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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 1.15 2003/06/25 03:56:10 dillon Exp $
46 #include <sys/callout.h> /* For struct callout_handle. */
47 #include <sys/filedesc.h>
48 #include <sys/queue.h>
49 #include <sys/rtprio.h> /* For struct rtprio. */
50 #include <sys/signal.h>
52 #include <sys/time.h> /* For structs itimerval, timeval. */
54 #include <sys/ucred.h>
55 #include <sys/event.h> /* For struct klist */
56 #include <sys/thread.h>
57 #include <machine/proc.h> /* Machine-dependent proc substruct. */
60 * One structure allocated per session.
63 int s_count; /* Ref cnt; pgrps in session. */
64 struct proc *s_leader; /* Session leader. */
65 struct vnode *s_ttyvp; /* Vnode of controlling terminal. */
66 struct tty *s_ttyp; /* Controlling terminal. */
67 pid_t s_sid; /* Session ID */
68 char s_login[roundup(MAXLOGNAME, sizeof(long))]; /* Setlogin() name. */
72 * One structure allocated per process group.
75 LIST_ENTRY(pgrp) pg_hash; /* Hash chain. */
76 LIST_HEAD(, proc) pg_members; /* Pointer to pgrp members. */
77 struct session *pg_session; /* Pointer to session. */
78 struct sigiolst pg_sigiolst; /* List of sigio sources. */
79 pid_t pg_id; /* Pgrp id. */
80 int pg_jobc; /* # procs qualifying pgrp for job control */
84 sigset_t ps_sigignore; /* Signals being ignored. */
85 sigset_t ps_sigcatch; /* Signals being caught by user. */
87 struct sigacts *ps_sigacts;
91 #define PS_NOCLDWAIT 0x0001 /* No zombies if child dies */
92 #define PS_NOCLDSTOP 0x0002 /* No SIGCHLD when children stop. */
95 * pargs, used to hold a copy of the command line, if it had a sane
99 u_int ar_ref; /* Reference count */
100 u_int ar_length; /* Length */
101 u_char ar_args[0]; /* Arguments */
105 * Description of a process.
107 * This structure contains the information needed to manage a thread of
108 * control, known in UN*X as a process; it has references to substructures
109 * containing descriptions of things that the process uses, but may share
110 * with related processes. The process structure and the substructures
111 * are always addressable except for those marked "(PROC ONLY)" below,
112 * which might be addressable only on a processor on which the process
119 TAILQ_ENTRY(proc) p_procq; /* run/sleep queue. */
120 LIST_ENTRY(proc) p_list; /* List of all processes. */
123 struct ucred *p_ucred; /* Process owner's identity. */
124 struct filedesc *p_fd; /* Ptr to open files structure. */
125 struct filedesc_to_leader *p_fdtol; /* Ptr to tracking node */
126 struct pstats *p_stats; /* Accounting/statistics (PROC ONLY). */
127 struct plimit *p_limit; /* Process limits. */
129 struct vm_object *p_upages_obj;/* Upages object */
133 struct procsig *p_procsig;
134 #define p_sigacts p_procsig->ps_sigacts
135 #define p_sigignore p_procsig->ps_sigignore
136 #define p_sigcatch p_procsig->ps_sigcatch
137 #define p_rlimit p_limit->pl_rlimit
139 int p_flag; /* P_* flags. */
140 char p_stat; /* S* process status. */
143 pid_t p_pid; /* Process identifier. */
144 LIST_ENTRY(proc) p_hash; /* Hash chain. */
145 LIST_ENTRY(proc) p_pglist; /* List of processes in pgrp. */
146 struct proc *p_pptr; /* Pointer to parent process. */
147 LIST_ENTRY(proc) p_sibling; /* List of sibling processes. */
