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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 1.61 2005/06/27 18:37:59 dillon Exp $
46 #if !defined(_KERNEL) && !defined(_KERNEL_STRUCTURES)
47 #error "Userland must include sys/user.h instead of sys/proc.h"
50 #include <sys/callout.h> /* For struct callout_handle. */
51 #include <sys/filedesc.h>
52 #include <sys/queue.h>
53 #include <sys/rtprio.h> /* For struct rtprio. */
54 #include <sys/signal.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/thread.h>
61 #include <sys/varsym.h>
62 #include <sys/upcall.h>
64 #include <sys/globaldata.h>
66 #include <sys/systimer.h>
67 #include <sys/usched.h>
68 #include <machine/proc.h> /* Machine-dependent proc substruct. */
71 * One structure allocated per session.
74 int s_count; /* Ref cnt; pgrps in session. */
75 struct proc *s_leader; /* Session leader. */
76 struct vnode *s_ttyvp; /* Vnode of controlling terminal. */
77 struct tty *s_ttyp; /* Controlling terminal. */
78 pid_t s_sid; /* Session ID */
79 char s_login[roundup(MAXLOGNAME, sizeof(long))]; /* Setlogin() name. */
83 * One structure allocated per process group.
86 LIST_ENTRY(pgrp) pg_hash; /* Hash chain. */
87 LIST_HEAD(, proc) pg_members; /* Pointer to pgrp members. */
88 struct session *pg_session; /* Pointer to session. */
89 struct sigiolst pg_sigiolst; /* List of sigio sources. */
90 pid_t pg_id; /* Pgrp id. */
91 int pg_jobc; /* # procs qualifying pgrp for job control */
95 sigset_t ps_sigignore; /* Signals being ignored. */
96 sigset_t ps_sigcatch; /* Signals being caught by user. */
98 struct sigacts *ps_sigacts;
102 #define PS_NOCLDWAIT 0x0001 /* No zombies if child dies */
103 #define PS_NOCLDSTOP 0x0002 /* No SIGCHLD when children stop. */
106 * pargs, used to hold a copy of the command line, if it had a sane
110 u_int ar_ref; /* Reference count */
111 u_int ar_length; /* Length */
112 u_char ar_args[0]; /* Arguments */
116 * Description of a process.
118 * This structure contains the information needed to manage a thread of
119 * control, known in UN*X as a process; it has references to substructures
120 * containing descriptions of things that the process uses, but may share
121 * with related processes. The process structure and the substructures
122 * are always addressable except for those marked "(PROC ONLY)" below,
123 * which might be addressable only on a processor on which the process
126 * NOTE! The process start time is stored in the thread structure associated
127 * with the process. If the process is a Zombie, then this field will be
128 * inaccessible due to the thread structure being free'd in kern_wait1().
134 TAILQ_ENTRY(proc) p_procq; /* run/sleep queue. */
135 LIST_ENTRY(proc) p_list; /* List of all processes. */
138 struct ucred *p_ucred; /* Process owner's identity. */
139 struct filedesc *p_fd; /* Ptr to open files structure. */
140 struct filedesc_to_leader *p_fdtol; /* Ptr to tracking node */
141 struct pstats *p_stats; /* Accounting/statistics (PROC ONLY). */
142 struct plimit *p_limit; /* Process limits. */
144 struct procsig *p_procsig;
145 #define p_sigacts p_procsig->ps_sigacts
146 #define p_sigignore p_procsig->ps_sigignore
147 #define p_sigcatch p_procsig->ps_sigcatch
148 #define p_rlimit p_limit->pl_rlimit
150 int p_flag; /* P_* flags. */
151 char p_stat; /* S* process status. */
