct proc *  p);
 382 extern struct proc * proc_refinternal(proc_t  p, int funneled);
 383 extern void  proc_dropinternal(struct proc *  p, int funneled);
 384
 385 #endif  /* !_SYS_PROC_INTERNAL_H_ */