/*-
* Copyright (c) 1986, 1989, 1991, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)proc.h 8.8 (Berkeley) 1/21/94
*/
#ifndef _SYS_PROC_H_
#define _SYS_PROC_H_
#include <machine/proc.h> /* Machine-dependent proc substruct. */
#include <sys/select.h> /* For struct selinfo. */
/*
* One structure allocated per session.
*/
struct session {
int s_count; /* Ref cnt; pgrps in session. */
struct proc *s_leader; /* Session leader. */
struct vnode *s_ttyvp; /* Vnode of controlling terminal. */
struct tty *s_ttyp; /* Controlling terminal. */
char s_login[MAXLOGNAME]; /* Setlogin() name. */
};
/*
* 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. */
int pg_jobc; /* # procs qualifying pgrp for job control */
};
/*
* Description of a process.
*
* This structure contains the information needed to manage a thread of
* control, known in UN*X as a process; it has references to substructures
* containing descriptions of things that the process uses, but may share
* with related processes. The process structure and the substructures
* are always addressible except for those marked "(PROC ONLY)" below,
* which might be addressible only on a processor on which the process
* is running.
*/
struct proc {
struct proc *p_forw; /* Doubly-linked run/sleep queue. */
struct proc *p_back;
struct proc *p_next; /* Linked list of active procs */
struct proc **p_prev; /* and zombies. */
/* substructures: */
struct pcred *p_cred; /* Process owner's identity. */
struct filedesc *p_fd; /* Ptr to open files structure. */
struct pstats *p_stats; /* Accounting/statistics (PROC ONLY). */
struct plimit *p_limit; /* Process limits. */
struct vmspace *p_vmspace; /* Address space. */
struct sigacts *p_sigacts; /* Signal actions, state (PROC ONLY). */
#define p_ucred p_cred->pc_ucred
#define p_rlimit p_limit->pl_rlimit
int p_flag; /* P_* flags. */
char p_stat; /* S* process status. */
char p_lock; /* process lock count */
char p_pad1[2];
pid_t p_pid; /* Process identifier. */
struct proc *p_hash; /* Hashed based on p_pid for kill+exit+... */
struct proc *p_pgrpnxt; /* Pointer to next process in process group. */
struct proc *p_pptr; /* Pointer to process structure of parent. */
struct proc *p_osptr; /* Pointer to older sibling processes. */
/* The following fields are all zeroed upon creation in fork. */
#define p_startzero p_ysptr
struct proc *p_ysptr; /* Pointer to younger siblings. */
struct proc *p_cptr; /* Pointer to youngest living child. */
pid_t p_oppid; /* Save parent pid during ptrace. XXX */
int p_dupfd; /* Sideways return value from fdopen. XXX */
/* scheduling */
u_int p_estcpu; /* Time averaged value of p_cpticks. */
int p_cpticks; /* Ticks of cpu time. */
fixpt_t p_pctcpu; /* %cpu for this process during p_swtime */
void *p_wchan; /* Sleep address. */
char *p_wmesg; /* Reason for sleep. */
u_int p_swtime; /* Time swapped in or out. */
u_int p_slptime; /* Time since last blocked. */
struct itimerval p_realtimer; /* Alarm timer. */
struct timeval p_rtime; /* Real time. */
u_quad_t p_uticks; /* Statclock hits in user mode. */
u_quad_t p_sticks; /* Statclock hits in system mode. */
u_quad_t p_iticks; /* Statclock hits processing intr. */
int p_traceflag; /* Kernel trace points. */
struct vnode *p_tracep; /* Trace to vnode. */
int p_siglist; /* Signals arrived but not delivered. */
struct vnode *p_textvp; /* Vnode of executable. */
long p_spare[5]; /* pad to 256, avoid shifting eproc. */
/* End area that is zeroed on creation. */
#define p_endzero p_startcopy
/* The following fields are all copied upon creation in fork. */
#define p_startcopy p_sigmask
sigset_t p_sigmask; /* Current signal mask. */
sigset_t p_sigignore; /* Signals being ignored. */
sigset_t p_sigcatch; /* Signals being caught by user. */
u_char p_priority; /* Process priority. */
u_char p_usrpri; /* User-priority based on p_cpu and p_nice. */
char p_nice; /* Process "nice" value. */
char p_comm[MAXCOMLEN+1];
struct pgrp *p_pgrp; /* Pointer to process group. */
/* End area that is copied on creation. */
