lib/libkvm/kvm_proc.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1989, 1992, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software developed by the Computer Systems
   8  * Engineering group at Lawrence Berkeley Laboratory under DARPA contract
   9  * BG 91-66 and contributed to Berkeley.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <sys/cdefs.h>
  37 __FBSDID("$FreeBSD$");
  38 __SCCSID("@(#)kvm_proc.c        8.3 (Berkeley) 9/23/93");
  39
  40 /*
  41  * Proc traversal interface for kvm.  ps and w are (probably) the exclusive
  42  * users of this code, so we've factored it out into a separate module.
  43  * Thus, we keep this grunge out of the other kvm applications (i.e.,
  44  * most other applications are interested only in open/close/read/nlist).
  45  */
  46
  47 #include <sys/param.h>
  48 #define _WANT_UCRED     /* make ucred.h give us 'struct ucred' */
  49 #include <sys/ucred.h>
  50 #include <sys/queue.h>
  51 #include <sys/_lock.h>
  52 #include <sys/_mutex.h>
  53 #include <sys/_task.h>
  54 #include <sys/cpuset.h>
  55 #include <sys/user.h>
  56 #include <sys/proc.h>
  57 #define _WANT_PRISON    /* make jail.h give us 'struct prison' */
  58 #include <sys/jail.h>
  59 #include <sys/exec.h>
  60 #include <sys/stat.h>
  61 #include <sys/sysent.h>
  62 #include <sys/ioctl.h>
  63 #include <sys/tty.h>
  64 #include <sys/file.h>
  65 #include <sys/conf.h>
  66 #define _WANT_KW_EXITCODE
  67 #include <sys/wait.h>
  68 #include <stdio.h>
  69 #include <stdlib.h>
  70 #include <stdbool.h>
  71 #include <unistd.h>
  72 #include <nlist.h>
  73 #include <kvm.h>
  74
  75 #include <sys/sysctl.h>
  76
  77 #include <limits.h>
  78 #include <memory.h>
  79 #include <paths.h>
  80
  81 #include "kvm_private.h"
  82
  83 #define KREAD(kd, addr, obj) \
  84         (kvm_read(kd, addr, (char *)(obj), sizeof(*obj)) != sizeof(*obj))
  85
  86 static int ticks;
  87 static int hz;
  88 static uint64_t cpu_tick_frequency;
  89
  90 /*
  91  * From sys/kern/kern_tc.c. Depends on cpu_tick_frequency, which is
  92  * read/initialized before this function is ever called.
  93  */
  94 static uint64_t
  95 cputick2usec(uint64_t tick)
  96 {
  97
  98         if (cpu_tick_frequency == 0)
  99                 return (0);
 100         if (tick > 18446744073709551)           /* floor(2^64 / 1000) */
 101                 return (tick / (cpu_tick_frequency / 1000000));
 102         else if (tick > 18446744073709) /* floor(2^64 / 1000000) */
 103                 return ((tick * 1000) / (cpu_tick_frequency / 1000));
 104         else
 105                 return ((tick * 1000000) / cpu_tick_frequency);
 106 }
 107
 108 /*
 109  * Read proc's from memory file into buffer bp, which has space to hold
 110  * at most maxcnt procs.
 111  */
 112 static int
 113 kvm_proclist(kvm_t *kd, int what, int arg, struct proc *p,
 114     struct kinfo_proc *bp, int maxcnt)
 115 {
 116         int cnt = 0;
 117         struct kinfo_proc kinfo_proc, *kp;
 118         struct pgrp pgrp;
 119         struct session sess;
 120         struct cdev t_cdev;
 121         struct tty tty;
 122         struct vmspace vmspace;
 123         struct sigacts sigacts;
 124 #if 0
 125         struct pstats pstats;
 126 #endif
 127         struct ucred ucred;
 128         struct prison pr;
 129         struct thread mtd;
 130         struct proc proc;
 131         struct proc pproc;
 132         struct sysentvec sysent;
 133         char svname[KI_EMULNAMELEN];
 134         struct thread *td = NULL;
 135         bool first_thread;
 136
 137         kp = &kinfo_proc;
 138         kp->ki_structsize = sizeof(kinfo_proc);
 139         /*
 140          * Loop on the processes, then threads within the process if requested.
