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         if (cpu_tick_frequency == 0)
  98                 return (0);
  99         return ((tick / cpu_tick_frequency) * 1000000ULL) +
 100             ((tick % cpu_tick_frequency) * 1000000ULL) / cpu_tick_frequency;
 101 }
 102
 103 /*
 104  * Read proc's from memory file into buffer bp, which has space to hold
 105  * at most maxcnt procs.
 106  */
 107 static int
 108 kvm_proclist(kvm_t *kd, int what, int arg, struct proc *p,
 109     struct kinfo_proc *bp, int maxcnt)
 110 {
 111         int cnt = 0;
 112         struct kinfo_proc kinfo_proc, *kp;
 113         struct pgrp pgrp;
 114         struct session sess;
 115         struct cdev t_cdev;
 116         struct tty tty;
 117         struct vmspace vmspace;
 118         struct sigacts sigacts;
 119 #if 0
 120         struct pstats pstats;
 121 #endif
 122         struct ucred ucred;
 123         struct prison pr;
 124         struct thread mtd;
 125         struct proc proc;
 126         struct proc pproc;
 127         struct sysentvec sysent;
 128         char svname[KI_EMULNAMELEN];
 129         struct thread *td = NULL;
 130         bool first_thread;
 131
 132         kp = &kinfo_proc;
 133         kp->ki_structsize = sizeof(kinfo_proc);
 134         /*
 135          * Loop on the processes, then threads within the process if requested.
 136          */
 137         if (what == KERN_PROC_ALL)
 138                 what |= KERN_PROC_INC_THREAD;
 139         for (; cnt < maxcnt && p != NULL; p = LIST_NEXT(&proc, p_list)) {
 140                 memset(kp, 0, sizeof *kp);
 141                 if (KREAD(kd, (u_long)p, &proc)) {
 142                         _kvm_err(kd, kd->program, "can't read proc at %p", p);
 143                         return (-1);
 144                 }
 145                 if (proc.p_state == PRS_NEW)
 146                         continue;
 147                 if (KREAD(kd, (u_long)proc.p_ucred, &ucred) == 0) {
 148                         kp->ki_ruid = ucred.cr_ruid;
 149                         kp->ki_svuid = ucred.cr_svuid;
 150                         kp->ki_rgid = ucred.cr_rgid;
 151                         kp->ki_svgid = ucred.cr_svgid;
 152                         kp->ki_cr_flags = ucred.cr_flags;
 153                         if (ucred.cr_ngroups > KI_NGROUPS) {
 154                                 kp->ki_ngroups = KI_NGROUPS;
 155                                 kp->ki_cr_flags |= KI_CRF_GRP_OVERFLOW;
 156                         } else
 157                                 kp->ki_ngroups = ucred.cr_ngroups;
 158                         kvm_read(kd, (u_long)ucred.cr_groups, kp->ki_groups,
 159                             kp->ki_ngroups * sizeof(gid_t));
 160                         kp->ki_uid = ucred.cr_uid;
 161                         if (ucred.cr_prison != NULL) {
 162                                 if (KREAD(kd, (u_long)ucred.cr_prison, &pr)) {
 163                                         _kvm_err(kd, kd->program,
 164                                             "can't read prison at %p",
 165                                             ucred.cr_prison);
 166                                         return (-1);
 167                                 }
 168                                 kp->ki_jid = pr.pr_id;
 169                         }
 170                 }
 171
 172                 switch(what & ~KERN_PROC_INC_THREAD) {
 173
 174                 case KERN_PROC_GID:
 175                         if (kp->ki_groups[0] != (gid_t)arg)
 176                                 continue;
 177                         break;
 178
 179                 case KERN_PROC_PID:
 180                         if (proc.p_pid != (pid_t)arg)
 181                                 continue;
 182                         break;
 183
 184                 case KERN_PROC_RGID:
 185                         if (kp->ki_rgid != (gid_t)arg)
 186                                 continue;
 187                         break;
 188
 189                 case KERN_PROC_UID:
 190                         if (kp->ki_uid != (uid_t)arg)
 191                                 continue;
 192                         break;
 193
 194                 case KERN_PROC_RUID:
 195                         if (kp->ki_ruid != (uid_t)arg)
 196                                 continue;
 197                         break;
 198                 }
 199                 /*
 200                  * We're going to add another proc to the set.  If this
 201                  * will overflow the buffer, assume the reason is because
 202                  * nprocs (or the proc list) is corrupt and declare an error.
