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Annotation of Net2/sys/proc.h, revision 1.1

1.1     ! root        1: /*-
        !             2:  * Copyright (c) 1986, 1989, 1991 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  *
        !            33:  *     @(#)proc.h      7.28 (Berkeley) 5/30/91
        !            34:  */
        !            35: 
        !            36: #ifndef _PROC_H_
        !            37: #define        _PROC_H_
        !            38: 
        !            39: #include <machine/proc.h>              /* machine-dependent proc substruct */
        !            40: 
        !            41: /*
        !            42:  * One structure allocated per session.
        !            43:  */
        !            44: struct session {
        !            45:        int     s_count;                /* ref cnt; pgrps in session */
        !            46:        struct  proc *s_leader;         /* session leader */
        !            47:        struct  vnode *s_ttyvp;         /* vnode of controlling terminal */
        !            48:        struct  tty *s_ttyp;            /* controlling terminal */
        !            49:        char    s_login[MAXLOGNAME];    /* setlogin() name */
        !            50: };
        !            51: 
        !            52: /*
        !            53:  * One structure allocated per process group.
        !            54:  */
        !            55: struct pgrp {
        !            56:        struct  pgrp *pg_hforw;         /* forward link in hash bucket */
        !            57:        struct  proc *pg_mem;           /* pointer to pgrp members */
        !            58:        struct  session *pg_session;    /* pointer to session */
        !            59:        pid_t   pg_id;                  /* pgrp id */
        !            60:        int     pg_jobc;        /* # procs qualifying pgrp for job control */
        !            61: };
        !            62: 
        !            63: /*
        !            64:  * Description of a process.
        !            65:  * This structure contains the information needed to manage a thread
        !            66:  * of control, known in UN*X as a process; it has references to substructures
        !            67:  * containing descriptions of things that the process uses, but may share
        !            68:  * with related processes.  The process structure and the substructures
        !            69:  * are always addressible except for those marked "(PROC ONLY)" below,
        !            70:  * which might be addressible only on a processor on which the process
        !            71:  * is running.
        !            72:  */
        !            73: struct proc {
        !            74:        struct  proc *p_link;           /* doubly-linked run/sleep queue */
        !            75:        struct  proc *p_rlink;
        !            76:        struct  proc *p_nxt;            /* linked list of active procs */
        !            77:        struct  proc **p_prev;          /*    and zombies */
        !            78: 
        !            79:        /* substructures: */
        !            80:        struct  pcred *p_cred;          /* process owner's identity */
        !            81:        struct  filedesc *p_fd;         /* ptr to open files structure */
        !            82:        struct  pstats *p_stats;        /* accounting/statistics (PROC ONLY) */
        !            83:        struct  plimit *p_limit;        /* process limits */
        !            84:        struct  vmspace *p_vmspace;     /* address space */
        !            85:        struct  sigacts *p_sigacts;     /* signal actions, state (PROC ONLY) */
        !            86: 
        !            87: #define        p_ucred         p_cred->pc_ucred
        !            88: #define        p_rlimit        p_limit->pl_rlimit
        !            89: 
        !            90:        int     p_flag;
        !            91:        char    p_stat;
        !            92: /*     char    p_space; */
        !            93: 
        !            94:        pid_t   p_pid;          /* unique process id */
        !            95:        struct  proc *p_hash;   /* hashed based on p_pid for kill+exit+... */
        !            96:        struct  proc *p_pgrpnxt; /* pointer to next process in process group */
        !            97:        struct  proc *p_pptr;   /* pointer to process structure of parent */
        !            98:        struct  proc *p_osptr;  /* pointer to older sibling processes */
