bin/pkill/pkill.c

   1 /*      $NetBSD: pkill.c,v 1.16 2005/10/10 22:13:20 kleink Exp $        */
   2
   3 /*-
   4  * Copyright (c) 2002 The NetBSD Foundation, Inc.
   5  * Copyright (c) 2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
   6  * All rights reserved.
   7  *
   8  * This code is derived from software contributed to The NetBSD Foundation
   9  * by Andrew Doran.
  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  *
  20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  30  * POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <sys/types.h>
  37 #include <sys/param.h>
  38 #include <sys/sysctl.h>
  39 #include <sys/proc.h>
  40 #include <sys/queue.h>
  41 #include <sys/stat.h>
  42 #include <sys/time.h>
  43 #include <sys/user.h>
  44
  45 #include <assert.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <limits.h>
  49 #include <paths.h>
  50 #include <string.h>
  51 #include <unistd.h>
  52 #include <signal.h>
  53 #include <regex.h>
  54 #include <ctype.h>
  55 #include <fcntl.h>
  56 #include <kvm.h>
  57 #include <err.h>
  58 #include <pwd.h>
  59 #include <grp.h>
  60 #include <errno.h>
  61 #include <locale.h>
  62
  63 #define STATUS_MATCH    0
  64 #define STATUS_NOMATCH  1
  65 #define STATUS_BADUSAGE 2
  66 #define STATUS_ERROR    3
  67
  68 #define MIN_PID 5
  69 #define MAX_PID 99999
  70
  71 /* Ignore system-processes (if '-S' flag is not specified) and myself. */
  72 #define PSKIP(kp)       ((kp)->ki_pid == mypid ||                       \
  73                          (!kthreads && ((kp)->ki_flag & P_KTHREAD) != 0))
  74
  75 enum listtype {
  76         LT_GENERIC,
  77         LT_USER,
  78         LT_GROUP,
  79         LT_TTY,
  80         LT_PGRP,
  81         LT_JID,
  82         LT_SID,
  83         LT_CLASS
  84 };
  85
  86 struct list {
  87         SLIST_ENTRY(list) li_chain;
  88         long    li_number;
  89         char    *li_name;
  90 };
  91
  92 SLIST_HEAD(listhead, list);
  93
  94 static struct kinfo_proc *plist;
  95 static char     *selected;
  96 static const char *delim = "\n";
  97 static int      nproc;
  98 static int      pgrep;
  99 static int      signum = SIGTERM;
 100 static int      newest;
 101 static int      oldest;
 102 static int      interactive;
 103 static int      inverse;
 104 static int      longfmt;
 105 static int      matchargs;
 106 static int      fullmatch;
 107 static int      kthreads;
 108 static int      cflags = REG_EXTENDED;
 109 static int      quiet;
 110 static kvm_t    *kd;
 111 static pid_t    mypid;
 112
 113 static struct listhead euidlist = SLIST_HEAD_INITIALIZER(euidlist);
 114 static struct listhead ruidlist = SLIST_HEAD_INITIALIZER(ruidlist);
 115 static struct listhead rgidlist = SLIST_HEAD_INITIALIZER(rgidlist);
 116 static struct listhead pgrplist = SLIST_HEAD_INITIALIZER(pgrplist);
 117 static struct listhead ppidlist = SLIST_HEAD_INITIALIZER(ppidlist);
 118 static struct listhead tdevlist = SLIST_HEAD_INITIALIZER(tdevlist);
 119 static struct listhead sidlist = SLIST_HEAD_INITIALIZER(sidlist);
 120 static struct listhead jidlist = SLIST_HEAD_INITIALIZER(jidlist);
 121 static struct listhead classlist = SLIST_HEAD_INITIALIZER(classlist);
 122
 123 static void     usage(void) __attribute__((__noreturn__));
 124 static int      killact(const struct kinfo_proc *);
 125 static int      grepact(const struct kinfo_proc *);
 126 static void     makelist(struct listhead *, enum listtype, char *);
 127 static int      takepid(const char *, int);
 128
 129 int
 130 main(int argc, char **argv)
 131 {
 132         char buf[_POSIX2_LINE_MAX], *mstr, **pargv, *p, *q, *pidfile;
 133         const char *execf, *coref;
 134         int ancestors, debug_opt, did_action;
 135         int i, ch, bestidx, rv, criteria, pidfromfile, pidfilelock;
 136         size_t jsz;
 137         int (*action)(const struct kinfo_proc *);
 138         struct kinfo_proc *kp;
 139         struct list *li;
 140         struct timeval best_tval;
 141         regex_t reg;
 142         regmatch_t regmatch;
 143         pid_t pid;
 144
 145         setlocale(LC_ALL, "");
 146
 147         if (strcmp(getprogname(), "pgrep") == 0) {
 148                 action = grepact;
 149                 pgrep = 1;
 150         } else {
 151                 action = killact;
 152                 p = argv[1];
 153
 154                 if (argc > 1 && p[0] == '-') {
 155                         p++;
 156                         i = (int)strtol(p, &q, 10);
 157                         if (*q == '\0') {
 158                                 signum = i;
 159                                 argv++;