 203                  */
 204                 if (cnt >= maxcnt) {
 205                         _kvm_err(kd, kd->program, "nprocs corrupt");
 206                         return (-1);
 207                 }
 208                 /*
 209                  * gather kinfo_proc
 210                  */
 211                 kp->ki_paddr = p;
 212                 kp->ki_addr = 0;        /* XXX uarea */
 213                 /* kp->ki_kstack = proc.p_thread.td_kstack; XXXKSE */
 214                 kp->ki_args = proc.p_args;
 215                 kp->ki_numthreads = proc.p_numthreads;
 216                 kp->ki_tracep = NULL;   /* XXXKIB do not expose ktr_io_params */
 217                 kp->ki_textvp = proc.p_textvp;
 218                 kp->ki_fd = proc.p_fd;
 219                 kp->ki_pd = proc.p_pd;
 220                 kp->ki_vmspace = proc.p_vmspace;
 221                 if (proc.p_sigacts != NULL) {
 222                         if (KREAD(kd, (u_long)proc.p_sigacts, &sigacts)) {
 223                                 _kvm_err(kd, kd->program,
 224                                     "can't read sigacts at %p", proc.p_sigacts);
 225                                 return (-1);
 226                         }
 227                         kp->ki_sigignore = sigacts.ps_sigignore;
 228                         kp->ki_sigcatch = sigacts.ps_sigcatch;
 229                 }
 230 #if 0
 231                 if ((proc.p_flag & P_INMEM) && proc.p_stats != NULL) {
 232                         if (KREAD(kd, (u_long)proc.p_stats, &pstats)) {
 233                                 _kvm_err(kd, kd->program,
 234                                     "can't read stats at %x", proc.p_stats);
 235                                 return (-1);
 236                         }
 237                         kp->ki_start = pstats.p_start;
 238
 239                         /*
 240                          * XXX: The times here are probably zero and need
 241                          * to be calculated from the raw data in p_rux and
 242                          * p_crux.
 243                          */
 244                         kp->ki_rusage = pstats.p_ru;
 245                         kp->ki_childstime = pstats.p_cru.ru_stime;
 246                         kp->ki_childutime = pstats.p_cru.ru_utime;
 247                         /* Some callers want child-times in a single value */
 248                         timeradd(&kp->ki_childstime, &kp->ki_childutime,
 249                             &kp->ki_childtime);
 250                 }
 251 #endif
 252                 if (proc.p_oppid)
 253                         kp->ki_ppid = proc.p_oppid;
 254                 else if (proc.p_pptr) {
 255                         if (KREAD(kd, (u_long)proc.p_pptr, &pproc)) {
 256                                 _kvm_err(kd, kd->program,
 257                                     "can't read pproc at %p", proc.p_pptr);
 258                                 return (-1);
 259                         }
 260                         kp->ki_ppid = pproc.p_pid;
 261                 } else
 262                         kp->ki_ppid = 0;
 263                 if (proc.p_pgrp == NULL)
 264                         goto nopgrp;
 265                 if (KREAD(kd, (u_long)proc.p_pgrp, &pgrp)) {
 266                         _kvm_err(kd, kd->program, "can't read pgrp at %p",
 267                                  proc.p_pgrp);
 268                         return (-1);
 269                 }
 270                 kp->ki_pgid = pgrp.pg_id;
 271                 kp->ki_jobc = -1;       /* Or calculate?  Arguably not. */
 272                 if (KREAD(kd, (u_long)pgrp.pg_session, &sess)) {
 273                         _kvm_err(kd, kd->program, "can't read session at %p",
 274                                 pgrp.pg_session);
 275                         return (-1);
 276                 }
 277                 kp->ki_sid = sess.s_sid;
 278                 (void)memcpy(kp->ki_login, sess.s_login,
 279                                                 sizeof(kp->ki_login));
 280                 if ((proc.p_flag & P_CONTROLT) && sess.s_ttyp != NULL) {
 281                         if (KREAD(kd, (u_long)sess.s_ttyp, &tty)) {
 282                                 _kvm_err(kd, kd->program,
 283                                          "can't read tty at %p", sess.s_ttyp);
 284                                 return (-1);
 285                         }
 286                         if (tty.t_dev != NULL) {
 287                                 if (KREAD(kd, (u_long)tty.t_dev, &t_cdev)) {
 288                                         _kvm_err(kd, kd->program,
 289                                                  "can't read cdev at %p",
