2 * Copyright (c) 1986, 1989, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
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35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
41 #if !defined(_KERNEL) && !defined(_KERNEL_STRUCTURES)
43 #error "Userland must include sys/user.h instead of sys/proc.h"
47 #include <sys/callout.h> /* For struct callout_handle. */
48 #include <sys/filedesc.h>
49 #include <sys/queue.h>
51 #include <sys/rtprio.h> /* For struct rtprio. */
52 #include <sys/signal.h>
54 #include <sys/upmap.h>
56 #include <sys/time.h> /* For structs itimerval, timeval. */
58 #include <sys/ucred.h>
59 #include <sys/event.h> /* For struct klist */
60 #include <sys/eventvar.h>
61 #include <sys/sysent.h> /* For struct sysentvec */
62 #include <sys/thread.h>
63 #include <sys/varsym.h>
64 #include <sys/resourcevar.h>
66 #include <sys/globaldata.h>
68 #include <sys/systimer.h>
69 #include <sys/iosched.h>
70 #include <sys/usched.h>
71 #include <machine/proc.h> /* Machine-dependent proc substruct. */
72 #include <machine/atomic.h> /* Machine-dependent proc substruct. */
73 #include <sys/signalvar.h>
80 LIST_HEAD(proclist, proc);
81 LIST_HEAD(pgrplist, pgrp);
82 LIST_HEAD(sesslist, session);
83 LIST_HEAD(lwplist, lwp);
86 RB_HEAD(lwp_rb_tree, lwp);
87 RB_PROTOTYPE2(lwp_rb_tree, lwp, u.lwp_rbnode, rb_lwp_compare, lwpid_t);
90 * One structure allocated per session.
93 LIST_ENTRY(session) s_list; /* Hash chain. */
94 int s_count; /* Ref cnt; pgrps in session. */
95 struct proc *s_leader; /* Session leader. */
96 struct vnode *s_ttyvp; /* Vnode of controlling terminal. */
97 struct tty *s_ttyp; /* Controlling terminal. */
98 pid_t s_sid; /* Session ID */
99 char s_login[roundup(MAXLOGNAME, sizeof(long))]; /* Setlogin() name. */
103 * One structure allocated per process group.
106 LIST_ENTRY(pgrp) pg_list; /* Hash chain. */
107 struct proclist pg_members; /* Pointer to pgrp members. */
108 struct session *pg_session; /* Pointer to session. */
109 struct sigiolst pg_sigiolst; /* List of sigio sources. */
110 pid_t pg_id; /* Pgrp id. */
111 int pg_jobc; /* # procs qualifying pgrp for job control */
113 struct lwkt_token pg_token;
117 #define PS_NOCLDWAIT 0x0001 /* No zombies if child dies */
118 #define PS_NOCLDSTOP 0x0002 /* No SIGCHLD when children stop. */
119 #define PS_CLDSIGIGN 0x0004 /* The SIGCHLD handler is SIG_IGN. */
122 * pargs, used to hold a copy of the command line, if it had a sane
126 u_int ar_ref; /* Reference count */
127 u_int ar_length; /* Length */
128 u_char ar_args[0]; /* Arguments */
132 * Description of a process.
134 * This structure contains the information needed to manage a thread of
135 * control, known in UN*X as a process; it has references to substructures
136 * containing descriptions of things that the process uses, but may share
137 * with related processes. The process structure and the substructures
138 * are always addressable except for those marked "(PROC ONLY)" below,
139 * which might be addressable only on a processor on which the process
142 * NOTE! The process start time is stored in the thread structure associated
143 * with the process. If the process is a Zombie, then this field will be
144 * inaccessible due to the thread structure being free'd in kern_wait1().
