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38 * @(#)proc.h 8.15 (Berkeley) 5/19/95
39 * $FreeBSD: src/sys/sys/proc.h,v 1.99.2.9 2003/06/06 20:21:32 tegge Exp $
40 * $DragonFly: src/sys/sys/proc.h,v 1.2 2003/06/17 04:28:58 dillon Exp $
46 #include <machine/proc.h> /* Machine-dependent proc substruct. */
47 #include <sys/callout.h> /* For struct callout_handle. */
48 #include <sys/filedesc.h>
49 #include <sys/queue.h>
50 #include <sys/rtprio.h> /* For struct rtprio. */
51 #include <sys/signal.h>
53 #include <sys/time.h> /* For structs itimerval, timeval. */
55 #include <sys/ucred.h>
56 #include <sys/event.h> /* For struct klist */
59 * One structure allocated per session.
62 int s_count; /* Ref cnt; pgrps in session. */
63 struct proc *s_leader; /* Session leader. */
64 struct vnode *s_ttyvp; /* Vnode of controlling terminal. */
65 struct tty *s_ttyp; /* Controlling terminal. */
66 pid_t s_sid; /* Session ID */
67 char s_login[roundup(MAXLOGNAME, sizeof(long))]; /* Setlogin() name. */
71 * One structure allocated per process group.
74 LIST_ENTRY(pgrp) pg_hash; /* Hash chain. */
75 LIST_HEAD(, proc) pg_members; /* Pointer to pgrp members. */
76 struct session *pg_session; /* Pointer to session. */
77 struct sigiolst pg_sigiolst; /* List of sigio sources. */
78 pid_t pg_id; /* Pgrp id. */
79 int pg_jobc; /* # procs qualifying pgrp for job control */
83 sigset_t ps_sigignore; /* Signals being ignored. */
84 sigset_t ps_sigcatch; /* Signals being caught by user. */
86 struct sigacts *ps_sigacts;
90 #define PS_NOCLDWAIT 0x0001 /* No zombies if child dies */
91 #define PS_NOCLDSTOP 0x0002 /* No SIGCHLD when children stop. */
94 * pasleep structure, used by asleep() syscall to hold requested priority
95 * and timeout values for await().
98 int as_priority; /* Async priority. */
99 int as_timo; /* Async timeout. */
103 * pargs, used to hold a copy of the command line, if it had a sane
107 u_int ar_ref; /* Reference count */
108 u_int ar_length; /* Length */
109 u_char ar_args[0]; /* Arguments */
113 * Description of a process.
115 * This structure contains the information needed to manage a thread of
116 * control, known in UN*X as a process; it has references to substructures
117 * containing descriptions of things that the process uses, but may share
118 * with related processes. The process structure and the substructures
119 * are always addressable except for those marked "(PROC ONLY)" below,
120 * which might be addressable only on a processor on which the process
127 TAILQ_ENTRY(proc) p_procq; /* run/sleep queue. */
128 LIST_ENTRY(proc) p_list; /* List of all processes. */
131 struct pcred *p_cred; /* Process owner's identity. */
132 struct filedesc *p_fd; /* Ptr to open files structure. */
133 struct filedesc_to_leader *p_fdtol; /* Ptr to tracking node */
134 struct pstats *p_stats; /* Accounting/statistics (PROC ONLY). */
135 struct plimit *p_limit; /* Process limits. */
136 struct vm_object *p_upages_obj;/* Upages object */
137 struct procsig *p_procsig;
138 #define p_sigacts p_procsig->ps_sigacts
139 #define p_sigignore p_procsig->ps_sigignore
140 #define p_sigcatch p_procsig->ps_sigcatch
142 #define p_ucred p_cred->pc_ucred
143 #define p_rlimit p_limit->pl_rlimit
145 int p_flag; /* P_* flags. */
146 char p_stat; /* S* process status. */
149 pid_t p_pid; /* Process identifier. */
150 LIST_ENTRY(proc) p_hash; /* Hash chain. */
151 LIST_ENTRY(proc) p_pglist; /* List of processes in pgrp. */
152 struct proc *p_pptr; /* Pointer to parent process. */
153 LIST_ENTRY(proc) p_sibling; /* List of sibling processes. */
154 LIST_HEAD(, proc) p_children; /* Pointer to list of children. */