 290                                                 tty.t_dev);
 291                                         return (-1);
 292                                 }
 293 #if 0
 294                                 kp->ki_tdev = t_cdev.si_udev;
 295 #else
 296                                 kp->ki_tdev = NODEV;
 297 #endif
 298                         }
 299                         if (tty.t_pgrp != NULL) {
 300                                 if (KREAD(kd, (u_long)tty.t_pgrp, &pgrp)) {
 301                                         _kvm_err(kd, kd->program,
 302                                                  "can't read tpgrp at %p",
 303                                                 tty.t_pgrp);
 304                                         return (-1);
 305                                 }
 306                                 kp->ki_tpgid = pgrp.pg_id;
 307                         } else
 308                                 kp->ki_tpgid = -1;
 309                         if (tty.t_session != NULL) {
 310                                 if (KREAD(kd, (u_long)tty.t_session, &sess)) {
 311                                         _kvm_err(kd, kd->program,
 312                                             "can't read session at %p",
 313                                             tty.t_session);
 314                                         return (-1);
 315                                 }
 316                                 kp->ki_tsid = sess.s_sid;
 317                         }
 318                 } else {
 319 nopgrp:
 320                         kp->ki_tdev = NODEV;
 321                 }
 322
 323                 (void)kvm_read(kd, (u_long)proc.p_vmspace,
 324                     (char *)&vmspace, sizeof(vmspace));
 325                 kp->ki_size = vmspace.vm_map.size;
 326                 /*
 327                  * Approximate the kernel's method of calculating
 328                  * this field.
 329                  */
 330 #define         pmap_resident_count(pm) ((pm)->pm_stats.resident_count)
 331                 kp->ki_rssize = pmap_resident_count(&vmspace.vm_pmap);
 332                 kp->ki_swrss = vmspace.vm_swrss;
 333                 kp->ki_tsize = vmspace.vm_tsize;
 334                 kp->ki_dsize = vmspace.vm_dsize;
 335                 kp->ki_ssize = vmspace.vm_ssize;
 336
 337                 switch (what & ~KERN_PROC_INC_THREAD) {
 338
 339                 case KERN_PROC_PGRP:
 340                         if (kp->ki_pgid != (pid_t)arg)
 341                                 continue;
 342                         break;
 343
 344                 case KERN_PROC_SESSION:
 345                         if (kp->ki_sid != (pid_t)arg)
 346                                 continue;
 347                         break;
 348
 349                 case KERN_PROC_TTY:
 350                         if ((proc.p_flag & P_CONTROLT) == 0 ||
 351                              kp->ki_tdev != (dev_t)arg)
 352                                 continue;
 353                         break;
 354                 }
 355                 if (proc.p_comm[0] != 0)
 356                         strlcpy(kp->ki_comm, proc.p_comm, MAXCOMLEN);
 357                 (void)kvm_read(kd, (u_long)proc.p_sysent, (char *)&sysent,
 358                     sizeof(sysent));
 359                 (void)kvm_read(kd, (u_long)sysent.sv_name, (char *)&svname,
 360                     sizeof(svname));
 361                 if (svname[0] != 0)
 362                         strlcpy(kp->ki_emul, svname, KI_EMULNAMELEN);
 363                 kp->ki_runtime = cputick2usec(proc.p_rux.rux_runtime);
 364                 kp->ki_pid = proc.p_pid;
 365                 kp->ki_xstat = KW_EXITCODE(proc.p_xexit, proc.p_xsig);
 366                 kp->ki_acflag = proc.p_acflag;
 367                 kp->ki_lock = proc.p_lock;
 368                 kp->ki_tdev_freebsd11 = kp->ki_tdev; /* truncate */
 369
 370                 /* Per-thread items; iterate as appropriate. */
 371                 td = TAILQ_FIRST(&proc.p_threads);
 372                 for (first_thread = true; cnt < maxcnt && td != NULL &&
 373                     (first_thread || (what & KERN_PROC_INC_THREAD));
 374                     first_thread = false) {
 375                         if (proc.p_state != PRS_ZOMBIE) {
 376                                 if (KREAD(kd, (u_long)td, &mtd)) {
 377                                         _kvm_err(kd, kd->program,
 378                                             "can't read thread at %p", td);
 379                                         return (-1);
 380                                 }
 381                                 if (what & KERN_PROC_INC_THREAD)
