sys/kern/kern_proc.c

   1 /*-
   2  * Copyright (c) 1982, 1986, 1989, 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      @(#)kern_proc.c 8.7 (Berkeley) 2/14/95
  30  */
  31
  32 #include <sys/cdefs.h>
  33 __FBSDID("$FreeBSD$");
  34
  35 #include "opt_compat.h"
  36 #include "opt_ddb.h"
  37 #include "opt_kdtrace.h"
  38 #include "opt_ktrace.h"
  39 #include "opt_kstack_pages.h"
  40 #include "opt_stack.h"
  41
  42 #include <sys/param.h>
  43 #include <sys/systm.h>
  44 #include <sys/kernel.h>
  45 #include <sys/limits.h>
  46 #include <sys/lock.h>
  47 #include <sys/malloc.h>
  48 #include <sys/mount.h>
  49 #include <sys/mutex.h>
  50 #include <sys/proc.h>
  51 #include <sys/refcount.h>
  52 #include <sys/sbuf.h>
  53 #include <sys/sysent.h>
  54 #include <sys/sched.h>
  55 #include <sys/smp.h>
  56 #include <sys/stack.h>
  57 #include <sys/sysctl.h>
  58 #include <sys/filedesc.h>
  59 #include <sys/tty.h>
  60 #include <sys/signalvar.h>
  61 #include <sys/sdt.h>
  62 #include <sys/sx.h>
  63 #include <sys/user.h>
  64 #include <sys/jail.h>
  65 #include <sys/vnode.h>
  66 #include <sys/eventhandler.h>
  67
  68 #ifdef DDB
  69 #include <ddb/ddb.h>
  70 #endif
  71
  72 #include <vm/vm.h>
  73 #include <vm/vm_extern.h>
  74 #include <vm/pmap.h>
  75 #include <vm/vm_map.h>
  76 #include <vm/vm_object.h>
  77 #include <vm/uma.h>
  78
  79 #ifdef COMPAT_FREEBSD32
  80 #include <compat/freebsd32/freebsd32.h>
  81 #include <compat/freebsd32/freebsd32_util.h>
  82 #endif
  83
  84 SDT_PROVIDER_DEFINE(proc);
  85 SDT_PROBE_DEFINE(proc, kernel, ctor, entry, entry);
  86 SDT_PROBE_ARGTYPE(proc, kernel, ctor, entry, 0, "struct proc *");
  87 SDT_PROBE_ARGTYPE(proc, kernel, ctor, entry, 1, "int");
  88 SDT_PROBE_ARGTYPE(proc, kernel, ctor, entry, 2, "void *");
  89 SDT_PROBE_ARGTYPE(proc, kernel, ctor, entry, 3, "int");
  90 SDT_PROBE_DEFINE(proc, kernel, ctor, return, return);
  91 SDT_PROBE_ARGTYPE(proc, kernel, ctor, return, 0, "struct proc *");
  92 SDT_PROBE_ARGTYPE(proc, kernel, ctor, return, 1, "int");
  93 SDT_PROBE_ARGTYPE(proc, kernel, ctor, return, 2, "void *");
  94 SDT_PROBE_ARGTYPE(proc, kernel, ctor, return, 3, "int");
  95 SDT_PROBE_DEFINE(proc, kernel, dtor, entry, entry);
  96 SDT_PROBE_ARGTYPE(proc, kernel, dtor, entry, 0, "struct proc *");
  97 SDT_PROBE_ARGTYPE(proc, kernel, dtor, entry, 1, "int");
  98 SDT_PROBE_ARGTYPE(proc, kernel, dtor, entry, 2, "void *");
  99 SDT_PROBE_ARGTYPE(proc, kernel, dtor, entry, 3, "struct thread *");
 100 SDT_PROBE_DEFINE(proc, kernel, dtor, return, return);
 101 SDT_PROBE_ARGTYPE(proc, kernel, dtor, return, 0, "struct proc *");
 102 SDT_PROBE_ARGTYPE(proc, kernel, dtor, return, 1, "int");
 103 SDT_PROBE_ARGTYPE(proc, kernel, dtor, return, 2, "void *");
 104 SDT_PROBE_DEFINE(proc, kernel, init, entry, entry);
 105 SDT_PROBE_ARGTYPE(proc, kernel, init, entry, 0, "struct proc *");
 106 SDT_PROBE_ARGTYPE(proc, kernel, init, entry, 1, "int");
 107 SDT_PROBE_ARGTYPE(proc, kernel, init, entry, 2, "int");
 108 SDT_PROBE_DEFINE(proc, kernel, init, return, return);
 109 SDT_PROBE_ARGTYPE(proc, kernel, init, return, 0, "struct proc *");
 110 SDT_PROBE_ARGTYPE(proc, kernel, init, return, 1, "int");
 111 SDT_PROBE_ARGTYPE(proc, kernel, init, return, 2, "int");
 112
 113 MALLOC_DEFINE(M_PGRP, "pgrp", "process group header");
 114 MALLOC_DEFINE(M_SESSION, "session", "session header");
 115 static MALLOC_DEFINE(M_PROC, "proc", "Proc structures");
 116 MALLOC_DEFINE(M_SUBPROC, "subproc", "Proc sub-structures");
 117
 118 static void doenterpgrp(struct proc *, struct pgrp *);
 119 static void orphanpg(struct pgrp *pg);
 120 static void fill_kinfo_aggregate(struct proc *p, struct kinfo_proc *kp);
 121 static void fill_kinfo_proc_only(struct proc *p, struct kinfo_proc *kp);
 122 static void fill_kinfo_thread(struct thread *td, struct kinfo_proc *kp,
 123     int preferthread);
 124 static void pgadjustjobc(struct pgrp *pgrp, int entering);
 125 static void pgdelete(struct pgrp *);
 126 static int proc_ctor(void *mem, int size, void *arg, int flags);
 127 static void proc_dtor(void *mem, int size, void *arg);
 128 static int proc_init(void *mem, int size, int flags);
 129 static void proc_fini(void *mem, int size);
 130 static void pargs_free(struct pargs *pa);
 131
 132 /*
 133  * Other process lists
 134  */
 135 struct pidhashhead *pidhashtbl;
 136 u_long pidhash;
 137 struct pgrphashhead *pgrphashtbl;
 138 u_long pgrphash;
 139 struct proclist allproc;
 140 struct proclist zombproc;
 141 struct sx allproc_lock;
 142 struct sx proctree_lock;
 143 struct mtx ppeers_lock;
 144 uma_zone_t proc_zone;
 145
 146 int kstack_pages = KSTACK_PAGES;
 147 SYSCTL_INT(_kern, OID_AUTO, kstack_pages, CTLFLAG_RD, &kstack_pages, 0,
 148     "Kernel stack size in pages");
 149
 150 CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE);
 151 #ifdef COMPAT_FREEBSD32
 152 CTASSERT(sizeof(struct kinfo_proc32) == KINFO_PROC32_SIZE);
 153 #endif
 154
 155 /*
 156  * Initialize global process hashing structures.
 157  */
 158 void
 159 procinit()
 160 {
 161
 162         sx_init(&allproc_lock, "allproc");
 163         sx_init(&proctree_lock, "proctree");
 164         mtx_init(&ppeers_lock, "p_peers", NULL, MTX_DEF);
 165         LIST_INIT(&allproc);
 166         LIST_INIT(&zombproc);
 167         pidhashtbl = hashinit(maxproc / 4, M_PROC, &pidhash);
 168         pgrphashtbl = hashinit(maxproc / 4, M_PROC, &pgrphash);
 169         proc_zone = uma_zcreate("PROC", sched_sizeof_proc(),
 170             proc_ctor, proc_dtor, proc_init, proc_fini,
 171             UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
 172         uihashinit();
 173 }
 174
 175 /*
 176  * Prepare a proc for use.
 177  */
 178 static int
 179 proc_ctor(void *mem, int size, void *arg, int flags)
 180 {
 181         struct proc *p;
 182
 183         p = (struct proc *)mem;
 184         SDT_PROBE(proc, kernel, ctor , entry, p, size, arg, flags, 0);
 185         EVENTHANDLER_INVOKE(process_ctor, p);
 186         SDT_PROBE(proc, kernel, ctor , return, p, size, arg, flags, 0);
 187         return (0);
 188 }
 189
 190 /*
 191  * Reclaim a proc after use.
 192  */
 193 static void
 194 proc_dtor(void *mem, int size, void *arg)
 195 {
 196         struct proc *p;
 197         struct thread *td;
 198
 199         /* INVARIANTS checks go here */
 200         p = (struct proc *)mem;
 201         td = FIRST_THREAD_IN_PROC(p);
 202         SDT_PROBE(proc, kernel, dtor, entry, p, size, arg, td, 0);
 203         if (td != NULL) {
 204 #ifdef INVARIANTS
 205                 KASSERT((p->p_numthreads == 1),
 206                     ("bad number of threads in exiting process"));
 207                 KASSERT(STAILQ_EMPTY(&p->p_ktr), ("proc_dtor: non-empty p_ktr"));
 208 #endif
 209                 /* Free all OSD associated to this thread. */
 210                 osd_thread_exit(td);
 211         }
 212         EVENTHANDLER_INVOKE(process_dtor, p);
 213         if (p->p_ksi != NULL)
 214                 KASSERT(! KSI_ONQ(p->p_ksi), ("SIGCHLD queue"));
 215         SDT_PROBE(proc, kernel, dtor, return, p, size, arg, 0, 0);
 216 }
 217
 218 /*
 219  * Initialize type-stable parts of a proc (when newly created).
 220  */
 221 static int
 222 proc_init(void *mem, int size, int flags)
 223 {
 224         struct proc *p;
 225
 226         p = (struct proc *)mem;
 227         SDT_PROBE(proc, kernel, init, entry, p, size, flags, 0, 0);
 228         p->p_sched = (struct p_sched *)&p[1];
 229         bzero(&p->p_mtx, sizeof(struct mtx));
 230         mtx_init(&p->p_mtx, "process lock", NULL, MTX_DEF | MTX_DUPOK);
 231         mtx_init(&p->p_slock, "process slock", NULL, MTX_SPIN | MTX_RECURSE);
 232         cv_init(&p->p_pwait, "ppwait");
 233         cv_init(&p->p_dbgwait, "dbgwait");
 234         TAILQ_INIT(&p->p_threads);           /* all threads in proc */
 235         EVENTHANDLER_INVOKE(process_init, p);
 236         p->p_stats = pstats_alloc();
 237         SDT_PROBE(proc, kernel, init, return, p, size, flags, 0, 0);
 238         return (0);
 239 }
 240
 241 /*
 242  * UMA should ensure that this function is never called.