 160                                 argc--;
 161                         } else {
 162                                 if (strncasecmp(p, "SIG", 3) == 0)
 163                                         p += 3;
 164                                 for (i = 1; i < NSIG; i++)
 165                                         if (strcasecmp(sys_signame[i], p) == 0)
 166                                                 break;
 167                                 if (i != NSIG) {
 168                                         signum = i;
 169                                         argv++;
 170                                         argc--;
 171                                 }
 172                         }
 173                 }
 174         }
 175
 176         ancestors = 0;
 177         criteria = 0;
 178         debug_opt = 0;
 179         pidfile = NULL;
 180         pidfilelock = 0;
 181         quiet = 0;
 182         execf = NULL;
 183         coref = _PATH_DEVNULL;
 184
 185         while ((ch = getopt(argc, argv, "DF:G:ILM:N:P:SU:ac:d:fg:ij:lnoqs:t:u:vx")) != -1)
 186                 switch (ch) {
 187                 case 'D':
 188                         debug_opt++;
 189                         break;
 190                 case 'F':
 191                         pidfile = optarg;
 192                         criteria = 1;
 193                         break;
 194                 case 'G':
 195                         makelist(&rgidlist, LT_GROUP, optarg);
 196                         criteria = 1;
 197                         break;
 198                 case 'I':
 199                         if (pgrep)
 200                                 usage();
 201                         interactive = 1;
 202                         break;
 203                 case 'L':
 204                         pidfilelock = 1;
 205                         break;
 206                 case 'M':
 207                         coref = optarg;
 208                         break;
 209                 case 'N':
 210                         execf = optarg;
 211                         break;
 212                 case 'P':
 213                         makelist(&ppidlist, LT_GENERIC, optarg);
 214                         criteria = 1;
 215                         break;
 216                 case 'S':
 217                         if (!pgrep)
 218                                 usage();
 219                         kthreads = 1;
 220                         break;
 221                 case 'U':
 222                         makelist(&ruidlist, LT_USER, optarg);
 223                         criteria = 1;
 224                         break;
 225                 case 'a':
 226                         ancestors++;
 227                         break;
 228                 case 'c':
 229                         makelist(&classlist, LT_CLASS, optarg);
 230                         criteria = 1;
 231                         break;
 232                 case 'd':
 233                         if (!pgrep)
 234                                 usage();
 235                         delim = optarg;
 236                         break;
 237                 case 'f':
 238                         matchargs = 1;
 239                         break;
 240                 case 'g':
 241                         makelist(&pgrplist, LT_PGRP, optarg);
 242                         criteria = 1;
 243                         break;
 244                 case 'i':
 245                         cflags |= REG_ICASE;
 246                         break;
 247                 case 'j':
 248                         makelist(&jidlist, LT_JID, optarg);
 249                         criteria = 1;
 250                         break;
 251                 case 'l':
 252                         longfmt = 1;
 253                         break;
 254                 case 'n':
 255                         newest = 1;
 256                         criteria = 1;
 257                         break;
 258                 case 'o':
 259                         oldest = 1;
 260                         criteria = 1;
 261                         break;
 262                 case 'q':
 263                         if (!pgrep)
 264                                 usage();
 265                         quiet = 1;
 266                         break;
 267                 case 's':
 268                         makelist(&sidlist, LT_SID, optarg);
 269                         criteria = 1;
 270                         break;
 271                 case 't':
 272                         makelist(&tdevlist, LT_TTY, optarg);
