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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 $
45 #if !defined(_KERNEL) && !defined(_KERNEL_STRUCTURES)
47 #error "Userland must include sys/user.h instead of sys/proc.h"
51 #include <sys/callout.h> /* For struct callout_handle. */
52 #include <sys/filedesc.h>
53 #include <sys/queue.h>
55 #include <sys/rtprio.h> /* For struct rtprio. */
56 #include <sys/signal.h>
59 #include <sys/time.h> /* For structs itimerval, timeval. */
61 #include <sys/ucred.h>
62 #include <sys/event.h> /* For struct klist */
63 #include <sys/eventvar.h>
64 #include <sys/sysent.h> /* For struct sysentvec */
65 #include <sys/thread.h>
66 #include <sys/varsym.h>
67 #include <sys/upcall.h>
68 #include <sys/resourcevar.h>
70 #include <sys/globaldata.h>
72 #include <sys/systimer.h>
73 #include <sys/iosched.h>
74 #include <sys/usched.h>
75 #include <machine/proc.h> /* Machine-dependent proc substruct. */
76 #include <machine/atomic.h> /* Machine-dependent proc substruct. */
77 #include <sys/signalvar.h>
79 LIST_HEAD(proclist, proc);
80 LIST_HEAD(lwplist, lwp);
83 RB_HEAD(lwp_rb_tree, lwp);
84 RB_PROTOTYPE2(lwp_rb_tree, lwp, u.lwp_rbnode, rb_lwp_compare, lwpid_t);
87 * One structure allocated per session.
90 int s_count; /* Ref cnt; pgrps in session. */
91 struct proc *s_leader; /* Session leader. */
92 struct vnode *s_ttyvp; /* Vnode of controlling terminal. */
93 struct tty *s_ttyp; /* Controlling terminal. */
94 pid_t s_sid; /* Session ID */
95 char s_login[roundup(MAXLOGNAME, sizeof(long))]; /* Setlogin() name. */
99 * One structure allocated per process group.
102 LIST_ENTRY(pgrp) pg_hash; /* Hash chain. */
103 struct proclist pg_members; /* Pointer to pgrp members. */
104 struct session *pg_session; /* Pointer to session. */
105 struct sigiolst pg_sigiolst; /* List of sigio sources. */
106 pid_t pg_id; /* Pgrp id. */
107 int pg_jobc; /* # procs qualifying pgrp for job control */
109 struct lwkt_token pg_token;
113 #define PS_NOCLDWAIT 0x0001 /* No zombies if child dies */
114 #define PS_NOCLDSTOP 0x0002 /* No SIGCHLD when children stop. */
115 #define PS_CLDSIGIGN 0x0004 /* The SIGCHLD handler is SIG_IGN. */
118 * pargs, used to hold a copy of the command line, if it had a sane
122 u_int ar_ref; /* Reference count */
123 u_int ar_length; /* Length */
124 u_char ar_args[0]; /* Arguments */
128 * Description of a process.
130 * This structure contains the information needed to manage a thread of
131 * control, known in UN*X as a process; it has references to substructures
132 * containing descriptions of things that the process uses, but may share
133 * with related processes. The process structure and the substructures
134 * are always addressable except for those marked "(PROC ONLY)" below,
135 * which might be addressable only on a processor on which the process
138 * NOTE! The process start time is stored in the thread structure associated
139 * with the process. If the process is a Zombie, then this field will be
140 * inaccessible due to the thread structure being free'd in kern_wait1().