 141          */
 142         if (what == KERN_PROC_ALL)
 143                 what |= KERN_PROC_INC_THREAD;
 144         for (; cnt < maxcnt && p != NULL; p = LIST_NEXT(&proc, p_list)) {
 145                 memset(kp, 0, sizeof *kp);
 146                 if (KREAD(kd, (u_long)p, &proc)) {
 147                         _kvm_err(kd, kd->program, "can't read proc at %p", p);
 148                         return (-1);
 149                 }
 150                 if (proc.p_state == PRS_NEW)
 151                         continue;
 152                 if (KREAD(kd, (u_long)proc.p_ucred, &ucred) == 0) {
 153                         kp->ki_ruid = ucred.cr_ruid;
 154                         kp->ki_svuid = ucred.cr_svuid;
 155                         kp->ki_rgid = ucred.cr_rgid;
 156                         kp->ki_svgid = ucred.cr_svgid;
 157                         kp->ki_cr_flags = ucred.cr_flags;
 158                         if (ucred.cr_ngroups > KI_NGROUPS) {
 159                                 kp->ki_ngroups = KI_NGROUPS;
 160                                 kp->ki_cr_flags |= KI_CRF_GRP_OVERFLOW;
 161                         } else
 162                                 kp->ki_ngroups = ucred.cr_ngroups;
 163                         kvm_read(kd, (u_long)ucred.cr_groups, kp->ki_groups,
 164                             kp->ki_ngroups * sizeof(gid_t));
 165                         kp->ki_uid = ucred.cr_uid;
 166                         if (ucred.cr_prison != NULL) {
 167                                 if (KREAD(kd, (u_long)ucred.cr_prison, &pr)) {
 168                                         _kvm_err(kd, kd->program,
 169                                             "can't read prison at %p",
 170                                             ucred.cr_prison);
 171                                         return (-1);
 172                                 }
 173                                 kp->ki_jid = pr.pr_id;
 174                         }
 175                 }
 176
 177                 switch(what & ~KERN_PROC_INC_THREAD) {
 178
 179                 case KERN_PROC_GID:
 180                         if (kp->ki_groups[0] != (gid_t)arg)
 181                                 continue;
 182                         break;
 183
 184                 case KERN_PROC_PID:
 185                         if (proc.p_pid != (pid_t)arg)
 186                                 continue;
 187                         break;
 188
 189                 case KERN_PROC_RGID:
 190                         if (kp->ki_rgid != (gid_t)arg)
 191                                 continue;
 192                         break;
 193
 194                 case KERN_PROC_UID:
 195                         if (kp->ki_uid != (uid_t)arg)
 196                                 continue;
 197                         break;
 198
 199                 case KERN_PROC_RUID:
 200                         if (kp->ki_ruid != (uid_t)arg)
 201                                 continue;
 202                         break;
 203                 }
 204                 /*
 205                  * We're going to add another proc to the set.  If this
 206                  * will overflow the buffer, assume the reason is because
 207                  * nprocs (or the proc list) is corrupt and declare an error.
 208                  */
 209                 if (cnt >= maxcnt) {
 210                         _kvm_err(kd, kd->program, "nprocs corrupt");
 211                         return (-1);
 212                 }
 213                 /*
 214                  * gather kinfo_proc
 215                  */
 216                 kp->ki_paddr = p;
 217                 kp->ki_addr = 0;        /* XXX uarea */
 218                 /* kp->ki_kstack = proc.p_thread.td_kstack; XXXKSE */
 219                 kp->ki_args = proc.p_args;
 220                 kp->ki_numthreads = proc.p_numthreads;
 221                 kp->ki_tracep = proc.p_tracevp;
 222                 kp->ki_textvp = proc.p_textvp;
 223                 kp->ki_fd = proc.p_fd;
 224                 kp->ki_pd = proc.p_pd;
 225                 kp->ki_vmspace = proc.p_vmspace;
 226                 if (proc.p_sigacts != NULL) {
 227                         if (KREAD(kd, (u_long)proc.p_sigacts, &sigacts)) {
 228                                 _kvm_err(kd, kd->program,
 229                                     "can't read sigacts at %p", proc.p_sigacts);
 230                                 return (-1);
 231                         }
 232                         kp->ki_sigignore = sigacts.ps_sigignore;
 233                         kp->ki_sigcatch = sigacts.ps_sigcatch;
 234                 }
 235 #if 0
 236                 if ((proc.p_flag & P_INMEM) && proc.p_stats != NULL) {
 237                         if (KREAD(kd, (u_long)proc.p_stats, &pstats)) {
 238                                 _kvm_err(kd, kd->program,
 239                                     "can't read stats at %x", proc.p_stats);
 240                                 return (-1);
 241                         }
 242                         kp->ki_start = pstats.p_start;
 243
 244                         /*
 245                          * XXX: The times here are probably zero and need
 246                          * to be calculated from the raw data in p_rux and
 247                          * p_crux.
