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Annotation of kernel/bsd/sys/proc.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /* Copyright (c) 1995, 1997 Apple Computer, Inc. All Rights Reserved */
        !            26: /*-
        !            27:  * Copyright (c) 1986, 1989, 1991, 1993
        !            28:  *     The Regents of the University of California.  All rights reserved.
        !            29:  * (c) UNIX System Laboratories, Inc.
        !            30:  * All or some portions of this file are derived from material licensed
        !            31:  * to the University of California by American Telephone and Telegraph
        !            32:  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
        !            33:  * the permission of UNIX System Laboratories, Inc.
        !            34:  *
        !            35:  * Redistribution and use in source and binary forms, with or without
        !            36:  * modification, are permitted provided that the following conditions
        !            37:  * are met:
        !            38:  * 1. Redistributions of source code must retain the above copyright
        !            39:  *    notice, this list of conditions and the following disclaimer.
        !            40:  * 2. Redistributions in binary form must reproduce the above copyright
        !            41:  *    notice, this list of conditions and the following disclaimer in the
        !            42:  *    documentation and/or other materials provided with the distribution.
        !            43:  * 3. All advertising materials mentioning features or use of this software
        !            44:  *    must display the following acknowledgement:
        !            45:  *     This product includes software developed by the University of
        !            46:  *     California, Berkeley and its contributors.
        !            47:  * 4. Neither the name of the University nor the names of its contributors
        !            48:  *    may be used to endorse or promote products derived from this software
        !            49:  *    without specific prior written permission.
        !            50:  *
        !            51:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            52:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            53:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            54:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            55:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            56:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            57:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            58:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            59:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            60:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            61:  * SUCH DAMAGE.
        !            62:  *
        !            63:  *     @(#)proc.h      8.15 (Berkeley) 5/19/95
        !            64:  */
        !            65: 
        !            66: #ifndef _SYS_PROC_H_
        !            67: #define        _SYS_PROC_H_
        !            68: 
        !            69: #include <sys/select.h>                        /* For struct selinfo. */
        !            70: #include <sys/queue.h>
        !            71: #include <sys/lock.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:        simple_lock_data_t siglock;     /* multiple thread signal lock */
        !           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: };
        !           197: 
        !           198: /* Exported fields for kern sysctls */
        !           199: struct extern_proc {
        !           200:        struct  proc *p_forw;           /* Doubly-linked run/sleep queue. */
        !           201:        struct  proc *p_back;
        !           202:        struct  vmspace *p_vmspace;     /* Address space. */
        !           203:        struct  sigacts *p_sigacts;     /* Signal actions, state (PROC ONLY). */
        !           204:        int     p_flag;                 /* P_* flags. */
        !           205:        char    p_stat;                 /* S* process status. */
        !           206:        pid_t   p_pid;                  /* Process identifier. */
        !           207:        pid_t   p_oppid;         /* Save parent pid during ptrace. XXX */
        !           208:        int     p_dupfd;         /* Sideways return value from fdopen. XXX */
        !           209:        /* Mach related  */
        !           210:        caddr_t user_stack;     /* where user stack was allocated */
        !           211:        void    *exit_thread;   /* XXX Which thread is exiting? */
        !           212:        int             p_debugger;             /* allow to debug */
        !           213:        boolean_t       sigwait;        /* indication to suspend */
        !           214:        /* scheduling */
        !           215:        u_int   p_estcpu;        /* Time averaged value of p_cpticks. */
        !           216:        int     p_cpticks;       /* Ticks of cpu time. */
        !           217:        fixpt_t p_pctcpu;        /* %cpu for this process during p_swtime */
        !           218:        void    *p_wchan;        /* Sleep address. */
        !           219:        char    *p_wmesg;        /* Reason for sleep. */
        !           220:        u_int   p_swtime;        /* Time swapped in or out. */