 382                                         td = TAILQ_NEXT(&mtd, td_plist);
 383                         } else
 384                                 td = NULL;
 385                         if ((proc.p_state != PRS_ZOMBIE) && mtd.td_wmesg)
 386                                 (void)kvm_read(kd, (u_long)mtd.td_wmesg,
 387                                     kp->ki_wmesg, WMESGLEN);
 388                         else
 389                                 memset(kp->ki_wmesg, 0, WMESGLEN);
 390                         if (proc.p_pgrp == NULL) {
 391                                 kp->ki_kiflag = 0;
 392                         } else {
 393                                 kp->ki_kiflag = sess.s_ttyvp ? KI_CTTY : 0;
 394                                 if (sess.s_leader == p)
 395                                         kp->ki_kiflag |= KI_SLEADER;
 396                         }
 397                         if ((proc.p_state != PRS_ZOMBIE) &&
 398                             (mtd.td_blocked != 0)) {
 399                                 kp->ki_kiflag |= KI_LOCKBLOCK;
 400                                 if (mtd.td_lockname)
 401                                         (void)kvm_read(kd,
 402                                             (u_long)mtd.td_lockname,
 403                                             kp->ki_lockname, LOCKNAMELEN);
 404                                 else
 405                                         memset(kp->ki_lockname, 0,
 406                                             LOCKNAMELEN);
 407                                 kp->ki_lockname[LOCKNAMELEN] = 0;
 408                         } else
 409                                 kp->ki_kiflag &= ~KI_LOCKBLOCK;
 410                         kp->ki_siglist = proc.p_siglist;
 411                         if (proc.p_state != PRS_ZOMBIE) {
 412                                 SIGSETOR(kp->ki_siglist, mtd.td_siglist);
 413                                 kp->ki_sigmask = mtd.td_sigmask;
 414                                 kp->ki_swtime = (ticks - proc.p_swtick) / hz;
 415                                 kp->ki_flag = proc.p_flag;
 416                                 kp->ki_sflag = 0;
 417                                 kp->ki_nice = proc.p_nice;
 418                                 kp->ki_traceflag = proc.p_traceflag;
 419                                 if (proc.p_state == PRS_NORMAL) {
 420                                         if (TD_ON_RUNQ(&mtd) ||
 421                                             TD_CAN_RUN(&mtd) ||
 422                                             TD_IS_RUNNING(&mtd)) {
 423                                                 kp->ki_stat = SRUN;
 424                                         } else if (TD_GET_STATE(&mtd) ==
 425                                             TDS_INHIBITED) {
 426                                                 if (P_SHOULDSTOP(&proc)) {
 427                                                         kp->ki_stat = SSTOP;
 428                                                 } else if (
 429                                                     TD_IS_SLEEPING(&mtd)) {
 430                                                         kp->ki_stat = SSLEEP;
 431                                                 } else if (TD_ON_LOCK(&mtd)) {
 432                                                         kp->ki_stat = SLOCK;
 433                                                 } else {
 434                                                         kp->ki_stat = SWAIT;
 435                                                 }
 436                                         }
 437                                 } else {
 438                                         kp->ki_stat = SIDL;
 439                                 }
 440                                 /* Stuff from the thread */
 441                                 kp->ki_pri.pri_level = mtd.td_priority;
 442                                 kp->ki_pri.pri_native = mtd.td_base_pri;
 443                                 kp->ki_lastcpu = mtd.td_lastcpu;
 444                                 kp->ki_wchan = mtd.td_wchan;
 445                                 kp->ki_oncpu = mtd.td_oncpu;
 446                                 if (mtd.td_name[0] != '\0')
 447                                         strlcpy(kp->ki_tdname, mtd.td_name,
 448                                             sizeof(kp->ki_tdname));
 449                                 else
 450                                         memset(kp->ki_tdname, 0,
 451                                             sizeof(kp->ki_tdname));
 452                                 kp->ki_pctcpu = 0;
 453                                 kp->ki_rqindex = 0;
 454
 455                                 /*