 248                          */
 249                         kp->ki_rusage = pstats.p_ru;
 250                         kp->ki_childstime = pstats.p_cru.ru_stime;
 251                         kp->ki_childutime = pstats.p_cru.ru_utime;
 252                         /* Some callers want child-times in a single value */
 253                         timeradd(&kp->ki_childstime, &kp->ki_childutime,
 254                             &kp->ki_childtime);
 255                 }
 256 #endif
 257                 if (proc.p_oppid)
 258                         kp->ki_ppid = proc.p_oppid;
 259                 else if (proc.p_pptr) {
 260                         if (KREAD(kd, (u_long)proc.p_pptr, &pproc)) {
 261                                 _kvm_err(kd, kd->program,
 262                                     "can't read pproc at %p", proc.p_pptr);
 263                                 return (-1);
 264                         }
 265                         kp->ki_ppid = pproc.p_pid;
 266                 } else
 267                         kp->ki_ppid = 0;
 268                 if (proc.p_pgrp == NULL)
 269                         goto nopgrp;
 270                 if (KREAD(kd, (u_long)proc.p_pgrp, &pgrp)) {
 271                         _kvm_err(kd, kd->program, "can't read pgrp at %p",
 272                                  proc.p_pgrp);
 273                         return (-1);
 274                 }
 275                 kp->ki_pgid = pgrp.pg_id;
 276                 kp->ki_jobc = pgrp.pg_jobc;
 277                 if (KREAD(kd, (u_long)pgrp.pg_session, &sess)) {
 278                         _kvm_err(kd, kd->program, "can't read session at %p",
 279                                 pgrp.pg_session);
 280                         return (-1);
 281                 }
 282                 kp->ki_sid = sess.s_sid;
 283                 (void)memcpy(kp->ki_login, sess.s_login,
 284                                                 sizeof(kp->ki_login));
 285                 if ((proc.p_flag & P_CONTROLT) && sess.s_ttyp != NULL) {
 286                         if (KREAD(kd, (u_long)sess.s_ttyp, &tty)) {
 287                                 _kvm_err(kd, kd->program,
 288                                          "can't read tty at %p", sess.s_ttyp);
 289                                 return (-1);
 290                         }
 291                         if (tty.t_dev != NULL) {
 292                                 if (KREAD(kd, (u_long)tty.t_dev, &t_cdev)) {
 293                                         _kvm_err(kd, kd->program,
 294                                                  "can't read cdev at %p",
 295                                                 tty.t_dev);
 296                                         return (-1);
 297                                 }
 298 #if 0
 299                                 kp->ki_tdev = t_cdev.si_udev;
 300 #else
 301                                 kp->ki_tdev = NODEV;
 302 #endif
 303                         }
 304                         if (tty.t_pgrp != NULL) {
 305                                 if (KREAD(kd, (u_long)tty.t_pgrp, &pgrp)) {
 306                                         _kvm_err(kd, kd->program,
 307                                                  "can't read tpgrp at %p",
 308                                                 tty.t_pgrp);
 309                                         return (-1);
 310                                 }
 311                                 kp->ki_tpgid = pgrp.pg_id;
 312                         } else
 313                                 kp->ki_tpgid = -1;
 314                         if (tty.t_session != NULL) {
 315                                 if (KREAD(kd, (u_long)tty.t_session, &sess)) {
 316                                         _kvm_err(kd, kd->program,
 317                                             "can't read session at %p",
 318                                             tty.t_session);
 319                                         return (-1);
 320                                 }
 321                                 kp->ki_tsid = sess.s_sid;
 322                         }
 323                 } else {
 324 nopgrp:
 325                         kp->ki_tdev = NODEV;
 326                 }
 327
 328                 (void)kvm_read(kd, (u_long)proc.p_vmspace,
 329                     (char *)&vmspace, sizeof(vmspace));
 330                 kp->ki_size = vmspace.vm_map.size;
 331                 /*
 332                  * Approximate the kernel's method of calculating
 333                  * this field.