        !           221:        u_int   p_slptime;       /* Time since last blocked. */
        !           222:        struct  itimerval p_realtimer;  /* Alarm timer. */
        !           223:        struct  timeval p_rtime;        /* Real time. */
        !           224:        u_quad_t p_uticks;              /* Statclock hits in user mode. */
        !           225:        u_quad_t p_sticks;              /* Statclock hits in system mode. */
        !           226:        u_quad_t p_iticks;              /* Statclock hits processing intr. */
        !           227:        int     p_traceflag;            /* Kernel trace points. */
        !           228:        struct  vnode *p_tracep;        /* Trace to vnode. */
        !           229:        int     p_siglist;              /* Signals arrived but not delivered. */
        !           230:        struct  vnode *p_textvp;        /* Vnode of executable. */
        !           231:        int     p_holdcnt;              /* If non-zero, don't swap. */
        !           232:        sigset_t p_sigmask;     /* Current signal mask. */
        !           233:        sigset_t p_sigignore;   /* Signals being ignored. */
        !           234:        sigset_t p_sigcatch;    /* Signals being caught by user. */
        !           235:        u_char  p_priority;     /* Process priority. */
        !           236:        u_char  p_usrpri;       /* User-priority based on p_cpu and p_nice. */
        !           237:        char    p_nice;         /* Process "nice" value. */
        !           238:        char    p_comm[MAXCOMLEN+1];
        !           239:        struct  pgrp *p_pgrp;   /* Pointer to process group. */
        !           240:        struct  user *p_addr;   /* Kernel virtual addr of u-area (PROC ONLY). */
        !           241:        u_short p_xstat;        /* Exit status for wait; also stop signal. */
        !           242:        u_short p_acflag;       /* Accounting flags. */
        !           243:        struct  rusage *p_ru;   /* Exit information. XXX */
        !           244: };
        !           245: 
        !           246: #define        p_session       p_pgrp->pg_session
        !           247: #define        p_pgid          p_pgrp->pg_id
        !           248: 
        !           249: /* Status values. */
        !           250: #define        SIDL    1               /* Process being created by fork. */
        !           251: #define        SRUN    2               /* Currently runnable. */
        !           252: #define        SSLEEP  3               /* Sleeping on an address. */
        !           253: #define        SSTOP   4               /* Process debugging or suspension. */
        !           254: #define        SZOMB   5               /* Awaiting collection by parent. */
        !           255: 
        !           256: /* These flags are kept in p_flags. */
        !           257: #define        P_ADVLOCK       0x00001 /* Process may hold a POSIX advisory lock. */
        !           258: #define        P_CONTROLT      0x00002 /* Has a controlling terminal. */
        !           259: #define        P_INMEM         0x00004 /* Loaded into memory. */
        !           260: #define        P_NOCLDSTOP     0x00008 /* No SIGCHLD when children stop. */
        !           261: #define        P_PPWAIT        0x00010 /* Parent is waiting for child to exec/exit. */
        !           262: #define        P_PROFIL        0x00020 /* Has started profiling. */
        !           263: #define        P_SELECT        0x00040 /* Selecting; wakeup/waiting danger. */
        !           264: #define        P_SINTR         0x00080 /* Sleep is interruptible. */
        !           265: #define        P_SUGID         0x00100 /* Had set id privileges since last exec. */
        !           266: #define        P_SYSTEM        0x00200 /* System proc: no sigs, stats or swapping. */
        !           267: #define        P_TIMEOUT       0x00400 /* Timing out during sleep. */
        !           268: #define        P_TRACED        0x00800 /* Debugged process being traced. */
        !           269: #define        P_WAITED        0x01000 /* Debugging process has waited for child. */
        !           270: #define        P_WEXIT         0x02000 /* Working on exiting. */
        !           271: #define        P_EXEC          0x04000 /* Process called exec. */
        !           272: 
        !           273: /* Should probably be changed into a hold count. */
        !           274: #define        P_NOSWAP        0x08000 /* Another flag to prevent swap out. */
        !           275: #define        P_PHYSIO        0x10000 /* Doing physical I/O. */
        !           276: 
        !           277: /* Should be moved to machine-dependent areas. */
        !           278: #define        P_OWEUPC        0x08000 /* Owe process an addupc() call at next ast. */
        !           279: 
        !           280: /* XXX Not sure what to do with these, yet. */
        !           281: #define        P_FSTRACE       0x10000 /* tracing via file system (elsewhere?) */
        !           282: #define        P_SSTEP         0x20000 /* process needs single-step fixup ??? */
        !           283: 
        !           284: /*
        !           285:  * Shareable process credentials (always resident).  This includes a reference
        !           286:  * to the current user credentials as well as real and saved ids that may be
        !           287:  * used to change ids.