146 struct vmspace_entry;
164 TAILQ_ENTRY(lwp) lwp_procq; /* run/sleep queue. */
166 RB_ENTRY(lwp) lwp_rbnode; /* RB tree node - lwp in proc */
167 LIST_ENTRY(lwp) lwp_reap_entry; /* reaper list */
170 struct proc *lwp_proc; /* Link to our proc. */
171 struct vmspace *lwp_vmspace; /* Inherited from p_vmspace */
172 struct vkernel_lwp *lwp_vkernel;/* VKernel support, lwp part */
174 lwpid_t lwp_tid; /* Our thread id */
176 u_int lwp_flags; /* LWP_* flags */
177 u_int lwp_mpflags; /* LWP_MP_* flags */
178 enum lwpstat lwp_stat; /* LS* lwp status */
179 int lwp_lock; /* lwp lock (prevent destruct) count */
181 int lwp_dupfd; /* Sideways return value from fdopen */
184 * The following two fields are marked XXX since (at least) the
185 * 4.4BSD-Lite2 import. I can only guess the reason: It is ugly.
186 * These fields are used to pass the trap code from trapsignal() to
187 * postsig(), which gets called later from userret().
189 * The correct "fix" for these XXX is to convert our signal system
190 * to use signal queues, where each signal can carry its own meta
193 int lwp_sig; /* for core dump/debugger XXX */
194 u_long lwp_code; /* for core dump/debugger XXX */
199 sysclock_t lwp_cpticks; /* cpu used in sched clock ticks */
200 sysclock_t lwp_cpbase; /* Measurement base */
201 fixpt_t lwp_pctcpu; /* %cpu for this process */
202 u_int lwp_slptime; /* Time since last blocked. */
203 u_int lwp_rebal_ticks; /* Timestamp sched on current cpu */
205 int lwp_traceflag; /* Kernel trace points. */
207 struct rusage lwp_ru; /* stats for this lwp */
209 union usched_data lwp_usdata; /* User scheduler specific */
211 #define lwp_startcopy lwp_cpumask
212 cpumask_t lwp_cpumask;
213 sigset_t lwp_siglist; /* Signals arrived but not delivered. */
214 sigset_t lwp_oldsigmask; /* saved mask from before sigpause */
215 sigset_t lwp_sigmask; /* Current signal mask. */
216 stack_t lwp_sigstk; /* sp & on stack state variable */
218 struct rtprio lwp_rtprio; /* Realtime priority. */
219 #define lwp_endcopy lwp_md
221 struct mdproc lwp_md; /* Any machine-dependent fields. */
223 struct thread *lwp_thread; /* backpointer to proc's thread */
224 struct upcall *lwp_upcall; /* REGISTERED USERLAND POINTER! */
225 struct kqueue lwp_kqueue; /* for select/poll */
226 u_int lwp_kqueue_serial;
227 struct lwkt_token lwp_token; /* per-lwp token for signal/state */
228 struct spinlock lwp_spin; /* spinlock for signal handling */
229 void *lwp_reserveds1; /* reserved for lwp_saveusp */
230 void *lwp_reserveds2; /* reserved for lwp_saveupc */
234 LIST_ENTRY(proc) p_list; /* List of all processes. */
237 struct ucred *p_ucred; /* Process owner's identity. */
238 struct filedesc *p_fd; /* Ptr to open files structure. */
239 struct filedesc_to_leader *p_fdtol; /* Ptr to tracking node XXX lwp */
240 struct plimit *p_limit; /* Process limits. */
241 struct pstats *p_stats;
242 u_int p_mqueue_cnt; /* Count of open mqueues. */
244 struct sigacts *p_sigacts;
245 #define p_sigignore p_sigacts->ps_sigignore
246 #define p_sigcatch p_sigacts->ps_sigcatch
247 #define p_rlimit p_limit->pl_rlimit
249 int p_flags; /* P_* flags. */
250 enum procstat p_stat; /* S* process status. */
253 pid_t p_pid; /* Process identifier. */
