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