usr/src/sys/sys/proc.h

/*
 * Copyright (c) 1982, 1986 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *      @(#)proc.h      7.6 (Berkeley) %G%
 */

/*
 * One structure allocated per session.
 */
struct  session {
        struct  proc *s_leader; /* pointer to session leader */
        int     s_count;        /* number of pgrps in session */
};

/*
 * One structure allocated per process group.
 */
struct  pgrp {
        struct  pgrp *pg_hforw; /* forward link in hash bucket */
        struct  proc *pg_mem;   /* pointer to pgrp members */
        struct  session *pg_session;    /* pointer to session */
        pid_t   pg_id;          /* pgrp id */
        short   pg_jobc;        /* # procs qualifying pgrp for job control */
};

/*
 * One structure allocated per active
 * process. It contains all data needed
 * about the process while the
 * process may be swapped out.
 * Other per process data (user.h)
 * is swapped with the process.
 */
struct  proc {
        struct  proc *p_link;   /* linked list of running processes */
        struct  proc *p_rlink;
        struct  proc *p_nxt;    /* linked list of allocated proc slots */
        struct  proc **p_prev;          /* also zombies, and free proc's */
        struct  pte *p_addr;    /* u-area kernel map address */
        char    p_usrpri;       /* user-priority based on p_cpu and p_nice */
        char    p_pri;          /* priority, negative is high */
        char    p_cpu;          /* cpu usage for scheduling */
        char    p_stat;
        char    p_time;         /* resident time for scheduling */
        char    p_nice;         /* nice for cpu usage */
        char    p_slptime;      /* time since last block */
        char    p_cursig;
        int     p_sig;          /* signals pending to this process */
        int     p_sigmask;      /* current signal mask */
        int     p_sigignore;    /* signals being ignored */
        int     p_sigcatch;     /* signals being caught by user */
        int     p_flag;
        uid_t   p_uid;          /* user id, used to direct tty signals */
        pid_t   p_pid;          /* unique process id */
        pid_t   p_ppid;         /* process id of parent */
        u_short p_xstat;        /* Exit status for wait */
        struct  rusage *p_ru;   /* mbuf holding exit information */
        short   p_poip;         /* page outs in progress */
        short   p_szpt;         /* copy of page table size */
        size_t  p_tsize;        /* size of text (clicks) */
        size_t  p_dsize;        /* size of data space (clicks) */
        size_t  p_ssize;        /* copy of stack size (clicks) */
        size_t  p_rssize;       /* current resident set size in clicks */
        size_t  p_maxrss;       /* copy of u.u_limit[MAXRSS] */
        size_t  p_swrss;        /* resident set size before last swap */
        swblk_t p_swaddr;       /* disk address of u area when swapped */
        caddr_t p_wchan;        /* event process is awaiting */
        struct  text *p_textp;  /* pointer to text structure */
        struct  pte *p_p0br;    /* page table base P0BR */
        struct  proc *p_xlink;  /* linked list of procs sharing same text */
        short   p_cpticks;      /* ticks of cpu time */
        fixpt_t p_pctcpu;       /* %cpu for this process during p_time */
        short   p_ndx;          /* proc index for memall (because of vfork) */
        short   p_idhash;       /* hashed based on p_pid for kill+exit+... */
        struct  proc *p_pptr;   /* pointer to process structure of parent */
        struct  proc *p_cptr;   /* pointer to youngest living child */
        struct  proc *p_osptr;  /* pointer to older sibling processes */
        struct  proc *p_ysptr;  /* pointer to younger siblings */
        struct  pgrp *p_pgrp;   /* pointer to process group */
#define p_session p_pgrp->pg_session
#define p_pgid  p_pgrp->pg_id
        struct  proc *p_pgrpnxt; /* pointer to next process in process group */
        struct  itimerval p_realtimer;
        struct  quota *p_quota; /* quotas for this process */
        int     p_traceflag;    /* kernel tracing flags (facilities) */
        struct  vnode *p_tracep;/* trace to vnode */
#if defined(tahoe)
        int     p_ckey;         /* code cache key */
        int     p_dkey;         /* data cache key */
#endif
};

#define PIDHSZ          64
#define PIDHASH(pid)    ((pid) & (PIDHSZ - 1))

#ifdef KERNEL
pid_t   pidhash[PIDHSZ];
struct  proc *pfind();
struct  pgrp *pgrphash[PIDHSZ];
struct  pgrp *pgfind();         /* find process group by id */
struct  proc *proc, *procNPROC; /* the proc table itself */
struct  proc *freeproc, *zombproc, *allproc;
                        /* lists of procs in various states */
int     nproc;

#define NQS     32              /* 32 run queues */
struct  prochd {
        struct  proc *ph_link;  /* linked list of running processes */
        struct  proc *ph_rlink;
} qs[NQS];
int     whichqs;                /* bit mask summarizing non-empty qs's */

#define SESS_LEADER(p)  ((p)->p_session->s_leader == (p))
#define PGRP_JOBC(p)    (((p)->p_pgrp != (p)->p_pptr->p_pgrp) && \
                        ((p)->p_session == (p)->p_pptr->p_session))
#endif

/* stat codes */
#define SSLEEP  1               /* awaiting an event */
#define SWAIT   2               /* (abandoned state) */
#define SRUN    3               /* running */
#define SIDL    4               /* intermediate state in process creation */
#define SZOMB   5               /* intermediate state in process termination */
#define SSTOP   6               /* process being traced */

/* flag codes */
#define SLOAD   0x0000001       /* in core */
#define SSYS    0x0000002       /* swapper or pager process */
#define SLOCK   0x0000004       /* process being swapped out */
#define SSWAP   0x0000008       /* save area flag */
#define STRC    0x0000010       /* process is being traced */
#define SWTED   0x0000020       /* another tracing flag */
#define SULOCK  0x0000040       /* user settable lock in core */
#define SPAGE   0x0000080       /* process in page wait state */
#define SKEEP   0x0000100       /* another flag to prevent swap out */
#define SOMASK  0x0000200       /* restore old mask after taking signal */
#define SWEXIT  0x0000400       /* working on exiting */
#define SPHYSIO 0x0000800       /* doing physical i/o (bio.c) */
#define SVFORK  0x0001000       /* process resulted from vfork() */
#define SVFDONE 0x0002000       /* another vfork flag */
#define SNOVM   0x0004000       /* no vm, parent in a vfork() */
#define SPAGV   0x0008000       /* init data space on demand, from vnode */
#define SSEQL   0x0010000       /* user warned of sequential vm behavior */
#define SUANOM  0x0020000       /* user warned of random vm behavior */
#define STIMO   0x0040000       /* timing out during sleep */
/* was SDETACH */
#define SOUSIG  0x0100000       /* using old signal mechanism */
#define SOWEUPC 0x0200000       /* owe process an addupc() call at next ast */
#define SSEL    0x0400000       /* selecting; wakeup/waiting danger */
#define SLOGIN  0x0800000       /* a login process (legit child of init) */
#define SPTECHG 0x1000000       /* pte's for process have changed */
#define SKTR    0x2000000       /* pass kernel tracing flags to children */
#define SEXEC   0x8000000       /* process called exec */