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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/resourcevar.h>
69 #include <sys/globaldata.h>
71 #include <sys/systimer.h>
72 #include <sys/iosched.h>
73 #include <sys/usched.h>
74 #include <machine/proc.h> /* Machine-dependent proc substruct. */
75 #include <machine/atomic.h> /* Machine-dependent proc substruct. */
76 #include <sys/signalvar.h>
83 LIST_HEAD(proclist, proc);
84 LIST_HEAD(pgrplist, pgrp);
85 LIST_HEAD(sesslist, session);
86 LIST_HEAD(lwplist, lwp);
89 RB_HEAD(lwp_rb_tree, lwp);
90 RB_PROTOTYPE2(lwp_rb_tree, lwp, u.lwp_rbnode, rb_lwp_compare, lwpid_t);
93 * One structure allocated per session.
96 LIST_ENTRY(session) s_list; /* Hash chain. */
97 int s_count; /* Ref cnt; pgrps in session. */
98 struct proc *s_leader; /* Session leader. */
99 struct vnode *s_ttyvp; /* Vnode of controlling terminal. */
100 struct tty *s_ttyp; /* Controlling terminal. */
101 pid_t s_sid; /* Session ID */
102 char s_login[roundup(MAXLOGNAME, sizeof(long))]; /* Setlogin() name. */
106 * One structure allocated per process group.
109 LIST_ENTRY(pgrp) pg_list; /* Hash chain. */
110 struct proclist pg_members; /* Pointer to pgrp members. */
111 struct session *pg_session; /* Pointer to session. */
112 struct sigiolst pg_sigiolst; /* List of sigio sources. */
113 pid_t pg_id; /* Pgrp id. */
114 int pg_jobc; /* # procs qualifying pgrp for job control */
116 struct lwkt_token pg_token;
120 #define PS_NOCLDWAIT 0x0001 /* No zombies if child dies */
121 #define PS_NOCLDSTOP 0x0002 /* No SIGCHLD when children stop. */
122 #define PS_CLDSIGIGN 0x0004 /* The SIGCHLD handler is SIG_IGN. */
125 * pargs, used to hold a copy of the command line, if it had a sane
129 u_int ar_ref; /* Reference count */
130 u_int ar_length; /* Length */
131 u_char ar_args[0]; /* Arguments */
135 * Description of a process.
137 * This structure contains the information needed to manage a thread of
138 * control, known in UN*X as a process; it has references to substructures
139 * containing descriptions of things that the process uses, but may share
140 * with related processes. The process structure and the substructures
141 * are always addressable except for those marked "(PROC ONLY)" below,
142 * which might be addressable only on a processor on which the process
145 * NOTE! The process start time is stored in the thread structure associated
146 * with the process. If the process is a Zombie, then this field will be
147 * inaccessible due to the thread structure being free'd in kern_wait1().
153 struct vmspace_entry;
171 TAILQ_ENTRY(lwp) lwp_procq; /* run/sleep queue. */
173 RB_ENTRY(lwp) lwp_rbnode; /* RB tree node - lwp in proc */
174 LIST_ENTRY(lwp) lwp_reap_entry; /* reaper list */
177 struct proc *lwp_proc; /* Link to our proc. */
178 struct vmspace *lwp_vmspace; /* Inherited from p_vmspace */
179 struct vkernel_lwp *lwp_vkernel;/* VKernel support, lwp part */
181 lwpid_t lwp_tid; /* Our thread id */
183 u_int lwp_flags; /* LWP_* flags */
184 u_int lwp_mpflags; /* LWP_MP_* flags */
185 enum lwpstat lwp_stat; /* LS* lwp status */
186 int lwp_lock; /* lwp lock (prevent destruct) count */
188 int lwp_dupfd; /* Sideways return value from fdopen */
191 * The following two fields are marked XXX since (at least) the
192 * 4.4BSD-Lite2 import. I can only guess the reason: It is ugly.
193 * These fields are used to pass the trap code from trapsignal() to
194 * postsig(), which gets called later from userret().