 243  * Freeing a proc structure would violate type stability.
 244  */
 245 static void
 246 proc_fini(void *mem, int size)
 247 {
 248 #ifdef notnow
 249         struct proc *p;
 250
 251         p = (struct proc *)mem;
 252         EVENTHANDLER_INVOKE(process_fini, p);
 253         pstats_free(p->p_stats);
 254         thread_free(FIRST_THREAD_IN_PROC(p));
 255         mtx_destroy(&p->p_mtx);
 256         if (p->p_ksi != NULL)
 257                 ksiginfo_free(p->p_ksi);
 258 #else
 259         panic("proc reclaimed");
 260 #endif
 261 }
 262
 263 /*
 264  * Is p an inferior of the current process?
 265  */
 266 int
 267 inferior(p)
 268         register struct proc *p;
 269 {
 270
 271         sx_assert(&proctree_lock, SX_LOCKED);
 272         for (; p != curproc; p = p->p_pptr)
 273                 if (p->p_pid == 0)
 274                         return (0);
 275         return (1);
 276 }
 277
 278 /*
 279  * Locate a process by number; return only "live" processes -- i.e., neither
 280  * zombies nor newly born but incompletely initialized processes.  By not
 281  * returning processes in the PRS_NEW state, we allow callers to avoid
 282  * testing for that condition to avoid dereferencing p_ucred, et al.
 283  */
 284 struct proc *
 285 pfind(pid)
 286         register pid_t pid;
 287 {
 288         register struct proc *p;
 289
 290         sx_slock(&allproc_lock);
 291         LIST_FOREACH(p, PIDHASH(pid), p_hash)
 292                 if (p->p_pid == pid) {
 293                         if (p->p_state == PRS_NEW) {
 294                                 p = NULL;
 295                                 break;
 296                         }
 297                         PROC_LOCK(p);
 298                         break;
 299                 }
 300         sx_sunlock(&allproc_lock);
 301         return (p);
 302 }
 303
 304 /*
 305  * Locate a process group by number.
 306  * The caller must hold proctree_lock.
 307  */
 308 struct pgrp *
 309 pgfind(pgid)
 310         register pid_t pgid;
 311 {
 312         register struct pgrp *pgrp;
 313
 314         sx_assert(&proctree_lock, SX_LOCKED);
 315
 316         LIST_FOREACH(pgrp, PGRPHASH(pgid), pg_hash) {
 317                 if (pgrp->pg_id == pgid) {
 318                         PGRP_LOCK(pgrp);
 319                         return (pgrp);
 320                 }
 321         }
 322         return (NULL);
 323 }
 324
 325 /*
 326  * Create a new process group.
 327  * pgid must be equal to the pid of p.
 328  * Begin a new session if required.
 329  */
 330 int
 331 enterpgrp(p, pgid, pgrp, sess)
 332         register struct proc *p;
 333         pid_t pgid;
 334         struct pgrp *pgrp;
 335         struct session *sess;
 336 {
 337         struct pgrp *pgrp2;
 338
 339         sx_assert(&proctree_lock, SX_XLOCKED);
 340
 341         KASSERT(pgrp != NULL, ("enterpgrp: pgrp == NULL"));
 342         KASSERT(p->p_pid == pgid,
 343             ("enterpgrp: new pgrp and pid != pgid"));
 344
 345         pgrp2 = pgfind(pgid);
 346
 347         KASSERT(pgrp2 == NULL,
 348             ("enterpgrp: pgrp with pgid exists"));
 349         KASSERT(!SESS_LEADER(p),
 350             ("enterpgrp: session leader attempted setpgrp"));
 351
 352         mtx_init(&pgrp->pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK);
 353
 354         if (sess != NULL) {
 355                 /*
 356                  * new session
 357                  */
 358                 mtx_init(&sess->s_mtx, "session", NULL, MTX_DEF);
 359                 PROC_LOCK(p);
 360                 p->p_flag &= ~P_CONTROLT;
 361                 PROC_UNLOCK(p);
 362                 PGRP_LOCK(pgrp);
 363                 sess->s_leader = p;
 364                 sess->s_sid = p->p_pid;
 365                 refcount_init(&sess->s_count, 1);
 366                 sess->s_ttyvp = NULL;
 367                 sess->s_ttyp = NULL;
 368                 bcopy(p->p_session->s_login, sess->s_login,
 369                             sizeof(sess->s_login));
 370                 pgrp->pg_session = sess;
 371                 KASSERT(p == curproc,
 372                     ("enterpgrp: mksession and p != curproc"));
 373         } else {
 374                 pgrp->pg_session = p->p_session;
 375                 sess_hold(pgrp->pg_session);
 376                 PGRP_LOCK(pgrp);
 377         }
 378         pgrp->pg_id = pgid;
 379         LIST_INIT(&pgrp->pg_members);
 380
 381         /*
 382          * As we have an exclusive lock of proctree_lock,
 383          * this should not deadlock.
 384          */
 385         LIST_INSERT_HEAD(PGRPHASH(pgid), pgrp, pg_hash);
 386         pgrp->pg_jobc = 0;
 387         SLIST_INIT(&pgrp->pg_sigiolst);
 388         PGRP_UNLOCK(pgrp);
 389
 390         doenterpgrp(p, pgrp);
 391
 392         return (0);
 393 }
 394
 395 /*
 396  * Move p to an existing process group
 397  */
 398 int
 399 enterthispgrp(p, pgrp)
 400         register struct proc *p;
 401         struct pgrp *pgrp;
 402 {
 403
 404         sx_assert(&proctree_lock, SX_XLOCKED);
 405         PROC_LOCK_ASSERT(p, MA_NOTOWNED);
 406         PGRP_LOCK_ASSERT(pgrp, MA_NOTOWNED);
 407         PGRP_LOCK_ASSERT(p->p_pgrp, MA_NOTOWNED);
 408         SESS_LOCK_ASSERT(p->p_session, MA_NOTOWNED);
 409         KASSERT(pgrp->pg_session == p->p_session,
 410                 ("%s: pgrp's session %p, p->p_session %p.\n",
 411                 __func__,
 412                 pgrp->pg_session,
 413                 p->p_session));
 414         KASSERT(pgrp != p->p_pgrp,
 415                 ("%s: p belongs to pgrp.", __func__));
 416
 417         doenterpgrp(p, pgrp);
 418
 419         return (0);
 420 }
 421
 422 /*
 423  * Move p to a process group
 424  */
 425 static void
 426 doenterpgrp(p, pgrp)
 427         struct proc *p;
 428         struct pgrp *pgrp;
 429 {
 430         struct pgrp *savepgrp;
 431
 432         sx_assert(&proctree_lock, SX_XLOCKED);
 433         PROC_LOCK_ASSERT(p, MA_NOTOWNED);
 434         PGRP_LOCK_ASSERT(pgrp, MA_NOTOWNED);
 435         PGRP_LOCK_ASSERT(p->p_pgrp, MA_NOTOWNED);
 436         SESS_LOCK_ASSERT(p->p_session, MA_NOTOWNED);
 437
 438         savepgrp = p->p_pgrp;
 439
 440         /*
 441          * Adjust eligibility of affected pgrps to participate in job control.
 442          * Increment eligibility counts before decrementing, otherwise we
 443          * could reach 0 spuriously during the first call.
 444          */
 445         fixjobc(p, pgrp, 1);
 446         fixjobc(p, p->p_pgrp, 0);
 447
 448         PGRP_LOCK(pgrp);
 449         PGRP_LOCK(savepgrp);
 450         PROC_LOCK(p);
 451         LIST_REMOVE(p, p_pglist);
 452         p->p_pgrp = pgrp;
 453         PROC_UNLOCK(p);
 454         LIST_INSERT_HEAD(&pgrp->pg_members, p, p_pglist);
 455         PGRP_UNLOCK(savepgrp);
 456         PGRP_UNLOCK(pgrp);
 457         if (LIST_EMPTY(&savepgrp->pg_members))
 458                 pgdelete(savepgrp);
 459 }
 460
 461 /*
 462  * remove process from process group
 463  */
 464 int
 465 leavepgrp(p)
 466         register struct proc *p;
 467 {
 468         struct pgrp *savepgrp;
 469
 470         sx_assert(&proctree_lock, SX_XLOCKED);
 471         savepgrp = p->p_pgrp;
 472         PGRP_LOCK(savepgrp);
 473         PROC_LOCK(p);
 474         LIST_REMOVE(p, p_pglist);
 475         p->p_pgrp = NULL;
 476         PROC_UNLOCK(p);
 477         PGRP_UNLOCK(savepgrp);
 478         if (LIST_EMPTY(&savepgrp->pg_members))
 479                 pgdelete(savepgrp);
 480         return (0);
 481 }
 482
 483 /*
 484  * delete a process group
 485  */
 486 static void
 487 pgdelete(pgrp)
 488         register struct pgrp *pgrp;
 489 {
 490         struct session *savesess;
 491         struct tty *tp;
 492
 493         sx_assert(&proctree_lock, SX_XLOCKED);
 494         PGRP_LOCK_ASSERT(pgrp, MA_NOTOWNED);
 495         SESS_LOCK_ASSERT(pgrp->pg_session, MA_NOTOWNED);
 496
 497         /*
 498          * Reset any sigio structures pointing to us as a result of
 499          * F_SETOWN with our pgid.
 500          */
 501         funsetownlst(&pgrp->pg_sigiolst);
 502
 503         PGRP_LOCK(pgrp);
 504         tp = pgrp->pg_session->s_ttyp;
 505         LIST_REMOVE(pgrp, pg_hash);
 506         savesess = pgrp->pg_session;
 507         PGRP_UNLOCK(pgrp);
 508
 509         /* Remove the reference to the pgrp before deallocating it. */
 510         if (tp != NULL) {
 511                 tty_lock(tp);
 512                 tty_rel_pgrp(tp, pgrp);
 513         }
 514
 515         mtx_destroy(&pgrp->pg_mtx);
 516         free(pgrp, M_PGRP);
 517         sess_release(savesess);
 518 }
 519
 520 static void
 521 pgadjustjobc(pgrp, entering)
 522         struct pgrp *pgrp;
 523         int entering;
 524 {
 525
 526         PGRP_LOCK(pgrp);
 527         if (entering)
 528                 pgrp->pg_jobc++;
 529         else {
 530                 --pgrp->pg_jobc;
 531                 if (pgrp->pg_jobc == 0)
 532                         orphanpg(pgrp);
 533         }
 534         PGRP_UNLOCK(pgrp);
 535 }
 536
 537 /*
 538  * Adjust pgrp jobc counters when specified process changes process group.