#define p_endcopy p_thread
int p_thread; /* Id for this "thread"; Mach glue. XXX */
struct user *p_addr; /* Kernel virtual addr of u-area (PROC ONLY). */
struct mdproc p_md; /* Any machine-dependent fields. */
u_short p_xstat; /* Exit status for wait; also stop signal. */
u_short p_acflag; /* Accounting flags. */
struct rusage *p_ru; /* Exit information. XXX */
};
#define p_session p_pgrp->pg_session
#define p_pgid p_pgrp->pg_id
/* Status values. */
#define SIDL 1 /* Process being created by fork. */
#define SRUN 2 /* Currently runnable. */
#define SSLEEP 3 /* Sleeping on an address. */
#define SSTOP 4 /* Process debugging or suspension. */
#define SZOMB 5 /* Awaiting collection by parent. */
/* These flags are kept in p_flags. */
#define P_ADVLOCK 0x00001 /* Process may hold a POSIX advisory lock. */
#define P_CONTROLT 0x00002 /* Has a controlling terminal. */
#define P_INMEM 0x00004 /* Loaded into memory. */
#define P_NOCLDSTOP 0x00008 /* No SIGCHLD when children stop. */
#define P_PPWAIT 0x00010 /* Parent is waiting for child to exec/exit. */
#define P_PROFIL 0x00020 /* Has started profiling. */
#define P_SELECT 0x00040 /* Selecting; wakeup/waiting danger. */
#define P_SINTR 0x00080 /* Sleep is interruptible. */
#define P_SUGID 0x00100 /* Had set id privileges since last exec. */
#define P_SYSTEM 0x00200 /* System proc: no sigs, stats or swapping. */
#define P_TIMEOUT 0x00400 /* Timing out during sleep. */
#define P_TRACED 0x00800 /* Debugged process being traced. */
#define P_WAITED 0x01000 /* Debugging process has waited for child. */
#define P_WEXIT 0x02000 /* Working on exiting. */
#define P_EXEC 0x04000 /* Process called exec. */
/* Should probably be changed into a hold count. */
#define P_NOSWAP 0x08000 /* Another flag to prevent swap out. */
#define P_PHYSIO 0x10000 /* Doing physical I/O. */
/* Should be moved to machine-dependent areas. */
#define P_OWEUPC 0x20000 /* Owe process an addupc() call at next ast. */
/*
* MOVE TO ucred.h?
*
* Shareable process credentials (always resident). This includes a reference
* to the current user credentials as well as real and saved ids that may be
* used to change ids.
*/
struct pcred {
struct ucred *pc_ucred; /* Current credentials. */
uid_t p_ruid; /* Real user id. */
uid_t p_svuid; /* Saved effective user id. */
gid_t p_rgid; /* Real group id. */
gid_t p_svgid; /* Saved effective group id. */
int p_refcnt; /* Number of references. */
};
#ifdef KERNEL
/*
* We use process IDs <= PID_MAX; PID_MAX + 1 must also fit in a pid_t,
* as it is used to represent "no process group".
*/
#define PID_MAX 30000
#define NO_PID 30001
#define PIDHASH(pid) ((pid) & pidhashmask)
#define SESS_LEADER(p) ((p)->p_session->s_leader == (p))
#define SESSHOLD(s) ((s)->s_count++)
#define SESSRELE(s) { \
if (--(s)->s_count == 0) \
FREE(s, M_SESSION); \
}
extern struct proc *pidhash[]; /* In param.c. */
extern struct pgrp *pgrphash[]; /* In param.c. */
extern struct proc *curproc; /* Current running proc. */
extern struct proc proc0; /* Process slot for swapper. */
extern int nprocs, maxproc; /* Current and max number of procs. */
extern int pidhashmask; /* In param.c. */
volatile struct proc *allproc; /* List of active procs. */
struct proc *zombproc; /* List of zombie procs. */
struct proc *initproc, *pageproc; /* Process slots for init, pager. */
#define NQS 32 /* 32 run queues. */
int whichqs; /* Bit mask summary of non-empty Q's. */
struct prochd {
struct proc *ph_link; /* Linked list of running processes. */
struct proc *ph_rlink;
} qs[NQS];
struct proc *pfind __P((pid_t)); /* Find process by id. */
struct pgrp *pgfind __P((pid_t)); /* Find process group by id. */
void mi_switch __P((void));
void resetpriority __P((struct proc *));
void setrunnable __P((struct proc *));
void setrunqueue __P((struct proc *));
void sleep __P((void *chan, int pri));
int tsleep __P((void *chan, int pri, char *wmesg, int timo));
void unsleep __P((struct proc *));
void wakeup __P((void *chan));
#endif /* KERNEL */
#endif /* !_SYS_PROC_H_ */