196 * The correct "fix" for these XXX is to convert our signal system
197 * to use signal queues, where each signal can carry its own meta
200 int lwp_sig; /* for core dump/debugger XXX */
201 u_long lwp_code; /* for core dump/debugger XXX */
206 sysclock_t lwp_cpticks; /* cpu used in sched clock ticks */
207 sysclock_t lwp_cpbase; /* Measurement base */
208 fixpt_t lwp_pctcpu; /* %cpu for this process */
209 u_int lwp_slptime; /* Time since last blocked. */
210 u_int lwp_rebal_ticks; /* Timestamp sched on current cpu */
212 int lwp_traceflag; /* Kernel trace points. */
214 struct rusage lwp_ru; /* stats for this lwp */
216 union usched_data lwp_usdata; /* User scheduler specific */
218 #define lwp_startcopy lwp_cpumask
219 cpumask_t lwp_cpumask;
220 sigset_t lwp_siglist; /* Signals arrived but not delivered. */
221 sigset_t lwp_oldsigmask; /* saved mask from before sigpause */
222 sigset_t lwp_sigmask; /* Current signal mask. */
223 stack_t lwp_sigstk; /* sp & on stack state variable */
225 struct rtprio lwp_rtprio; /* Realtime priority. */
226 #define lwp_endcopy lwp_md
228 struct mdproc lwp_md; /* Any machine-dependent fields. */
230 struct thread *lwp_thread; /* backpointer to proc's thread */
231 void *lwp_unused01; /* for future fields */
232 struct kqueue lwp_kqueue; /* for select/poll */
233 u_int lwp_kqueue_serial;
234 struct lwkt_token lwp_token; /* per-lwp token for signal/state */
235 struct spinlock lwp_spin; /* spinlock for signal handling */
236 void *lwp_reserveds1; /* reserved for lwp_saveusp */
237 void *lwp_reserveds2; /* reserved for lwp_saveupc */
241 LIST_ENTRY(proc) p_list; /* List of all processes. */
244 struct ucred *p_ucred; /* Process owner's identity. */
245 struct filedesc *p_fd; /* Ptr to open files structure. */
246 struct filedesc_to_leader *p_fdtol; /* Ptr to tracking node XXX lwp */
247 struct plimit *p_limit; /* Process limits. */
248 struct pstats *p_stats;
249 u_int p_mqueue_cnt; /* Count of open mqueues. */
250 long p_waitgen; /* wait interlock allows late signal */
251 struct sigacts *p_sigacts;
252 #define p_sigignore p_sigacts->ps_sigignore
253 #define p_sigcatch p_sigacts->ps_sigcatch
254 #define p_rlimit p_limit->pl_rlimit
256 int p_flags; /* P_* flags. */
257 enum procstat p_stat; /* S* process status. */
260 pid_t p_pid; /* Process identifier. */
261 LIST_ENTRY(proc) p_pglist; /* List of processes in pgrp. */
262 struct proc *p_pptr; /* Pointer to parent process. */
263 LIST_ENTRY(proc) p_sibling; /* List of sibling processes. */
264 struct proclist p_children; /* Pointer to list of children. */
265 struct callout p_ithandle; /* for scheduling p_realtimer */
266 struct varsymset p_varsymset;
267 struct iosched_data p_iosdata; /* Dynamic I/O scheduling data */
269 pid_t p_oppid; /* Save parent pid during ptrace. XXX */
271 struct vmspace *p_vmspace; /* Current address space. */
273 unsigned int p_swtime; /* Time swapped in or out */
275 struct itimerval p_realtimer; /* Alarm timer. */
276 struct itimerval p_timer[3]; /* Virtual-time timers. */
278 int p_traceflag; /* Kernel trace points. */
279 struct ktrace_node *p_tracenode; /* Trace to vnode. */
281 sigset_t p_siglist; /* Signals arrived but not delivered. */
283 struct vnode *p_textvp; /* Vnode of executable. */
284 struct nchandle p_textnch; /* namecache handle of executable. */
286 unsigned int p_stops; /* procfs event bitmask */
287 unsigned int p_stype; /* procfs stop event type */
288 char p_step; /* procfs stop *once* flag */
289 unsigned char p_pfsflags; /* procfs flags */
291 struct sigiolst p_sigiolst; /* list of sigio sources */
292 int p_sigparent; /* signal to parent on exit */
293 struct klist p_klist; /* knotes attached to this process */
295 struct timeval p_start; /* start time for a process */
297 struct rusage p_ru; /* stats for this proc */
298 struct rusage p_cru; /* sum of stats for reaped children */
299 void *p_dsched_priv1;
301 /* The following fields are all copied upon creation in fork. */
302 #define p_startcopy p_comm
304 char p_comm[MAXCOMLEN+1]; /* typ 16+1 bytes */
306 char p_nice; /* Process "nice" value. */
308 int p_osrel; /* release date for binary ELF note */
310 struct pgrp *p_pgrp; /* Pointer to process group. */
312 struct sysentvec *p_sysent; /* System call dispatch information. */
