bsd/sys/proc.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, 1997 Apple Computer, Inc. All Rights Reserved */
  23 /*-
  24  * Copyright (c) 1986, 1989, 1991, 1993
  25  *      The Regents of the University of California.  All rights reserved.
  26  * (c) UNIX System Laboratories, Inc.
  27  * All or some portions of this file are derived from material licensed
  28  * to the University of California by American Telephone and Telegraph
  29  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
  30  * the permission of UNIX System Laboratories, Inc.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  * 3. All advertising materials mentioning features or use of this software
  41  *    must display the following acknowledgement:
  42  *      This product includes software developed by the University of
  43  *      California, Berkeley and its contributors.
  44  * 4. Neither the name of the University nor the names of its contributors
  45  *    may be used to endorse or promote products derived from this software
  46  *    without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  58  * SUCH DAMAGE.
  59  *
  60  *      @(#)proc.h      8.15 (Berkeley) 5/19/95
  61  */
  62
  63 #ifndef _SYS_PROC_H_
  64 #define _SYS_PROC_H_
  65
  66 #include <sys/cdefs.h>
  67
  68 #include <sys/select.h>                 /* For struct selinfo. */
  69 #include <sys/queue.h>
  70 #include <sys/lock.h>
  71 #include <sys/param.h>
  72
  73 /*
  74  * One structure allocated per session.
  75  */
  76 struct  session {
  77         int     s_count;                /* Ref cnt; pgrps in session. */
  78         struct  proc *s_leader;         /* Session leader. */
  79         struct  vnode *s_ttyvp;         /* Vnode of controlling terminal. */
  80         struct  tty *s_ttyp;            /* Controlling terminal. */
  81         char    s_login[MAXLOGNAME];    /* Setlogin() name. */
  82 };
  83
  84 /*
  85  * One structure allocated per process group.
  86  */
  87 struct  pgrp {
  88         LIST_ENTRY(pgrp) pg_hash;       /* Hash chain. */
  89         LIST_HEAD(, proc) pg_members;   /* Pointer to pgrp members. */
  90         struct  session *pg_session;    /* Pointer to session. */
  91         pid_t   pg_id;                  /* Pgrp id. */
  92         int     pg_jobc;        /* # procs qualifying pgrp for job control */
  93 };
  94
  95 /*
  96  * Description of a process.
  97  *
  98  * This structure contains the information needed to manage a thread of
  99  * control, known in UN*X as a process; it has references to substructures
 100  * containing descriptions of things that the process uses, but may share
 101  * with related processes.  The process structure and the substructures
 102  * are always addressible except for those marked "(PROC ONLY)" below,
 103  * which might be addressible only on a processor on which the process
 104  * is running.
 105  */
 106 struct  proc {
 107         LIST_ENTRY(proc) p_list;        /* List of all processes. */
 108
 109         /* substructures: */
 110         struct  pcred *p_cred;          /* Process owner's identity. */
 111         struct  filedesc *p_fd;         /* Ptr to open files structure. */
 112         struct  pstats *p_stats;        /* Accounting/statistics (PROC ONLY). */
 113         struct  plimit *p_limit;        /* Process limits. */
 114         struct  sigacts *p_sigacts;     /* Signal actions, state (PROC ONLY). */
 115
 116 #define p_ucred         p_cred->pc_ucred
 117 #define p_rlimit        p_limit->pl_rlimit
 118
 119         int     p_flag;                 /* P_* flags. */
 120         char    p_stat;                 /* S* process status. */
 121         char    p_pad1[3];
 122
 123         pid_t   p_pid;                  /* Process identifier. */
 124         LIST_ENTRY(proc) p_pglist;      /* List of processes in pgrp. */
 125         struct  proc *p_pptr;           /* Pointer to parent process. */
 126         LIST_ENTRY(proc) p_sibling;     /* List of sibling processes. */
 127         LIST_HEAD(, proc) p_children;   /* Pointer to list of children. */
 128
 129 /* The following fields are all zeroed upon creation in fork. */
 130 #define p_startzero     p_oppid
 131
 132         pid_t   p_oppid;         /* Save parent pid during ptrace. XXX */
 133         int     p_dupfd;         /* Sideways return value from fdopen. XXX */
 134
 135         /* scheduling */
 136         u_int   p_estcpu;        /* Time averaged value of p_cpticks. */
 137         int     p_cpticks;       /* Ticks of cpu time. */
 138         fixpt_t p_pctcpu;        /* %cpu for this process during p_swtime */
 139         void    *p_wchan;        /* Sleep address. */
 140         char    *p_wmesg;        /* Reason for sleep. */
 141         u_int   p_swtime;        /* Time swapped in or out. */
 142         u_int   p_slptime;       /* Time since last blocked. */
 143
 144         struct  itimerval p_realtimer;  /* Alarm timer. */
 145         struct  timeval p_rtime;        /* Real time. */
 146         u_quad_t p_uticks;              /* Statclock hits in user mode. */
 147         u_quad_t p_sticks;              /* Statclock hits in system mode. */
 148         u_quad_t p_iticks;              /* Statclock hits processing intr. */
 149
 150         int     p_traceflag;            /* Kernel trace points. */
 151         struct  vnode *p_tracep;        /* Trace to vnode. */
 152
 153         sigset_t p_siglist;             /* Signals arrived but not delivered. */
 154
 155         struct  vnode *p_textvp;        /* Vnode of executable. */
 156
 157 /* End area that is zeroed on creation. */
 158 #define p_endzero       p_hash.le_next
 159
 160         /*
 161          * Not copied, not zero'ed.