 539  * We count the number of processes in each process group that "qualify"
 540  * the group for terminal job control (those with a parent in a different
 541  * process group of the same session).  If that count reaches zero, the
 542  * process group becomes orphaned.  Check both the specified process'
 543  * process group and that of its children.
 544  * entering == 0 => p is leaving specified group.
 545  * entering == 1 => p is entering specified group.
 546  */
 547 void
 548 fixjobc(p, pgrp, entering)
 549         register struct proc *p;
 550         register struct pgrp *pgrp;
 551         int entering;
 552 {
 553         register struct pgrp *hispgrp;
 554         register struct session *mysession;
 555
 556         sx_assert(&proctree_lock, SX_LOCKED);
 557         PROC_LOCK_ASSERT(p, MA_NOTOWNED);
 558         PGRP_LOCK_ASSERT(pgrp, MA_NOTOWNED);
 559         SESS_LOCK_ASSERT(pgrp->pg_session, MA_NOTOWNED);
 560
 561         /*
 562          * Check p's parent to see whether p qualifies its own process
 563          * group; if so, adjust count for p's process group.
 564          */
 565         mysession = pgrp->pg_session;
 566         if ((hispgrp = p->p_pptr->p_pgrp) != pgrp &&
 567             hispgrp->pg_session == mysession)
 568                 pgadjustjobc(pgrp, entering);
 569
 570         /*
 571          * Check this process' children to see whether they qualify
 572          * their process groups; if so, adjust counts for children's
 573          * process groups.
 574          */
 575         LIST_FOREACH(p, &p->p_children, p_sibling) {
 576                 hispgrp = p->p_pgrp;
 577                 if (hispgrp == pgrp ||
 578                     hispgrp->pg_session != mysession)
 579                         continue;
 580                 PROC_LOCK(p);
 581                 if (p->p_state == PRS_ZOMBIE) {
 582                         PROC_UNLOCK(p);
 583                         continue;
 584                 }
 585                 PROC_UNLOCK(p);
 586                 pgadjustjobc(hispgrp, entering);
 587         }
 588 }
 589
 590 /*
 591  * A process group has become orphaned;
 592  * if there are any stopped processes in the group,
 593  * hang-up all process in that group.
 594  */
 595 static void
 596 orphanpg(pg)
 597         struct pgrp *pg;
 598 {
 599         register struct proc *p;
 600
 601         PGRP_LOCK_ASSERT(pg, MA_OWNED);
 602
 603         LIST_FOREACH(p, &pg->pg_members, p_pglist) {
 604                 PROC_LOCK(p);
 605                 if (P_SHOULDSTOP(p)) {
 606                         PROC_UNLOCK(p);
 607                         LIST_FOREACH(p, &pg->pg_members, p_pglist) {
 608                                 PROC_LOCK(p);
 609                                 psignal(p, SIGHUP);
 610                                 psignal(p, SIGCONT);
 611                                 PROC_UNLOCK(p);
 612                         }
 613                         return;
 614                 }
 615                 PROC_UNLOCK(p);
 616         }
 617 }
 618
 619 void
 620 sess_hold(struct session *s)
 621 {
 622
 623         refcount_acquire(&s->s_count);
 624 }
 625
 626 void
 627 sess_release(struct session *s)
 628 {
 629
 630         if (refcount_release(&s->s_count)) {
 631                 if (s->s_ttyp != NULL) {
 632                         tty_lock(s->s_ttyp);
 633                         tty_rel_sess(s->s_ttyp, s);
 634                 }
 635                 mtx_destroy(&s->s_mtx);
 636                 free(s, M_SESSION);
 637         }
 638 }
 639
 640 #include "opt_ddb.h"
 641 #ifdef DDB
 642 #include <ddb/ddb.h>
 643
 644 DB_SHOW_COMMAND(pgrpdump, pgrpdump)
 645 {
 646         register struct pgrp *pgrp;
 647         register struct proc *p;
 648         register int i;
 649
 650         for (i = 0; i <= pgrphash; i++) {
 651                 if (!LIST_EMPTY(&pgrphashtbl[i])) {
 652                         printf("\tindx %d\n", i);
 653                         LIST_FOREACH(pgrp, &pgrphashtbl[i], pg_hash) {
 654                                 printf(
 655                         "\tpgrp %p, pgid %ld, sess %p, sesscnt %d, mem %p\n",
 656                                     (void *)pgrp, (long)pgrp->pg_id,
 657                                     (void *)pgrp->pg_session,
 658                                     pgrp->pg_session->s_count,
 659                                     (void *)LIST_FIRST(&pgrp->pg_members));
 660                                 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
 661                                         printf("\t\tpid %ld addr %p pgrp %p\n",
 662                                             (long)p->p_pid, (void *)p,
 663                                             (void *)p->p_pgrp);
 664                                 }
 665                         }
 666                 }
 667         }
 668 }
 669 #endif /* DDB */
 670
 671 /*
 672  * Calculate the kinfo_proc members which contain process-wide
 673  * informations.
 674  * Must be called with the target process locked.
 675  */
 676 static void
 677 fill_kinfo_aggregate(struct proc *p, struct kinfo_proc *kp)
 678 {
 679         struct thread *td;
 680
 681         PROC_LOCK_ASSERT(p, MA_OWNED);
 682
 683         kp->ki_estcpu = 0;
 684         kp->ki_pctcpu = 0;
 685         FOREACH_THREAD_IN_PROC(p, td) {
 686                 thread_lock(td);
 687                 kp->ki_pctcpu += sched_pctcpu(td);
 688                 kp->ki_estcpu += td->td_estcpu;
 689                 thread_unlock(td);
 690         }
 691 }
 692
 693 /*
 694  * Clear kinfo_proc and fill in any information that is common
 695  * to all threads in the process.
 696  * Must be called with the target process locked.
 697  */
 698 static void
 699 fill_kinfo_proc_only(struct proc *p, struct kinfo_proc *kp)
 700 {
 701         struct thread *td0;
 702         struct tty *tp;
 703         struct session *sp;
 704         struct ucred *cred;
 705         struct sigacts *ps;
 706
 707         PROC_LOCK_ASSERT(p, MA_OWNED);
 708         bzero(kp, sizeof(*kp));
 709
 710         kp->ki_structsize = sizeof(*kp);
 711         kp->ki_paddr = p;
 712         kp->ki_addr =/* p->p_addr; */0; /* XXX */
 713         kp->ki_args = p->p_args;
 714         kp->ki_textvp = p->p_textvp;
 715 #ifdef KTRACE
 716         kp->ki_tracep = p->p_tracevp;
 717         kp->ki_traceflag = p->p_traceflag;
 718 #endif
 719         kp->ki_fd = p->p_fd;
 720         kp->ki_vmspace = p->p_vmspace;
 721         kp->ki_flag = p->p_flag;
 722         cred = p->p_ucred;
 723         if (cred) {
 724                 kp->ki_uid = cred->cr_uid;
 725                 kp->ki_ruid = cred->cr_ruid;
 726                 kp->ki_svuid = cred->cr_svuid;
 727                 kp->ki_cr_flags = cred->cr_flags;
 728                 /* XXX bde doesn't like KI_NGROUPS */
 729                 if (cred->cr_ngroups > KI_NGROUPS) {
 730                         kp->ki_ngroups = KI_NGROUPS;
 731                         kp->ki_cr_flags |= KI_CRF_GRP_OVERFLOW;
 732                 } else
 733                         kp->ki_ngroups = cred->cr_ngroups;
 734                 bcopy(cred->cr_groups, kp->ki_groups,
 735                     kp->ki_ngroups * sizeof(gid_t));
 736                 kp->ki_rgid = cred->cr_rgid;
 737                 kp->ki_svgid = cred->cr_svgid;
 738                 /* If jailed(cred), emulate the old P_JAILED flag. */
 739                 if (jailed(cred)) {
 740                         kp->ki_flag |= P_JAILED;
 741                         /* If inside the jail, use 0 as a jail ID. */
 742                         if (cred->cr_prison != curthread->td_ucred->cr_prison)
 743                                 kp->ki_jid = cred->cr_prison->pr_id;
 744                 }
 745         }
 746         ps = p->p_sigacts;
 747         if (ps) {
 748                 mtx_lock(&ps->ps_mtx);
 749                 kp->ki_sigignore = ps->ps_sigignore;
 750                 kp->ki_sigcatch = ps->ps_sigcatch;
 751                 mtx_unlock(&ps->ps_mtx);
 752         }
 753         PROC_SLOCK(p);
 754         if (p->p_state != PRS_NEW &&
 755             p->p_state != PRS_ZOMBIE &&
 756             p->p_vmspace != NULL) {
 757                 struct vmspace *vm = p->p_vmspace;
 758
 759                 kp->ki_size = vm->vm_map.size;
 760                 kp->ki_rssize = vmspace_resident_count(vm); /*XXX*/
 761                 FOREACH_THREAD_IN_PROC(p, td0) {
 762                         if (!TD_IS_SWAPPED(td0))
 763                                 kp->ki_rssize += td0->td_kstack_pages;
 764                 }
 765                 kp->ki_swrss = vm->vm_swrss;
 766                 kp->ki_tsize = vm->vm_tsize;
 767                 kp->ki_dsize = vm->vm_dsize;
 768                 kp->ki_ssize = vm->vm_ssize;
 769         } else if (p->p_state == PRS_ZOMBIE)
 770                 kp->ki_stat = SZOMB;
 771         if (kp->ki_flag & P_INMEM)
 772                 kp->ki_sflag = PS_INMEM;
 773         else
 774                 kp->ki_sflag = 0;
 775         /* Calculate legacy swtime as seconds since 'swtick'. */
 776         kp->ki_swtime = (ticks - p->p_swtick) / hz;
 777         kp->ki_pid = p->p_pid;
 778         kp->ki_nice = p->p_nice;
 779         rufetch(p, &kp->ki_rusage);
 780         kp->ki_runtime = cputick2usec(p->p_rux.rux_runtime);
 781         PROC_SUNLOCK(p);
 782         if ((p->p_flag & P_INMEM) && p->p_stats != NULL) {
 783                 kp->ki_start = p->p_stats->p_start;
 784                 timevaladd(&kp->ki_start, &boottime);
 785                 PROC_SLOCK(p);
 786                 calcru(p, &kp->ki_rusage.ru_utime, &kp->ki_rusage.ru_stime);
 787                 PROC_SUNLOCK(p);
 788                 calccru(p, &kp->ki_childutime, &kp->ki_childstime);
 789
 790                 /* Some callers want child-times in a single value */
 791                 kp->ki_childtime = kp->ki_childstime;
 792                 timevaladd(&kp->ki_childtime, &kp->ki_childutime);
 793         }
 794         tp = NULL;
 795         if (p->p_pgrp) {
 796                 kp->ki_pgid = p->p_pgrp->pg_id;
 797                 kp->ki_jobc = p->p_pgrp->pg_jobc;
 798                 sp = p->p_pgrp->pg_session;
 799
 800                 if (sp != NULL) {
 801                         kp->ki_sid = sp->s_sid;
 802                         SESS_LOCK(sp);
 803                         strlcpy(kp->ki_login, sp->s_login,
 804                             sizeof(kp->ki_login));
 805                         if (sp->s_ttyvp)
 806                                 kp->ki_kiflag |= KI_CTTY;
 807                         if (SESS_LEADER(p))
 808                                 kp->ki_kiflag |= KI_SLEADER;
 809                         /* XXX proctree_lock */
 810                         tp = sp->s_ttyp;
 811                         SESS_UNLOCK(sp);
 812                 }
 813         }
 814         if ((p->p_flag & P_CONTROLT) && tp != NULL) {
 815                 kp->ki_tdev = tty_udev(tp);
 816                 kp->ki_tpgid = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
 817                 if (tp->t_session)
 818                         kp->ki_tsid = tp->t_session->s_sid;
 819         } else
 820                 kp->ki_tdev = NODEV;
 821         if (p->p_comm[0] != '\0')
 822                 strlcpy(kp->ki_comm, p->p_comm, sizeof(kp->ki_comm));
 823         if (p->p_sysent && p->p_sysent->sv_name != NULL &&
 824             p->p_sysent->sv_name[0] != '\0')
 825                 strlcpy(kp->ki_emul, p->p_sysent->sv_name, sizeof(kp->ki_emul));
 826         kp->ki_siglist = p->p_siglist;
 827         kp->ki_xstat = p->p_xstat;
 828         kp->ki_acflag = p->p_acflag;
 829         kp->ki_lock = p->p_lock;
 830         if (p->p_pptr)
 831                 kp->ki_ppid = p->p_pptr->p_pid;
 832 }
 833
 834 /*
 835  * Fill in information that is thread specific.  Must be called with
 836  * target process locked.  If 'preferthread' is set, overwrite certain
 837  * process-related fields that are maintained for both threads and
 838  * processes.