 273                         criteria = 1;
 274                         break;
 275                 case 'u':
 276                         makelist(&euidlist, LT_USER, optarg);
 277                         criteria = 1;
 278                         break;
 279                 case 'v':
 280                         inverse = 1;
 281                         break;
 282                 case 'x':
 283                         fullmatch = 1;
 284                         break;
 285                 default:
 286                         usage();
 287                         /* NOTREACHED */
 288                 }
 289
 290         argc -= optind;
 291         argv += optind;
 292         if (argc != 0)
 293                 criteria = 1;
 294         if (!criteria)
 295                 usage();
 296         if (newest && oldest)
 297                 errx(STATUS_ERROR, "Options -n and -o are mutually exclusive");
 298         if (pidfile != NULL)
 299                 pidfromfile = takepid(pidfile, pidfilelock);
 300         else {
 301                 if (pidfilelock) {
 302                         errx(STATUS_ERROR,
 303                             "Option -L doesn't make sense without -F");
 304                 }
 305                 pidfromfile = -1;
 306         }
 307
 308         mypid = getpid();
 309
 310         /*
 311          * Retrieve the list of running processes from the kernel.
 312          */
 313         kd = kvm_openfiles(execf, coref, NULL, O_RDONLY, buf);
 314         if (kd == NULL)
 315                 errx(STATUS_ERROR, "Cannot open kernel files (%s)", buf);
 316
 317         /*
 318          * Use KERN_PROC_PROC instead of KERN_PROC_ALL, since we
 319          * just want processes and not individual kernel threads.
 320          */
 321         plist = kvm_getprocs(kd, KERN_PROC_PROC, 0, &nproc);
 322         if (plist == NULL) {
 323                 errx(STATUS_ERROR, "Cannot get process list (%s)",
 324                     kvm_geterr(kd));
 325         }
 326
 327         /*
 328          * Allocate memory which will be used to keep track of the
 329          * selection.
 330          */
 331         if ((selected = malloc(nproc)) == NULL) {
 332                 err(STATUS_ERROR, "Cannot allocate memory for %d processes",
 333                     nproc);
 334         }
 335         memset(selected, 0, nproc);
 336
 337         /*
 338          * Refine the selection.
 339          */
 340         for (; *argv != NULL; argv++) {
 341                 if ((rv = regcomp(&reg, *argv, cflags)) != 0) {
 342                         regerror(rv, &reg, buf, sizeof(buf));
 343                         errx(STATUS_BADUSAGE,
 344                             "Cannot compile regular expression `%s' (%s)",
 345                             *argv, buf);
 346                 }
 347
 348                 for (i = 0, kp = plist; i < nproc; i++, kp++) {
 349                         if (PSKIP(kp)) {
 350                                 if (debug_opt > 0)
 351                                     fprintf(stderr, "* Skipped %5d %3d %s\n",
 352                                         kp->ki_pid, kp->ki_uid, kp->ki_comm);
 353                                 continue;
 354                         }
 355
 356                         if (matchargs &&
 357                             (pargv = kvm_getargv(kd, kp, 0)) != NULL) {
 358                                 jsz = 0;
 359                                 while (jsz < sizeof(buf) && *pargv != NULL) {
 360                                         jsz += snprintf(buf + jsz,
 361                                             sizeof(buf) - jsz,
 362                                             pargv[1] != NULL ? "%s " : "%s",
 363                                             pargv[0]);
 364                                         pargv++;
 365                                 }
 366                                 mstr = buf;
 367                         } else
 368                                 mstr = kp->ki_comm;
 369
 370                         rv = regexec(&reg, mstr, 1, &regmatch, 0);
 371                         if (rv == 0) {
 372                                 if (fullmatch) {
 373                                         if (regmatch.rm_so == 0 &&
 374                                             regmatch.rm_eo ==
 375                                             (off_t)strlen(mstr))
 376                                                 selected[i] = 1;
 377                                 } else
 378                                         selected[i] = 1;
 379                         } else if (rv != REG_NOMATCH) {