 334                  */
 335 #define         pmap_resident_count(pm) ((pm)->pm_stats.resident_count)
 336                 kp->ki_rssize = pmap_resident_count(&vmspace.vm_pmap);
 337                 kp->ki_swrss = vmspace.vm_swrss;
 338                 kp->ki_tsize = vmspace.vm_tsize;
 339                 kp->ki_dsize = vmspace.vm_dsize;
 340                 kp->ki_ssize = vmspace.vm_ssize;
 341
 342                 switch (what & ~KERN_PROC_INC_THREAD) {
 343
 344                 case KERN_PROC_PGRP:
 345                         if (kp->ki_pgid != (pid_t)arg)
 346                                 continue;
 347                         break;
 348
 349                 case KERN_PROC_SESSION:
 350                         if (kp->ki_sid != (pid_t)arg)
 351                                 continue;
 352                         break;
 353
 354                 case KERN_PROC_TTY:
 355                         if ((proc.p_flag & P_CONTROLT) == 0 ||
 356                              kp->ki_tdev != (dev_t)arg)
 357                                 continue;
 358                         break;
 359                 }
 360                 if (proc.p_comm[0] != 0)
 361                         strlcpy(kp->ki_comm, proc.p_comm, MAXCOMLEN);
 362                 (void)kvm_read(kd, (u_long)proc.p_sysent, (char *)&sysent,
 363                     sizeof(sysent));
 364                 (void)kvm_read(kd, (u_long)sysent.sv_name, (char *)&svname,
 365                     sizeof(svname));
 366                 if (svname[0] != 0)
 367                         strlcpy(kp->ki_emul, svname, KI_EMULNAMELEN);
 368                 kp->ki_runtime = cputick2usec(proc.p_rux.rux_runtime);
 369                 kp->ki_pid = proc.p_pid;
 370                 kp->ki_xstat = KW_EXITCODE(proc.p_xexit, proc.p_xsig);
 371                 kp->ki_acflag = proc.p_acflag;
 372                 kp->ki_lock = proc.p_lock;
 373                 kp->ki_tdev_freebsd11 = kp->ki_tdev; /* truncate */
 374
 375                 /* Per-thread items; iterate as appropriate. */
 376                 td = TAILQ_FIRST(&proc.p_threads);
 377                 for (first_thread = true; cnt < maxcnt && td != NULL &&
 378                     (first_thread || (what & KERN_PROC_INC_THREAD));
 379                     first_thread = false) {
 380                         if (proc.p_state != PRS_ZOMBIE) {
 381                                 if (KREAD(kd, (u_long)td, &mtd)) {
 382                                         _kvm_err(kd, kd->program,
 383                                             "can't read thread at %p", td);
 384                                         return (-1);
 385                                 }
 386                                 if (what & KERN_PROC_INC_THREAD)
 387                                         td = TAILQ_NEXT(&mtd, td_plist);
 388                         } else
 389                                 td = NULL;
 390                         if ((proc.p_state != PRS_ZOMBIE) && mtd.td_wmesg)
 391                                 (void)kvm_read(kd, (u_long)mtd.td_wmesg,
 392                                     kp->ki_wmesg, WMESGLEN);
 393                         else
 394                                 memset(kp->ki_wmesg, 0, WMESGLEN);
 395                         if (proc.p_pgrp == NULL) {
 396                                 kp->ki_kiflag = 0;
 397                         } else {
 398                                 kp->ki_kiflag = sess.s_ttyvp ? KI_CTTY : 0;
 399                                 if (sess.s_leader == p)
 400                                         kp->ki_kiflag |= KI_SLEADER;
 401                         }
 402                         if ((proc.p_state != PRS_ZOMBIE) &&
 403                             (mtd.td_blocked != 0)) {
 404                                 kp->ki_kiflag |= KI_LOCKBLOCK;
 405                                 if (mtd.td_lockname)
 406                                         (void)kvm_read(kd,
 407                                             (u_long)mtd.td_lockname,
 408                                             kp->ki_lockname, LOCKNAMELEN);
 409                                 else
 410                                         memset(kp->ki_lockname, 0,
 411                                             LOCKNAMELEN);
 412                                 kp->ki_lockname[LOCKNAMELEN] = 0;
 413                         } else
 414                                 kp->ki_kiflag &= ~KI_LOCKBLOCK;
 415                         kp->ki_siglist = proc.p_siglist;
 416                         if (proc.p_state != PRS_ZOMBIE) {