148 LIST_HEAD(, proc) p_children; /* Pointer to list of children. */
150 struct callout_handle p_ithandle; /*
151 * Callout handle for scheduling
154 /* The following fields are all zeroed upon creation in fork. */
155 #define p_startzero p_oppid
157 pid_t p_oppid; /* Save parent pid during ptrace. XXX */
158 int p_dupfd; /* Sideways return value from fdopen. XXX */
160 struct vmspace *p_vmspace; /* Address space. */
163 u_int p_estcpu; /* Time averaged value of p_cpticks. */
164 int p_cpticks; /* Ticks of cpu time. */
165 fixpt_t p_pctcpu; /* %cpu for this process during p_swtime */
166 void *p_wchan; /* Sleep address. */
167 const char *p_wmesg; /* Reason for sleep. */
168 u_int p_swtime; /* Time swapped in or out. */
169 u_int p_slptime; /* Time since last blocked. */
171 struct itimerval p_realtimer; /* Alarm timer. */
173 int p_traceflag; /* Kernel trace points. */
174 struct vnode *p_tracep; /* Trace to vnode. */
176 sigset_t p_siglist; /* Signals arrived but not delivered. */
178 struct vnode *p_textvp; /* Vnode of executable. */
180 char p_lock; /* Process lock (prevent swap) count. */
181 u_char p_oncpu; /* Which cpu we are on */
182 u_char p_lastcpu; /* Last cpu we were on */
183 char p_rqindex; /* Run queue index */
185 short p_locks; /* DEBUG: lockmgr count of held locks */
186 short p_simple_locks; /* DEBUG: count of held simple locks */
187 unsigned int p_stops; /* procfs event bitmask */
188 unsigned int p_stype; /* procfs stop event type */
189 char p_step; /* procfs stop *once* flag */
190 unsigned char p_pfsflags; /* procfs flags */
191 char p_pad3[2]; /* padding for alignment */
192 register_t p_retval[2]; /* syscall aux returns */
193 struct sigiolst p_sigiolst; /* list of sigio sources */
194 int p_sigparent; /* signal to parent on exit */
195 sigset_t p_oldsigmask; /* saved mask from before sigpause */
196 int p_sig; /* for core dump/debugger XXX */
197 u_long p_code; /* for core dump/debugger XXX */
198 struct klist p_klist; /* knotes attached to this process */
200 /* End area that is zeroed on creation. */
201 #define p_endzero p_startcopy
203 /* The following fields are all copied upon creation in fork. */
204 #define p_startcopy p_sigmask
206 sigset_t p_sigmask; /* Current signal mask. */
207 stack_t p_sigstk; /* sp & on stack state variable */
208 u_char p_priority; /* Process priority. */
209 u_char p_usrpri; /* User-priority based on p_cpu and p_nice. */
210 char p_nice; /* Process "nice" value. */
211 char p_comm[MAXCOMLEN+1];
213 struct pgrp *p_pgrp; /* Pointer to process group. */
215 struct sysentvec *p_sysent; /* System call dispatch information. */
217 struct rtprio p_rtprio; /* Realtime priority. */
218 struct pargs *p_args;
219 /* End area that is copied on creation. */
220 #define p_endcopy p_addr
221 struct user *p_addr; /* Kernel virtual addr of u-area (PROC ONLY). */
222 struct mdproc p_md; /* Any machine-dependent fields. */
224 u_short p_xstat; /* Exit status for wait; also stop signal. */
225 u_short p_acflag; /* Accounting flags. */
226 struct rusage *p_ru; /* Exit information. XXX */
228 int p_nthreads; /* number of threads (only in leader) */
229 void *p_aioinfo; /* ASYNC I/O info */
230 int p_wakeup; /* thread id */
231 struct proc *p_peers;
232 struct proc *p_leader;