150 struct vmspace_entry;
168 TAILQ_ENTRY(lwp) lwp_procq; /* run/sleep queue. */
170 RB_ENTRY(lwp) lwp_rbnode; /* RB tree node - lwp in proc */
171 LIST_ENTRY(lwp) lwp_reap_entry; /* reaper list */
174 struct proc *lwp_proc; /* Link to our proc. */
175 struct vmspace *lwp_vmspace; /* Inherited from p_vmspace */
176 struct vkernel_lwp *lwp_vkernel;/* VKernel support, lwp part */
178 lwpid_t lwp_tid; /* Our thread id */
180 u_int lwp_flags; /* LWP_* flags */
181 u_int lwp_mpflags; /* LWP_MP_* flags */
182 enum lwpstat lwp_stat; /* LS* lwp status */
183 int lwp_lock; /* lwp lock (prevent destruct) count */
185 int lwp_dupfd; /* Sideways return value from fdopen */
188 * The following two fields are marked XXX since (at least) the
189 * 4.4BSD-Lite2 import. I can only guess the reason: It is ugly.
190 * These fields are used to pass the trap code from trapsignal() to
191 * postsig(), which gets called later from userret().
193 * The correct "fix" for these XXX is to convert our signal system
194 * to use signal queues, where each signal can carry its own meta
197 int lwp_sig; /* for core dump/debugger XXX */
198 u_long lwp_code; /* for core dump/debugger XXX */
203 sysclock_t lwp_cpticks; /* cpu used in sched clock ticks */
204 sysclock_t lwp_cpbase; /* Measurement base */
205 fixpt_t lwp_pctcpu; /* %cpu for this process */
206 u_int lwp_slptime; /* Time since last blocked. */
207 u_int lwp_rebal_ticks; /* Timestamp sched on current cpu */
209 int lwp_traceflag; /* Kernel trace points. */
211 struct rusage lwp_ru; /* stats for this lwp */
213 union usched_data lwp_usdata; /* User scheduler specific */
215 #define lwp_startcopy lwp_cpumask
216 cpumask_t lwp_cpumask;
217 sigset_t lwp_siglist; /* Signals arrived but not delivered. */
218 sigset_t lwp_oldsigmask; /* saved mask from before sigpause */
219 sigset_t lwp_sigmask; /* Current signal mask. */
220 stack_t lwp_sigstk; /* sp & on stack state variable */
222 struct rtprio lwp_rtprio; /* Realtime priority. */
223 #define lwp_endcopy lwp_md
225 struct mdproc lwp_md; /* Any machine-dependent fields. */
227 struct thread *lwp_thread; /* backpointer to proc's thread */
228 void *lwp_unused01; /* for future fields */
229 struct kqueue lwp_kqueue; /* for select/poll */
230 u_int lwp_kqueue_serial;
231 struct lwkt_token lwp_token; /* per-lwp token for signal/state */
232 struct spinlock lwp_spin; /* spinlock for signal handling */
233 void *lwp_reserveds1; /* reserved for lwp_saveusp */
234 void *lwp_reserveds2; /* reserved for lwp_saveupc */
238 LIST_ENTRY(proc) p_list; /* List of all processes. */
241 struct ucred *p_ucred; /* Process owner's identity. */
242 struct filedesc *p_fd; /* Ptr to open files structure. */
243 struct filedesc_to_leader *p_fdtol; /* Ptr to tracking node XXX lwp */
244 struct plimit *p_limit; /* Process limits. */
245 struct pstats *p_stats;
246 u_int p_mqueue_cnt; /* Count of open mqueues. */
247 long p_waitgen; /* wait interlock allows late signal */
248 struct sigacts *p_sigacts;
249 #define p_sigignore p_sigacts->ps_sigignore
250 #define p_sigcatch p_sigacts->ps_sigcatch
251 #define p_rlimit p_limit->pl_rlimit
253 int p_flags; /* P_* flags. */
254 enum procstat p_stat; /* S* process status. */
257 pid_t p_pid; /* Process identifier. */
258 LIST_ENTRY(proc) p_pglist; /* List of processes in pgrp. */