 417                                 SIGSETOR(kp->ki_siglist, mtd.td_siglist);
 418                                 kp->ki_sigmask = mtd.td_sigmask;
 419                                 kp->ki_swtime = (ticks - proc.p_swtick) / hz;
 420                                 kp->ki_flag = proc.p_flag;
 421                                 kp->ki_sflag = 0;
 422                                 kp->ki_nice = proc.p_nice;
 423                                 kp->ki_traceflag = proc.p_traceflag;
 424                                 if (proc.p_state == PRS_NORMAL) {
 425                                         if (TD_ON_RUNQ(&mtd) ||
 426                                             TD_CAN_RUN(&mtd) ||
 427                                             TD_IS_RUNNING(&mtd)) {
 428                                                 kp->ki_stat = SRUN;
 429                                         } else if (mtd.td_state ==
 430                                             TDS_INHIBITED) {
 431                                                 if (P_SHOULDSTOP(&proc)) {
 432                                                         kp->ki_stat = SSTOP;
 433                                                 } else if (
 434                                                     TD_IS_SLEEPING(&mtd)) {
 435                                                         kp->ki_stat = SSLEEP;
 436                                                 } else if (TD_ON_LOCK(&mtd)) {
 437                                                         kp->ki_stat = SLOCK;
 438                                                 } else {
 439                                                         kp->ki_stat = SWAIT;
 440                                                 }
 441                                         }
 442                                 } else {
 443                                         kp->ki_stat = SIDL;
 444                                 }
 445                                 /* Stuff from the thread */
 446                                 kp->ki_pri.pri_level = mtd.td_priority;
 447                                 kp->ki_pri.pri_native = mtd.td_base_pri;
 448                                 kp->ki_lastcpu = mtd.td_lastcpu;
 449                                 kp->ki_wchan = mtd.td_wchan;
 450                                 kp->ki_oncpu = mtd.td_oncpu;
 451                                 if (mtd.td_name[0] != '\0')
 452                                         strlcpy(kp->ki_tdname, mtd.td_name,
 453                                             sizeof(kp->ki_tdname));
 454                                 else
 455                                         memset(kp->ki_tdname, 0,
 456                                             sizeof(kp->ki_tdname));
 457                                 kp->ki_pctcpu = 0;
 458                                 kp->ki_rqindex = 0;
 459
 460                                 /*
 461                                  * Note: legacy fields; wraps at NO_CPU_OLD
 462                                  * or the old max CPU value as appropriate
 463                                  */
 464                                 if (mtd.td_lastcpu == NOCPU)
 465                                         kp->ki_lastcpu_old = NOCPU_OLD;
 466                                 else if (mtd.td_lastcpu > MAXCPU_OLD)
 467                                         kp->ki_lastcpu_old = MAXCPU_OLD;
 468                                 else
 469                                         kp->ki_lastcpu_old = mtd.td_lastcpu;
 470
 471                                 if (mtd.td_oncpu == NOCPU)
 472                                         kp->ki_oncpu_old = NOCPU_OLD;
 473                                 else if (mtd.td_oncpu > MAXCPU_OLD)
 474                                         kp->ki_oncpu_old = MAXCPU_OLD;
 475                                 else
 476                                         kp->ki_oncpu_old = mtd.td_oncpu;
 477                                 kp->ki_tid = mtd.td_tid;
 478                         } else {
 479                                 memset(&kp->ki_sigmask, 0,
 480                                     sizeof(kp->ki_sigmask));
 481                                 kp->ki_stat = SZOMB;
 482                                 kp->ki_tid = 0;
 483                         }
 484
 485                         bcopy(&kinfo_proc, bp, sizeof(kinfo_proc));
 486                         ++bp;
 487                         ++cnt;
 488                 }
 489         }
 490         return (cnt);
 491 }
 492
 493 /*
 494  * Build proc info array by reading in proc list from a crash dump.