 162          * Belongs after p_pid, but here to avoid shifting proc elements.
 163          */
 164         LIST_ENTRY(proc) p_hash;        /* Hash chain. */
 165         TAILQ_HEAD( ,eventqelt) p_evlist;
 166
 167 /* The following fields are all copied upon creation in fork. */
 168 #define p_startcopy     p_sigmask
 169
 170         sigset_t p_sigmask;     /* Current signal mask. */
 171         sigset_t p_sigignore;   /* Signals being ignored. */
 172         sigset_t p_sigcatch;    /* Signals being caught by user. */
 173
 174         u_char  p_priority;     /* Process priority. */
 175         u_char  p_usrpri;       /* User-priority based on p_cpu and p_nice. */
 176         char    p_nice;         /* Process "nice" value. */
 177         char    p_comm[MAXCOMLEN+1];
 178
 179         struct  pgrp *p_pgrp;   /* Pointer to process group. */
 180
 181 /* End area that is copied on creation. */
 182 #define p_endcopy       p_xstat
 183
 184         u_short p_xstat;        /* Exit status for wait; also stop signal. */
 185         u_short p_acflag;       /* Accounting flags. */
 186         struct  rusage *p_ru;   /* Exit information. XXX */
 187
 188         int     p_debugger;     /* 1: can exec set-bit programs if suser */
 189
 190         void    *task;                  /* corresponding task */
 191         void    *sigwait_thread;        /* 'thread' holding sigwait */
 192         struct lock__bsd__ signal_lock; /* multilple thread prot for signals*/
 193         boolean_t        sigwait;       /* indication to suspend */
 194         void    *exit_thread;           /* Which thread is exiting? */
 195         caddr_t user_stack;             /* where user stack was allocated */
 196         void * exitarg;                 /* exit arg for proc terminate */
 197         void * vm_shm;                  /* for sysV shared memory */
 198         sigset_t p_sigpending;  /* pended Signals as traced process is blocked. */
 199         int             p_vforkcnt;             /* number of outstanding vforks */
 200     void *  p_vforkact;     /* activation running this vfork proc */
 201 #if DIAGNOSTIC
 202 #if SIGNAL_DEBUG
 203         unsigned int lockpc[8];
 204         unsigned int unlockpc[8];
 205 #endif /* SIGNAL_DEBUG */
 206 #endif /* DIAGNOSTIC */
 207 };
 208
 209 /* Exported fields for kern sysctls */
 210 struct extern_proc {
 211         struct  proc *p_forw;           /* Doubly-linked run/sleep queue. */
 212         struct  proc *p_back;
 213         struct  vmspace *p_vmspace;     /* Address space. */
 214         struct  sigacts *p_sigacts;     /* Signal actions, state (PROC ONLY). */
 215         int     p_flag;                 /* P_* flags. */
 216         char    p_stat;                 /* S* process status. */
 217         pid_t   p_pid;                  /* Process identifier. */
 218         pid_t   p_oppid;         /* Save parent pid during ptrace. XXX */
 219         int     p_dupfd;         /* Sideways return value from fdopen. XXX */
 220         /* Mach related  */
 221         caddr_t user_stack;     /* where user stack was allocated */
 222         void    *exit_thread;   /* XXX Which thread is exiting? */
 223         int             p_debugger;             /* allow to debug */
 224         boolean_t       sigwait;        /* indication to suspend */
 225         /* scheduling */
 226         u_int   p_estcpu;        /* Time averaged value of p_cpticks. */
 227         int     p_cpticks;       /* Ticks of cpu time. */
 228         fixpt_t p_pctcpu;        /* %cpu for this process during p_swtime */
 229         void    *p_wchan;        /* Sleep address. */
 230         char    *p_wmesg;        /* Reason for sleep. */
 231         u_int   p_swtime;        /* Time swapped in or out. */
 232         u_int   p_slptime;       /* Time since last blocked. */
 233         struct  itimerval p_realtimer;  /* Alarm timer. */
 234         struct  timeval p_rtime;        /* Real time. */
 235         u_quad_t p_uticks;              /* Statclock hits in user mode. */
 236         u_quad_t p_sticks;              /* Statclock hits in system mode. */
 237         u_quad_t p_iticks;              /* Statclock hits processing intr. */
 238         int     p_traceflag;            /* Kernel trace points. */