254 LIST_ENTRY(proc) p_hash; /* Hash chain. */
255 LIST_ENTRY(proc) p_pglist; /* List of processes in pgrp. */
256 struct proc *p_pptr; /* Pointer to parent process. */
257 LIST_ENTRY(proc) p_sibling; /* List of sibling processes. */
258 struct proclist p_children; /* Pointer to list of children. */
259 struct callout p_ithandle; /* for scheduling p_realtimer */
260 struct varsymset p_varsymset;
261 struct iosched_data p_iosdata; /* Dynamic I/O scheduling data */
263 pid_t p_oppid; /* Save parent pid during ptrace. XXX */
265 struct vmspace *p_vmspace; /* Current address space. */
267 unsigned int p_swtime; /* Time swapped in or out */
269 struct itimerval p_realtimer; /* Alarm timer. */
270 struct itimerval p_timer[3]; /* Virtual-time timers. */
272 int p_traceflag; /* Kernel trace points. */
273 struct ktrace_node *p_tracenode; /* Trace to vnode. */
275 sigset_t p_siglist; /* Signals arrived but not delivered. */
277 struct vnode *p_textvp; /* Vnode of executable. */
278 struct nchandle p_textnch; /* namecache handle of executable. */
280 unsigned int p_stops; /* procfs event bitmask */
281 unsigned int p_stype; /* procfs stop event type */
282 char p_step; /* procfs stop *once* flag */
283 unsigned char p_pfsflags; /* procfs flags */
284 char p_pad2[2]; /* padding for alignment */
285 struct sigiolst p_sigiolst; /* list of sigio sources */
286 int p_sigparent; /* signal to parent on exit */
287 struct klist p_klist; /* knotes attached to this process */
289 struct timeval p_start; /* start time for a process */
291 struct rusage p_ru; /* stats for this proc */
292 struct rusage p_cru; /* sum of stats for reaped children */
293 void *p_dsched_priv1;
295 /* The following fields are all copied upon creation in fork. */
296 #define p_startcopy p_comm
298 char p_comm[MAXCOMLEN+1]; /* typ 16+1 bytes */
299 char p_pad3; /* Process lock (prevent destruct) count. */
300 char p_nice; /* Process "nice" value. */
302 int p_osrel; /* release date for binary ELF note */
304 struct pgrp *p_pgrp; /* Pointer to process group. */
306 struct sysentvec *p_sysent; /* System call dispatch information. */
308 struct uprof p_prof; /* Profiling arguments. */
309 struct rtprio p_rtprio; /* Realtime priority. */
310 struct pargs *p_args;
311 u_short p_xstat; /* Exit status or last stop signal */
314 void *p_dsched_priv2;
315 /* End area that is copied on creation. */
316 #define p_endcopy p_dsched_priv2
317 u_short p_acflag; /* Accounting flags. */
319 int p_lock; /* Prevent proc destruction */
320 int p_nthreads; /* Number of threads in this process. */
321 int p_nstopped; /* Number of stopped threads. */
322 int p_lasttid; /* Last tid used. */
323 struct lwp_rb_tree p_lwp_tree; /* RB tree of LWPs for this process */
324 void *p_aioinfo; /* ASYNC I/O info */
325 int p_wakeup; /* thread id XXX lwp */
326 struct proc *p_peers; /* XXX lwp */
327 struct proc *p_leader; /* XXX lwp */
328 void *p_emuldata; /* process-specific emulator state */
329 struct usched *p_usched; /* Userland scheduling control */
330 struct vkernel_proc *p_vkernel; /* VKernel support, proc part */
331 int p_numposixlocks; /* number of POSIX locks */
332 void (*p_userret)(void);/* p: return-to-user hook */
334 struct spinlock p_spin; /* Spinlock for LWP access to proc */