 495  * Return number of procs read.  maxcnt is the max we will read.
 496  */
 497 static int
 498 kvm_deadprocs(kvm_t *kd, int what, int arg, u_long a_allproc,
 499     u_long a_zombproc, int maxcnt)
 500 {
 501         struct kinfo_proc *bp = kd->procbase;
 502         int acnt, zcnt = 0;
 503         struct proc *p;
 504
 505         if (KREAD(kd, a_allproc, &p)) {
 506                 _kvm_err(kd, kd->program, "cannot read allproc");
 507                 return (-1);
 508         }
 509         acnt = kvm_proclist(kd, what, arg, p, bp, maxcnt);
 510         if (acnt < 0)
 511                 return (acnt);
 512
 513         if (a_zombproc != 0) {
 514                 if (KREAD(kd, a_zombproc, &p)) {
 515                         _kvm_err(kd, kd->program, "cannot read zombproc");
 516                         return (-1);
 517                 }
 518                 zcnt = kvm_proclist(kd, what, arg, p, bp + acnt, maxcnt - acnt);
 519                 if (zcnt < 0)
 520                         zcnt = 0;
 521         }
 522
 523         return (acnt + zcnt);
 524 }
 525
 526 struct kinfo_proc *
 527 kvm_getprocs(kvm_t *kd, int op, int arg, int *cnt)
 528 {
 529         int mib[4], st, nprocs;
 530         size_t size, osize;
 531         int temp_op;
 532
 533         if (kd->procbase != 0) {
 534                 free((void *)kd->procbase);
 535                 /*
 536                  * Clear this pointer in case this call fails.  Otherwise,
 537                  * kvm_close() will free it again.
 538                  */
 539                 kd->procbase = 0;
 540         }
 541         if (ISALIVE(kd)) {
 542                 size = 0;
 543                 mib[0] = CTL_KERN;
 544                 mib[1] = KERN_PROC;
 545                 mib[2] = op;
 546                 mib[3] = arg;
 547                 temp_op = op & ~KERN_PROC_INC_THREAD;
 548                 st = sysctl(mib,
 549                     temp_op == KERN_PROC_ALL || temp_op == KERN_PROC_PROC ?
 550                     3 : 4, NULL, &size, NULL, 0);
 551                 if (st == -1) {
 552                         _kvm_syserr(kd, kd->program, "kvm_getprocs");
 553                         return (0);
 554                 }
 555                 /*
 556                  * We can't continue with a size of 0 because we pass
 557                  * it to realloc() (via _kvm_realloc()), and passing 0
 558                  * to realloc() results in undefined behavior.
 559                  */
 560                 if (size == 0) {
 561                         /*
 562                          * XXX: We should probably return an invalid,
 563                          * but non-NULL, pointer here so any client
 564                          * program trying to dereference it will
 565                          * crash.  However, _kvm_freeprocs() calls
 566                          * free() on kd->procbase if it isn't NULL,
 567                          * and free()'ing a junk pointer isn't good.
 568                          * Then again, _kvm_freeprocs() isn't used
 569                          * anywhere . . .