154 pid_t p_pid; /* Process identifier. */
155 LIST_ENTRY(proc) p_hash; /* Hash chain. */
156 LIST_ENTRY(proc) p_pglist; /* List of processes in pgrp. */
157 struct proc *p_pptr; /* Pointer to parent process. */
158 LIST_ENTRY(proc) p_sibling; /* List of sibling processes. */
159 LIST_HEAD(, proc) p_children; /* Pointer to list of children. */
160 struct callout p_ithandle; /* for scheduling p_realtimer */
161 struct varsymset p_varsymset;
163 /* The following fields are all zeroed upon creation in fork. */
164 #define p_startzero p_oppid
166 pid_t p_oppid; /* Save parent pid during ptrace. XXX */
167 int p_dupfd; /* Sideways return value from fdopen. XXX */
169 struct vmspace *p_vmspace; /* Address space. */
174 sysclock_t p_cpticks; /* cpu used in sched clock ticks */
175 sysclock_t p_cpbase; /* Measurement base */
176 fixpt_t p_pctcpu; /* %cpu for this process */
177 u_int p_swtime; /* Time swapped in or out. */
178 u_int p_slptime; /* Time since last blocked. */
180 struct itimerval p_realtimer; /* Alarm timer. */
182 int p_traceflag; /* Kernel trace points. */
183 struct vnode *p_tracep; /* Trace to vnode. */
185 sigset_t p_siglist; /* Signals arrived but not delivered. */
187 struct vnode *p_textvp; /* Vnode of executable. */
189 union usched_data p_usdata; /* User scheduler specific */
191 unsigned int p_stops; /* procfs event bitmask */
192 unsigned int p_stype; /* procfs stop event type */
193 char p_step; /* procfs stop *once* flag */
194 unsigned char p_pfsflags; /* procfs flags */
195 char p_pad2[2]; /* padding for alignment */
196 struct sigiolst p_sigiolst; /* list of sigio sources */
197 int p_sigparent; /* signal to parent on exit */
198 sigset_t p_oldsigmask; /* saved mask from before sigpause */
199 int p_sig; /* for core dump/debugger XXX */
200 u_long p_code; /* for core dump/debugger XXX */
201 struct klist p_klist; /* knotes attached to this process */
203 /* End area that is zeroed on creation. */
204 #define p_endzero p_startcopy
206 /* The following fields are all copied upon creation in fork. */
207 #define p_startcopy p_sigmask
209 sigset_t p_sigmask; /* Current signal mask. */
210 stack_t p_sigstk; /* sp & on stack state variable */
211 char p_lock; /* Process lock (prevent swap) count. */
212 char p_nice; /* Process "nice" value. */
215 struct pgrp *p_pgrp; /* Pointer to process group. */
217 struct sysentvec *p_sysent; /* System call dispatch information. */
219 struct rtprio p_rtprio; /* Realtime priority. */
220 struct pargs *p_args;
221 /* End area that is copied on creation. */
222 #define p_endcopy p_addr
223 struct user *p_addr; /* Kernel virtual addr of u-area (PROC ONLY) */
224 struct mdproc p_md; /* Any machine-dependent fields. */
226 u_short p_xstat; /* Exit status or last stop signal */
227 u_short p_acflag; /* Accounting flags. */
228 struct rusage *p_ru; /* Exit information. XXX */
230 int p_nthreads; /* number of threads (only in leader) */
231 void *p_aioinfo; /* ASYNC I/O info */
232 int p_wakeup; /* thread id */
233 struct proc *p_peers;
234 struct proc *p_leader;
235 void *p_emuldata; /* process-specific emulator state */
236 struct thread *p_thread; /* backpointer to proc's thread */
237 struct upcall *p_upcall; /* REGISTERED USERLAND POINTER! */
238 struct usched *p_usched; /* Userland scheduling control */