 380                                 regerror(rv, &reg, buf, sizeof(buf));
 381                                 errx(STATUS_ERROR,
 382                                     "Regular expression evaluation error (%s)",
 383                                     buf);
 384                         }
 385                         if (debug_opt > 1) {
 386                                 const char *rv_res = "NoMatch";
 387                                 if (selected[i])
 388                                         rv_res = "Matched";
 389                                 fprintf(stderr, "* %s %5d %3d %s\n", rv_res,
 390                                     kp->ki_pid, kp->ki_uid, mstr);
 391                         }
 392                 }
 393
 394                 regfree(&reg);
 395         }
 396
 397         for (i = 0, kp = plist; i < nproc; i++, kp++) {
 398                 if (PSKIP(kp))
 399                         continue;
 400
 401                 if (pidfromfile >= 0 && kp->ki_pid != pidfromfile) {
 402                         selected[i] = 0;
 403                         continue;
 404                 }
 405
 406                 SLIST_FOREACH(li, &ruidlist, li_chain)
 407                         if (kp->ki_ruid == (uid_t)li->li_number)
 408                                 break;
 409                 if (SLIST_FIRST(&ruidlist) != NULL && li == NULL) {
 410                         selected[i] = 0;
 411                         continue;
 412                 }
 413
 414                 SLIST_FOREACH(li, &rgidlist, li_chain)
 415                         if (kp->ki_rgid == (gid_t)li->li_number)
 416                                 break;
 417                 if (SLIST_FIRST(&rgidlist) != NULL && li == NULL) {
 418                         selected[i] = 0;
 419                         continue;
 420                 }
 421
 422                 SLIST_FOREACH(li, &euidlist, li_chain)
 423                         if (kp->ki_uid == (uid_t)li->li_number)
 424                                 break;
 425                 if (SLIST_FIRST(&euidlist) != NULL && li == NULL) {
 426                         selected[i] = 0;
 427                         continue;
 428                 }
 429
 430                 SLIST_FOREACH(li, &ppidlist, li_chain)
 431                         if (kp->ki_ppid == (pid_t)li->li_number)
 432                                 break;
 433                 if (SLIST_FIRST(&ppidlist) != NULL && li == NULL) {
 434                         selected[i] = 0;
 435                         continue;
 436                 }
 437
 438                 SLIST_FOREACH(li, &pgrplist, li_chain)
 439                         if (kp->ki_pgid == (pid_t)li->li_number)
 440                                 break;
 441                 if (SLIST_FIRST(&pgrplist) != NULL && li == NULL) {
 442                         selected[i] = 0;
 443                         continue;
 444                 }
 445
 446                 SLIST_FOREACH(li, &tdevlist, li_chain) {
 447                         if (li->li_number == -1 &&
 448                             (kp->ki_flag & P_CONTROLT) == 0)
 449                                 break;
 450                         if (kp->ki_tdev == (dev_t)li->li_number)
 451                                 break;
 452                 }
 453                 if (SLIST_FIRST(&tdevlist) != NULL && li == NULL) {
 454                         selected[i] = 0;
 455                         continue;
 456                 }
 457
 458                 SLIST_FOREACH(li, &sidlist, li_chain)
 459                         if (kp->ki_sid == (pid_t)li->li_number)
 460                                 break;
 461                 if (SLIST_FIRST(&sidlist) != NULL && li == NULL) {
 462                         selected[i] = 0;
 463                         continue;
 464                 }
 465
 466                 SLIST_FOREACH(li, &jidlist, li_chain) {
 467                         /* A particular jail ID, including 0 (not in jail) */
 468                         if (kp->ki_jid == (int)li->li_number)
 469                                 break;
 470                         /* Any jail */
 471                         if (kp->ki_jid > 0 && li->li_number == -1)
 472                                 break;
 473                 }
 474                 if (SLIST_FIRST(&jidlist) != NULL && li == NULL) {
 475                         selected[i] = 0;
 476                         continue;
 477                 }
 478
 479                 SLIST_FOREACH(li, &classlist, li_chain) {
 480                         /*
 481                          * We skip P_SYSTEM processes to match ps(1) output.