259 struct proc *p_pptr; /* Pointer to parent process. */
260 LIST_ENTRY(proc) p_sibling; /* List of sibling processes. */
261 struct proclist p_children; /* Pointer to list of children. */
262 struct callout p_ithandle; /* for scheduling p_realtimer */
263 struct varsymset p_varsymset;
264 struct iosched_data p_iosdata; /* Dynamic I/O scheduling data */
266 pid_t p_oppid; /* Save parent pid during ptrace. XXX */
268 struct vmspace *p_vmspace; /* Current address space. */
270 unsigned int p_swtime; /* Time swapped in or out */
272 struct itimerval p_realtimer; /* Alarm timer. */
273 struct itimerval p_timer[3]; /* Virtual-time timers. */
275 int p_traceflag; /* Kernel trace points. */
276 struct ktrace_node *p_tracenode; /* Trace to vnode. */
278 sigset_t p_siglist; /* Signals arrived but not delivered. */
280 struct vnode *p_textvp; /* Vnode of executable. */
281 struct nchandle p_textnch; /* namecache handle of executable. */
283 unsigned int p_stops; /* procfs event bitmask */
284 unsigned int p_stype; /* procfs stop event type */
285 char p_step; /* procfs stop *once* flag */
286 unsigned char p_pfsflags; /* procfs flags */
288 struct sigiolst p_sigiolst; /* list of sigio sources */
289 int p_sigparent; /* signal to parent on exit */
290 struct klist p_klist; /* knotes attached to this process */
292 struct timeval p_start; /* start time for a process */
294 struct rusage p_ru; /* stats for this proc */
295 struct rusage p_cru; /* sum of stats for reaped children */
296 void *p_dsched_priv1;
298 /* The following fields are all copied upon creation in fork. */
299 #define p_startcopy p_comm
301 char p_comm[MAXCOMLEN+1]; /* typ 16+1 bytes */
303 char p_nice; /* Process "nice" value. */
305 int p_osrel; /* release date for binary ELF note */
307 struct pgrp *p_pgrp; /* Pointer to process group. */
309 struct sysentvec *p_sysent; /* System call dispatch information. */
311 struct uprof p_prof; /* Profiling arguments. */
312 struct rtprio p_rtprio; /* Realtime priority. */
313 struct pargs *p_args;
314 u_short p_xstat; /* Exit status or last stop signal */
317 void *p_dsched_priv2;
318 /* End area that is copied on creation. */
319 #define p_endcopy p_dsched_priv2
320 u_short p_acflag; /* Accounting flags. */
322 int p_lock; /* Prevent proc destruction */
323 int p_nthreads; /* Number of threads in this process. */
324 int p_nstopped; /* Number of stopped threads. */
325 int p_lasttid; /* Last tid used. */
326 struct lwp_rb_tree p_lwp_tree; /* RB tree of LWPs for this process */
327 void *p_aioinfo; /* ASYNC I/O info */
328 int p_wakeup; /* thread id XXX lwp */
329 struct proc *p_peers; /* XXX lwp */
330 struct proc *p_leader; /* XXX lwp */
331 void *p_emuldata; /* process-specific emulator state */
332 struct usched *p_usched; /* Userland scheduling control */
333 struct vkernel_proc *p_vkernel; /* VKernel support, proc part */
334 int p_numposixlocks; /* number of POSIX locks */
335 void (*p_userret)(void);/* p: return-to-user hook */
337 struct spinlock p_spin; /* Spinlock for LWP access to proc */
338 struct lwkt_token p_token; /* Token for LWP access to proc */
339 struct sem_undo *p_sem_undo; /* Fast semaphore tracking lookup */
340 void *p_drv_priv; /* scp linkage (for syscons) */
342 cpulock_t p_vmm_cpulock; /* count cpus in and kickout lock */