 839  */
 840 static void
 841 fill_kinfo_thread(struct thread *td, struct kinfo_proc *kp, int preferthread)
 842 {
 843         struct proc *p;
 844
 845         p = td->td_proc;
 846         kp->ki_tdaddr = td;
 847         PROC_LOCK_ASSERT(p, MA_OWNED);
 848
 849         thread_lock(td);
 850         if (td->td_wmesg != NULL)
 851                 strlcpy(kp->ki_wmesg, td->td_wmesg, sizeof(kp->ki_wmesg));
 852         else
 853                 bzero(kp->ki_wmesg, sizeof(kp->ki_wmesg));
 854         strlcpy(kp->ki_ocomm, td->td_name, sizeof(kp->ki_ocomm));
 855         if (TD_ON_LOCK(td)) {
 856                 kp->ki_kiflag |= KI_LOCKBLOCK;
 857                 strlcpy(kp->ki_lockname, td->td_lockname,
 858                     sizeof(kp->ki_lockname));
 859         } else {
 860                 kp->ki_kiflag &= ~KI_LOCKBLOCK;
 861                 bzero(kp->ki_lockname, sizeof(kp->ki_lockname));
 862         }
 863
 864         if (p->p_state == PRS_NORMAL) { /* approximate. */
 865                 if (TD_ON_RUNQ(td) ||
 866                     TD_CAN_RUN(td) ||
 867                     TD_IS_RUNNING(td)) {
 868                         kp->ki_stat = SRUN;
 869                 } else if (P_SHOULDSTOP(p)) {
 870                         kp->ki_stat = SSTOP;
 871                 } else if (TD_IS_SLEEPING(td)) {
 872                         kp->ki_stat = SSLEEP;
 873                 } else if (TD_ON_LOCK(td)) {
 874                         kp->ki_stat = SLOCK;
 875                 } else {
 876                         kp->ki_stat = SWAIT;
 877                 }
 878         } else if (p->p_state == PRS_ZOMBIE) {
 879                 kp->ki_stat = SZOMB;
 880         } else {
 881                 kp->ki_stat = SIDL;
 882         }
 883
 884         /* Things in the thread */
 885         kp->ki_wchan = td->td_wchan;
 886         kp->ki_pri.pri_level = td->td_priority;
 887         kp->ki_pri.pri_native = td->td_base_pri;
 888         kp->ki_lastcpu = td->td_lastcpu;
 889         kp->ki_oncpu = td->td_oncpu;
 890         kp->ki_tdflags = td->td_flags;
 891         kp->ki_tid = td->td_tid;
 892         kp->ki_numthreads = p->p_numthreads;
 893         kp->ki_pcb = td->td_pcb;
 894         kp->ki_kstack = (void *)td->td_kstack;
 895         kp->ki_slptime = (ticks - td->td_slptick) / hz;
 896         kp->ki_pri.pri_class = td->td_pri_class;
 897         kp->ki_pri.pri_user = td->td_user_pri;
 898
 899         if (preferthread) {
 900                 kp->ki_runtime = cputick2usec(td->td_rux.rux_runtime);
 901                 kp->ki_pctcpu = sched_pctcpu(td);
 902                 kp->ki_estcpu = td->td_estcpu;
 903         }
 904
 905         /* We can't get this anymore but ps etc never used it anyway. */
 906         kp->ki_rqindex = 0;
 907
 908         if (preferthread)
 909                 kp->ki_siglist = td->td_siglist;
 910         kp->ki_sigmask = td->td_sigmask;
 911         thread_unlock(td);
 912 }
 913
 914 /*
 915  * Fill in a kinfo_proc structure for the specified process.
 916  * Must be called with the target process locked.
 917  */
 918 void
 919 fill_kinfo_proc(struct proc *p, struct kinfo_proc *kp)
 920 {
 921
 922         MPASS(FIRST_THREAD_IN_PROC(p) != NULL);
 923
 924         fill_kinfo_proc_only(p, kp);
 925         fill_kinfo_thread(FIRST_THREAD_IN_PROC(p), kp, 0);
 926         fill_kinfo_aggregate(p, kp);
 927 }
 928
 929 struct pstats *
 930 pstats_alloc(void)
 931 {
 932
 933         return (malloc(sizeof(struct pstats), M_SUBPROC, M_ZERO|M_WAITOK));
 934 }
 935
 936 /*
 937  * Copy parts of p_stats; zero the rest of p_stats (statistics).
 938  */
 939 void
 940 pstats_fork(struct pstats *src, struct pstats *dst)
 941 {
 942
 943         bzero(&dst->pstat_startzero,
 944             __rangeof(struct pstats, pstat_startzero, pstat_endzero));
 945         bcopy(&src->pstat_startcopy, &dst->pstat_startcopy,
 946             __rangeof(struct pstats, pstat_startcopy, pstat_endcopy));
 947 }
 948
 949 void
 950 pstats_free(struct pstats *ps)
 951 {
 952
 953         free(ps, M_SUBPROC);
 954 }
 955
 956 /*
 957  * Locate a zombie process by number
 958  */
 959 struct proc *
 960 zpfind(pid_t pid)
 961 {
 962         struct proc *p;
 963
 964         sx_slock(&allproc_lock);
 965         LIST_FOREACH(p, &zombproc, p_list)
 966                 if (p->p_pid == pid) {
 967                         PROC_LOCK(p);
 968                         break;
 969                 }
 970         sx_sunlock(&allproc_lock);
 971         return (p);
 972 }
 973
 974 #define KERN_PROC_ZOMBMASK      0x3
 975 #define KERN_PROC_NOTHREADS     0x4
 976
 977 #ifdef COMPAT_FREEBSD32
 978
 979 /*
 980  * This function is typically used to copy out the kernel address, so
 981  * it can be replaced by assignment of zero.