 482                          */
 483                         if ((kp->ki_flag & P_SYSTEM) == 0 &&
 484                             strcmp(kp->ki_loginclass, li->li_name) == 0)
 485                                 break;
 486                 }
 487                 if (SLIST_FIRST(&classlist) != NULL && li == NULL) {
 488                         selected[i] = 0;
 489                         continue;
 490                 }
 491
 492                 if (argc == 0)
 493                         selected[i] = 1;
 494         }
 495
 496         if (!ancestors) {
 497                 pid = mypid;
 498                 while (pid) {
 499                         for (i = 0, kp = plist; i < nproc; i++, kp++) {
 500                                 if (PSKIP(kp))
 501                                         continue;
 502                                 if (kp->ki_pid == pid) {
 503                                         selected[i] = 0;
 504                                         pid = kp->ki_ppid;
 505                                         break;
 506                                 }
 507                         }
 508                         if (i == nproc) {
 509                                 if (pid == mypid)
 510                                         pid = getppid();
 511                                 else
 512                                         break;  /* Maybe we're in a jail ? */
 513                         }
 514                 }
 515         }
 516
 517         if (newest || oldest) {
 518                 best_tval.tv_sec = 0;
 519                 best_tval.tv_usec = 0;
 520                 bestidx = -1;
 521
 522                 for (i = 0, kp = plist; i < nproc; i++, kp++) {
 523                         if (!selected[i])
 524                                 continue;
 525                         if (bestidx == -1) {
 526                                 /* The first entry of the list which matched. */
 527                                 ;
 528                         } else if (timercmp(&kp->ki_start, &best_tval, >)) {
 529                                 /* This entry is newer than previous "best". */
 530                                 if (oldest)     /* but we want the oldest */
 531                                         continue;
 532                         } else {
 533                                 /* This entry is older than previous "best". */
 534                                 if (newest)     /* but we want the newest */
 535                                         continue;
 536                         }
 537                         /* This entry is better than previous "best" entry. */
 538                         best_tval.tv_sec = kp->ki_start.tv_sec;
 539                         best_tval.tv_usec = kp->ki_start.tv_usec;
 540                         bestidx = i;
 541                 }
 542
 543                 memset(selected, 0, nproc);
 544                 if (bestidx != -1)
 545                         selected[bestidx] = 1;
 546         }
 547
 548         /*
 549          * Take the appropriate action for each matched process, if any.
 550          */
 551         did_action = 0;
 552         for (i = 0, rv = 0, kp = plist; i < nproc; i++, kp++) {
 553                 if (PSKIP(kp))
 554                         continue;
 555                 if (selected[i]) {
 556                         if (longfmt && !pgrep) {
 557                                 did_action = 1;
 558                                 printf("kill -%d %d\n", signum, kp->ki_pid);
 559                         }
 560                         if (inverse)
 561                                 continue;
 562                 } else if (!inverse)
 563                         continue;
 564                 rv |= (*action)(kp);
 565         }
 566         if (!did_action && !pgrep && longfmt)
 567                 fprintf(stderr,
 568                     "No matching processes belonging to you were found\n");
 569
 570         exit(rv ? STATUS_MATCH : STATUS_NOMATCH);
 571 }
 572
 573 static void
 574 usage(void)
 575 {
 576         const char *ustr;
 577
 578         if (pgrep)
 579                 ustr = "[-LSfilnoqvx] [-d delim]";
 580         else
 581                 ustr = "[-signal] [-ILfilnovx]";
 582
 583         fprintf(stderr,
 584                 "usage: %s %s [-F pidfile] [-G gid] [-M core] [-N system]\n"
 585                 "             [-P ppid] [-U uid] [-c class] [-g pgrp] [-j jid]\n"
 586                 "             [-s sid] [-t tty] [-u euid] pattern ...\n",
 587                 getprogname(), ustr);
 588
 589         exit(STATUS_BADUSAGE);
 590 }
 591
 592 static void
 593 show_process(const struct kinfo_proc *kp)
 594 {
 595         char **argv;
 596
 597         if (quiet) {
 598                 assert(pgrep);
 599                 return;
 600         }
 601         if ((longfmt || !pgrep) && matchargs &&
 602             (argv = kvm_getargv(kd, kp, 0)) != NULL) {
 603                 printf("%d ", (int)kp->ki_pid);
 604                 for (; *argv != NULL; argv++) {
 605                         printf("%s", *argv);
 606                         if (argv[1] != NULL)
 607                                 putchar(' ');
 608                 }
 609         } else if (longfmt || !pgrep)
 610                 printf("%d %s", (int)kp->ki_pid, kp->ki_comm);
 611         else
 612                 printf("%d", (int)kp->ki_pid);
 613 }
 614
 615 static int
 616 killact(const struct kinfo_proc *kp)
 617 {
 618         int ch, first;
 619
 620         if (interactive) {
 621                 /*
 622                  * Be careful, ask before killing.