343 cpumask_t p_vmm_cpumask; /* cpus entering or in vmm */
344 struct sys_upmap *p_upmap; /* user RO mappable per-process page */
345 forkid_t p_forkid; /* unique forkid */
346 void *p_reserveds[4]; /* reserved for future */
349 #define lwp_wchan lwp_thread->td_wchan
350 #define lwp_wmesg lwp_thread->td_wmesg
351 #define p_session p_pgrp->pg_session
352 #define p_pgid p_pgrp->pg_id
354 /* These flags are kept in p_flags. */
355 #define P_ADVLOCK 0x00001 /* Process may hold a POSIX advisory lock */
356 #define P_CONTROLT 0x00002 /* Has a controlling terminal */
357 #define P_SWAPPEDOUT 0x00004 /* Swapped out of memory */
358 #define P_SYSVSEM 0x00008 /* Might have SysV semaphores */
359 #define P_PPWAIT 0x00010 /* Parent is waiting for child to exec/exit */
360 #define P_PROFIL 0x00020 /* Has started profiling */
361 #define P_POSTEXIT 0x00040 /* Prevent procfs from stepping after this pt */
362 #define P_SCMOUSE 0x00080 /* Process is held by syscons ioctl */
363 /* was: Sleep is interruptible */
364 #define P_SUGID 0x00100 /* Had set id privileges since last exec */
365 #define P_SYSTEM 0x00200 /* System proc: no sigs, stats or swapping */
366 #define P_MAYBETHREADED 0x00400 /* might be threaded optimization */
367 #define P_TRACED 0x00800 /* Debugged process being traced */
368 #define P_WAITED 0x01000 /* SIGSTOP status was returned by wait3/4 */
369 #define P_WEXIT 0x02000 /* Working on exiting (master exit) */
370 #define P_EXEC 0x04000 /* Process called exec */
371 #define P_CONTINUED 0x08000 /* Proc has continued from a stopped state */
373 #define P_UNUSED16 0x00010000
374 #define P_UNUSED17 0x00020000
376 #define P_SWAPWAIT 0x00040000 /* Waiting for a swapin */
377 #define P_UNUSED19 0x00080000 /* was: Now in a zombied state */
379 /* Marked a kernel thread */
380 #define P_UNUSED20 0x00100000 /* was: on a user scheduling run queue */
381 #define P_KTHREADP 0x00200000 /* Process is really a kernel thread */
382 #define P_IDLESWAP 0x00400000 /* Swapout was due to idleswap, not load */
384 #define P_JAILED 0x01000000 /* Process is in jail */
385 #define P_SIGVTALRM 0x02000000 /* signal SIGVTALRM pending due to itimer */
386 #define P_SIGPROF 0x04000000 /* signal SIGPROF pending due to itimer */
387 #define P_INEXEC 0x08000000 /* Process is in execve(). */
388 #define P_UNUSED28 0x10000000
389 #define P_UNUSED29 0x20000000
390 #define P_XCPU 0x40000000 /* SIGXCPU */
392 #define LWP_ALTSTACK 0x0000001 /* have alternate signal stack */
393 #define LWP_OLDMASK 0x0000002 /* need to restore mask before pause */
394 #define LWP_SINTR 0x0000008 /* Sleep is interruptible. */
395 #define LWP_SELECT 0x0000010 /* Selecting; wakeup/waiting danger. */
396 #define LWP_UNUSED20 0x0000020
397 #define LWP_UNUSED40 0x0000040
398 #define LWP_UNUSED80 0x0000080
399 #define LWP_PASSIVE_ACQ 0x0000100 /* Passive acquire cpu (see kern_switch) */
400 #define LWP_PAGING 0x0000200 /* Currently in vm_fault */
403 * LWP_MP_WSTOP: When set the thread will stop prior to return to userland
404 * and has been counted in the process stop-threads-count, but
405 * may still be running in kernel-land.
407 * LWP_MP_WEXIT: When set the thread has been asked to exit and will not return
408 * to userland. p_nthreads will not be decremented until the
409 * thread has actually exited.