 456                                  * Note: legacy fields; wraps at NO_CPU_OLD
 457                                  * or the old max CPU value as appropriate
 458                                  */
 459                                 if (mtd.td_lastcpu == NOCPU)
 460                                         kp->ki_lastcpu_old = NOCPU_OLD;
 461                                 else if (mtd.td_lastcpu > MAXCPU_OLD)
 462                                         kp->ki_lastcpu_old = MAXCPU_OLD;
 463                                 else
 464                                         kp->ki_lastcpu_old = mtd.td_lastcpu;
 465
 466                                 if (mtd.td_oncpu == NOCPU)
 467                                         kp->ki_oncpu_old = NOCPU_OLD;
 468                                 else if (mtd.td_oncpu > MAXCPU_OLD)
 469                                         kp->ki_oncpu_old = MAXCPU_OLD;
 470                                 else
 471                                         kp->ki_oncpu_old = mtd.td_oncpu;
 472                                 kp->ki_tid = mtd.td_tid;
 473                         } else {
 474                                 memset(&kp->ki_sigmask, 0,
 475                                     sizeof(kp->ki_sigmask));
 476                                 kp->ki_stat = SZOMB;
 477                                 kp->ki_tid = 0;
 478                         }
 479
 480                         bcopy(&kinfo_proc, bp, sizeof(kinfo_proc));
 481                         ++bp;
 482                         ++cnt;
 483                 }
 484         }
 485         return (cnt);
 486 }
 487
 488 /*
 489  * Build proc info array by reading in proc list from a crash dump.
 490  * Return number of procs read.  maxcnt is the max we will read.
 491  */
 492 static int
 493 kvm_deadprocs(kvm_t *kd, int what, int arg, u_long a_allproc,
 494     u_long a_zombproc, int maxcnt)
 495 {
 496         struct kinfo_proc *bp = kd->procbase;
 497         int acnt, zcnt = 0;
 498         struct proc *p;
 499
 500         if (KREAD(kd, a_allproc, &p)) {
 501                 _kvm_err(kd, kd->program, "cannot read allproc");
 502                 return (-1);
 503         }
 504         acnt = kvm_proclist(kd, what, arg, p, bp, maxcnt);
 505         if (acnt < 0)
 506                 return (acnt);
 507
 508         if (a_zombproc != 0) {
 509                 if (KREAD(kd, a_zombproc, &p)) {
 510                         _kvm_err(kd, kd->program, "cannot read zombproc");
 511                         return (-1);
 512                 }
 513                 zcnt = kvm_proclist(kd, what, arg, p, bp + acnt, maxcnt - acnt);
 514                 if (zcnt < 0)
 515                         zcnt = 0;
 516         }
 517
 518         return (acnt + zcnt);
 519 }
 520
 521 struct kinfo_proc *
 522 kvm_getprocs(kvm_t *kd, int op, int arg, int *cnt)
 523 {
 524         int mib[4], st, nprocs;
 525         size_t size, osize;
 526         int temp_op;
 527
 528         if (kd->procbase != 0) {
 529                 free((void *)kd->procbase);
 530                 /*
 531                  * Clear this pointer in case this call fails.  Otherwise,
 532                  * kvm_close() will free it again.
 533                  */
 534                 kd->procbase = 0;
 535         }
 536         if (ISALIVE(kd)) {
 537                 size = 0;
 538                 mib[0] = CTL_KERN;
 539                 mib[1] = KERN_PROC;
 540                 mib[2] = op;
 541                 mib[3] = arg;
 542                 temp_op = op & ~KERN_PROC_INC_THREAD;
 543                 st = sysctl(mib,
 544                     temp_op == KERN_PROC_ALL || temp_op == KERN_PROC_PROC ?
 545                     3 : 4, NULL, &size, NULL, 0);
 546                 if (st == -1) {
 547                         _kvm_syserr(kd, kd->program, "kvm_getprocs");
 548                         return (0);
 549                 }
 550                 /*
 551                  * We can't continue with a size of 0 because we pass
 552                  * it to realloc() (via _kvm_realloc()), and passing 0
 553                  * to realloc() results in undefined behavior.
 554                  */
 555                 if (size == 0) {
 556                         /*
 557                          * XXX: We should probably return an invalid,
 558                          * but non-NULL, pointer here so any client
 559                          * program trying to dereference it will
 560                          * crash.  However, _kvm_freeprocs() calls
 561                          * free() on kd->procbase if it isn't NULL,
 562                          * and free()'ing a junk pointer isn't good.