 239         struct  vnode *p_tracep;        /* Trace to vnode. */
 240         int     p_siglist;              /* Signals arrived but not delivered. */
 241         struct  vnode *p_textvp;        /* Vnode of executable. */
 242         int     p_holdcnt;              /* If non-zero, don't swap. */
 243         sigset_t p_sigmask;     /* Current signal mask. */
 244         sigset_t p_sigignore;   /* Signals being ignored. */
 245         sigset_t p_sigcatch;    /* Signals being caught by user. */
 246         u_char  p_priority;     /* Process priority. */
 247         u_char  p_usrpri;       /* User-priority based on p_cpu and p_nice. */
 248         char    p_nice;         /* Process "nice" value. */
 249         char    p_comm[MAXCOMLEN+1];
 250         struct  pgrp *p_pgrp;   /* Pointer to process group. */
 251         struct  user *p_addr;   /* Kernel virtual addr of u-area (PROC ONLY). */
 252         u_short p_xstat;        /* Exit status for wait; also stop signal. */
 253         u_short p_acflag;       /* Accounting flags. */
 254         struct  rusage *p_ru;   /* Exit information. XXX */
 255 };
 256
 257 #define p_session       p_pgrp->pg_session
 258 #define p_pgid          p_pgrp->pg_id
 259
 260 /* Status values. */
 261 #define SIDL    1               /* Process being created by fork. */
 262 #define SRUN    2               /* Currently runnable. */
 263 #define SSLEEP  3               /* Sleeping on an address. */
 264 #define SSTOP   4               /* Process debugging or suspension. */
 265 #define SZOMB   5               /* Awaiting collection by parent. */
 266
 267 /* These flags are kept in p_flags. */
 268 #define P_ADVLOCK       0x00001 /* Process may hold a POSIX advisory lock. */
 269 #define P_CONTROLT      0x00002 /* Has a controlling terminal. */
 270 #define P_INMEM         0x00004 /* Loaded into memory. */
 271 #define P_NOCLDSTOP     0x00008 /* No SIGCHLD when children stop. */
 272 #define P_PPWAIT        0x00010 /* Parent is waiting for child to exec/exit. */
 273 #define P_PROFIL        0x00020 /* Has started profiling. */
 274 #define P_SELECT        0x00040 /* Selecting; wakeup/waiting danger. */
 275 #define P_SINTR         0x00080 /* Sleep is interruptible. */
 276 #define P_SUGID         0x00100 /* Had set id privileges since last exec. */
 277 #define P_SYSTEM        0x00200 /* System proc: no sigs, stats or swapping. */
 278 #define P_TIMEOUT       0x00400 /* Timing out during sleep. */
 279 #define P_TRACED        0x00800 /* Debugged process being traced. */
 280 #define P_WAITED        0x01000 /* Debugging process has waited for child. */
 281 #define P_WEXIT         0x02000 /* Working on exiting. */
 282 #define P_EXEC          0x04000 /* Process called exec. */
 283
 284 /* Should probably be changed into a hold count. */
 285 #define P_NOSWAP        0x08000 /* Another flag to prevent swap out. */
 286 #define P_PHYSIO        0x10000 /* Doing physical I/O. */
 287
 288 /* Should be moved to machine-dependent areas. */
 289 #define P_OWEUPC        0x08000 /* Owe process an addupc() call at next ast. */
 290
 291 /* XXX Not sure what to do with these, yet. */
 292 #define P_FSTRACE       0x10000 /* tracing via file system (elsewhere?) */
 293 #define P_SSTEP         0x20000 /* process needs single-step fixup ??? */
 294
 295 #define P_WAITING       0x0040000       /* process has a wait() in progress */
 296 #define P_KDEBUG        0x0080000       /* kdebug tracing is on for this process */
 297 #define P_TTYSLEEP      0x0100000       /* blocked due to SIGTTOU or SIGTTIN */
 298 #define P_REBOOT        0x0200000       /* Process called reboot() */
 299 #define P_TBE           0x0400000       /* Process is TBE */
 300 #define P_SIGTHR        0x0800000       /* signal pending handling thread scheduled */
 301 #define P_BTRACE        0x1000000       /* process is being branch traced */
 302 #define P_VFORK         0x2000000       /* process has vfork children */
 303 #define P_NOATTACH      0x4000000
 304 #define P_INVFORK       0x8000000       /* proc in vfork */
 305
 306
 307 /*
 308  * Shareable process credentials (always resident).  This includes a reference
 309  * to the current user credentials as well as real and saved ids that may be
 310  * used to change ids.