411 #define LWP_MP_ONRUNQ 0x0000001 /* on a user scheduling run queue */
412 #define LWP_MP_WEXIT 0x0000002 /* working on exiting (lwpuserret()) */
413 #define LWP_MP_WSTOP 0x0000004 /* working on stopping */
414 #define LWP_MP_ULOAD 0x0000008 /* uload accounting for current cpu */
415 #define LWP_MP_RRFORCE 0x0000010 /* forced resched due to rrcount */
416 #define LWP_MP_VNLRU 0x0000020 /* check excessive vnode allocations (lwpuserret()) */
418 #define LWP_MP_URETMASK (LWP_MP_WEXIT | LWP_MP_VNLRU)
420 #define FIRST_LWP_IN_PROC(p) RB_FIRST(lwp_rb_tree, &(p)->p_lwp_tree)
421 #define FOREACH_LWP_IN_PROC(lp, p) \
422 RB_FOREACH(lp, lwp_rb_tree, &(p)->p_lwp_tree)
423 #define ONLY_LWP_IN_PROC(p) _only_lwp_in_proc(p, __func__)
426 static inline struct lwp *
427 _only_lwp_in_proc(struct proc *p, const char *caller)
429 if (p->p_nthreads != 1) {
430 panic("%s: proc %p (pid %d cmd %s) has more than one thread",
431 caller, p, p->p_pid, p->p_comm);
433 return RB_ROOT(&p->p_lwp_tree);
438 * We use process IDs <= PID_MAX. NO_PID must also fit in a pid_t and
439 * is used to represent "no process group".
441 #define PID_MAX 999999
442 #define NO_PID 0x7FFFFFFF
444 #define SESS_LEADER(p) ((p)->p_session->s_leader == (p))
448 #ifdef MALLOC_DECLARE
449 MALLOC_DECLARE(M_SESSION);
450 MALLOC_DECLARE(M_PROC);
451 MALLOC_DECLARE(M_LWP);
452 MALLOC_DECLARE(M_SUBPROC);
453 MALLOC_DECLARE(M_PARGS);
456 /* for priv_check_cred() */
457 #define NULL_CRED_OKAY 0x2
459 /* Handy macro to determine if p1 can mangle p2 */
461 #define PRISON_CHECK(cr1, cr2) \
462 ((!(cr1)->cr_prison) || (cr1)->cr_prison == (cr2)->cr_prison)
467 extern void stopevent(struct proc*, unsigned int, unsigned int);
468 #define STOPEVENT(p,e,v) \
470 if ((p)->p_stops & (e)) { \
476 * Hold process in memory, don't destruct, used by ktrace, procfs, sigio,
477 * and signaling code (e.g. ksignal()).
481 #define PHOLD(p) phold((p))
482 #define PRELE(p) prele((p))
483 #define PHOLDZOMB(p) pholdzomb((p))
484 #define PRELEZOMB(p) prelezomb((p))
485 #define PSTALL(p, msg, n) \
486 do { if ((p)->p_lock > (n)) pstall((p), (msg), (n)); } while (0)
489 * Hold lwp in memory, don't destruct, normally for ptrace/procfs work
490 * atomic ops because they can occur from an IPI.
493 #define LWPHOLD(lp) atomic_add_int(&(lp)->lwp_lock, 1)
494 #define LWPRELE(lp) atomic_add_int(&(lp)->lwp_lock, -1)
496 extern struct proc proc0; /* Process slot for swapper. */
497 extern struct lwp lwp0; /* LWP slot for swapper. */
498 extern struct thread thread0; /* Thread slot for swapper. */
499 extern int hogticks; /* Limit on kernel cpu hogs. */
500 extern int nprocs, maxproc; /* Current and max number of procs. */
501 extern int maxprocperuid; /* Max procs per uid. */
502 extern int sched_quantum; /* Scheduling quantum in ticks */
504 extern struct proc *initproc; /* Process slot for init */
505 extern struct thread *pagethread, *updatethread;
508 * Scheduler independant variables. The primary scheduler polling frequency,
509 * the maximum ESTCPU value, and the weighting factor for nice values. A
510 * cpu bound program's estcpu will increase to ESTCPUMAX - 1.