        !            99: 
        !           100: /* The following fields are all zeroed upon creation in fork */
        !           101: #define        p_startzero     p_ysptr
        !           102:        struct  proc *p_ysptr;  /* pointer to younger siblings */
        !           103:        struct  proc *p_cptr;   /* pointer to youngest living child */
        !           104: 
        !           105:        /* scheduling */
        !           106:        u_int   p_cpu;          /* cpu usage for scheduling */
        !           107:        int     p_cpticks;      /* ticks of cpu time */
        !           108:        fixpt_t p_pctcpu;       /* %cpu for this process during p_time */
        !           109:        caddr_t p_wchan;        /* event process is awaiting */
        !           110:        u_int   p_time;         /* resident/nonresident time for swapping */
        !           111:        u_int   p_slptime;      /* time since last block */
        !           112: 
        !           113:        struct  itimerval p_realtimer;  /* alarm timer */
        !           114:        struct  timeval p_utime;        /* user time */
        !           115:        struct  timeval p_stime;        /* system time */
        !           116: 
        !           117:        int     p_traceflag;    /* kernel trace points */
        !           118:        struct  vnode *p_tracep;/* trace to vnode */
        !           119: 
        !           120:        int     p_sig;          /* signals pending to this process */
        !           121: 
        !           122: /* end area that is zeroed on creation */
        !           123: #define        p_endzero       p_startcopy
        !           124: 
        !           125: /* The following fields are all copied upon creation in fork */
        !           126:        sigset_t p_sigmask;     /* current signal mask */
        !           127: #define        p_startcopy     p_sigmask
        !           128:        sigset_t p_sigignore;   /* signals being ignored */
        !           129:        sigset_t p_sigcatch;    /* signals being caught by user */
        !           130: 
        !           131:        u_char  p_pri;          /* priority, negative is high */
        !           132:        u_char  p_usrpri;       /* user-priority based on p_cpu and p_nice */
        !           133:        char    p_nice;         /* nice for cpu usage */
        !           134: /*     char    p_space1; */
        !           135: 
        !           136:        struct  pgrp *p_pgrp;   /* pointer to process group */
        !           137:        char    p_comm[MAXCOMLEN+1];
        !           138: 
        !           139: /* end area that is copied on creation */
        !           140: #define        p_endcopy       p_wmesg
        !           141:        char    *p_wmesg;       /* reason for sleep */
        !           142:        int     p_thread;       /* id for this "thread" (Mach glue) XXX */
        !           143:        struct  user *p_addr;   /* kernel virtual addr of u-area (PROC ONLY) */
        !           144:        swblk_t p_swaddr;       /* disk address of u area when swapped */
        !           145:        int     *p_regs;        /* saved registers during syscall/trap */
        !           146:        struct  mdproc p_md;    /* any machine-dependent fields */
        !           147: 
        !           148:        u_short p_xstat;        /* Exit status for wait; also stop signal */
        !           149:        u_short p_dupfd;        /* sideways return value from fdopen XXX */
        !           150:        u_short p_acflag;       /* accounting flags */
        !           151: /*     short   p_space2; */
        !           152:        struct  rusage *p_ru;   /* exit information XXX */
        !           153: 
        !           154:        long    p_spare[4];     /* tmp spares to avoid shifting eproc */
        !           155: };
        !           156: 
        !           157: #define        p_session       p_pgrp->pg_session
        !           158: #define        p_pgid          p_pgrp->pg_id
        !           159: 
        !           160: /* MOVE TO ucred.h? */
        !           161: /*
        !           162:  * Shareable process credentials (always resident).
        !           163:  * This includes a reference to the current user credentials
        !           164:  * as well as real and saved ids that may be used to change ids.
