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(euidlist);
 117 static struct listhead ruidlist = SLIST_HEAD_INITIALIZER(ruidlist);
 118 static struct listhead rgidlist = SLIST_HEAD_INITIALIZER(rgidlist);
 119 static struct listhead pgrplist = SLIST_HEAD_INITIALIZER(pgrplist);
 120 static struct listhead ppidlist = SLIST_HEAD_INITIALIZER(ppidlist);
 121 static struct listhead tdevlist = SLIST_HEAD_INITIALIZER(tdevlist);
 122 static struct listhead sidlist = SLIST_HEAD_INITIALIZER(sidlist);
 123 static struct listhead jidlist = SLIST_HEAD_INITIALIZER(jidlist);
 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 = NULL;
 184         coref = _PATH_DEVNULL;
 185
 186         while ((ch = getopt(argc, argv, "DF:G:ILM:N:P:SU:ad:fg:ij:lnos:t:u:vx")) != -1)
 187                 switch (ch) {
 188                 case 'D':
 189                         debug_opt++;
 190                         break;
 191                 case 'F':
 192                         pidfile = optarg;
 193                         criteria = 1;
 194                         break;
 195                 case 'G':
 196                         makelist(&rgidlist, LT_GROUP, optarg);
 197                         criteria = 1;
 198                         break;
 199                 case 'I':
 200                         if (pgrep)
 201                                 usage();
 202                         interactive = 1;
 203                         break;
 204                 case 'L':
 205                         pidfilelock = 1;
 206                         break;
 207                 case 'M':
 208                         coref = optarg;
 209                         break;
 210                 case 'N':
 211                         execf = optarg;
 212                         break;
 213                 case 'P':
 214                         makelist(&ppidlist, LT_GENERIC, optarg);
 215                         criteria = 1;
 216                         break;
 217                 case 'S':
 218                         if (!pgrep)
 219                                 usage();
 220                         kthreads = 1;
 221                         break;
 222                 case 'U':
 223                         makelist(&ruidlist, LT_USER, optarg);
 224                         criteria = 1;
 225                         break;
 226                 case 'a':
 227                         ancestors++;
 228                         break;
 229                 case 'd':
 230                         if (!pgrep)
 231                                 usage();
 232                         delim = optarg;
 233                         break;
 234                 case 'f':
 235                         matchargs = 1;
 236                         break;
 237                 case 'g':
 238                         makelist(&pgrplist, LT_PGRP, optarg);
 239                         criteria = 1;
 240                         break;
 241                 case 'i':
 242                         cflags |= REG_ICASE;
 243                         break;
 244                 case 'j':
 245                         makelist(&jidlist, LT_JID, optarg);
 246                         criteria = 1;
 247                         break;
 248                 case 'l':
 249                         if (!pgrep)
 250                                 usage();
 251                         longfmt = 1;
 252                         break;
 253                 case 'n':
 254                         newest = 1;
 255                         criteria = 1;
 256                         break;
 257                 case 'o':
 258                         oldest = 1;
 259                         criteria = 1;
 260                         break;
 261                 case 's':
 262                         makelist(&sidlist, LT_SID, optarg);
 263                         criteria = 1;
 264                         break;
 265                 case 't':
 266                         makelist(&tdevlist, LT_TTY, optarg);
 267                         criteria = 1;
 268                         break;
 269                 case 'u':
 270                         makelist(&euidlist, LT_USER, optarg);
 271                         criteria = 1;
 272                         break;
 273                 case 'v':
 274                         inverse = 1;
 275                         break;
 276                 case 'x':
 277                         fullmatch = 1;
 278                         break;
 279                 default:
 280                         usage();
 281                         /* NOTREACHED */
 282                 }
 283
 284         argc -= optind;
 285         argv += optind;
 286         if (argc != 0)
 287                 criteria = 1;
 288         if (!criteria)
 289                 usage();
 290         if (newest && oldest)
 291                 errx(STATUS_ERROR, "Options -n and -o are mutually exclusive");
 292         if (pidfile != NULL)
 293                 pidfromfile = takepid(pidfile, pidfilelock);
 294         else {
 295                 if (pidfilelock) {
 296                         errx(STATUS_ERROR,
 297                             "Option -L doesn't make sense without -F");
 298                 }
 299                 pidfromfile = -1;
 300         }
 301
 302         mypid = getpid();
 303
 304         /*
 305          * Retrieve the list of running processes from the kernel.
 306          */
 307         kd = kvm_openfiles(execf, coref, NULL, O_RDONLY, buf);
 308         if (kd == NULL)
 309                 errx(STATUS_ERROR, "Cannot open kernel files (%s)", buf);
 310
 311         /*
 312          * Use KERN_PROC_PROC instead of KERN_PROC_ALL, since we
 313          * just want processes and not individual kernel threads.
 314          */
 315         plist = kvm_getprocs(kd, KERN_PROC_PROC, 0, &nproc);
 316         if (plist == NULL) {
 317                 errx(STATUS_ERROR, "Cannot get process list (%s)",
 318                     kvm_geterr(kd));
 319         }
 320
 321         /*
 322          * Allocate memory which will be used to keep track of the
 323          * selection.
 324          */
 325         if ((selected = malloc(nproc)) == NULL) {
 326                 err(STATUS_ERROR, "Cannot allocate memory for %d processes",
 327                     nproc);
 328         }
 329         memset(selected, 0, nproc);
 330
 331         /*
 332          * Refine the selection.