233 void *p_emuldata; /* process-specific emulator state data */
234 struct thread *p_thread; /* temporarily embed thread struct in proc */
237 #define p_session p_pgrp->pg_session
238 #define p_pgid p_pgrp->pg_id
241 #define SIDL 1 /* Process being created by fork. */
242 #define SRUN 2 /* Currently runnable. */
243 #define SSLEEP 3 /* Sleeping on an address. */
244 #define SSTOP 4 /* Process debugging or suspension. */
245 #define SZOMB 5 /* Awaiting collection by parent. */
247 /* These flags are kept in p_flags. */
248 #define P_ADVLOCK 0x00001 /* Process may hold a POSIX advisory lock. */
249 #define P_CONTROLT 0x00002 /* Has a controlling terminal. */
250 #define P_INMEM 0x00004 /* Loaded into memory. */
251 #define P_PPWAIT 0x00010 /* Parent is waiting for child to exec/exit. */
252 #define P_PROFIL 0x00020 /* Has started profiling. */
253 #define P_SELECT 0x00040 /* Selecting; wakeup/waiting danger. */
254 #define P_SINTR 0x00080 /* Sleep is interruptible. */
255 #define P_SUGID 0x00100 /* Had set id privileges since last exec. */
256 #define P_SYSTEM 0x00200 /* System proc: no sigs, stats or swapping. */
257 #define P_TIMEOUT 0x00400 /* Timing out during sleep. */
258 #define P_TRACED 0x00800 /* Debugged process being traced. */
259 #define P_WAITED 0x01000 /* Debugging process has waited for child. */
260 #define P_WEXIT 0x02000 /* Working on exiting. */
261 #define P_EXEC 0x04000 /* Process called exec. */
263 /* Should probably be changed into a hold count. */
264 /* was P_NOSWAP 0x08000 was: Do not swap upages; p->p_hold */
265 /* was P_PHYSIO 0x10000 was: Doing physical I/O; use p->p_hold */
267 /* Should be moved to machine-dependent areas. */
268 #define P_OWEUPC 0x20000 /* Owe process an addupc() call at next ast. */
270 #define P_SWAPPING 0x40000 /* Process is being swapped. */
271 #define P_SWAPINREQ 0x80000 /* Swapin request due to wakeup */
273 /* Marked a kernel thread */
274 #define P_UNUSED100000 0x100000
275 #define P_KTHREADP 0x200000 /* Process is really a kernel thread */
276 #define P_XSLEEP 0x400000 /* process sitting on xwait_t structure */
278 #define P_DEADLKTREAT 0x800000 /* lock aquisition - deadlock treatment */
280 #define P_JAILED 0x1000000 /* Process is in jail */
281 #define P_OLDMASK 0x2000000 /* need to restore mask before pause */
282 #define P_ALTSTACK 0x4000000 /* have alternate signal stack */
283 #define P_INEXEC 0x8000000 /* Process is in execve(). */
284 #define P_EXITINTERLOCK 0x10000000 /* Reaping process exit interlock */
288 #ifdef MALLOC_DECLARE
289 MALLOC_DECLARE(M_SESSION);
290 MALLOC_DECLARE(M_SUBPROC);
291 MALLOC_DECLARE(M_ZOMBIE);
292 MALLOC_DECLARE(M_PARGS);
295 /* flags for suser_xxx() */
296 #define PRISON_ROOT 1
298 /* Handy macro to determine of p1 can mangle p2 */
300 #define PRISON_CHECK(cr1, cr2) \
301 ((!(cr1)->cr_prison) || (cr1)->cr_prison == (cr2)->cr_prison)
304 * We use process IDs <= PID_MAX; PID_MAX + 1 must also fit in a pid_t,
305 * as it is used to represent "no process group".
307 #define PID_MAX 99999
308 #define NO_PID 100000
310 #define SESS_LEADER(p) ((p)->p_session->s_leader == (p))
311 #define SESSHOLD(s) ((s)->s_count++)
312 #define SESSRELE(s) { \
313 if (--(s)->s_count == 0) \
314 FREE(s, M_SESSION); \
318 * STOPEVENT is MP SAFE.