335 struct lwkt_token p_token; /* Token for LWP access to proc */
336 struct sem_undo *p_sem_undo; /* Fast semaphore tracking lookup */
339 #define lwp_wchan lwp_thread->td_wchan
340 #define lwp_wmesg lwp_thread->td_wmesg
341 #define p_session p_pgrp->pg_session
342 #define p_pgid p_pgrp->pg_id
344 /* These flags are kept in p_flags. */
345 #define P_ADVLOCK 0x00001 /* Process may hold a POSIX advisory lock */
346 #define P_CONTROLT 0x00002 /* Has a controlling terminal */
347 #define P_SWAPPEDOUT 0x00004 /* Swapped out of memory */
348 #define P_SYSVSEM 0x00008 /* Might have SysV semaphores */
349 #define P_PPWAIT 0x00010 /* Parent is waiting for child to exec/exit */
350 #define P_PROFIL 0x00020 /* Has started profiling */
351 #define P_POSTEXIT 0x00040 /* Prevent procfs from stepping after this pt */
352 #define P_UNUSED7 0x00080 /* was: Sleep is interruptible */
353 #define P_SUGID 0x00100 /* Had set id privileges since last exec */
354 #define P_SYSTEM 0x00200 /* System proc: no sigs, stats or swapping */
355 #define P_UNUSED10 0x00400 /* was: SIGSTOP status */
356 #define P_TRACED 0x00800 /* Debugged process being traced */
357 #define P_WAITED 0x01000 /* SIGSTOP status was returned by wait3/4 */
358 #define P_WEXIT 0x02000 /* Working on exiting (master exit) */
359 #define P_EXEC 0x04000 /* Process called exec */
360 #define P_CONTINUED 0x08000 /* Proc has continued from a stopped state */
362 #define P_UNUSED16 0x00010000
363 #define P_UPCALLPEND 0x00020000 /* an upcall is pending */
365 #define P_SWAPWAIT 0x00040000 /* Waiting for a swapin */
366 #define P_UNUSED19 0x00080000 /* was: Now in a zombied state */
368 /* Marked a kernel thread */
369 #define P_UNUSED20 0x00100000 /* was: on a user scheduling run queue */
370 #define P_KTHREADP 0x00200000 /* Process is really a kernel thread */
371 #define P_IDLESWAP 0x00400000 /* Swapout was due to idleswap, not load */
373 #define P_JAILED 0x01000000 /* Process is in jail */
374 #define P_SIGVTALRM 0x02000000 /* signal SIGVTALRM pending due to itimer */
375 #define P_SIGPROF 0x04000000 /* signal SIGPROF pending due to itimer */
376 #define P_INEXEC 0x08000000 /* Process is in execve(). */
377 #define P_UNUSED28 0x10000000
378 #define P_UPCALLWAIT 0x20000000 /* Wait for upcall or signal */
379 #define P_XCPU 0x40000000 /* SIGXCPU */
381 #define LWP_ALTSTACK 0x0000001 /* have alternate signal stack */
382 #define LWP_OLDMASK 0x0000002 /* need to restore mask before pause */
383 #define LWP_SINTR 0x0000008 /* Sleep is interruptible. */
384 #define LWP_SELECT 0x0000010 /* Selecting; wakeup/waiting danger. */
385 #define LWP_UNUSED20 0x0000020
386 #define LWP_UNUSED40 0x0000040
387 #define LWP_UNUSED80 0x0000080
388 #define LWP_PASSIVE_ACQ 0x0000100 /* Passive acquire cpu (see kern_switch) */
389 #define LWP_PAGING 0x0000200 /* Currently in vm_fault */
392 * LWP_MP_WSTOP: When set the thread will stop prior to return to userland
393 * and has been counted in the process stop-threads-count, but
394 * may still be running in kernel-land.
396 * LWP_MP_WEXIT: When set the thread has been asked to exit and will not return
397 * to userland. p_nthreads will not be decremented until the
398 * thread has actually exited.