512 #define ESTCPUFREQ 50
514 extern u_long ps_arg_cache_limit;
515 extern int ps_argsopen;
516 extern int ps_showallprocs;
518 struct proc *pfind (pid_t); /* Find process by id w/ref */
519 struct proc *pfindn (pid_t); /* Find process by id wo/ref */
520 struct pgrp *pgfind (pid_t); /* Find process group by id w/ref */
521 struct proc *zpfind (pid_t); /* Find zombie process by id w/ref */
522 void pgref (struct pgrp *); /* Ref pgrp preventing disposal */
523 void pgrel (struct pgrp *); /* Deref pgrp & dispose on 1->0 trans */
528 int enterpgrp (struct proc *p, pid_t pgid, int mksess);
529 void proc_add_allproc(struct proc *p);
530 void proc_move_allproc_zombie(struct proc *);
531 void proc_remove_zombie(struct proc *);
532 void allproc_scan(int (*callback)(struct proc *, void *), void *data);
533 void alllwp_scan(int (*callback)(struct lwp *, void *), void *data);
534 void zombproc_scan(int (*callback)(struct proc *, void *), void *data);
535 void fixjobc (struct proc *p, struct pgrp *pgrp, int entering);
536 void updatepcpu(struct lwp *, int, int);
537 int inferior (struct proc *p);
538 int leavepgrp (struct proc *p);
539 void sess_hold(struct session *sp);
540 void sess_rele(struct session *sp);
541 void procinit (void);
542 void procinsertinit(struct proc *p);
543 void sessinsertinit(struct session *sess);
544 void pgrpinsertinit(struct pgrp *pg);
545 void relscurproc(struct proc *curp);
546 int p_trespass (struct ucred *cr1, struct ucred *cr2);
547 void setrunnable (struct lwp *);
548 void proc_stop (struct proc *);
549 void proc_unstop (struct proc *);
550 void sleep_gdinit (struct globaldata *);
551 thread_t cpu_heavy_switch (struct thread *);
552 thread_t cpu_lwkt_switch (struct thread *);
554 void cpu_lwp_exit (void) __dead2;
555 void cpu_thread_exit (void) __dead2;
556 void lwp_exit (int masterexit, void *waddr) __dead2;
557 void lwp_dispose (struct lwp *);
558 int killalllwps (int);
559 void exit1 (int) __dead2;
560 void cpu_fork (struct lwp *, struct lwp *, int);
561 int cpu_prepare_lwp(struct lwp *, struct lwp_params *);
562 void cpu_set_fork_handler (struct lwp *, void (*)(void *, struct trapframe *), void *);
563 void cpu_set_thread_handler(struct thread *td, void (*retfunc)(void), void *func, void *arg);
564 int fork1 (struct lwp *, int, struct proc **);
565 void start_forked_proc (struct lwp *, struct proc *);
566 int trace_req (struct proc *);
567 void cpu_thread_wait (struct thread *);
568 void setsugid (void);
569 void faultin (struct proc *p);
570 void swapin_request (void);
571 void phold (struct proc *);
572 void prele (struct proc *);
573 int pholdzomb (struct proc *);
574 void prelezomb (struct proc *);
575 void pstall (struct proc *, const char *, int);
576 void lwpuserret(struct lwp *);
577 void lwpkthreaddeferred(void);
578 void proc_usermap(struct proc *p, int invfork);
579 void proc_userunmap(struct proc *p);
581 u_int32_t procrunnable (void);
585 #endif /* _KERNEL || _KERNEL_STRUCTURES */
586 #endif /* !_SYS_PROC_H_ */