 570                          */
 571                         kd->procbase = _kvm_malloc(kd, 1);
 572                         goto liveout;
 573                 }
 574                 do {
 575                         size += size / 10;
 576                         kd->procbase = (struct kinfo_proc *)
 577                             _kvm_realloc(kd, kd->procbase, size);
 578                         if (kd->procbase == NULL)
 579                                 return (0);
 580                         osize = size;
 581                         st = sysctl(mib, temp_op == KERN_PROC_ALL ||
 582                             temp_op == KERN_PROC_PROC ? 3 : 4,
 583                             kd->procbase, &size, NULL, 0);
 584                 } while (st == -1 && errno == ENOMEM && size == osize);
 585                 if (st == -1) {
 586                         _kvm_syserr(kd, kd->program, "kvm_getprocs");
 587                         return (0);
 588                 }
 589                 /*
 590                  * We have to check the size again because sysctl()
 591                  * may "round up" oldlenp if oldp is NULL; hence it
 592                  * might've told us that there was data to get when
 593                  * there really isn't any.
 594                  */
 595                 if (size > 0 &&
 596                     kd->procbase->ki_structsize != sizeof(struct kinfo_proc)) {
 597                         _kvm_err(kd, kd->program,
 598                             "kinfo_proc size mismatch (expected %zu, got %d)",
 599                             sizeof(struct kinfo_proc),
 600                             kd->procbase->ki_structsize);
 601                         return (0);
 602                 }
 603 liveout:
 604                 nprocs = size == 0 ? 0 : size / kd->procbase->ki_structsize;
 605         } else {
 606                 struct nlist nl[6], *p;
 607                 struct nlist nlz[2];
 608
 609                 nl[0].n_name = "_nprocs";
 610                 nl[1].n_name = "_allproc";
 611                 nl[2].n_name = "_ticks";
 612                 nl[3].n_name = "_hz";
 613                 nl[4].n_name = "_cpu_tick_frequency";
 614                 nl[5].n_name = 0;
 615
 616                 nlz[0].n_name = "_zombproc";
 617                 nlz[1].n_name = 0;
 618
 619                 if (!kd->arch->ka_native(kd)) {
 620                         _kvm_err(kd, kd->program,
 621                             "cannot read procs from non-native core");
 622                         return (0);
 623                 }
 624
 625                 if (kvm_nlist(kd, nl) != 0) {
 626                         for (p = nl; p->n_type != 0; ++p)
 627                                 ;
 628                         _kvm_err(kd, kd->program,
 629                                  "%s: no such symbol", p->n_name);
 630                         return (0);
 631                 }
 632                 (void) kvm_nlist(kd, nlz);      /* attempt to get zombproc */
 633                 if (KREAD(kd, nl[0].n_value, &nprocs)) {
 634                         _kvm_err(kd, kd->program, "can't read nprocs");
 635                         return (0);
 636                 }
 637                 /*
 638                  * If returning all threads, we don't know how many that
 639                  * might be.  Presume that there are, on average, no more
 640                  * than 10 threads per process.
 641                  */
 642                 if (op == KERN_PROC_ALL || (op & KERN_PROC_INC_THREAD))
 643                         nprocs *= 10;           /* XXX */
 644                 if (KREAD(kd, nl[2].n_value, &ticks)) {
 645                         _kvm_err(kd, kd->program, "can't read ticks");
 646                         return (0);
 647                 }
 648                 if (KREAD(kd, nl[3].n_value, &hz)) {
 649                         _kvm_err(kd, kd->program, "can't read hz");
 650                         return (0);
 651                 }
 652                 if (KREAD(kd, nl[4].n_value, &cpu_tick_frequency)) {
 653                         _kvm_err(kd, kd->program,
 654                             "can't read cpu_tick_frequency");
 655                         return (0);
 656                 }
 657                 size = nprocs * sizeof(struct kinfo_proc);
 658                 kd->procbase = (struct kinfo_proc *)_kvm_malloc(kd, size);
 659                 if (kd->procbase == NULL)
 660                         return (0);
 661
 662                 nprocs = kvm_deadprocs(kd, op, arg, nl[1].n_value,
 663                                       nlz[0].n_value, nprocs);
 664                 if (nprocs <= 0) {
 665                         _kvm_freeprocs(kd);
 666                         nprocs = 0;
 667                 }
 668 #ifdef notdef
 669                 else {
 670                         size = nprocs * sizeof(struct kinfo_proc);
 671                         kd->procbase = realloc(kd->procbase, size);
 672                 }
 673 #endif
 674         }
 675         *cnt = nprocs;
 676         return (kd->procbase);
 677 }
 678
 679 void
 680 _kvm_freeprocs(kvm_t *kd)
 681 {
 682
 683         free(kd->procbase);
 684         kd->procbase = NULL;
 685 }
 686
 687 void *
 688 _kvm_realloc(kvm_t *kd, void *p, size_t n)
 689 {
 690         void *np;
 691
 692         np = reallocf(p, n);
 693         if (np == NULL)
 694                 _kvm_err(kd, kd->program, "out of memory");
 695         return (np);
 696 }
 697
 698 /*
 699  * Get the command args or environment.