320 extern void stopevent(struct proc*, unsigned int, unsigned int);
321 #define STOPEVENT(p,e,v) \
323 if ((p)->p_stops & (e)) { \
330 /* hold process U-area in memory, normally for ptrace/procfs work */
332 if ((p)->p_lock++ == 0 && ((p)->p_flag & P_INMEM) == 0) \
335 #define PRELE(p) (--(p)->p_lock)
337 #define PIDHASH(pid) (&pidhashtbl[(pid) & pidhash])
338 extern LIST_HEAD(pidhashhead, proc) *pidhashtbl;
339 extern u_long pidhash;
341 #define PGRPHASH(pgid) (&pgrphashtbl[(pgid) & pgrphash])
342 extern LIST_HEAD(pgrphashhead, pgrp) *pgrphashtbl;
343 extern u_long pgrphash;
347 #define SET_CURPROC(p) (curproc = (p))
351 extern struct proc proc0; /* Process slot for swapper. */
352 extern struct thread thread0; /* Thread slot for swapper. */
353 extern int hogticks; /* Limit on kernel cpu hogs. */
354 extern int nprocs, maxproc; /* Current and max number of procs. */
355 extern int maxprocperuid; /* Max procs per uid. */
356 extern int sched_quantum; /* Scheduling quantum in ticks */
358 LIST_HEAD(proclist, proc);
359 extern struct proclist allproc; /* List of all processes. */
360 extern struct proclist zombproc; /* List of zombie processes. */
361 extern struct proc *initproc; /* Process slot for init */
362 extern struct thread *pagethread, *updatethread;
364 #define NQS 32 /* 32 run queues. */
365 TAILQ_HEAD(rq, proc);
366 extern struct rq queues[];
367 extern struct rq rtqueues[];
368 extern struct rq idqueues[];
369 extern int whichqs; /* Bit mask summary of non-empty Q's. */
370 extern int whichrtqs; /* Bit mask summary of non-empty Q's. */
371 extern int whichidqs; /* Bit mask summary of non-empty Q's. */
374 * XXX macros for scheduler. Shouldn't be here, but currently needed for
375 * bounding the dubious p_estcpu inheritance in wait1().
376 * INVERSE_ESTCPU_WEIGHT is only suitable for statclock() frequencies in
377 * the range 100-256 Hz (approximately).
379 #define ESTCPULIM(e) \
380 min((e), INVERSE_ESTCPU_WEIGHT * (NICE_WEIGHT * PRIO_MAX - PPQ) + \
381 INVERSE_ESTCPU_WEIGHT - 1)
382 #define INVERSE_ESTCPU_WEIGHT 8 /* 1 / (priorities per estcpu level) */
383 #define NICE_WEIGHT 2 /* priorities per nice level */
384 #define PPQ (128 / NQS) /* priorities per queue */
386 extern u_long ps_arg_cache_limit;
387 extern int ps_argsopen;
389 struct proc *pfind __P((pid_t)); /* Find process by id. */
390 struct pgrp *pgfind __P((pid_t)); /* Find process group by id. */
391 struct proc *zpfind __P((pid_t)); /* Find zombie process by id. */
394 extern struct vm_zone *proc_zone;
396 int enterpgrp __P((struct proc *p, pid_t pgid, int mksess));
397 void fixjobc __P((struct proc *p, struct pgrp *pgrp, int entering));
398 int inferior __P((struct proc *p));
399 int leavepgrp __P((struct proc *p));
400 void mi_switch __P((void));
401 void procinit __P((void));
402 int p_trespass __P((struct ucred *cr1, struct ucred *cr2));
403 void resetpriority __P((struct proc *));
404 int roundrobin_interval __P((void));
405 void schedclock __P((struct proc *));
406 void setrunnable __P((struct proc *));
407 void setrunqueue __P((struct proc *));
408 void sleepinit __P((void));
409 int suser __P((struct thread *td));
410 int suser_proc __P((struct proc *p));
411 int suser_cred __P((struct ucred *cred, int flag));
412 void remrunqueue __P((struct proc *));
413 void cpu_heavy_switch __P((struct thread *));
414 void cpu_lwkt_switch __P((struct thread *));
415 void unsleep __P((struct proc *));
417 void cpu_exit __P((struct proc *)) __dead2;
418 void exit1 __P((int)) __dead2;
419 void cpu_fork __P((struct proc *, struct proc *, int));
420 void cpu_set_fork_handler __P((struct proc *, void (*)(void *), void *));
421 int fork1 __P((struct proc *, int, struct proc **));
422 void start_forked_proc __P((struct proc *, struct proc *));
423 int trace_req __P((struct proc *));
424 void cpu_wait __P((struct proc *));
425 int cpu_coredump __P((struct thread *, struct vnode *, struct ucred *));
426 void setsugid __P((void));
427 void faultin __P((struct proc *p));
429 struct proc * chooseproc __P((void));
430 u_int32_t procrunnable __P((void));
434 #endif /* !_SYS_PROC_H_ */