156 struct callout_handle p_ithandle; /*
157 * Callout handle for scheduling
160 /* The following fields are all zeroed upon creation in fork. */
161 #define p_startzero p_oppid
163 pid_t p_oppid; /* Save parent pid during ptrace. XXX */
164 int p_dupfd; /* Sideways return value from fdopen. XXX */
166 struct vmspace *p_vmspace; /* Address space. */
169 u_int p_estcpu; /* Time averaged value of p_cpticks. */
170 int p_cpticks; /* Ticks of cpu time. */
171 fixpt_t p_pctcpu; /* %cpu for this process during p_swtime */
172 void *p_wchan; /* Sleep address. */
173 const char *p_wmesg; /* Reason for sleep. */
174 u_int p_swtime; /* Time swapped in or out. */
175 u_int p_slptime; /* Time since last blocked. */
177 struct itimerval p_realtimer; /* Alarm timer. */
178 u_int64_t p_runtime; /* Real time in microsec. */
179 u_int64_t p_uu; /* Previous user time in microsec. */
180 u_int64_t p_su; /* Previous system time in microsec. */
181 u_int64_t p_iu; /* Previous interrupt time in usec. */
182 u_int64_t p_uticks; /* Statclock hits in user mode. */
183 u_int64_t p_sticks; /* Statclock hits in system mode. */
184 u_int64_t p_iticks; /* Statclock hits processing intr. */
186 int p_traceflag; /* Kernel trace points. */
187 struct vnode *p_tracep; /* Trace to vnode. */
189 sigset_t p_siglist; /* Signals arrived but not delivered. */
191 struct vnode *p_textvp; /* Vnode of executable. */
193 char p_lock; /* Process lock (prevent swap) count. */
194 u_char p_oncpu; /* Which cpu we are on */
195 u_char p_lastcpu; /* Last cpu we were on */
196 char p_rqindex; /* Run queue index */
198 short p_locks; /* DEBUG: lockmgr count of held locks */
199 short p_simple_locks; /* DEBUG: count of held simple locks */
200 unsigned int p_stops; /* procfs event bitmask */
201 unsigned int p_stype; /* procfs stop event type */
202 char p_step; /* procfs stop *once* flag */
203 unsigned char p_pfsflags; /* procfs flags */
204 char p_pad3[2]; /* padding for alignment */
205 register_t p_retval[2]; /* syscall aux returns */
206 struct sigiolst p_sigiolst; /* list of sigio sources */
207 int p_sigparent; /* signal to parent on exit */
208 sigset_t p_oldsigmask; /* saved mask from before sigpause */
209 int p_sig; /* for core dump/debugger XXX */
210 u_long p_code; /* for core dump/debugger XXX */
211 struct klist p_klist; /* knotes attached to this process */
213 /* End area that is zeroed on creation. */
214 #define p_endzero p_startcopy
216 /* The following fields are all copied upon creation in fork. */
217 #define p_startcopy p_sigmask
219 sigset_t p_sigmask; /* Current signal mask. */
220 stack_t p_sigstk; /* sp & on stack state variable */
221 u_char p_priority; /* Process priority. */
222 u_char p_usrpri; /* User-priority based on p_cpu and p_nice. */
223 char p_nice; /* Process "nice" value. */
224 char p_comm[MAXCOMLEN+1];
226 struct pgrp *p_pgrp; /* Pointer to process group. */
228 struct sysentvec *p_sysent; /* System call dispatch information. */
230 struct rtprio p_rtprio; /* Realtime priority. */
231 struct prison *p_prison;
232 struct pargs *p_args;
233 /* End area that is copied on creation. */
234 #define p_endcopy p_addr
235 struct user *p_addr; /* Kernel virtual addr of u-area (PROC ONLY). */
236 struct mdproc p_md; /* Any machine-dependent fields. */
238 u_short p_xstat; /* Exit status for wait; also stop signal. */
239 u_short p_acflag; /* Accounting flags. */
240 struct rusage *p_ru; /* Exit information. XXX */
242 int p_nthreads; /* number of threads (only in leader) */
243 void *p_aioinfo; /* ASYNC I/O info */
244 int p_wakeup; /* thread id */
245 struct proc *p_peers;
246 struct proc *p_leader;