 623                  */
 624                 printf("kill ");
 625                 show_process(kp);
 626                 printf("? ");
 627                 fflush(stdout);
 628                 first = ch = getchar();
 629                 while (ch != '\n' && ch != EOF)
 630                         ch = getchar();
 631                 if (first != 'y' && first != 'Y')
 632                         return (1);
 633         }
 634         if (kill(kp->ki_pid, signum) == -1) {
 635                 /*
 636                  * Check for ESRCH, which indicates that the process
 637                  * disappeared between us matching it and us
 638                  * signalling it; don't issue a warning about it.
 639                  */
 640                 if (errno != ESRCH)
 641                         warn("signalling pid %d", (int)kp->ki_pid);
 642                 /*
 643                  * Return 0 to indicate that the process should not be
 644                  * considered a match, since we didn't actually get to
 645                  * signal it.
 646                  */
 647                 return (0);
 648         }
 649         return (1);
 650 }
 651
 652 static int
 653 grepact(const struct kinfo_proc *kp)
 654 {
 655
 656         show_process(kp);
 657         if (!quiet)
 658                 printf("%s", delim);
 659         return (1);
 660 }
 661
 662 static void
 663 makelist(struct listhead *head, enum listtype type, char *src)
 664 {
 665         struct list *li;
 666         struct passwd *pw;
 667         struct group *gr;
 668         struct stat st;
 669         const char *cp;
 670         char *sp, *ep, buf[MAXPATHLEN];
 671         int empty;
 672
 673         empty = 1;
 674
 675         while ((sp = strsep(&src, ",")) != NULL) {
 676                 if (*sp == '\0')
 677                         usage();
 678
 679                 if ((li = malloc(sizeof(*li))) == NULL) {
 680                         err(STATUS_ERROR, "Cannot allocate %zu bytes",
 681                             sizeof(*li));
 682                 }
 683
 684                 SLIST_INSERT_HEAD(head, li, li_chain);
 685                 empty = 0;
 686
 687                 if (type != LT_CLASS)
 688                         li->li_number = (uid_t)strtol(sp, &ep, 0);
 689
 690                 if (type != LT_CLASS && *ep == '\0') {
 691                         switch (type) {
 692                         case LT_PGRP:
 693                                 if (li->li_number == 0)
 694                                         li->li_number = getpgrp();
 695                                 break;
 696                         case LT_SID:
 697                                 if (li->li_number == 0)
 698                                         li->li_number = getsid(mypid);
 699                                 break;
 700                         case LT_JID:
 701                                 if (li->li_number < 0)
 702                                         errx(STATUS_BADUSAGE,
 703                                              "Negative jail ID `%s'", sp);
 704                                 /* For compatibility with old -j */
 705                                 if (li->li_number == 0)
 706                                         li->li_number = -1;     /* any jail */
 707                                 break;
 708                         case LT_TTY:
 709                                 if (li->li_number < 0)
 710                                         errx(STATUS_BADUSAGE,
 711                                              "Negative /dev/pts tty `%s'", sp);
 712                                 snprintf(buf, sizeof(buf), _PATH_DEV "pts/%s",
 713                                     sp);
 714                                 if (stat(buf, &st) != -1)
 715                                         goto foundtty;
 716                                 if (errno == ENOENT)
 717                                         errx(STATUS_BADUSAGE, "No such tty: `"
 718                                             _PATH_DEV "pts/%s'", sp);
 719                                 err(STATUS_ERROR, "Cannot access `"
 720                                     _PATH_DEV "pts/%s'", sp);
 721                                 break;
 722                         default:
 723                                 break;
 724                         }
 725                         continue;
 726                 }
 727
 728                 switch (type) {
 729                 case LT_USER:
 730                         if ((pw = getpwnam(sp)) == NULL)