 311  */
 312 struct  pcred {
 313         struct  lock__bsd__ pc_lock;
 314         struct  ucred *pc_ucred;        /* Current credentials. */
 315         uid_t   p_ruid;                 /* Real user id. */
 316         uid_t   p_svuid;                /* Saved effective user id. */
 317         gid_t   p_rgid;                 /* Real group id. */
 318         gid_t   p_svgid;                /* Saved effective group id. */
 319         int     p_refcnt;               /* Number of references. */
 320 };
 321
 322 #define pcred_readlock(p)       lockmgr(&(p)->p_cred->pc_lock,          \
 323                                                 LK_SHARED, 0, (p))
 324 #define pcred_writelock(p)      lockmgr(&(p)->p_cred->pc_lock,          \
 325                                                 LK_EXCLUSIVE, 0, (p))
 326 #define pcred_unlock(p)         lockmgr(&(p)->p_cred->pc_lock,          \
 327                                                 LK_RELEASE, 0, (p))
 328
 329 #ifdef KERNEL
 330
 331 __BEGIN_DECLS
 332 /*
 333  * We use process IDs <= PID_MAX; PID_MAX + 1 must also fit in a pid_t,
 334  * as it is used to represent "no process group".
 335  */
 336 #define PID_MAX         30000
 337 #define NO_PID          30001
 338
 339 #define SESS_LEADER(p)  ((p)->p_session->s_leader == (p))
 340 #define SESSHOLD(s)     ((s)->s_count++)
 341 #define SESSRELE(s)     sessrele(s)
 342
 343 #define PIDHASH(pid)    (&pidhashtbl[(pid) & pidhash])
 344 extern LIST_HEAD(pidhashhead, proc) *pidhashtbl;
 345 extern u_long pidhash;
 346
 347 #define PGRPHASH(pgid)  (&pgrphashtbl[(pgid) & pgrphash])
 348 extern LIST_HEAD(pgrphashhead, pgrp) *pgrphashtbl;
 349 extern u_long pgrphash;
 350
 351 extern int nprocs, maxproc;             /* Current and max number of procs. */
 352
 353 LIST_HEAD(proclist, proc);
 354 extern struct proclist allproc;         /* List of all processes. */
 355 extern struct proclist zombproc;        /* List of zombie processes. */
 356 extern struct proc *initproc, *kernproc;
 357
 358 extern struct   proc *pfind __P((pid_t));       /* Find process by id. */
 359 extern struct   pgrp *pgfind __P((pid_t));      /* Find process group by id. */
 360
 361 extern int      chgproccnt __P((uid_t uid, int diff));
 362 extern int      enterpgrp __P((struct proc *p, pid_t pgid, int mksess));
 363 extern void     fixjobc __P((struct proc *p, struct pgrp *pgrp, int entering));
 364 extern int      inferior __P((struct proc *p));
 365 extern int      leavepgrp __P((struct proc *p));
 366 extern void     mi_switch __P((void));
 367 extern void     pgdelete __P((struct pgrp *pgrp));
 368 extern void     sessrele __P((struct session *sess));
 369 extern void     procinit __P((void));
 370 extern void     resetpriority __P((struct proc *));
 371 extern void     setrunnable __P((struct proc *));
 372 extern void     setrunqueue __P((struct proc *));
 373 extern int      sleep __P((void *chan, int pri));
 374 extern int      tsleep __P((void *chan, int pri, char *wmesg, int timo));
 375 extern int      tsleep0 __P((void *chan, int pri, char *wmesg, int timo, int (*continuation)(int) ));
 376 extern void     unsleep __P((struct proc *));
 377 extern void     wakeup __P((void *chan));
 378 __END_DECLS
 379
 380 #endif  /* KERNEL */
 381
 382 #endif  /* !_SYS_PROC_H_ */