1 /*- 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. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 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 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 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 1.41 2004/01/04 22:14:39 dillon Exp $ 41 */ 42 43 #ifndef _SYS_PROC_H_ 44 #define _SYS_PROC_H_ 45 46 #if !defined(_KERNEL) && !defined(_KERNEL_STRUCTURES) 47 #error "Userland must include sys/user.h instead of sys/proc.h" 48 #endif 49 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> 55 #ifndef _KERNEL 56 #include <sys/time.h> /* For structs itimerval, timeval. */ 57 #endif 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> 63 #ifdef _KERNEL 64 #include <sys/globaldata.h> 65 #endif 66 #include <machine/proc.h> /* Machine-dependent proc substruct. */ 67 68 /* 69 * One structure allocated per session. 70 */ 71 struct session { 72 int s_count; /* Ref cnt; pgrps in session. */ 73 struct proc *s_leader; /* Session leader. */ 74 struct vnode *s_ttyvp; /* Vnode of controlling terminal. */ 75 struct tty *s_ttyp; /* Controlling terminal. */ 76 pid_t s_sid; /* Session ID */ 77 char s_login[roundup(MAXLOGNAME, sizeof(long))]; /* Setlogin() name. */ 78 }; 79 80 /* 81 * One structure allocated per process group. 82 */ 83 struct pgrp { 84 LIST_ENTRY(pgrp) pg_hash; /* Hash chain. */ 85 LIST_HEAD(, proc) pg_members; /* Pointer to pgrp members. */ 86 struct session *pg_session; /* Pointer to session. */ 87 struct sigiolst pg_sigiolst; /* List of sigio sources. */ 88 pid_t pg_id; /* Pgrp id. */ 89 int pg_jobc; /* # procs qualifying pgrp for job control */ 90 }; 91 92 struct procsig { 93 sigset_t ps_sigignore; /* Signals being ignored. */ 94 sigset_t ps_sigcatch; /* Signals being caught by user. */ 95 int ps_flag; 96 struct sigacts *ps_sigacts; 97 int ps_refcnt; 98 }; 99 100 #define PS_NOCLDWAIT 0x0001 /* No zombies if child dies */ 101 #define PS_NOCLDSTOP 0x0002 /* No SIGCHLD when children stop. */ 102 103 /* 104 * pargs, used to hold a copy of the command line, if it had a sane 105 * length 106 */ 107 struct pargs { 108 u_int ar_ref; /* Reference count */ 109 u_int ar_length; /* Length */ 110 u_char ar_args[0]; /* Arguments */ 111 }; 112 113 /* 114 * Description of a process. 115 * 116 * This structure contains the information needed to manage a thread of 117 * control, known in UN*X as a process; it has references to substructures 118 * containing descriptions of things that the process uses, but may share 119 * with related processes. The process structure and the substructures 120 * are always addressable except for those marked "(PROC ONLY)" below, 121 * which might be addressable only on a processor on which the process 122 * is running. 123 */ 124 125 struct jail; 126 struct sched; 127 128 struct proc { 129 TAILQ_ENTRY(proc) p_procq; /* run/sleep queue. */ 130 LIST_ENTRY(proc) p_list; /* List of all processes. */ 131 132 /* substructures: */ 133 struct ucred *p_ucred; /* Process owner's identity. */ 134 struct filedesc *p_fd; /* Ptr to open files structure. */ 135 struct filedesc_to_leader *p_fdtol; /* Ptr to tracking node */ 136 struct pstats *p_stats; /* Accounting/statistics (PROC ONLY). */ 137 struct plimit *p_limit; /* Process limits. */ 138 #if 0 139 struct vm_object *p_upages_obj;/* Upages object */ 140 #else 141 void *p_dummy1; 142 #endif 143 struct procsig *p_procsig; 144 #define p_sigacts p_procsig->ps_sigacts 145 #define p_sigignore p_procsig->ps_sigignore 146 #define p_sigcatch p_procsig->ps_sigcatch 147 #define p_rlimit p_limit->pl_rlimit 148 149 int p_flag; /* P_* flags. */ 150 char