 563                          * Then again, _kvm_freeprocs() isn't used
 564                          * anywhere . . .
 565                          */
 566                         kd->procbase = _kvm_malloc(kd, 1);
 567                         goto liveout;
 568                 }
 569                 do {
 570                         size += size / 10;
 571                         kd->procbase = (struct kinfo_proc *)
 572                             _kvm_realloc(kd, kd->procbase, size);
 573                         if (kd->procbase == NULL)
 574                                 return (0);
 575                         osize = size;
 576                         st = sysctl(mib, temp_op == KERN_PROC_ALL ||
 577                             temp_op == KERN_PROC_PROC ? 3 : 4,
 578                             kd->procbase, &size, NULL, 0);
 579                 } while (st == -1 && errno == ENOMEM && size == osize);
 580                 if (st == -1) {
 581                         _kvm_syserr(kd, kd->program, "kvm_getprocs");
 582                         return (0);
 583                 }
 584                 /*
 585                  * We have to check the size again because sysctl()
 586                  * may "round up" oldlenp if oldp is NULL; hence it
 587                  * might've told us that there was data to get when
 588                  * there really isn't any.
 589                  */
 590                 if (size > 0 &&
 591                     kd->procbase->ki_structsize != sizeof(struct kinfo_proc)) {
 592                         _kvm_err(kd, kd->program,
 593                             "kinfo_proc size mismatch (expected %zu, got %d)",
 594                             sizeof(struct kinfo_proc),
 595                             kd->procbase->ki_structsize);
 596                         return (0);
 597                 }
 598 liveout:
 599                 nprocs = size == 0 ? 0 : size / kd->procbase->ki_structsize;
 600         } else {
 601                 struct nlist nl[6], *p;
 602                 struct nlist nlz[2];
 603
 604                 nl[0].n_name = "_nprocs";
 605                 nl[1].n_name = "_allproc";
 606                 nl[2].n_name = "_ticks";
 607                 nl[3].n_name = "_hz";
 608                 nl[4].n_name = "_cpu_tick_frequency";
 609                 nl[5].n_name = 0;
 610
 611                 nlz[0].n_name = "_zombproc";
 612                 nlz[1].n_name = 0;
 613
 614                 if (!kd->arch->ka_native(kd)) {
 615                         _kvm_err(kd, kd->program,
 616                             "cannot read procs from non-native core");
 617                         return (0);
 618                 }
 619
 620                 if (kvm_nlist(kd, nl) != 0) {
 621                         for (p = nl; p->n_type != 0; ++p)
 622                                 ;
 623                         _kvm_err(kd, kd->program,
 624                                  "%s: no such symbol", p->n_name);
 625                         return (0);
 626                 }
 627                 (void) kvm_nlist(kd, nlz);      /* attempt to get zombproc */
 628                 if (KREAD(kd, nl[0].n_value, &nprocs)) {
 629                         _kvm_err(kd, kd->program, "can't read nprocs");
 630                         return (0);
 631                 }
 632                 /*
 633                  * If returning all threads, we don't know how many that
 634                  * might be.  Presume that there are, on average, no more
 635                  * than 10 threads per process.