400 #define LWP_MP_ONRUNQ 0x0000001 /* on a user scheduling run queue */
401 #define LWP_MP_WEXIT 0x0000002 /* working on exiting (lwpuserret()) */
402 #define LWP_MP_WSTOP 0x0000004 /* working on stopping */
403 #define LWP_MP_ULOAD 0x0000008 /* uload accounting for current cpu */
404 #define LWP_MP_RRFORCE 0x0000010 /* forced resched due to rrcount */
405 #define LWP_MP_VNLRU 0x0000020 /* check excessive vnode allocations (lwpuserret()) */
407 #define LWP_MP_URETMASK (LWP_MP_WEXIT | LWP_MP_VNLRU)
409 #define FIRST_LWP_IN_PROC(p) RB_FIRST(lwp_rb_tree, &(p)->p_lwp_tree)
410 #define FOREACH_LWP_IN_PROC(lp, p) \
411 RB_FOREACH(lp, lwp_rb_tree, &(p)->p_lwp_tree)
412 #define ONLY_LWP_IN_PROC(p) \
413 (p->p_nthreads != 1 && \
414 (panic("%s: proc %p (pid %d cmd %s) has more than one thread", \
415 __func__, p, p->p_pid, p->p_comm), 1), \
416 RB_ROOT(&p->p_lwp_tree))
419 * We use process IDs <= PID_MAX; PID_MAX + 1 must also fit in a pid_t,
420 * as it is used to represent "no process group".
422 #define PID_MAX 99999
423 #define NO_PID 100000
425 #define SESS_LEADER(p) ((p)->p_session->s_leader == (p))
429 #ifdef MALLOC_DECLARE
430 MALLOC_DECLARE(M_SESSION);
431 MALLOC_DECLARE(M_PROC);
432 MALLOC_DECLARE(M_LWP);
433 MALLOC_DECLARE(M_SUBPROC);
434 MALLOC_DECLARE(M_PARGS);
437 /* for priv_check_cred() */
438 #define NULL_CRED_OKAY 0x2
440 /* Handy macro to determine if p1 can mangle p2 */
442 #define PRISON_CHECK(cr1, cr2) \
443 ((!(cr1)->cr_prison) || (cr1)->cr_prison == (cr2)->cr_prison)
448 extern void stopevent(struct proc*, unsigned int, unsigned int);
449 #define STOPEVENT(p,e,v) \
451 if ((p)->p_stops & (e)) { \
457 * Hold process in memory, don't destruct, used by ktrace, procfs, sigio,
458 * and signaling code (e.g. ksignal()).
462 #define PHOLD(p) phold((p))
463 #define PRELE(p) prele((p))
464 #define PHOLDZOMB(p) pholdzomb((p))
465 #define PRELEZOMB(p) prelezomb((p))
466 #define PSTALL(p, msg, n) \
467 do { if ((p)->p_lock > (n)) pstall((p), (msg), (n)); } while (0)
470 * Hold lwp in memory, don't destruct, normally for ptrace/procfs work
471 * atomic ops because they can occur from an IPI.
474 #define LWPHOLD(lp) atomic_add_int(&(lp)->lwp_lock, 1)
475 #define LWPRELE(lp) atomic_add_int(&(lp)->lwp_lock, -1)
477 #define PIDHASH(pid) (&pidhashtbl[(pid) & pidhash])
478 extern LIST_HEAD(pidhashhead, proc) *pidhashtbl;
479 extern u_long pidhash;
481 #define PGRPHASH(pgid) (&pgrphashtbl[(pgid) & pgrphash])
482 extern LIST_HEAD(pgrphashhead, pgrp) *pgrphashtbl;
483 extern u_long pgrphash;
487 #define SET_CURPROC(p) (curproc = (p))
491 extern struct proc proc0; /* Process slot for swapper. */
492 extern struct lwp lwp0; /* LWP slot for swapper. */
493 extern struct thread thread0; /* Thread slot for swapper. */
494 extern int hogticks; /* Limit on kernel cpu hogs. */
495 extern int nprocs, maxproc; /* Current and max number of procs. */
496 extern int maxprocperuid; /* Max procs per uid. */
497 extern int sched_quantum; /* Scheduling quantum in ticks */
499 extern struct proclist allproc; /* List of all processes. */
500 extern struct proclist zombproc; /* List of zombie processes. */
501 extern struct proc *initproc; /* Process slot for init */
502 extern struct thread *pagethread, *updatethread;
505 * Scheduler independant variables. The primary scheduler polling frequency,
506 * the maximum ESTCPU value, and the weighting factor for nice values. A
507 * cpu bound program's estcpu will increase to ESTCPUMAX - 1.