 700  */
 701 static char **
 702 kvm_argv(kvm_t *kd, const struct kinfo_proc *kp, int env, int nchr)
 703 {
 704         int oid[4];
 705         int i;
 706         size_t bufsz;
 707         static int buflen;
 708         static char *buf, *p;
 709         static char **bufp;
 710         static int argc;
 711         char **nbufp;
 712
 713         if (!ISALIVE(kd)) {
 714                 _kvm_err(kd, kd->program,
 715                     "cannot read user space from dead kernel");
 716                 return (NULL);
 717         }
 718
 719         if (nchr == 0 || nchr > ARG_MAX)
 720                 nchr = ARG_MAX;
 721         if (buflen == 0) {
 722                 buf = malloc(nchr);
 723                 if (buf == NULL) {
 724                         _kvm_err(kd, kd->program, "cannot allocate memory");
 725                         return (NULL);
 726                 }
 727                 argc = 32;
 728                 bufp = malloc(sizeof(char *) * argc);
 729                 if (bufp == NULL) {
 730                         free(buf);
 731                         buf = NULL;
 732                         _kvm_err(kd, kd->program, "cannot allocate memory");
 733                         return (NULL);
 734                 }
 735                 buflen = nchr;
 736         } else if (nchr > buflen) {
 737                 p = realloc(buf, nchr);
 738                 if (p != NULL) {
 739                         buf = p;
 740                         buflen = nchr;
 741                 }
 742         }
 743         oid[0] = CTL_KERN;
 744         oid[1] = KERN_PROC;
 745         oid[2] = env ? KERN_PROC_ENV : KERN_PROC_ARGS;
 746         oid[3] = kp->ki_pid;
 747         bufsz = buflen;
 748         if (sysctl(oid, 4, buf, &bufsz, 0, 0) == -1) {
 749                 /*
 750                  * If the supplied buf is too short to hold the requested
 751                  * value the sysctl returns with ENOMEM. The buf is filled
 752                  * with the truncated value and the returned bufsz is equal
 753                  * to the requested len.
 754                  */
 755                 if (errno != ENOMEM || bufsz != (size_t)buflen)
 756                         return (NULL);
 757                 buf[bufsz - 1] = '\0';
 758                 errno = 0;
 759         } else if (bufsz == 0)
 760                 return (NULL);
 761         i = 0;
 762         p = buf;
 763         do {
 764                 bufp[i++] = p;
 765                 p += strlen(p) + 1;
 766                 if (i >= argc) {
 767                         argc += argc;
 768                         nbufp = realloc(bufp, sizeof(char *) * argc);
 769                         if (nbufp == NULL)
 770                                 return (NULL);
 771                         bufp = nbufp;
 772                 }
 773         } while (p < buf + bufsz);
 774         bufp[i++] = 0;
 775         return (bufp);
 776 }
 777
 778 char **
 779 kvm_getargv(kvm_t *kd, const struct kinfo_proc *kp, int nchr)
 780 {
 781         return (kvm_argv(kd, kp, 0, nchr));
 782 }
 783
 784 char **
 785 kvm_getenvv(kvm_t *kd, const struct kinfo_proc *kp, int nchr)
 786 {
 787         return (kvm_argv(kd, kp, 1, nchr));
 788 }