 982  */
 983 static inline uint32_t
 984 ptr32_trim(void *ptr)
 985 {
 986         uintptr_t uptr;
 987
 988         uptr = (uintptr_t)ptr;
 989         return ((uptr > UINT_MAX) ? 0 : uptr);
 990 }
 991
 992 #define PTRTRIM_CP(src,dst,fld) \
 993         do { (dst).fld = ptr32_trim((src).fld); } while (0)
 994
 995 static void
 996 freebsd32_kinfo_proc_out(const struct kinfo_proc *ki, struct kinfo_proc32 *ki32)
 997 {
 998         int i;
 999
1000         bzero(ki32, sizeof(struct kinfo_proc32));
1001         ki32->ki_structsize = sizeof(struct kinfo_proc32);
1002         CP(*ki, *ki32, ki_layout);
1003         PTRTRIM_CP(*ki, *ki32, ki_args);
1004         PTRTRIM_CP(*ki, *ki32, ki_paddr);
1005         PTRTRIM_CP(*ki, *ki32, ki_addr);
1006         PTRTRIM_CP(*ki, *ki32, ki_tracep);
1007         PTRTRIM_CP(*ki, *ki32, ki_textvp);
1008         PTRTRIM_CP(*ki, *ki32, ki_fd);
1009         PTRTRIM_CP(*ki, *ki32, ki_vmspace);
1010         PTRTRIM_CP(*ki, *ki32, ki_wchan);
1011         CP(*ki, *ki32, ki_pid);
1012         CP(*ki, *ki32, ki_ppid);
1013         CP(*ki, *ki32, ki_pgid);
1014         CP(*ki, *ki32, ki_tpgid);
1015         CP(*ki, *ki32, ki_sid);
1016         CP(*ki, *ki32, ki_tsid);
1017         CP(*ki, *ki32, ki_jobc);
1018         CP(*ki, *ki32, ki_tdev);
1019         CP(*ki, *ki32, ki_siglist);
1020         CP(*ki, *ki32, ki_sigmask);
1021         CP(*ki, *ki32, ki_sigignore);
1022         CP(*ki, *ki32, ki_sigcatch);
1023         CP(*ki, *ki32, ki_uid);
1024         CP(*ki, *ki32, ki_ruid);
1025         CP(*ki, *ki32, ki_svuid);
1026         CP(*ki, *ki32, ki_rgid);
1027         CP(*ki, *ki32, ki_svgid);
1028         CP(*ki, *ki32, ki_ngroups);
1029         for (i = 0; i < KI_NGROUPS; i++)
1030                 CP(*ki, *ki32, ki_groups[i]);
1031         CP(*ki, *ki32, ki_size);
1032         CP(*ki, *ki32, ki_rssize);
1033         CP(*ki, *ki32, ki_swrss);
1034         CP(*ki, *ki32, ki_tsize);
1035         CP(*ki, *ki32, ki_dsize);
1036         CP(*ki, *ki32, ki_ssize);
1037         CP(*ki, *ki32, ki_xstat);
1038         CP(*ki, *ki32, ki_acflag);
1039         CP(*ki, *ki32, ki_pctcpu);
1040         CP(*ki, *ki32, ki_estcpu);
1041         CP(*ki, *ki32, ki_slptime);
1042         CP(*ki, *ki32, ki_swtime);
1043         CP(*ki, *ki32, ki_runtime);
1044         TV_CP(*ki, *ki32, ki_start);
1045         TV_CP(*ki, *ki32, ki_childtime);
1046         CP(*ki, *ki32, ki_flag);
1047         CP(*ki, *ki32, ki_kiflag);
1048         CP(*ki, *ki32, ki_traceflag);
1049         CP(*ki, *ki32, ki_stat);
1050         CP(*ki, *ki32, ki_nice);
1051         CP(*ki, *ki32, ki_lock);
1052         CP(*ki, *ki32, ki_rqindex);
1053         CP(*ki, *ki32, ki_oncpu);
1054         CP(*ki, *ki32, ki_lastcpu);
1055         bcopy(ki->ki_ocomm, ki32->ki_ocomm, OCOMMLEN + 1);
1056         bcopy(ki->ki_wmesg, ki32->ki_wmesg, WMESGLEN + 1);
1057         bcopy(ki->ki_login, ki32->ki_login, LOGNAMELEN + 1);
1058         bcopy(ki->ki_lockname, ki32->ki_lockname, LOCKNAMELEN + 1);
1059         bcopy(ki->ki_comm, ki32->ki_comm, COMMLEN + 1);
1060         bcopy(ki->ki_emul, ki32->ki_emul, KI_EMULNAMELEN + 1);
1061         CP(*ki, *ki32, ki_cr_flags);
1062         CP(*ki, *ki32, ki_jid);
1063         CP(*ki, *ki32, ki_numthreads);
1064         CP(*ki, *ki32, ki_tid);
1065         CP(*ki, *ki32, ki_pri);
1066         freebsd32_rusage_out(&ki->ki_rusage, &ki32->ki_rusage);
1067         freebsd32_rusage_out(&ki->ki_rusage_ch, &ki32->ki_rusage_ch);
1068         PTRTRIM_CP(*ki, *ki32, ki_pcb);
1069         PTRTRIM_CP(*ki, *ki32, ki_kstack);
1070         PTRTRIM_CP(*ki, *ki32, ki_udata);
1071         CP(*ki, *ki32, ki_sflag);
1072         CP(*ki, *ki32, ki_tdflags);
1073 }
1074
1075 static int
1076 sysctl_out_proc_copyout(struct kinfo_proc *ki, struct sysctl_req *req)
1077 {
1078         struct kinfo_proc32 ki32;
1079         int error;
1080
1081         if (req->flags & SCTL_MASK32) {
1082                 freebsd32_kinfo_proc_out(ki, &ki32);
1083                 error = SYSCTL_OUT(req, &ki32, sizeof(struct kinfo_proc32));
1084         } else
1085                 error = SYSCTL_OUT(req, ki, sizeof(struct kinfo_proc));
1086         return (error);
1087 }
1088 #else
1089 static int
1090 sysctl_out_proc_copyout(struct kinfo_proc *ki, struct sysctl_req *req)
1091 {
1092
1093         return (SYSCTL_OUT(req, ki, sizeof(struct kinfo_proc)));
1094 }
1095 #endif
1096
1097 /*
1098  * Must be called with the process locked and will return with it unlocked.
1099  */
1100 static int
1101 sysctl_out_proc(struct proc *p, struct sysctl_req *req, int flags)
1102 {
1103         struct thread *td;
1104         struct kinfo_proc kinfo_proc;
1105         int error = 0;
1106         struct proc *np;
1107         pid_t pid = p->p_pid;
1108
1109         PROC_LOCK_ASSERT(p, MA_OWNED);
1110         MPASS(FIRST_THREAD_IN_PROC(p) != NULL);
1111
1112         fill_kinfo_proc(p, &kinfo_proc);
1113         if (flags & KERN_PROC_NOTHREADS)
1114                 error = sysctl_out_proc_copyout(&kinfo_proc, req);
1115         else {
1116                 FOREACH_THREAD_IN_PROC(p, td) {
1117                         fill_kinfo_thread(td, &kinfo_proc, 1);
1118                         error = sysctl_out_proc_copyout(&kinfo_proc, req);
1119                         if (error)
1120                                 break;
1121                 }
1122         }
1123         PROC_UNLOCK(p);
1124         if (error)
1125                 return (error);
1126         if (flags & KERN_PROC_ZOMBMASK)
1127                 np = zpfind(pid);
1128         else {
1129                 if (pid == 0)
1130                         return (0);
1131                 np = pfind(pid);
1132         }
1133         if (np == NULL)
1134                 return (ESRCH);
1135         if (np != p) {
1136                 PROC_UNLOCK(np);
1137                 return (ESRCH);
1138         }
1139         PROC_UNLOCK(np);
1140         return (0);
1141 }
1142
1143 static int
1144 sysctl_kern_proc(SYSCTL_HANDLER_ARGS)
1145 {
1146         int *name = (int*) arg1;
1147         u_int namelen = arg2;
1148         struct proc *p;
1149         int flags, doingzomb, oid_number;
1150         int error = 0;
1151
1152         oid_number = oidp->oid_number;
1153         if (oid_number != KERN_PROC_ALL &&
1154             (oid_number & KERN_PROC_INC_THREAD) == 0)
1155                 flags = KERN_PROC_NOTHREADS;
1156         else {
1157                 flags = 0;
1158                 oid_number &= ~KERN_PROC_INC_THREAD;
1159         }
1160         if (oid_number == KERN_PROC_PID) {
1161                 if (namelen != 1)
1162                         return (EINVAL);
1163                 error = sysctl_wire_old_buffer(req, 0);
1164                 if (error)
1165                         return (error);
1166                 p = pfind((pid_t)name[0]);
1167                 if (!p)
1168                         return (ESRCH);
1169                 if ((error = p_cansee(curthread, p))) {
1170                         PROC_UNLOCK(p);
1171                         return (error);
1172                 }
1173                 error = sysctl_out_proc(p, req, flags);
1174                 return (error);
1175         }
1176
1177         switch (oid_number) {
1178         case KERN_PROC_ALL:
1179                 if (namelen != 0)
1180                         return (EINVAL);
1181                 break;
1182         case KERN_PROC_PROC:
1183                 if (namelen != 0 && namelen != 1)
1184                         return (EINVAL);
1185                 break;
1186         default:
1187                 if (namelen != 1)
1188                         return (EINVAL);
1189                 break;
1190         }
1191
1192         if (!req->oldptr) {
1193                 /* overestimate by 5 procs */
1194                 error = SYSCTL_OUT(req, 0, sizeof (struct kinfo_proc) * 5);
1195                 if (error)
1196                         return (error);
1197         }
1198         error = sysctl_wire_old_buffer(req, 0);
1199         if (error != 0)
1200                 return (error);
1201         sx_slock(&allproc_lock);
1202         for (doingzomb=0 ; doingzomb < 2 ; doingzomb++) {
1203                 if (!doingzomb)
1204                         p = LIST_FIRST(&allproc);
1205                 else
1206                         p = LIST_FIRST(&zombproc);
1207                 for (; p != 0; p = LIST_NEXT(p, p_list)) {
1208                         /*
1209                          * Skip embryonic processes.
1210                          */
1211                         PROC_SLOCK(p);
1212                         if (p->p_state == PRS_NEW) {
1213                                 PROC_SUNLOCK(p);
1214                                 continue;
1215                         }
1216                         PROC_SUNLOCK(p);
1217                         PROC_LOCK(p);
1218                         KASSERT(p->p_ucred != NULL,
1219                             ("process credential is NULL for non-NEW proc"));
1220                         /*
1221                          * Show a user only appropriate processes.
1222                          */
1223                         if (p_cansee(curthread, p)) {
1224                                 PROC_UNLOCK(p);
1225                                 continue;
1226                         }
1227                         /*
1228                          * TODO - make more efficient (see notes below).
1229                          * do by session.
1230                          */
1231                         switch (oid_number) {
1232
1233                         case KERN_PROC_GID:
1234                                 if (p->p_ucred->cr_gid != (gid_t)name[0]) {
1235                                         PROC_UNLOCK(p);
1236                                         continue;
1237                                 }
1238                                 break;
1239
1240                         case KERN_PROC_PGRP:
1241                                 /* could do this by traversing pgrp */
1242                                 if (p->p_pgrp == NULL ||
1243                                     p->p_pgrp->pg_id != (pid_t)name[0]) {
1244                                         PROC_UNLOCK(p);
1245                                         continue;
1246                                 }
1247                                 break;
1248
1249                         case KERN_PROC_RGID:
1250                                 if (p->p_ucred->cr_rgid != (gid_t)name[0]) {
1251                                         PROC_UNLOCK(p);
1252                                         continue;
1253                                 }
1254                                 break;
1255
1256                         case KERN_PROC_SESSION:
1257                                 if (p->p_session == NULL ||
1258                                     p->p_session->s_sid != (pid_t)name[0]) {
1259                                         PROC_UNLOCK(p);
1260                                         continue;
1261                                 }
1262                                 break;
1263
1264                         case KERN_PROC_TTY:
1265                                 if ((p->p_flag & P_CONTROLT) == 0 ||
1266                                     p->p_session == NULL) {
1267                                         PROC_UNLOCK(p);
1268                                         continue;
1269                                 }
1270                                 /* XXX proctree_lock */
1271                                 SESS_LOCK(p->p_session);
1272                                 if (p->p_session->s_ttyp == NULL ||
1273                                     tty_udev(p->p_session->s_ttyp) !=
1274                                     (dev_t)name[0]) {
1275                                         SESS_UNLOCK(p->p_session);
1276                                         PROC_UNLOCK(p);
1277                                         continue;
1278                                 }
1279                                 SESS_UNLOCK(p->p_session);
1280                                 break;
1281
1282                         case KERN_PROC_UID:
1283                                 if (p->p_ucred->cr_uid != (uid_t)name[0]) {
1284                                         PROC_UNLOCK(p);
1285                                         continue;
1286                                 }
1287                                 break;
1288
1289                         case KERN_PROC_RUID:
1290                                 if (p->p_ucred->cr_ruid != (uid_t)name[0]) {
1291                                         PROC_UNLOCK(p);
1292                                         continue;
1293                                 }
1294                                 break;
1295
1296                         case KERN_PROC_PROC:
1297                                 break;
1298
1299                         default:
1300                                 break;
1301
1302                         }
1303
1304                         error = sysctl_out_proc(p, req, flags | doingzomb);
1305                         if (error) {
1306                                 sx_sunlock(&allproc_lock);
1307                                 return (error);
1308                         }
1309                 }
1310         }
1311         sx_sunlock(&allproc_lock);
1312         return (0);
1313 }
1314
1315 struct pargs *
1316 pargs_alloc(int len)
1317 {
1318         struct pargs *pa;
1319
1320         pa = malloc(sizeof(struct pargs) + len, M_PARGS,
1321                 M_WAITOK);
1322         refcount_init(&pa->ar_ref, 1);
1323         pa->ar_length = len;
1324         return (pa);
1325 }
1326
1327 static void
1328 pargs_free(struct pargs *pa)
1329 {
1330
1331         free(pa, M_PARGS);
1332 }
1333
1334 void
1335 pargs_hold(struct pargs *pa)
1336 {
1337
1338         if (pa == NULL)
1339                 return;
1340         refcount_acquire(&pa->ar_ref);
1341 }
1342
1343 void
1344 pargs_drop(struct pargs *pa)
1345 {
1346
1347         if (pa == NULL)
1348                 return;
1349         if (refcount_release(&pa->ar_ref))
1350                 pargs_free(pa);
1351 }
1352
1353 /*
1354  * This sysctl allows a process to retrieve the argument list or process
1355  * title for another process without groping around in the address space
1356  * of the other process.  It also allow a process to set its own "process
1357  * title to a string of its own choice.