 636                  */
 637                 if (op == KERN_PROC_ALL || (op & KERN_PROC_INC_THREAD))
 638                         nprocs *= 10;           /* XXX */
 639                 if (KREAD(kd, nl[2].n_value, &ticks)) {
 640                         _kvm_err(kd, kd->program, "can't read ticks");
 641                         return (0);
 642                 }
 643                 if (KREAD(kd, nl[3].n_value, &hz)) {
 644                         _kvm_err(kd, kd->program, "can't read hz");
 645                         return (0);
 646                 }
 647                 if (KREAD(kd, nl[4].n_value, &cpu_tick_frequency)) {
 648                         _kvm_err(kd, kd->program,
 649                             "can't read cpu_tick_frequency");
 650                         return (0);
 651                 }
 652                 size = nprocs * sizeof(struct kinfo_proc);
 653                 kd->procbase = (struct kinfo_proc *)_kvm_malloc(kd, size);
 654                 if (kd->procbase == NULL)
 655                         return (0);
 656
 657                 nprocs = kvm_deadprocs(kd, op, arg, nl[1].n_value,
 658                                       nlz[0].n_value, nprocs);
 659                 if (nprocs <= 0) {
 660                         _kvm_freeprocs(kd);
 661                         nprocs = 0;
 662                 }
 663 #ifdef notdef
 664                 else {
 665                         size = nprocs * sizeof(struct kinfo_proc);
 666                         kd->procbase = realloc(kd->procbase, size);
 667                 }
 668 #endif
 669         }
 670         *cnt = nprocs;
 671         return (kd->procbase);
 672 }
 673
 674 void
 675 _kvm_freeprocs(kvm_t *kd)
 676 {
 677
 678         free(kd->procbase);
 679         kd->procbase = NULL;
 680 }
 681
 682 void *
 683 _kvm_realloc(kvm_t *kd, void *p, size_t n)
 684 {
 685         void *np;
 686
 687         np = reallocf(p, n);
 688         if (np == NULL)
 689                 _kvm_err(kd, kd->program, "out of memory");
 690         return (np);
 691 }
 692
 693 /*
 694  * Get the command args or environment.
 695  */
 696 static char **
 697 kvm_argv(kvm_t *kd, const struct kinfo_proc *kp, int env, int nchr)
 698 {
 699         int oid[4];
 700         int i;
 701         size_t bufsz;
 702         static int buflen;
 703         static char *buf, *p;
 704         static char **bufp;
 705         static int argc;
 706         char **nbufp;
 707
 708         if (!ISALIVE(kd)) {
 709                 _kvm_err(kd, kd->program,
 710                     "cannot read user space from dead kernel");
 711                 return (NULL);
 712         }
 713
 714         if (nchr == 0 || nchr > ARG_MAX)
 715                 nchr = ARG_MAX;
 716         if (buflen == 0) {
 717                 buf = malloc(nchr);
 718                 if (buf == NULL) {
 719                         _kvm_err(kd, kd->program, "cannot allocate memory");
 720                         return (NULL);
 721                 }
 722                 argc = 32;
 723                 bufp = malloc(sizeof(char *) * argc);
 724                 if (bufp == NULL) {
 725                         free(buf);
 726                         buf = NULL;
 727                         _kvm_err(kd, kd->program, "cannot allocate memory");
 728                         return (NULL);
 729                 }
 730                 buflen = nchr;
 731         } else if (nchr > buflen) {
 732                 p = realloc(buf, nchr);
 733                 if (p != NULL) {
 734                         buf = p;
 735                         buflen = nchr;
 736                 }
 737         }
 738         oid[0] = CTL_KERN;
 739         oid[1] = KERN_PROC;
 740         oid[2] = env ? KERN_PROC_ENV : KERN_PROC_ARGS;
 741         oid[3] = kp->ki_pid;
 742         bufsz = buflen;
 743         if (sysctl(oid, 4, buf, &bufsz, 0, 0) == -1) {
 744                 /*
 745                  * If the supplied buf is too short to hold the requested
 746                  * value the sysctl returns with ENOMEM. The buf is filled
 747                  * with the truncated value and the returned bufsz is equal
 748                  * to the requested len.
 749                  */
 750                 if (errno != ENOMEM || bufsz != (size_t)buflen)
 751                         return (NULL);
 752                 buf[bufsz - 1] = '\0';
 753                 errno = 0;
 754         } else if (bufsz == 0)
 755                 return (NULL);
 756         i = 0;
 757         p = buf;
 758         do {
 759                 bufp[i++] = p;
 760                 p += strlen(p) + 1;
 761                 if (i >= argc) {
 762                         argc += argc;
 763                         nbufp = realloc(bufp, sizeof(char *) * argc);
 764                         if (nbufp == NULL)
 765                                 return (NULL);
 766                         bufp = nbufp;
 767                 }
 768         } while (p < buf + bufsz);
 769         bufp[i++] = 0;
 770         return (bufp);
 771 }
 772
 773 char **
 774 kvm_getargv(kvm_t *kd, const struct kinfo_proc *kp, int nchr)
 775 {
 776         return (kvm_argv(kd, kp, 0, nchr));
 777 }
 778
 779 char **
 780 kvm_getenvv(kvm_t *kd, const struct kinfo_proc *kp, int nchr)
 781 {
 782         return (kvm_argv(kd, kp, 1, nchr));
 783 }