        !           288:  */
        !           289: struct pcred {
        !           290:        struct  lock__bsd__ pc_lock;
        !           291:        struct  ucred *pc_ucred;        /* Current credentials. */
        !           292:        uid_t   p_ruid;                 /* Real user id. */
        !           293:        uid_t   p_svuid;                /* Saved effective user id. */
        !           294:        gid_t   p_rgid;                 /* Real group id. */
        !           295:        gid_t   p_svgid;                /* Saved effective group id. */
        !           296:        int     p_refcnt;               /* Number of references. */
        !           297: };
        !           298: 
        !           299: #define pcred_readlock(p)      lockmgr(&(p)->p_cred->pc_lock,          \
        !           300:                                                LK_SHARED, 0, (p))
        !           301: #define pcred_writelock(p)     lockmgr(&(p)->p_cred->pc_lock,          \
        !           302:                                                LK_EXCLUSIVE, 0, (p))
        !           303: #define pcred_unlock(p)                lockmgr(&(p)->p_cred->pc_lock,          \
        !           304:                                                LK_RELEASE, 0, (p))
        !           305: 
        !           306: #ifdef _KERNEL
        !           307: /*
        !           308:  * We use process IDs <= PID_MAX; PID_MAX + 1 must also fit in a pid_t,
        !           309:  * as it is used to represent "no process group".
        !           310:  */
        !           311: #define        PID_MAX         30000
        !           312: #define        NO_PID          30001
        !           313: 
        !           314: #define SESS_LEADER(p) ((p)->p_session->s_leader == (p))
        !           315: #define        SESSHOLD(s)     ((s)->s_count++)
        !           316: #define        SESSRELE(s)     sessrele(s)
        !           317: 
        !           318: #define        PIDHASH(pid)    (&pidhashtbl[(pid) & pidhash])
        !           319: extern LIST_HEAD(pidhashhead, proc) *pidhashtbl;
        !           320: extern u_long pidhash;
        !           321: 
        !           322: #define        PGRPHASH(pgid)  (&pgrphashtbl[(pgid) & pgrphash])
        !           323: extern LIST_HEAD(pgrphashhead, pgrp) *pgrphashtbl;
        !           324: extern u_long pgrphash;
        !           325: 
        !           326: extern int nprocs, maxproc;            /* Current and max number of procs. */
        !           327: 
        !           328: LIST_HEAD(proclist, proc);
        !           329: extern struct proclist allproc;                /* List of all processes. */
        !           330: extern struct proclist zombproc;       /* List of zombie processes. */
        !           331: extern struct proc *initproc, *kernproc;
        !           332: 
        !           333: extern struct  proc *pfind __P((pid_t));       /* Find process by id. */
        !           334: extern struct  pgrp *pgfind __P((pid_t));      /* Find process group by id. */
        !           335: 
        !           336: extern int     chgproccnt __P((uid_t uid, int diff));
        !           337: extern int     enterpgrp __P((struct proc *p, pid_t pgid, int mksess));
        !           338: extern void    fixjobc __P((struct proc *p, struct pgrp *pgrp, int entering));
        !           339: extern int     inferior __P((struct proc *p));
        !           340: extern int     leavepgrp __P((struct proc *p));
        !           341: extern void    mi_switch __P((void));
        !           342: extern void    pgdelete __P((struct pgrp *pgrp));
        !           343: extern void    sessrele __P((struct session *sess));
        !           344: extern void    procinit __P((void));
        !           345: extern void    resetpriority __P((struct proc *));
        !           346: extern void    setrunnable __P((struct proc *));
        !           347: extern void    setrunqueue __P((struct proc *));
        !           348: extern int     sleep __P((void *chan, int pri));
        !           349: extern int     tsleep __P((void *chan, int pri, char *wmesg, int timo));
        !           350: extern void    unsleep __P((struct proc *));
        !           351: extern void    wakeup __P((void *chan));
        !           352: #endif /* _KERNEL */
        !           353: 
        !           354: #endif /* !_SYS_PROC_H_ */

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