314 struct uprof p_prof; /* Profiling arguments. */
315 struct rtprio p_rtprio; /* Realtime priority. */
316 struct pargs *p_args;
317 u_short p_xstat; /* Exit status or last stop signal */
320 void *p_dsched_priv2;
321 /* End area that is copied on creation. */
322 #define p_endcopy p_dsched_priv2
323 u_short p_acflag; /* Accounting flags. */
325 int p_lock; /* Prevent proc destruction */
326 int p_nthreads; /* Number of threads in this process. */
327 int p_nstopped; /* Number of stopped threads. */
328 int p_lasttid; /* Last tid used. */
329 struct lwp_rb_tree p_lwp_tree; /* RB tree of LWPs for this process */
330 void *p_aioinfo; /* ASYNC I/O info */
331 int p_wakeup; /* thread id XXX lwp */
332 struct proc *p_peers; /* XXX lwp */
333 struct proc *p_leader; /* XXX lwp */
334 void *p_emuldata; /* process-specific emulator state */
335 struct usched *p_usched; /* Userland scheduling control */
336 struct vkernel_proc *p_vkernel; /* VKernel support, proc part */
337 int p_numposixlocks; /* number of POSIX locks */
338 void (*p_userret)(void);/* p: return-to-user hook */
340 struct spinlock p_spin; /* Spinlock for LWP access to proc */
341 struct lwkt_token p_token; /* Token for LWP access to proc */
342 struct sem_undo *p_sem_undo; /* Fast semaphore tracking lookup */
343 void *p_drv_priv; /* scp linkage (for syscons) */
345 cpumask_t p_vmm_cpumask;
348 #define lwp_wchan lwp_thread->td_wchan
349 #define lwp_wmesg lwp_thread->td_wmesg
350 #define p_session p_pgrp->pg_session
351 #define p_pgid p_pgrp->pg_id
353 /* These flags are kept in p_flags. */
354 #define P_ADVLOCK 0x00001 /* Process may hold a POSIX advisory lock */
355 #define P_CONTROLT 0x00002 /* Has a controlling terminal */
356 #define P_SWAPPEDOUT 0x00004 /* Swapped out of memory */
357 #define P_SYSVSEM 0x00008 /* Might have SysV semaphores */
358 #define P_PPWAIT 0x00010 /* Parent is waiting for child to exec/exit */
359 #define P_PROFIL 0x00020 /* Has started profiling */
360 #define P_POSTEXIT 0x00040 /* Prevent procfs from stepping after this pt */
361 #define P_SCMOUSE 0x00080 /* Process is held by syscons ioctl */
362 /* was: Sleep is interruptible */
363 #define P_SUGID 0x00100 /* Had set id privileges since last exec */
364 #define P_SYSTEM 0x00200 /* System proc: no sigs, stats or swapping */
365 #define P_MAYBETHREADED 0x00400 /* might be threaded optimization */
366 #define P_TRACED 0x00800 /* Debugged process being traced */
367 #define P_WAITED 0x01000 /* SIGSTOP status was returned by wait3/4 */
368 #define P_WEXIT 0x02000 /* Working on exiting (master exit) */
369 #define P_EXEC 0x04000 /* Process called exec */
370 #define P_CONTINUED 0x08000 /* Proc has continued from a stopped state */
372 #define P_UNUSED16 0x00010000
373 #define P_UNUSED17 0x00020000
375 #define P_SWAPWAIT 0x00040000 /* Waiting for a swapin */
376 #define P_UNUSED19 0x00080000 /* was: Now in a zombied state */
378 /* Marked a kernel thread */
379 #define P_UNUSED20 0x00100000 /* was: on a user scheduling run queue */
380 #define P_KTHREADP 0x00200000 /* Process is really a kernel thread */
381 #define P_IDLESWAP 0x00400000 /* Swapout was due to idleswap, not load */
383 #define P_JAILED 0x01000000 /* Process is in jail */
384 #define P_SIGVTALRM 0x02000000 /* signal SIGVTALRM pending due to itimer */
385 #define P_SIGPROF 0x04000000 /* signal SIGPROF pending due to itimer */
386 #define P_INEXEC 0x08000000 /* Process is in execve(). */
387 #define P_UNUSED28 0x10000000
388 #define P_UNUSED29 0x20000000
389 #define P_XCPU 0x40000000 /* SIGXCPU */
391 #define LWP_ALTSTACK 0x0000001 /* have alternate signal stack */
392 #define LWP_OLDMASK 0x0000002 /* need to restore mask before pause */
393 #define LWP_SINTR 0x0000008 /* Sleep is interruptible. */
394 #define LWP_SELECT 0x0000010 /* Selecting; wakeup/waiting danger. */
395 #define LWP_UNUSED20 0x0000020
396 #define LWP_UNUSED40 0x0000040
397 #define LWP_UNUSED80 0x0000080
398 #define LWP_PASSIVE_ACQ 0x0000100 /* Passive acquire cpu (see kern_switch) */
399 #define LWP_PAGING 0x0000200 /* Currently in vm_fault */
402 * LWP_MP_WSTOP: When set the thread will stop prior to return to userland
403 * and has been counted in the process stop-threads-count, but
404 * may still be running in kernel-land.