1358  */
1359 static int
1360 sysctl_kern_proc_args(SYSCTL_HANDLER_ARGS)
1361 {
1362         int *name = (int*) arg1;
1363         u_int namelen = arg2;
1364         struct pargs *newpa, *pa;
1365         struct proc *p;
1366         int error = 0;
1367
1368         if (namelen != 1)
1369                 return (EINVAL);
1370
1371         p = pfind((pid_t)name[0]);
1372         if (!p)
1373                 return (ESRCH);
1374
1375         if ((error = p_cansee(curthread, p)) != 0) {
1376                 PROC_UNLOCK(p);
1377                 return (error);
1378         }
1379
1380         if (req->newptr && curproc != p) {
1381                 PROC_UNLOCK(p);
1382                 return (EPERM);
1383         }
1384
1385         pa = p->p_args;
1386         pargs_hold(pa);
1387         PROC_UNLOCK(p);
1388         if (req->oldptr != NULL && pa != NULL)
1389                 error = SYSCTL_OUT(req, pa->ar_args, pa->ar_length);
1390         pargs_drop(pa);
1391         if (error != 0 || req->newptr == NULL)
1392                 return (error);
1393
1394         if (req->newlen + sizeof(struct pargs) > ps_arg_cache_limit)
1395                 return (ENOMEM);
1396         newpa = pargs_alloc(req->newlen);
1397         error = SYSCTL_IN(req, newpa->ar_args, req->newlen);
1398         if (error != 0) {
1399                 pargs_free(newpa);
1400                 return (error);
1401         }
1402         PROC_LOCK(p);
1403         pa = p->p_args;
1404         p->p_args = newpa;
1405         PROC_UNLOCK(p);
1406         pargs_drop(pa);
1407         return (0);
1408 }
1409
1410 /*
1411  * This sysctl allows a process to retrieve the path of the executable for
1412  * itself or another process.
1413  */
1414 static int
1415 sysctl_kern_proc_pathname(SYSCTL_HANDLER_ARGS)
1416 {
1417         pid_t *pidp = (pid_t *)arg1;
1418         unsigned int arglen = arg2;
1419         struct proc *p;
1420         struct vnode *vp;
1421         char *retbuf, *freebuf;
1422         int error, vfslocked;
1423
1424         if (arglen != 1)
1425                 return (EINVAL);
1426         if (*pidp == -1) {      /* -1 means this process */
1427                 p = req->td->td_proc;
1428         } else {
1429                 p = pfind(*pidp);
1430                 if (p == NULL)
1431                         return (ESRCH);
1432                 if ((error = p_cansee(curthread, p)) != 0) {
1433                         PROC_UNLOCK(p);
1434                         return (error);
1435                 }
1436         }
1437
1438         vp = p->p_textvp;
1439         if (vp == NULL) {
1440                 if (*pidp != -1)
1441                         PROC_UNLOCK(p);
1442                 return (0);
1443         }
1444         vref(vp);
1445         if (*pidp != -1)
1446                 PROC_UNLOCK(p);
1447         error = vn_fullpath(req->td, vp, &retbuf, &freebuf);
1448         vfslocked = VFS_LOCK_GIANT(vp->v_mount);
1449         vrele(vp);
1450         VFS_UNLOCK_GIANT(vfslocked);
1451         if (error)
1452                 return (error);
1453         error = SYSCTL_OUT(req, retbuf, strlen(retbuf) + 1);
1454         free(freebuf, M_TEMP);
1455         return (error);
1456 }
1457
1458 static int
1459 sysctl_kern_proc_sv_name(SYSCTL_HANDLER_ARGS)
1460 {
1461         struct proc *p;
1462         char *sv_name;
1463         int *name;
1464         int namelen;
1465         int error;
1466
1467         namelen = arg2;
1468         if (namelen != 1)
1469                 return (EINVAL);
1470
1471         name = (int *)arg1;
1472         if ((p = pfind((pid_t)name[0])) == NULL)
1473                 return (ESRCH);
1474         if ((error = p_cansee(curthread, p))) {
1475                 PROC_UNLOCK(p);
1476                 return (error);
1477         }
1478         sv_name = p->p_sysent->sv_name;
1479         PROC_UNLOCK(p);
1480         return (sysctl_handle_string(oidp, sv_name, 0, req));
1481 }
1482
1483 #ifdef KINFO_OVMENTRY_SIZE
1484 CTASSERT(sizeof(struct kinfo_ovmentry) == KINFO_OVMENTRY_SIZE);
1485 #endif
1486
1487 #ifdef COMPAT_FREEBSD7
1488 static int
1489 sysctl_kern_proc_ovmmap(SYSCTL_HANDLER_ARGS)
1490 {
1491         vm_map_entry_t entry, tmp_entry;
1492         unsigned int last_timestamp;
1493         char *fullpath, *freepath;
1494         struct kinfo_ovmentry *kve;
1495         struct vattr va;
1496         struct ucred *cred;
1497         int error, *name;
1498         struct vnode *vp;
1499         struct proc *p;
1500         vm_map_t map;
1501         struct vmspace *vm;
1502
1503         name = (int *)arg1;
1504         if ((p = pfind((pid_t)name[0])) == NULL)
1505                 return (ESRCH);
1506         if (p->p_flag & P_WEXIT) {
1507                 PROC_UNLOCK(p);
1508                 return (ESRCH);
1509         }
1510         if ((error = p_candebug(curthread, p))) {
1511                 PROC_UNLOCK(p);
1512                 return (error);
1513         }
1514         _PHOLD(p);
1515         PROC_UNLOCK(p);
1516         vm = vmspace_acquire_ref(p);
1517         if (vm == NULL) {
1518                 PRELE(p);
1519                 return (ESRCH);
1520         }
1521         kve = malloc(sizeof(*kve), M_TEMP, M_WAITOK);
1522
1523         map = &p->p_vmspace->vm_map;    /* XXXRW: More locking required? */
1524         vm_map_lock_read(map);
1525         for (entry = map->header.next; entry != &map->header;
1526             entry = entry->next) {
1527                 vm_object_t obj, tobj, lobj;
1528                 vm_offset_t addr;
1529                 int vfslocked;
1530
1531                 if (entry->eflags & MAP_ENTRY_IS_SUB_MAP)
1532                         continue;
1533
1534                 bzero(kve, sizeof(*kve));
1535                 kve->kve_structsize = sizeof(*kve);
1536
1537                 kve->kve_private_resident = 0;
1538                 obj = entry->object.vm_object;
1539                 if (obj != NULL) {
1540                         VM_OBJECT_LOCK(obj);
1541                         if (obj->shadow_count == 1)
1542                                 kve->kve_private_resident =
1543                                     obj->resident_page_count;
1544                 }
1545                 kve->kve_resident = 0;
1546                 addr = entry->start;
1547                 while (addr < entry->end) {
1548                         if (pmap_extract(map->pmap, addr))
1549                                 kve->kve_resident++;
1550                         addr += PAGE_SIZE;
1551                 }
1552
1553                 for (lobj = tobj = obj; tobj; tobj = tobj->backing_object) {
1554                         if (tobj != obj)
1555                                 VM_OBJECT_LOCK(tobj);
1556                         if (lobj != obj)
1557                                 VM_OBJECT_UNLOCK(lobj);
1558                         lobj = tobj;
1559                 }
1560
1561                 kve->kve_start = (void*)entry->start;
1562                 kve->kve_end = (void*)entry->end;
1563                 kve->kve_offset = (off_t)entry->offset;
1564
1565                 if (entry->protection & VM_PROT_READ)
1566                         kve->kve_protection |= KVME_PROT_READ;
1567                 if (entry->protection & VM_PROT_WRITE)
1568                         kve->kve_protection |= KVME_PROT_WRITE;
1569                 if (entry->protection & VM_PROT_EXECUTE)
1570                         kve->kve_protection |= KVME_PROT_EXEC;
1571
1572                 if (entry->eflags & MAP_ENTRY_COW)
1573                         kve->kve_flags |= KVME_FLAG_COW;
1574                 if (entry->eflags & MAP_ENTRY_NEEDS_COPY)
1575                         kve->kve_flags |= KVME_FLAG_NEEDS_COPY;
1576                 if (entry->eflags & MAP_ENTRY_NOCOREDUMP)
1577                         kve->kve_flags |= KVME_FLAG_NOCOREDUMP;
1578
1579                 last_timestamp = map->timestamp;
1580                 vm_map_unlock_read(map);
1581
1582                 kve->kve_fileid = 0;
1583                 kve->kve_fsid = 0;
1584                 freepath = NULL;
1585                 fullpath = "";
1586                 if (lobj) {
1587                         vp = NULL;
1588                         switch (lobj->type) {
1589                         case OBJT_DEFAULT:
1590                                 kve->kve_type = KVME_TYPE_DEFAULT;
1591                                 break;
1592                         case OBJT_VNODE:
1593                                 kve->kve_type = KVME_TYPE_VNODE;
1594                                 vp = lobj->handle;
1595                                 vref(vp);
1596                                 break;
1597                         case OBJT_SWAP:
1598                                 kve->kve_type = KVME_TYPE_SWAP;
1599                                 break;
1600                         case OBJT_DEVICE:
1601                                 kve->kve_type = KVME_TYPE_DEVICE;
1602                                 break;
1603                         case OBJT_PHYS:
1604                                 kve->kve_type = KVME_TYPE_PHYS;
1605                                 break;
1606                         case OBJT_DEAD:
1607                                 kve->kve_type = KVME_TYPE_DEAD;
1608                                 break;
1609                         case OBJT_SG:
1610                                 kve->kve_type = KVME_TYPE_SG;
1611                                 break;
1612                         default:
1613                                 kve->kve_type = KVME_TYPE_UNKNOWN;
1614                                 break;
1615                         }
1616                         if (lobj != obj)
1617                                 VM_OBJECT_UNLOCK(lobj);
1618
1619                         kve->kve_ref_count = obj->ref_count;
1620                         kve->kve_shadow_count = obj->shadow_count;
1621                         VM_OBJECT_UNLOCK(obj);
1622                         if (vp != NULL) {
1623                                 vn_fullpath(curthread, vp, &fullpath,
1624                                     &freepath);
1625                                 cred = curthread->td_ucred;
1626                                 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
1627                                 vn_lock(vp, LK_SHARED | LK_RETRY);
1628                                 if (VOP_GETATTR(vp, &va, cred) == 0) {
1629                                         kve->kve_fileid = va.va_fileid;
1630                                         kve->kve_fsid = va.va_fsid;
1631                                 }
1632                                 vput(vp);
1633                                 VFS_UNLOCK_GIANT(vfslocked);
1634                         }
1635                 } else {
1636                         kve->kve_type = KVME_TYPE_NONE;
1637                         kve->kve_ref_count = 0;
1638                         kve->kve_shadow_count = 0;
1639                 }