p_stat; /* S* process status. */ 151 char p_pad1[3]; 152 153 pid_t p_pid; /* Process identifier. */ 154 LIST_ENTRY(proc) p_hash; /* Hash chain. */ 155 LIST_ENTRY(proc) p_pglist; /* List of processes in pgrp. */ 156 struct proc *p_pptr; /* Pointer to parent process. */ 157 LIST_ENTRY(proc) p_sibling; /* List of sibling processes. */ 158 LIST_HEAD(, proc) p_children; /* Pointer to list of children. */ 159 struct callout_handle p_ithandle; /* for scheduling p_realtimer */ 160 struct varsymset p_varsymset; 161 162 /* The following fields are all zeroed upon creation in fork. */ 163 #define p_startzero p_oppid 164 165 pid_t p_oppid; /* Save parent pid during ptrace. XXX */ 166 int p_dupfd; /* Sideways return value from fdopen. XXX */ 167 168 struct vmspace *p_vmspace; /* Address space. */ 169 170 /* scheduling */ 171 u_int p_estcpu; /* Time averaged value of p_cpticks. */ 172 int p_cpticks; /* Ticks of cpu time. */ 173 fixpt_t p_pctcpu; /* %cpu for this process during p_swtime */ 174 u_int p_swtime; /* Time swapped in or out. */ 175 u_int p_slptime; /* Time since last blocked. */ 176 177 struct itimerval p_realtimer; /* Alarm timer. */ 178 179 int p_traceflag; /* Kernel trace points. */ 180 struct vnode *p_tracep; /* Trace to vnode. */ 181 182 sigset_t p_siglist; /* Signals arrived but not delivered. */ 183 184 struct vnode *p_textvp; /* Vnode of executable. */ 185 186 char p_lock; /* Process lock (prevent swap) count. */ 187 short p_priority; /* overall process priority */ 188 char p_rqindex; /* Run queue index */ 189 190 unsigned int p_stops; /* procfs event bitmask */ 191 unsigned int p_stype; /* procfs stop event type */ 192 char p_step; /* procfs stop *once* flag */ 193 unsigned char p_pfsflags; /* procfs flags */ 194 char p_pad3[2]; /* padding for alignment */ 195 struct sigiolst p_sigiolst; /* list of sigio sources */ 196 int p_sigparent; /* signal to parent on exit */ 197 sigset_t p_oldsigmask; /* saved mask from before sigpause */ 198 int p_sig; /* for core dump/debugger XXX */ 199 u_long p_code; /* for core dump/debugger XXX */ 200 struct klist p_klist; /* knotes attached to this process */ 201 202 /* End area that is zeroed on creation. */ 203 #define p_endzero p_startcopy 204 205 /* The following fields are all copied upon creation in fork. */ 206 #define p_startcopy p_sigmask 207 208 sigset_t p_sigmask; /* Current signal mask. */ 209 stack_t p_sigstk; /* sp & on stack state variable */ 210 u_char p_unused00; /* (used to be p_priority) */ 211 char p_nice; /* Process "nice" value. */ 212 213 struct pgrp *p_pgrp; /* Pointer to process group. */ 214 215 struct sysentvec *p_sysent; /* System call dispatch information. */ 216 217 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. */ 223 224 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 */ 227 228 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 */ 235 struct upcall *p_upcall; /* USERLAND POINTER! registered upcall */ 236 struct sched *p_sched; /* work-in-progress / Peter Kadau */ 237 }; 238 239 #if defined(_KERNEL) 240 #define p_wchan p_thread->td_wchan 241 #define p_wmesg p_thread->td_wmesg 242 #define p_comm p_thread->td_comm 243 #define p_session p_pgrp->pg_session 244 #define p_pgid p_pgrp->pg_id 245 #endif 246 247 /* Status values. */ 248 #define SIDL 1 /* Process being created by fork. */ 249 #define SRUN 2 /* Currently runnable. */ 250 #define SSLEEP 3 /* Sleeping on an address. */ 251 #define SSTOP 4 /* Process debugging or suspension. */ 252 #define SZOMB 5 /* Awaiting collection by parent. */ 253 #define STHREAD 6 /* Synthesized for eproc only */ 254 255 /* These flags are kept in p_flags. */ 256 #define P_ADVLOCK 0x00001 /* Process may hold a POSIX advisory lock. */ 257 #define P_CONTROLT 0x00002 /* Has a controlling terminal. */ 258 #define P_INMEM 0x00004 /* Loaded into memory. */ 259 #define P_PPWAIT 0x00010 /* Parent is waiting for child to exec/exit. */ 260 #define P_PROFIL 0x00020 /* Has started profiling. */ 261 #define P_SELECT 0x00040 /* Selecting; wakeup/waiting danger. */ 262 #define P_SINTR 0x00080 /* Sleep is interruptible. */ 263 #define P_SUGID 0x00100 /* Had set id privileges since last exec. */ 264 #define P_SYSTEM 0x00200 /* System proc: no sigs, stats or swapping. */ 265 #define P_CURPROC 0x00400 /* 'Current process' on this cpu */ 266 #define P_TRACED 0x00800 /* Debugged process being traced. */ 267 #define P_WAITED 0x01000 /* Debugging process has waited for child. */ 268 #define P_WEXIT 0x02000 /* Working on exiting. */ 269 #define P_EXEC 0x04000 /* Process called exec. */ 270 271 /* Should probably be changed into a hold count. */ 272 /* was P_NOSWAP 0x08000 was: Do not swap upages; p->p_hold */ 273 /* was P_PHYSIO 0x10000 was: Doing physical I/O; use p->p_hold */ 274 275 #define P_UPCALLPEND 0x20000 /* an upcall is pending */ 276 277 #define P_SWAPPING 0x40000 /* Process is being swapped. */ 278 #define P_SWAPINREQ 0x80000 /* Swapin request due to wakeup */ 279 280 /* Marked a kernel thread */ 281 #define P_ONRUNQ 0x100000 /* on a user scheduling run queue */ 282 #define P_KTHREADP 0x200000 /* Process is really a kernel thread */ 283 #define P_CP_RELEASED 0x400000 /* directly schedule LWKT, ignore user schd */ 284 285 #define P_DEADLKTREAT 0x800000 /* lock aquisition - deadlock treatment */ 286 287 #define P_JAILED 0x1000000 /* Process is in jail */ 288 #define P_OLDMASK 0x2000000 /* need to restore mask before pause */ 289 #define P_ALTSTACK 0x4000000 /* have alternate signal stack */ 290 #define P_INEXEC 0x8000000 /* Process is in execve(). */ 291 #define P_PASSIVE_ACQ 0x10000000 /* Passive acquire cpu (see kern_switch) */ 292 #define P_UPCALLWAIT 0x20000000 /* Wait for upcall or signal */ 293 294 #ifdef _KERNEL 295 296 #ifdef MALLOC_DECLARE 297 MALLOC_DECLARE(M_SESSION); 298 MALLOC_DECLARE(M_SUBPROC); 299 MALLOC_DECLARE(M_ZOMBIE); 300 MALLOC_DECLARE(M_PARGS); 301 #endif 302 303 /* flags for suser_xxx() */ 304 #define PRISON_ROOT 1 305 306 /* Handy macro to determine if p1 can mangle p2 */ 307 308 #define PRISON_CHECK(cr1, cr2) \ 309 ((!(cr1)->cr_prison) || (cr1)->cr_prison == (cr2)->cr_prison) 310 311 /* 312 * Handy macro for LISTs. 313 */ 314 #define FOREACH_PROC_IN_SYSTEM(p) LIST_FOREACH((p), &allproc, p_list) 315 316 /* 317 * We use process IDs <= PID_MAX; PID_MAX + 1 must also fit in a pid_t, 318 * as it is used to represent "no process group". 319 */ 320 #define PID_MAX 99999 321 #define NO_PID 100000 322 323 #define SESS_LEADER(p) ((p)->p_session->s_leader == (p)) 324 #define SESSHOLD(s) ((s)->s_count++) 325 #define SESSRELE(s) { \ 326 if (--(s)->s_count == 0) \ 327 FREE(s, M_SESSION); \ 328 } 329 330 /* 331 * STOPEVENT 332 */ 333 extern void stopevent(struct proc*, unsigned int, unsigned int); 334 #define STOPEVENT(p,e,v) \ 335 do { \ 336 if ((p)->p_stops & (e)) { \ 337 stopevent(p,e,v); \ 338 } \ 339 } while (0) 340 341 /* hold process U-area in memory, normally for ptrace/procfs work */ 342 #define PHOLD(p) { \ 343 if ((p)->p_lock++ == 0 && ((p)->p_flag & P_INMEM) == 0) \ 344 faultin(p); \ 345 } 346 #define PRELE(p) (--(p)->p_lock) 347 348 #define PIDHASH(pid) (&pidhashtbl[(pid) & pidhash]) 349 extern LIST_HEAD(pidhashhead, proc) *pidhashtbl; 350 extern u_long pidhash; 351 352 #define PGRPHASH(pgid) (&pgrphashtbl[(pgid) & pgrphash]) 353 extern LIST_HEAD(pgrphashhead, pgrp) *pgrphashtbl; 354 extern u_long pgrphash; 355 356 #if 0 357 #ifndef SET_CURPROC 358 #define SET_CURPROC(p) (curproc = (p)) 359 #endif 360 #endif 361 362 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 */ 368 369 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; 374 375 #define NQS 32 /* 32 run queues. */ 376 TAILQ_HEAD(rq, proc); 377 378 /* 379 * Scheduler estcpu macros. 