406 * LWP_MP_WEXIT: When set the thread has been asked to exit and will not return
407 * to userland. p_nthreads will not be decremented until the
408 * thread has actually exited.
410 #define LWP_MP_ONRUNQ 0x0000001 /* on a user scheduling run queue */
411 #define LWP_MP_WEXIT 0x0000002 /* working on exiting (lwpuserret()) */
412 #define LWP_MP_WSTOP 0x0000004 /* working on stopping */
413 #define LWP_MP_ULOAD 0x0000008 /* uload accounting for current cpu */
414 #define LWP_MP_RRFORCE 0x0000010 /* forced resched due to rrcount */
415 #define LWP_MP_VNLRU 0x0000020 /* check excessive vnode allocations (lwpuserret()) */
417 #define LWP_MP_URETMASK (LWP_MP_WEXIT | LWP_MP_VNLRU)
419 #define FIRST_LWP_IN_PROC(p) RB_FIRST(lwp_rb_tree, &(p)->p_lwp_tree)
420 #define FOREACH_LWP_IN_PROC(lp, p) \
421 RB_FOREACH(lp, lwp_rb_tree, &(p)->p_lwp_tree)
422 #define ONLY_LWP_IN_PROC(p) _only_lwp_in_proc(p, __func__)
425 static inline struct lwp *
426 _only_lwp_in_proc(struct proc *p, const char *caller)
428 if (p->p_nthreads != 1) {
429 panic("%s: proc %p (pid %d cmd %s) has more than one thread",
430 caller, p, p->p_pid, p->p_comm);
432 return RB_ROOT(&p->p_lwp_tree);
437 * We use process IDs <= PID_MAX; PID_MAX + 1 must also fit in a pid_t,
438 * as it is used to represent "no process group".
440 #define PID_MAX 99999
441 #define NO_PID 100000
443 #define SESS_LEADER(p) ((p)->p_session->s_leader == (p))
447 #ifdef MALLOC_DECLARE
448 MALLOC_DECLARE(M_SESSION);
449 MALLOC_DECLARE(M_PROC);
450 MALLOC_DECLARE(M_LWP);
451 MALLOC_DECLARE(M_SUBPROC);
452 MALLOC_DECLARE(M_PARGS);
455 /* for priv_check_cred() */
456 #define NULL_CRED_OKAY 0x2
458 /* Handy macro to determine if p1 can mangle p2 */
460 #define PRISON_CHECK(cr1, cr2) \
461 ((!(cr1)->cr_prison) || (cr1)->cr_prison == (cr2)->cr_prison)
466 extern void stopevent(struct proc*, unsigned int, unsigned int);
467 #define STOPEVENT(p,e,v) \
469 if ((p)->p_stops & (e)) { \
475 * Hold process in memory, don't destruct, used by ktrace, procfs, sigio,
476 * and signaling code (e.g. ksignal()).
480 #define PHOLD(p) phold((p))
481 #define PRELE(p) prele((p))
482 #define PHOLDZOMB(p) pholdzomb((p))
483 #define PRELEZOMB(p) prelezomb((p))
484 #define PSTALL(p, msg, n) \
485 do { if ((p)->p_lock > (n)) pstall((p), (msg), (n)); } while (0)
488 * Hold lwp in memory, don't destruct, normally for ptrace/procfs work
489 * atomic ops because they can occur from an IPI.