1640
1641                 strlcpy(kve->kve_path, fullpath, sizeof(kve->kve_path));
1642                 if (freepath != NULL)
1643                         free(freepath, M_TEMP);
1644
1645                 error = SYSCTL_OUT(req, kve, sizeof(*kve));
1646                 vm_map_lock_read(map);
1647                 if (error)
1648                         break;
1649                 if (last_timestamp != map->timestamp) {
1650                         vm_map_lookup_entry(map, addr - 1, &tmp_entry);
1651                         entry = tmp_entry;
1652                 }
1653         }
1654         vm_map_unlock_read(map);
1655         vmspace_free(vm);
1656         PRELE(p);
1657         free(kve, M_TEMP);
1658         return (error);
1659 }
1660 #endif  /* COMPAT_FREEBSD7 */
1661
1662 #ifdef KINFO_VMENTRY_SIZE
1663 CTASSERT(sizeof(struct kinfo_vmentry) == KINFO_VMENTRY_SIZE);
1664 #endif
1665
1666 static int
1667 sysctl_kern_proc_vmmap(SYSCTL_HANDLER_ARGS)
1668 {
1669         vm_map_entry_t entry, tmp_entry;
1670         unsigned int last_timestamp;
1671         char *fullpath, *freepath;
1672         struct kinfo_vmentry *kve;
1673         struct vattr va;
1674         struct ucred *cred;
1675         int error, *name;
1676         struct vnode *vp;
1677         struct proc *p;
1678         struct vmspace *vm;
1679         vm_map_t map;
1680
1681         name = (int *)arg1;
1682         if ((p = pfind((pid_t)name[0])) == NULL)
1683                 return (ESRCH);
1684         if (p->p_flag & P_WEXIT) {
1685                 PROC_UNLOCK(p);
1686                 return (ESRCH);
1687         }
1688         if ((error = p_candebug(curthread, p))) {
1689                 PROC_UNLOCK(p);
1690                 return (error);
1691         }
1692         _PHOLD(p);
1693         PROC_UNLOCK(p);
1694         vm = vmspace_acquire_ref(p);
1695         if (vm == NULL) {
1696                 PRELE(p);
1697                 return (ESRCH);
1698         }
1699         kve = malloc(sizeof(*kve), M_TEMP, M_WAITOK);
1700
1701         map = &vm->vm_map;      /* XXXRW: More locking required? */
1702         vm_map_lock_read(map);
1703         for (entry = map->header.next; entry != &map->header;
1704             entry = entry->next) {
1705                 vm_object_t obj, tobj, lobj;
1706                 vm_offset_t addr;
1707                 int vfslocked;
1708
1709                 if (entry->eflags & MAP_ENTRY_IS_SUB_MAP)
1710                         continue;
1711
1712                 bzero(kve, sizeof(*kve));
1713
1714                 kve->kve_private_resident = 0;
1715                 obj = entry->object.vm_object;
1716                 if (obj != NULL) {
1717                         VM_OBJECT_LOCK(obj);
1718                         if (obj->shadow_count == 1)
1719                                 kve->kve_private_resident =
1720                                     obj->resident_page_count;
1721                 }
1722                 kve->kve_resident = 0;
1723                 addr = entry->start;
1724                 while (addr < entry->end) {
1725                         if (pmap_extract(map->pmap, addr))
1726                                 kve->kve_resident++;
1727                         addr += PAGE_SIZE;
1728                 }
1729
1730                 for (lobj = tobj = obj; tobj; tobj = tobj->backing_object) {
1731                         if (tobj != obj)
1732                                 VM_OBJECT_LOCK(tobj);
1733                         if (lobj != obj)
1734                                 VM_OBJECT_UNLOCK(lobj);
1735                         lobj = tobj;
1736                 }
1737
1738                 kve->kve_start = entry->start;
1739                 kve->kve_end = entry->end;
1740                 kve->kve_offset = entry->offset;
1741
1742                 if (entry->protection & VM_PROT_READ)
1743                         kve->kve_protection |= KVME_PROT_READ;
1744                 if (entry->protection & VM_PROT_WRITE)
1745                         kve->kve_protection |= KVME_PROT_WRITE;
1746                 if (entry->protection & VM_PROT_EXECUTE)
1747                         kve->kve_protection |= KVME_PROT_EXEC;
1748
1749                 if (entry->eflags & MAP_ENTRY_COW)
1750                         kve->kve_flags |= KVME_FLAG_COW;
1751                 if (entry->eflags & MAP_ENTRY_NEEDS_COPY)
1752                         kve->kve_flags |= KVME_FLAG_NEEDS_COPY;
1753                 if (entry->eflags & MAP_ENTRY_NOCOREDUMP)
1754                         kve->kve_flags |= KVME_FLAG_NOCOREDUMP;
1755
1756                 last_timestamp = map->timestamp;
1757                 vm_map_unlock_read(map);
1758
1759                 kve->kve_fileid = 0;
1760                 kve->kve_fsid = 0;
1761                 freepath = NULL;
1762                 fullpath = "";
1763                 if (lobj) {
1764                         vp = NULL;
1765                         switch (lobj->type) {
1766                         case OBJT_DEFAULT:
1767                                 kve->kve_type = KVME_TYPE_DEFAULT;
1768                                 break;
1769                         case OBJT_VNODE:
1770                                 kve->kve_type = KVME_TYPE_VNODE;
1771                                 vp = lobj->handle;
1772                                 vref(vp);
1773                                 break;
1774                         case OBJT_SWAP:
1775                                 kve->kve_type = KVME_TYPE_SWAP;
1776                                 break;
1777                         case OBJT_DEVICE:
1778                                 kve->kve_type = KVME_TYPE_DEVICE;
1779                                 break;
1780                         case OBJT_PHYS:
1781                                 kve->kve_type = KVME_TYPE_PHYS;
1782                                 break;
1783                         case OBJT_DEAD:
1784                                 kve->kve_type = KVME_TYPE_DEAD;
1785                                 break;
1786                         case OBJT_SG:
1787                                 kve->kve_type = KVME_TYPE_SG;
1788                                 break;
1789                         default:
1790                                 kve->kve_type = KVME_TYPE_UNKNOWN;
1791                                 break;
1792                         }
1793                         if (lobj != obj)
1794                                 VM_OBJECT_UNLOCK(lobj);
1795
1796                         kve->kve_ref_count = obj->ref_count;
1797                         kve->kve_shadow_count = obj->shadow_count;
1798                         VM_OBJECT_UNLOCK(obj);
1799                         if (vp != NULL) {
1800                                 vn_fullpath(curthread, vp, &fullpath,
1801                                     &freepath);
1802                                 cred = curthread->td_ucred;
1803                                 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
1804                                 vn_lock(vp, LK_SHARED | LK_RETRY);
1805                                 if (VOP_GETATTR(vp, &va, cred) == 0) {
1806                                         kve->kve_fileid = va.va_fileid;
1807                                         kve->kve_fsid = va.va_fsid;
1808                                 }
1809                                 vput(vp);
1810                                 VFS_UNLOCK_GIANT(vfslocked);
1811                         }
1812                 } else {
1813                         kve->kve_type = KVME_TYPE_NONE;
1814                         kve->kve_ref_count = 0;
1815                         kve->kve_shadow_count = 0;
1816                 }
1817
1818                 strlcpy(kve->kve_path, fullpath, sizeof(kve->kve_path));
1819                 if (freepath != NULL)
1820                         free(freepath, M_TEMP);
1821
1822                 /* Pack record size down */
1823                 kve->kve_structsize = offsetof(struct kinfo_vmentry, kve_path) +
1824                     strlen(kve->kve_path) + 1;
1825                 kve->kve_structsize = roundup(kve->kve_structsize,
1826                     sizeof(uint64_t));
1827                 error = SYSCTL_OUT(req, kve, kve->kve_structsize);
1828                 vm_map_lock_read(map);
1829                 if (error)
1830                         break;
1831                 if (last_timestamp != map->timestamp) {
1832                         vm_map_lookup_entry(map, addr - 1, &tmp_entry);
1833                         entry = tmp_entry;
1834                 }
1835         }
1836         vm_map_unlock_read(map);
1837         vmspace_free(vm);
1838         PRELE(p);
1839         free(kve, M_TEMP);
1840         return (error);
1841 }
1842
1843 #if defined(STACK) || defined(DDB)
1844 static int
1845 sysctl_kern_proc_kstack(SYSCTL_HANDLER_ARGS)
1846 {
1847         struct kinfo_kstack *kkstp;
1848         int error, i, *name, numthreads;
1849         lwpid_t *lwpidarray;
1850         struct thread *td;
1851         struct stack *st;
1852         struct sbuf sb;
1853         struct proc *p;
1854
1855         name = (int *)arg1;
1856         if ((p = pfind((pid_t)name[0])) == NULL)
1857                 return (ESRCH);
1858         /* XXXRW: Not clear ESRCH is the right error during proc execve(). */
1859         if (p->p_flag & P_WEXIT || p->p_flag & P_INEXEC) {
1860                 PROC_UNLOCK(p);
1861                 return (ESRCH);
1862         }
1863         if ((error = p_candebug(curthread, p))) {
1864                 PROC_UNLOCK(p);
1865                 return (error);
1866         }
1867         _PHOLD(p);
1868         PROC_UNLOCK(p);
1869
1870         kkstp = malloc(sizeof(*kkstp), M_TEMP, M_WAITOK);
1871         st = stack_create();
1872
1873         lwpidarray = NULL;
1874         numthreads = 0;
1875         PROC_LOCK(p);
1876 repeat:
1877         if (numthreads < p->p_numthreads) {
1878                 if (lwpidarray != NULL) {
1879                         free(lwpidarray, M_TEMP);
1880                         lwpidarray = NULL;
1881                 }
1882                 numthreads = p->p_numthreads;
1883                 PROC_UNLOCK(p);
1884                 lwpidarray = malloc(sizeof(*lwpidarray) * numthreads, M_TEMP,
1885                     M_WAITOK | M_ZERO);
1886                 PROC_LOCK(p);
1887                 goto repeat;
1888         }
1889         i = 0;
1890
1891         /*
1892          * XXXRW: During the below loop, execve(2) and countless other sorts
1893          * of changes could have taken place.  Should we check to see if the
1894          * vmspace has been replaced, or the like, in order to prevent
1895          * giving a snapshot that spans, say, execve(2), with some threads
1896          * before and some after?  Among other things, the credentials could
1897          * have changed, in which case the right to extract debug info might
1898          * no longer be assured.