247 struct pasleep p_asleep; /* Used by asleep()/await(). */
248 void *p_emuldata; /* process-specific emulator state data */
251 #define p_session p_pgrp->pg_session
252 #define p_pgid p_pgrp->pg_id
255 #define SIDL 1 /* Process being created by fork. */
256 #define SRUN 2 /* Currently runnable. */
257 #define SSLEEP 3 /* Sleeping on an address. */
258 #define SSTOP 4 /* Process debugging or suspension. */
259 #define SZOMB 5 /* Awaiting collection by parent. */
261 /* These flags are kept in p_flags. */
262 #define P_ADVLOCK 0x00001 /* Process may hold a POSIX advisory lock. */
263 #define P_CONTROLT 0x00002 /* Has a controlling terminal. */
264 #define P_INMEM 0x00004 /* Loaded into memory. */
265 #define P_PPWAIT 0x00010 /* Parent is waiting for child to exec/exit. */
266 #define P_PROFIL 0x00020 /* Has started profiling. */
267 #define P_SELECT 0x00040 /* Selecting; wakeup/waiting danger. */
268 #define P_SINTR 0x00080 /* Sleep is interruptible. */
269 #define P_SUGID 0x00100 /* Had set id privileges since last exec. */
270 #define P_SYSTEM 0x00200 /* System proc: no sigs, stats or swapping. */
271 #define P_TIMEOUT 0x00400 /* Timing out during sleep. */
272 #define P_TRACED 0x00800 /* Debugged process being traced. */
273 #define P_WAITED 0x01000 /* Debugging process has waited for child. */
274 #define P_WEXIT 0x02000 /* Working on exiting. */
275 #define P_EXEC 0x04000 /* Process called exec. */
277 /* Should probably be changed into a hold count. */
278 /* was P_NOSWAP 0x08000 was: Do not swap upages; p->p_hold */
279 /* was P_PHYSIO 0x10000 was: Doing physical I/O; use p->p_hold */
281 /* Should be moved to machine-dependent areas. */
282 #define P_OWEUPC 0x20000 /* Owe process an addupc() call at next ast. */
284 #define P_SWAPPING 0x40000 /* Process is being swapped. */
285 #define P_SWAPINREQ 0x80000 /* Swapin request due to wakeup */
287 /* Marked a kernel thread */
288 #define P_UNUSED100000 0x100000
289 #define P_KTHREADP 0x200000 /* Process is really a kernel thread */
291 #define P_DEADLKTREAT 0x800000 /* lock aquisition - deadlock treatment */
293 #define P_JAILED 0x1000000 /* Process is in jail */
294 #define P_OLDMASK 0x2000000 /* need to restore mask before pause */
295 #define P_ALTSTACK 0x4000000 /* have alternate signal stack */
296 #define P_INEXEC 0x8000000 /* Process is in execve(). */
301 * Shareable process credentials (always resident). This includes a reference
302 * to the current user credentials as well as real and saved ids that may be
303 * used to change ids.
306 struct ucred *pc_ucred; /* Current credentials. */
307 uid_t p_ruid; /* Real user id. */
308 uid_t p_svuid; /* Saved effective user id. */
309 gid_t p_rgid; /* Real group id. */
310 gid_t p_svgid; /* Saved effective group id. */
311 int p_refcnt; /* Number of references. */
312 struct uidinfo *p_uidinfo; /* Per uid resource consumption */
318 #ifdef MALLOC_DECLARE
319 MALLOC_DECLARE(M_SESSION);
320 MALLOC_DECLARE(M_SUBPROC);
321 MALLOC_DECLARE(M_ZOMBIE);
322 MALLOC_DECLARE(M_PARGS);
325 /* flags for suser_xxx() */
326 #define PRISON_ROOT 1
328 /* Handy macro to determine of p1 can mangle p2 */
330 #define PRISON_CHECK(p1, p2) \
331 ((!(p1)->p_prison) || (p1)->p_prison == (p2)->p_prison)
334 * We use process IDs <= PID_MAX; PID_MAX + 1 must also fit in a pid_t,
335 * as it is used to represent "no process group".
337 #define PID_MAX 99999
338 #define NO_PID 100000
340 #define SESS_LEADER(p) ((p)->p_session->s_leader == (p))
341 #define SESSHOLD(s) ((s)->s_count++)
342 #define SESSRELE(s) { \
343 if (--(s)->s_count == 0) \
344 FREE(s, M_SESSION); \
348 * STOPEVENT is MP SAFE.