509 #define ESTCPUFREQ 50
511 extern u_long ps_arg_cache_limit;
512 extern int ps_argsopen;
513 extern int ps_showallprocs;
515 struct proc *pfind (pid_t); /* Find process by id w/ref */
516 struct proc *pfindn (pid_t); /* Find process by id wo/ref */
517 struct pgrp *pgfind (pid_t); /* Find process group by id w/ref */
518 struct proc *zpfind (pid_t); /* Find zombie process by id w/ref */
519 void pgref (struct pgrp *); /* Ref pgrp preventing disposal */
520 void pgrel (struct pgrp *); /* Deref pgrp & dispose on 1->0 trans */
525 int enterpgrp (struct proc *p, pid_t pgid, int mksess);
526 void proc_add_allproc(struct proc *p);
527 void proc_move_allproc_zombie(struct proc *);
528 void proc_remove_zombie(struct proc *);
529 void allproc_scan(int (*callback)(struct proc *, void *), void *data);
530 void alllwp_scan(int (*callback)(struct lwp *, void *), void *data);
531 void zombproc_scan(int (*callback)(struct proc *, void *), void *data);
532 void fixjobc (struct proc *p, struct pgrp *pgrp, int entering);
533 void updatepcpu(struct lwp *, int, int);
534 int inferior (struct proc *p);
535 int leavepgrp (struct proc *p);
536 void sess_hold(struct session *sp);
537 void sess_rele(struct session *sp);
538 void procinit (void);
539 void relscurproc(struct proc *curp);
540 int p_trespass (struct ucred *cr1, struct ucred *cr2);
541 void setrunnable (struct lwp *);
542 void proc_stop (struct proc *);
543 void proc_unstop (struct proc *);
544 void sleep_gdinit (struct globaldata *);
545 int suser (struct thread *td);
546 int suser_cred (struct ucred *cred, int flag);
547 thread_t cpu_heavy_switch (struct thread *);
548 thread_t cpu_lwkt_switch (struct thread *);
550 void cpu_lwp_exit (void) __dead2;
551 void cpu_thread_exit (void) __dead2;
552 void lwp_exit (int masterexit) __dead2;
553 void lwp_dispose (struct lwp *);
554 int killalllwps (int);
555 void exit1 (int) __dead2;
556 void cpu_fork (struct lwp *, struct lwp *, int);
557 int cpu_prepare_lwp(struct lwp *, struct lwp_params *);
558 void cpu_set_fork_handler (struct lwp *, void (*)(void *, struct trapframe *), void *);
559 void cpu_set_thread_handler(struct thread *td, void (*retfunc)(void), void *func, void *arg);
560 int fork1 (struct lwp *, int, struct proc **);
561 void start_forked_proc (struct lwp *, struct proc *);
562 int trace_req (struct proc *);
563 void cpu_thread_wait (struct thread *);
564 void setsugid (void);
565 void faultin (struct proc *p);
566 void swapin_request (void);
567 void phold (struct proc *);
568 void prele (struct proc *);
569 int pholdzomb (struct proc *);
570 void prelezomb (struct proc *);
571 void pstall (struct proc *, const char *, int);
572 void lwpuserret(struct lwp *);
573 void lwpkthreaddeferred(void);
575 u_int32_t procrunnable (void);
579 #endif /* _KERNEL || _KERNEL_STRUCTURES */
580 #endif /* !_SYS_PROC_H_ */