        !           165:  */
        !           166: struct pcred {
        !           167:        struct  ucred *pc_ucred;        /* current credentials */
        !           168:        uid_t   p_ruid;                 /* real user id */
        !           169:        uid_t   p_svuid;                /* saved effective user id */
        !           170:        gid_t   p_rgid;                 /* real group id */
        !           171:        gid_t   p_svgid;                /* saved effective group id */
        !           172:        int     p_refcnt;               /* number of references */
        !           173: };
        !           174: 
        !           175: /* stat codes */
        !           176: #define        SSLEEP  1               /* awaiting an event */
        !           177: #define        SWAIT   2               /* (abandoned state) */
        !           178: #define        SRUN    3               /* running */
        !           179: #define        SIDL    4               /* intermediate state in process creation */
        !           180: #define        SZOMB   5               /* intermediate state in process termination */
        !           181: #define        SSTOP   6               /* process being traced */
        !           182: 
        !           183: /* flag codes */
        !           184: #define        SLOAD   0x0000001       /* in core */
        !           185: #define        SSYS    0x0000002       /* swapper or pager process */
        !           186: #define        SSINTR  0x0000004       /* sleep is interruptible */
        !           187: #define        SCTTY   0x0000008       /* has a controlling terminal */
        !           188: #define        SPPWAIT 0x0000010       /* parent is waiting for child to exec/exit */
        !           189: #define SEXEC  0x0000020       /* process called exec */
        !           190: #define        STIMO   0x0000040       /* timing out during sleep */
        !           191: #define        SSEL    0x0000080       /* selecting; wakeup/waiting danger */
        !           192: #define        SWEXIT  0x0000100       /* working on exiting */
        !           193: #define        SNOCLDSTOP 0x0000200    /* no SIGCHLD when children stop */
        !           194: /* the following three should probably be changed into a hold count */
        !           195: #define        SLOCK   0x0000400       /* process being swapped out */
        !           196: #define        SKEEP   0x0000800       /* another flag to prevent swap out */
        !           197: #define        SPHYSIO 0x0001000       /* doing physical i/o */
        !           198: #define        STRC    0x0004000       /* process is being traced */
        !           199: #define        SWTED   0x0008000       /* another tracing flag */
        !           200: #define        SADVLCK 0x0040000       /* process may hold a POSIX advisory lock */
        !           201: /* the following should be moved to machine-dependent areas */
        !           202: #define        SOWEUPC 0x0002000       /* owe process an addupc() call at next ast */
        !           203: #ifdef HPUXCOMPAT
        !           204: #define        SHPUX   0x0010000       /* HP-UX process (HPUXCOMPAT) */
        !           205: #else
        !           206: #define        SHPUX   0               /* not HP-UX process (HPUXCOMPAT) */
        !           207: #endif
        !           208: /* not currently in use (never set) */
        !           209: #define        SPAGE   0x0020000       /* process in page wait state */
        !           210: 
        !           211: #ifdef KERNEL
        !           212: /*
        !           213:  * We use process IDs <= PID_MAX;
        !           214:  * PID_MAX + 1 must also fit in a pid_t
        !           215:  * (used to represent "no process group").
        !           216:  */
        !           217: #define        PID_MAX         30000
        !           218: #define        NO_PID          30001
        !           219: #define        PIDHASH(pid)    ((pid) & pidhashmask)
        !           220: 
        !           221: #define SESS_LEADER(p) ((p)->p_session->s_leader == (p))
        !           222: #define        SESSHOLD(s)     ((s)->s_count++)
        !           223: #define        SESSRELE(s)     { \
        !           224:                if (--(s)->s_count == 0) \
        !           225:                        FREE(s, M_SESSION); \
        !           226:        }
        !           227: 
        !           228: extern int pidhashmask;                /* in param.c */
        !           229: extern struct proc *pidhash[];         /* in param.c */
        !           230: struct proc *pfind();                  /* find process by id */
        !           231: extern struct pgrp *pgrphash[];        /* in param.c */
        !           232: struct         pgrp *pgfind();                 /* find process group by id */
        !           233: struct proc *zombproc, *allproc;       /* lists of procs in various states */
        !           234: extern struct proc proc0;              /* process slot for swapper */
        !           235: struct proc *initproc, *pageproc;      /* process slots for init, pager */
        !           236: extern struct proc *curproc;           /* current running proc */
        !           237: extern int nprocs, maxproc;            /* current and max number of procs */
        !           238: 
        !           239: #define        NQS     32              /* 32 run queues */
        !           240: struct prochd {
        !           241:        struct  proc *ph_link;  /* linked list of running processes */
        !           242:        struct  proc *ph_rlink;
        !           243: } qs[NQS];
        !           244: 
        !           245: int    whichqs;                /* bit mask summarizing non-empty qs's */
        !           246: #endif /* KERNEL */
        !           247: 
        !           248: #endif /* !_PROC_H_ */

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