350 extern void stopevent(struct proc*, unsigned int, unsigned int);
351 #define STOPEVENT(p,e,v) \
353 if ((p)->p_stops & (e)) { \
360 /* hold process U-area in memory, normally for ptrace/procfs work */
362 if ((p)->p_lock++ == 0 && ((p)->p_flag & P_INMEM) == 0) \
365 #define PRELE(p) (--(p)->p_lock)
367 #define PIDHASH(pid) (&pidhashtbl[(pid) & pidhash])
368 extern LIST_HEAD(pidhashhead, proc) *pidhashtbl;
369 extern u_long pidhash;
371 #define PGRPHASH(pgid) (&pgrphashtbl[(pgid) & pgrphash])
372 extern LIST_HEAD(pgrphashhead, pgrp) *pgrphashtbl;
373 extern u_long pgrphash;
376 #define SET_CURPROC(p) (curproc = (p))
380 extern struct proc *curproc; /* Current running proc. */
381 extern u_int astpending; /* software interrupt pending */
382 extern int switchticks; /* `ticks' at last context switch. */
383 extern struct timeval switchtime; /* Uptime at last context switch */
385 extern struct proc proc0; /* Process slot for swapper. */
386 extern int hogticks; /* Limit on kernel cpu hogs. */
387 extern int nprocs, maxproc; /* Current and max number of procs. */
388 extern int maxprocperuid; /* Max procs per uid. */
389 extern int sched_quantum; /* Scheduling quantum in ticks */
391 LIST_HEAD(proclist, proc);
392 extern struct proclist allproc; /* List of all processes. */
393 extern struct proclist zombproc; /* List of zombie processes. */
394 extern struct proc *initproc, *pageproc, *updateproc; /* Process slots for init, pager. */
396 #define NQS 32 /* 32 run queues. */
397 TAILQ_HEAD(rq, proc);
398 extern struct rq queues[];
399 extern struct rq rtqueues[];
400 extern struct rq idqueues[];
401 extern int whichqs; /* Bit mask summary of non-empty Q's. */
402 extern int whichrtqs; /* Bit mask summary of non-empty Q's. */
403 extern int whichidqs; /* Bit mask summary of non-empty Q's. */
406 * XXX macros for scheduler. Shouldn't be here, but currently needed for
407 * bounding the dubious p_estcpu inheritance in wait1().
408 * INVERSE_ESTCPU_WEIGHT is only suitable for statclock() frequencies in
409 * the range 100-256 Hz (approximately).
411 #define ESTCPULIM(e) \
412 min((e), INVERSE_ESTCPU_WEIGHT * (NICE_WEIGHT * PRIO_MAX - PPQ) + \
413 INVERSE_ESTCPU_WEIGHT - 1)
414 #define INVERSE_ESTCPU_WEIGHT 8 /* 1 / (priorities per estcpu level) */
415 #define NICE_WEIGHT 2 /* priorities per nice level */
416 #define PPQ (128 / NQS) /* priorities per queue */
418 extern u_long ps_arg_cache_limit;
419 extern int ps_argsopen;
421 struct proc *pfind __P((pid_t)); /* Find process by id. */
422 struct pgrp *pgfind __P((pid_t)); /* Find process group by id. */
423 struct proc *zpfind __P((pid_t)); /* Find zombie process by id. */
426 extern struct vm_zone *proc_zone;
428 int enterpgrp __P((struct proc *p, pid_t pgid, int mksess));
429 void fixjobc __P((struct proc *p, struct pgrp *pgrp, int entering));
430 int inferior __P((struct proc *p));
431 int leavepgrp __P((struct proc *p));
432 void mi_switch __P((void));
433 void procinit __P((void));
434 int p_trespass __P((struct proc *p1, struct proc *p2));
435 void resetpriority __P((struct proc *));
436 int roundrobin_interval __P((void));
437 void schedclock __P((struct proc *));
438 void setrunnable __P((struct proc *));
439 void setrunqueue __P((struct proc *));
440 void sleepinit __P((void));
441 int suser __P((struct proc *));
442 int suser_xxx __P((struct ucred *cred, struct proc *proc, int flag));
443 void remrunqueue __P((struct proc *));
444 void cpu_switch __P((struct proc *));
445 void unsleep __P((struct proc *));
447 void cpu_exit __P((struct proc *)) __dead2;
448 void exit1 __P((struct proc *, int)) __dead2;
449 void cpu_fork __P((struct proc *, struct proc *, int));
450 void cpu_set_fork_handler __P((struct proc *, void (*)(void *), void *));
451 int fork1 __P((struct proc *, int, struct proc **));
452 int trace_req __P((struct proc *));
453 void cpu_wait __P((struct proc *));
454 int cpu_coredump __P((struct proc *, struct vnode *, struct ucred *));
455 void setsugid __P((struct proc *p));
456 void faultin __P((struct proc *p));
458 struct proc * chooseproc __P((void));
459 u_int32_t procrunnable __P((void));
463 #endif /* !_SYS_PROC_H_ */