1899          */
1900         FOREACH_THREAD_IN_PROC(p, td) {
1901                 KASSERT(i < numthreads,
1902                     ("sysctl_kern_proc_kstack: numthreads"));
1903                 lwpidarray[i] = td->td_tid;
1904                 i++;
1905         }
1906         numthreads = i;
1907         for (i = 0; i < numthreads; i++) {
1908                 td = thread_find(p, lwpidarray[i]);
1909                 if (td == NULL) {
1910                         continue;
1911                 }
1912                 bzero(kkstp, sizeof(*kkstp));
1913                 (void)sbuf_new(&sb, kkstp->kkst_trace,
1914                     sizeof(kkstp->kkst_trace), SBUF_FIXEDLEN);
1915                 thread_lock(td);
1916                 kkstp->kkst_tid = td->td_tid;
1917                 if (TD_IS_SWAPPED(td))
1918                         kkstp->kkst_state = KKST_STATE_SWAPPED;
1919                 else if (TD_IS_RUNNING(td))
1920                         kkstp->kkst_state = KKST_STATE_RUNNING;
1921                 else {
1922                         kkstp->kkst_state = KKST_STATE_STACKOK;
1923                         stack_save_td(st, td);
1924                 }
1925                 thread_unlock(td);
1926                 PROC_UNLOCK(p);
1927                 stack_sbuf_print(&sb, st);
1928                 sbuf_finish(&sb);
1929                 sbuf_delete(&sb);
1930                 error = SYSCTL_OUT(req, kkstp, sizeof(*kkstp));
1931                 PROC_LOCK(p);
1932                 if (error)
1933                         break;
1934         }
1935         _PRELE(p);
1936         PROC_UNLOCK(p);
1937         if (lwpidarray != NULL)
1938                 free(lwpidarray, M_TEMP);
1939         stack_destroy(st);
1940         free(kkstp, M_TEMP);
1941         return (error);
1942 }
1943 #endif
1944
1945 /*
1946  * This sysctl allows a process to retrieve the full list of groups from
1947  * itself or another process.
1948  */
1949 static int
1950 sysctl_kern_proc_groups(SYSCTL_HANDLER_ARGS)
1951 {
1952         pid_t *pidp = (pid_t *)arg1;
1953         unsigned int arglen = arg2;
1954         struct proc *p;
1955         struct ucred *cred;
1956         int error;
1957
1958         if (arglen != 1)
1959                 return (EINVAL);
1960         if (*pidp == -1) {      /* -1 means this process */
1961                 p = req->td->td_proc;
1962         } else {
1963                 p = pfind(*pidp);
1964                 if (p == NULL)
1965                         return (ESRCH);
1966                 if ((error = p_cansee(curthread, p)) != 0) {
1967                         PROC_UNLOCK(p);
1968                         return (error);
1969                 }
1970         }
1971
1972         cred = crhold(p->p_ucred);
1973         if (*pidp != -1)
1974                 PROC_UNLOCK(p);
1975
1976         error = SYSCTL_OUT(req, cred->cr_groups,
1977             cred->cr_ngroups * sizeof(gid_t));
1978         crfree(cred);
1979         return (error);
1980 }
1981
1982 SYSCTL_NODE(_kern, KERN_PROC, proc, CTLFLAG_RD,  0, "Process table");
1983
1984 SYSCTL_PROC(_kern_proc, KERN_PROC_ALL, all, CTLFLAG_RD|CTLTYPE_STRUCT|
1985         CTLFLAG_MPSAFE, 0, 0, sysctl_kern_proc, "S,proc",
1986         "Return entire process table");
1987
1988 static SYSCTL_NODE(_kern_proc, KERN_PROC_GID, gid, CTLFLAG_RD | CTLFLAG_MPSAFE,
1989         sysctl_kern_proc, "Process table");
1990
1991 static SYSCTL_NODE(_kern_proc, KERN_PROC_PGRP, pgrp, CTLFLAG_RD | CTLFLAG_MPSAFE,
1992         sysctl_kern_proc, "Process table");
1993
1994 static SYSCTL_NODE(_kern_proc, KERN_PROC_RGID, rgid, CTLFLAG_RD | CTLFLAG_MPSAFE,
1995         sysctl_kern_proc, "Process table");
1996
1997 static SYSCTL_NODE(_kern_proc, KERN_PROC_SESSION, sid, CTLFLAG_RD |
1998         CTLFLAG_MPSAFE, sysctl_kern_proc, "Process table");
1999
2000 static SYSCTL_NODE(_kern_proc, KERN_PROC_TTY, tty, CTLFLAG_RD | CTLFLAG_MPSAFE,
2001         sysctl_kern_proc, "Process table");
2002
2003 static SYSCTL_NODE(_kern_proc, KERN_PROC_UID, uid, CTLFLAG_RD | CTLFLAG_MPSAFE,
2004         sysctl_kern_proc, "Process table");
2005
2006 static SYSCTL_NODE(_kern_proc, KERN_PROC_RUID, ruid, CTLFLAG_RD | CTLFLAG_MPSAFE,
2007         sysctl_kern_proc, "Process table");
2008
2009 static SYSCTL_NODE(_kern_proc, KERN_PROC_PID, pid, CTLFLAG_RD | CTLFLAG_MPSAFE,
2010         sysctl_kern_proc, "Process table");
2011
2012 static SYSCTL_NODE(_kern_proc, KERN_PROC_PROC, proc, CTLFLAG_RD | CTLFLAG_MPSAFE,
2013         sysctl_kern_proc, "Return process table, no threads");
2014
2015 static SYSCTL_NODE(_kern_proc, KERN_PROC_ARGS, args,
2016         CTLFLAG_RW | CTLFLAG_ANYBODY | CTLFLAG_MPSAFE,
2017         sysctl_kern_proc_args, "Process argument list");
2018
2019 static SYSCTL_NODE(_kern_proc, KERN_PROC_PATHNAME, pathname, CTLFLAG_RD |
2020         CTLFLAG_MPSAFE, sysctl_kern_proc_pathname, "Process executable path");
2021
2022 static SYSCTL_NODE(_kern_proc, KERN_PROC_SV_NAME, sv_name, CTLFLAG_RD |
2023         CTLFLAG_MPSAFE, sysctl_kern_proc_sv_name,
2024         "Process syscall vector name (ABI type)");
2025
2026 static SYSCTL_NODE(_kern_proc, (KERN_PROC_GID | KERN_PROC_INC_THREAD), gid_td,
2027         CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_kern_proc, "Process table");
2028
2029 static SYSCTL_NODE(_kern_proc, (KERN_PROC_PGRP | KERN_PROC_INC_THREAD), pgrp_td,
2030         CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_kern_proc, "Process table");
2031
2032 static SYSCTL_NODE(_kern_proc, (KERN_PROC_RGID | KERN_PROC_INC_THREAD), rgid_td,
2033         CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_kern_proc, "Process table");
2034
2035 static SYSCTL_NODE(_kern_proc, (KERN_PROC_SESSION | KERN_PROC_INC_THREAD),
2036         sid_td, CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_kern_proc, "Process table");
2037
2038 static SYSCTL_NODE(_kern_proc, (KERN_PROC_TTY | KERN_PROC_INC_THREAD), tty_td,
2039         CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_kern_proc, "Process table");
2040
2041 static SYSCTL_NODE(_kern_proc, (KERN_PROC_UID | KERN_PROC_INC_THREAD), uid_td,
2042         CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_kern_proc, "Process table");
2043
2044 static SYSCTL_NODE(_kern_proc, (KERN_PROC_RUID | KERN_PROC_INC_THREAD), ruid_td,
2045         CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_kern_proc, "Process table");
2046
2047 static SYSCTL_NODE(_kern_proc, (KERN_PROC_PID | KERN_PROC_INC_THREAD), pid_td,
2048         CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_kern_proc, "Process table");
2049
2050 static SYSCTL_NODE(_kern_proc, (KERN_PROC_PROC | KERN_PROC_INC_THREAD), proc_td,
2051         CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_kern_proc,
2052         "Return process table, no threads");
2053
2054 #ifdef COMPAT_FREEBSD7
2055 static SYSCTL_NODE(_kern_proc, KERN_PROC_OVMMAP, ovmmap, CTLFLAG_RD |
2056         CTLFLAG_MPSAFE, sysctl_kern_proc_ovmmap, "Old Process vm map entries");
2057 #endif
2058
2059 static SYSCTL_NODE(_kern_proc, KERN_PROC_VMMAP, vmmap, CTLFLAG_RD |
2060         CTLFLAG_MPSAFE, sysctl_kern_proc_vmmap, "Process vm map entries");
2061
2062 #if defined(STACK) || defined(DDB)
2063 static SYSCTL_NODE(_kern_proc, KERN_PROC_KSTACK, kstack, CTLFLAG_RD |
2064         CTLFLAG_MPSAFE, sysctl_kern_proc_kstack, "Process kernel stacks");
2065 #endif
2066
2067 static SYSCTL_NODE(_kern_proc, KERN_PROC_GROUPS, groups, CTLFLAG_RD |
2068         CTLFLAG_MPSAFE, sysctl_kern_proc_groups, "Process groups");