380 * 381 * p_priority = NICE_ADJUST(p->p_nice - PRIO_MIN) + 382 * p->p_estcpu / ESTCPURAMP; 383 * 384 * NICE_WEIGHT determines the p_estcpu overlap between nice levels. It 385 * cannot exceed 3.0. A value of 2.0 gives us a nice small overlap between 386 * nice -20 and nice +0. A value of 3.0 reduces the overlap while a value 387 * of 1.0 increases the overlap. 388 * 389 * ESTCPURAMP determines how slowly estcpu effects the process priority. 390 * Higher numbers result in slower ramp-up times because estcpu is incremented 391 * once per scheduler tick and maxes out at ESTCPULIM. 392 */ 393 394 #define ESTCPURAMP 8 /* higher equals slower */ 395 #define NICE_ADJUST(value) (((unsigned int)(NICE_WEIGHT * 128) * (value)) / 128) 396 #define ESTCPULIM(v) min((v), (MAXPRI - NICE_ADJUST(PRIO_MAX - PRIO_MIN)) * ESTCPURAMP) 397 #define NICE_WEIGHT 2.0 /* priorities per nice level */ 398 #define PPQ ((MAXPRI + 1) / NQS) /* priorities per queue */ 399 400 extern u_long ps_arg_cache_limit; 401 extern int ps_argsopen; 402 extern int ps_showallprocs; 403 404 struct proc *pfind (pid_t); /* Find process by id. */ 405 struct pgrp *pgfind (pid_t); /* Find process group by id. */ 406 struct proc *zpfind (pid_t); /* Find zombie process by id. */ 407 408 struct vm_zone; 409 struct globaldata; 410 extern struct vm_zone *proc_zone; 411 412 int enterpgrp (struct proc *p, pid_t pgid, int mksess); 413 void fixjobc (struct proc *p, struct pgrp *pgrp, int entering); 414 int inferior (struct proc *p); 415 int leavepgrp (struct proc *p); 416 void mi_switch (void); 417 void procinit (void); 418 void relscurproc(struct proc *curp); 419 int p_trespass (struct ucred *cr1, struct ucred *cr2); 420 void resetpriority (struct proc *); 421 int roundrobin_interval (void); 422 void resched_cpus(u_int32_t mask); 423 void schedclock (void *dummy); 424 void setrunnable (struct proc *); 425 void clrrunnable (struct proc *, int stat); 426 void setrunqueue (struct proc *); 427 void sleepinit (void); 428 int suser (struct thread *td); 429 int suser_proc (struct proc *p); 430 int suser_cred (struct ucred *cred, int flag); 431 void remrunqueue (struct proc *); 432 void release_curproc (struct proc *curp); 433 void acquire_curproc (struct proc *curp); 434 void cpu_heavy_switch (struct thread *); 435 void cpu_lwkt_switch (struct thread *); 436 void unsleep (struct thread *); 437 438 void cpu_proc_exit (void) __dead2; 439 void cpu_thread_exit (void) __dead2; 440 void exit1 (int) __dead2; 441 void cpu_fork (struct proc *, struct proc *, int); 442 void cpu_set_fork_handler (struct proc *, void (*)(void *), void *); 443 void cpu_set_thread_handler(struct thread *td, void (*retfunc)(void), void *func, void *arg); 444 int fork1 (struct proc *, int, struct proc **); 445 void start_forked_proc (struct proc *, struct proc *); 446 int trace_req (struct proc *); 447 void cpu_proc_wait (struct proc *); 448 void cpu_thread_wait (struct thread *); 449 int cpu_coredump (struct thread *, struct vnode *, struct ucred *); 450 void setsugid (void); 451 void faultin (struct proc *p); 452 void sched_thread_init(void); 453 454 u_int32_t procrunnable (void); 455 456 #endif /* _KERNEL */ 457 458 #endif /* !_SYS_PROC_H_ */ 459