239 int p_numposixlocks; /* number of POSIX locks */
240 TAILQ_HEAD(, sysmsg) p_sysmsgq; /* Recorded asynch system calls */
241 int p_num_sysmsg; /* Number of asynch messages running */
245 #define p_wchan p_thread->td_wchan
246 #define p_wmesg p_thread->td_wmesg
247 #define p_comm p_thread->td_comm
248 #define p_session p_pgrp->pg_session
249 #define p_pgid p_pgrp->pg_id
253 #define SIDL 1 /* Process being created by fork. */
254 #define SRUN 2 /* Currently runnable. */
255 #define SSLEEP 3 /* Sleeping on an address. */
256 #define SSTOP 4 /* Process debugging or suspension. */
257 #define SZOMB 5 /* Awaiting collection by parent. */
258 #define STHREAD 6 /* Synthesized for eproc only */
260 /* These flags are kept in p_flags. */
261 #define P_ADVLOCK 0x00001 /* Process may hold a POSIX advisory lock. */
262 #define P_CONTROLT 0x00002 /* Has a controlling terminal. */
263 #define P_INMEM 0x00004 /* Loaded into memory. */
264 #define P_PPWAIT 0x00010 /* Parent is waiting for child to exec/exit. */
265 #define P_PROFIL 0x00020 /* Has started profiling. */
266 #define P_SELECT 0x00040 /* Selecting; wakeup/waiting danger. */
267 #define P_SINTR 0x00080 /* Sleep is interruptible. */
268 #define P_SUGID 0x00100 /* Had set id privileges since last exec. */
269 #define P_SYSTEM 0x00200 /* System proc: no sigs, stats or swapping. */
270 #define P_UNUSED00400 0x00400
271 #define P_TRACED 0x00800 /* Debugged process being traced. */
272 #define P_WAITED 0x01000 /* Debugging process has waited for child. */
273 #define P_WEXIT 0x02000 /* Working on exiting. */
274 #define P_EXEC 0x04000 /* Process called exec. */
276 /* Should probably be changed into a hold count. */
277 /* was P_NOSWAP 0x08000 was: Do not swap upages; p->p_hold */
278 /* was P_PHYSIO 0x10000 was: Doing physical I/O; use p->p_hold */
280 #define P_UPCALLPEND 0x20000 /* an upcall is pending */
282 #define P_SWAPPING 0x40000 /* Process is being swapped. */
283 #define P_SWAPINREQ 0x80000 /* Swapin request due to wakeup */
285 /* Marked a kernel thread */
286 #define P_ONRUNQ 0x100000 /* on a user scheduling run queue */
287 #define P_KTHREADP 0x200000 /* Process is really a kernel thread */
288 #define P_UNUSED400000 0x400000
289 #define P_DEADLKTREAT 0x800000 /* lock aquisition - deadlock treatment */
291 #define P_JAILED 0x1000000 /* Process is in jail */
292 #define P_OLDMASK 0x2000000 /* need to restore mask before pause */
293 #define P_ALTSTACK 0x4000000 /* have alternate signal stack */
294 #define P_INEXEC 0x8000000 /* Process is in execve(). */
295 #define P_PASSIVE_ACQ 0x10000000 /* Passive acquire cpu (see kern_switch) */
296 #define P_UPCALLWAIT 0x20000000 /* Wait for upcall or signal */
300 #ifdef MALLOC_DECLARE
301 MALLOC_DECLARE(M_SESSION);
302 MALLOC_DECLARE(M_SUBPROC);
303 MALLOC_DECLARE(M_ZOMBIE);
304 MALLOC_DECLARE(M_PARGS);
307 /* flags for suser_xxx() */
308 #define PRISON_ROOT 0x1
309 #define NULL_CRED_OKAY 0x2
311 /* Handy macro to determine if p1 can mangle p2 */
313 #define PRISON_CHECK(cr1, cr2) \
314 ((!(cr1)->cr_prison) || (cr1)->cr_prison == (cr2)->cr_prison)
317 * Handy macro for LISTs.
319 #define FOREACH_PROC_IN_SYSTEM(p) LIST_FOREACH((p), &allproc, p_list)
322 * We use process IDs <= PID_MAX; PID_MAX + 1 must also fit in a pid_t,
323 * as it is used to represent "no process group".