492 #define LWPHOLD(lp) atomic_add_int(&(lp)->lwp_lock, 1)
493 #define LWPRELE(lp) atomic_add_int(&(lp)->lwp_lock, -1)
495 extern struct proc proc0; /* Process slot for swapper. */
496 extern struct lwp lwp0; /* LWP slot for swapper. */
497 extern struct thread thread0; /* Thread slot for swapper. */
498 extern int hogticks; /* Limit on kernel cpu hogs. */
499 extern int nprocs, maxproc; /* Current and max number of procs. */
500 extern int maxprocperuid; /* Max procs per uid. */
501 extern int sched_quantum; /* Scheduling quantum in ticks */
503 extern struct proc *initproc; /* Process slot for init */
504 extern struct thread *pagethread, *updatethread;
507 * Scheduler independant variables. The primary scheduler polling frequency,
508 * the maximum ESTCPU value, and the weighting factor for nice values. A
509 * cpu bound program's estcpu will increase to ESTCPUMAX - 1.
511 #define ESTCPUFREQ 50
513 extern u_long ps_arg_cache_limit;
514 extern int ps_argsopen;
515 extern int ps_showallprocs;
517 struct proc *pfind (pid_t); /* Find process by id w/ref */
518 struct proc *pfindn (pid_t); /* Find process by id wo/ref */
519 struct pgrp *pgfind (pid_t); /* Find process group by id w/ref */
520 struct proc *zpfind (pid_t); /* Find zombie process by id w/ref */
521 void pgref (struct pgrp *); /* Ref pgrp preventing disposal */
522 void pgrel (struct pgrp *); /* Deref pgrp & dispose on 1->0 trans */
527 int enterpgrp (struct proc *p, pid_t pgid, int mksess);
528 void proc_add_allproc(struct proc *p);
529 void proc_move_allproc_zombie(struct proc *);
530 void proc_remove_zombie(struct proc *);
531 void allproc_scan(int (*callback)(struct proc *, void *), void *data);
532 void alllwp_scan(int (*callback)(struct lwp *, void *), void *data);
533 void zombproc_scan(int (*callback)(struct proc *, void *), void *data);
534 void fixjobc (struct proc *p, struct pgrp *pgrp, int entering);
535 void updatepcpu(struct lwp *, int, int);
536 int inferior (struct proc *p);
537 int leavepgrp (struct proc *p);
538 void sess_hold(struct session *sp);
539 void sess_rele(struct session *sp);
540 void procinit (void);
541 void procinsertinit(struct proc *p);
542 void sessinsertinit(struct session *sess);
543 void pgrpinsertinit(struct pgrp *pg);
544 void relscurproc(struct proc *curp);
545 int p_trespass (struct ucred *cr1, struct ucred *cr2);
546 void setrunnable (struct lwp *);
547 void proc_stop (struct proc *);
548 void proc_unstop (struct proc *);
549 void sleep_gdinit (struct globaldata *);
550 thread_t cpu_heavy_switch (struct thread *);
551 thread_t cpu_lwkt_switch (struct thread *);
553 void cpu_lwp_exit (void) __dead2;
554 void cpu_thread_exit (void) __dead2;
555 void lwp_exit (int masterexit, void *waddr) __dead2;
556 void lwp_dispose (struct lwp *);
557 int killalllwps (int);
558 void exit1 (int) __dead2;
559 void cpu_fork (struct lwp *, struct lwp *, int);
560 int cpu_prepare_lwp(struct lwp *, struct lwp_params *);
561 void cpu_set_fork_handler (struct lwp *, void (*)(void *, struct trapframe *), void *);
562 void cpu_set_thread_handler(struct thread *td, void (*retfunc)(void), void *func, void *arg);
563 int fork1 (struct lwp *, int, struct proc **);
564 void start_forked_proc (struct lwp *, struct proc *);
565 int trace_req (struct proc *);
566 void cpu_thread_wait (struct thread *);
567 void setsugid (void);
568 void faultin (struct proc *p);
569 void swapin_request (void);
570 void phold (struct proc *);
571 void prele (struct proc *);
572 int pholdzomb (struct proc *);
573 void prelezomb (struct proc *);
574 void pstall (struct proc *, const char *, int);
575 void lwpuserret(struct lwp *);
576 void lwpkthreaddeferred(void);
578 u_int32_t procrunnable (void);
582 #endif /* _KERNEL || _KERNEL_STRUCTURES */
583 #endif /* !_SYS_PROC_H_ */