 731                                 errx(STATUS_BADUSAGE, "Unknown user `%s'", sp);
 732                         li->li_number = pw->pw_uid;
 733                         break;
 734                 case LT_GROUP:
 735                         if ((gr = getgrnam(sp)) == NULL)
 736                                 errx(STATUS_BADUSAGE, "Unknown group `%s'", sp);
 737                         li->li_number = gr->gr_gid;
 738                         break;
 739                 case LT_TTY:
 740                         if (strcmp(sp, "-") == 0) {
 741                                 li->li_number = -1;
 742                                 break;
 743                         } else if (strcmp(sp, "co") == 0) {
 744                                 cp = "console";
 745                         } else {
 746                                 cp = sp;
 747                         }
 748
 749                         snprintf(buf, sizeof(buf), _PATH_DEV "%s", cp);
 750                         if (stat(buf, &st) != -1)
 751                                 goto foundtty;
 752
 753                         snprintf(buf, sizeof(buf), _PATH_DEV "tty%s", cp);
 754                         if (stat(buf, &st) != -1)
 755                                 goto foundtty;
 756
 757                         if (errno == ENOENT)
 758                                 errx(STATUS_BADUSAGE, "No such tty: `%s'", sp);
 759                         err(STATUS_ERROR, "Cannot access `%s'", sp);
 760
 761 foundtty:               if ((st.st_mode & S_IFCHR) == 0)
 762                                 errx(STATUS_BADUSAGE, "Not a tty: `%s'", sp);
 763
 764                         li->li_number = st.st_rdev;
 765                         break;
 766                 case LT_JID:
 767                         if (strcmp(sp, "none") == 0)
 768                                 li->li_number = 0;
 769                         else if (strcmp(sp, "any") == 0)
 770                                 li->li_number = -1;
 771                         else if (*ep != '\0')
 772                                 errx(STATUS_BADUSAGE,
 773                                      "Invalid jail ID `%s'", sp);
 774                         break;
 775                 case LT_CLASS:
 776                         li->li_number = -1;
 777                         li->li_name = strdup(sp);
 778                         if (li->li_name == NULL)
 779                                 err(STATUS_ERROR, "Cannot allocate memory");
 780                         break;
 781                 default:
 782                         usage();
 783                 }
 784         }
 785
 786         if (empty)
 787                 usage();
 788 }
 789
 790 static int
 791 takepid(const char *pidfile, int pidfilelock)
 792 {
 793         char *endp, line[BUFSIZ];
 794         FILE *fh;
 795         long rval;
 796
 797         fh = fopen(pidfile, "r");
 798         if (fh == NULL)
 799                 err(STATUS_ERROR, "Cannot open pidfile `%s'", pidfile);
 800
 801         if (pidfilelock) {
 802                 /*
 803                  * If we can lock pidfile, this means that daemon is not
 804                  * running, so would be better not to kill some random process.
 805                  */
 806                 if (flock(fileno(fh), LOCK_EX | LOCK_NB) == 0) {
 807                         (void)fclose(fh);
 808                         errx(STATUS_ERROR, "File '%s' can be locked", pidfile);
 809                 } else {
 810                         if (errno != EWOULDBLOCK) {
 811                                 errx(STATUS_ERROR,
 812                                     "Error while locking file '%s'", pidfile);
 813                         }
 814                 }
 815         }
 816
 817         if (fgets(line, sizeof(line), fh) == NULL) {
 818                 if (feof(fh)) {
 819                         (void)fclose(fh);
 820                         errx(STATUS_ERROR, "Pidfile `%s' is empty", pidfile);
 821                 }
 822                 (void)fclose(fh);
 823                 err(STATUS_ERROR, "Cannot read from pid file `%s'", pidfile);
 824         }
 825         (void)fclose(fh);
 826
 827         rval = strtol(line, &endp, 10);
 828         if (*endp != '\0' && !isspace((unsigned char)*endp))
 829                 errx(STATUS_ERROR, "Invalid pid in file `%s'", pidfile);
 830         else if (rval < MIN_PID || rval > MAX_PID)
 831                 errx(STATUS_ERROR, "Invalid pid in file `%s'", pidfile);
 832         return (rval);
 833 }