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