325 #define PID_MAX 99999
326 #define NO_PID 100000
328 #define SESS_LEADER(p) ((p)->p_session->s_leader == (p))
333 extern void stopevent(struct proc*, unsigned int, unsigned int);
334 #define STOPEVENT(p,e,v) \
336 if ((p)->p_stops & (e)) { \
341 /* hold process U-area in memory, normally for ptrace/procfs work */
343 if ((p)->p_lock++ == 0 && ((p)->p_flag & P_INMEM) == 0) \
346 #define PRELE(p) (--(p)->p_lock)
348 #define PIDHASH(pid) (&pidhashtbl[(pid) & pidhash])
349 extern LIST_HEAD(pidhashhead, proc) *pidhashtbl;
350 extern u_long pidhash;
352 #define PGRPHASH(pgid) (&pgrphashtbl[(pgid) & pgrphash])
353 extern LIST_HEAD(pgrphashhead, pgrp) *pgrphashtbl;
354 extern u_long pgrphash;
358 #define SET_CURPROC(p) (curproc = (p))
362 extern struct proc proc0; /* Process slot for swapper. */
363 extern struct thread thread0; /* Thread slot for swapper. */
364 extern int hogticks; /* Limit on kernel cpu hogs. */
365 extern int nprocs, maxproc; /* Current and max number of procs. */
366 extern int maxprocperuid; /* Max procs per uid. */
367 extern int sched_quantum; /* Scheduling quantum in ticks */
369 LIST_HEAD(proclist, proc);
370 extern struct proclist allproc; /* List of all processes. */
371 extern struct proclist zombproc; /* List of zombie processes. */
372 extern struct proc *initproc; /* Process slot for init */
373 extern struct thread *pagethread, *updatethread;
376 * Scheduler independant variables. The primary scheduler polling frequency,
377 * the maximum ESTCPU value, and the weighting factor for nice values. A
378 * cpu bound program's estcpu will increase to ESTCPUMAX - 1.
380 #define ESTCPUFREQ 50
382 extern u_long ps_arg_cache_limit;
383 extern int ps_argsopen;
384 extern int ps_showallprocs;
386 struct proc *pfind (pid_t); /* Find process by id. */
387 struct pgrp *pgfind (pid_t); /* Find process group by id. */
388 struct proc *zpfind (pid_t); /* Find zombie process by id. */
392 extern struct vm_zone *proc_zone;
394 int enterpgrp (struct proc *p, pid_t pgid, int mksess);
395 void fixjobc (struct proc *p, struct pgrp *pgrp, int entering);
396 void updatepcpu(struct proc *, int, int);
397 int inferior (struct proc *p);
398 int leavepgrp (struct proc *p);
399 void sess_hold(struct session *sp);
400 void sess_rele(struct session *sp);
401 void mi_switch (struct proc *p);
402 void procinit (void);
403 void relscurproc(struct proc *curp);
404 int p_trespass (struct ucred *cr1, struct ucred *cr2);
405 void setrunnable (struct proc *);
406 void clrrunnable (struct proc *, int stat);
407 void sleepinit (void);
408 int suser (struct thread *td);
409 int suser_proc (struct proc *p);
410 int suser_cred (struct ucred *cred, int flag);
411 void cpu_heavy_switch (struct thread *);
412 void cpu_lwkt_switch (struct thread *);
413 void unsleep (struct thread *);
415 void cpu_proc_exit (void) __dead2;
416 void cpu_thread_exit (void) __dead2;
417 void exit1 (int) __dead2;
418 void cpu_fork (struct proc *, struct proc *, int);
419 void cpu_set_fork_handler (struct proc *, void (*)(void *), void *);
420 void cpu_set_thread_handler(struct thread *td, void (*retfunc)(void), void *func, void *arg);
421 int fork1 (struct proc *, int, struct proc **);
422 void start_forked_proc (struct proc *, struct proc *);
423 int trace_req (struct proc *);
424 void cpu_proc_wait (struct proc *);
425 void cpu_thread_wait (struct thread *);
426 int cpu_coredump (struct thread *, struct vnode *, struct ucred *);
427 void setsugid (void);
428 void faultin (struct proc *p);
430 u_int32_t procrunnable (void);
434 #endif /* !_SYS_PROC_H_ */