 333          */
 334         for (; *argv != NULL; argv++) {
 335                 if ((rv = regcomp(&reg, *argv, cflags)) != 0) {
 336                         regerror(rv, &reg, buf, sizeof(buf));
 337                         errx(STATUS_BADUSAGE,
 338                             "Cannot compile regular expression `%s' (%s)",
 339                             *argv, buf);
 340                 }
 341
 342                 for (i = 0, kp = plist; i < nproc; i++, kp++) {
 343                         if (PSKIP(kp)) {
 344                                 if (debug_opt > 0)
 345                                     fprintf(stderr, "* Skipped %5d %3d %s\n",
 346                                         kp->ki_pid, kp->ki_uid, kp->ki_comm);
 347                                 continue;
 348                         }
 349
 350                         if (matchargs &&
 351                             (pargv = kvm_getargv(kd, kp, 0)) != NULL) {
 352                                 jsz = 0;
 353                                 while (jsz < sizeof(buf) && *pargv != NULL) {
 354                                         jsz += snprintf(buf + jsz,
 355                                             sizeof(buf) - jsz,
 356                                             pargv[1] != NULL ? "%s " : "%s",
 357                                             pargv[0]);
 358                                         pargv++;
 359                                 }
 360                                 mstr = buf;
 361                         } else
 362                                 mstr = kp->ki_comm;
 363
 364                         rv = regexec(&reg, mstr, 1, &regmatch, 0);
 365                         if (rv == 0) {
 366                                 if (fullmatch) {
 367                                         if (regmatch.rm_so == 0 &&
 368                                             regmatch.rm_eo ==
 369                                             (off_t)strlen(mstr))
 370                                                 selected[i] = 1;
 371                                 } else
 372                                         selected[i] = 1;
 373                         } else if (rv != REG_NOMATCH) {
 374                                 regerror(rv, &reg, buf, sizeof(buf));
 375                                 errx(STATUS_ERROR,
 376                                     "Regular expression evaluation error (%s)",
 377                                     buf);
 378                         }
 379                         if (debug_opt > 1) {
 380                                 const char *rv_res = "NoMatch";
 381                                 if (selected[i])
 382                                         rv_res = "Matched";
 383                                 fprintf(stderr, "* %s %5d %3d %s\n", rv_res,
 384                                     kp->ki_pid, kp->ki_uid, mstr);
 385                         }
 386                 }
 387
 388                 regfree(&reg);
 389         }
 390
 391         for (i = 0, kp = plist; i < nproc; i++, kp++) {
 392                 if (PSKIP(kp))
 393                         continue;
 394
 395                 if (pidfromfile >= 0 && kp->ki_pid != pidfromfile) {
 396                         selected[i] = 0;
 397                         continue;
 398                 }
 399
 400                 SLIST_FOREACH(li, &ruidlist, li_chain)
 401                         if (kp->ki_ruid == (uid_t)li->li_number)
 402                                 break;
 403                 if (SLIST_FIRST(&ruidlist) != NULL && li == NULL) {
 404                         selected[i] = 0;
 405                         continue;
 406                 }
 407
 408                 SLIST_FOREACH(li, &rgidlist, li_chain)
 409                         if (kp->ki_rgid == (gid_t)li->li_number)
 410                                 break;
 411                 if (SLIST_FIRST(&rgidlist) != NULL && li == NULL) {
 412                         selected[i] = 0;
 413                         continue;
 414                 }
 415
 416                 SLIST_FOREACH(li, &euidlist, li_chain)
 417                         if (kp->ki_uid == (uid_t)li->li_number)
 418                                 break;
 419                 if (SLIST_FIRST(&euidlist) != NULL && li == NULL) {
 420                         selected[i] = 0;
 421                         continue;
 422                 }
 423
 424                 SLIST_FOREACH(li, &ppidlist, li_chain)
 425                         if (kp->ki_ppid == (pid_t)li->li_number)
 426                                 break;
 427                 if (SLIST_FIRST(&ppidlist) != NULL && li == NULL) {
 428                         selected[i] = 0;
 429                         continue;
 430                 }
 431
 432                 SLIST_FOREACH(li, &pgrplist, li_chain)
 433                         if (kp->ki_pgid == (pid_t)li->li_number)
 434                                 break;
 435                 if (SLIST_FIRST(&pgrplist) != NULL && li == NULL) {
 436                         selected[i] = 0;
 437                         continue;
 438                 }
 439
 440                 SLIST_FOREACH(li, &tdevlist, li_chain) {
 441                         if (li->li_number == -1 &&
 442                             (kp->ki_flag & P_CONTROLT) == 0)
 443                                 break;
 444                         if (kp->ki_tdev == (dev_t)li->li_number)
 445                                 break;
 446                 }
 447                 if (SLIST_FIRST(&tdevlist) != NULL && li == NULL) {
 448                         selected[i] = 0;
 449                         continue;
 450                 }
 451
 452                 SLIST_FOREACH(li, &sidlist, li_chain)
 453                         if (kp->ki_sid == (pid_t)li->li_number)
 454                                 break;
 455                 if (SLIST_FIRST(&sidlist) != NULL && li == NULL) {
 456                         selected[i] = 0;
 457                         continue;
 458                 }
 459
 460                 SLIST_FOREACH(li, &jidlist, li_chain) {
 461                         /* A particular jail ID, including 0 (not in jail) */
 462                         if (kp->ki_jid == (int)li->li_number)
 463                                 break;
 464                         /* Any jail */
 465                         if (kp->ki_jid > 0 && li->li_number == -1)
 466                                 break;
 467                 }
 468                 if (SLIST_FIRST(&jidlist) != NULL && li == NULL) {
 469                         selected[i] = 0;
 470                         continue;
 471                 }
 472
 473                 if (argc == 0)
 474                         selected[i] = 1;
 475         }
 476
 477         if (!ancestors) {
 478                 pid = mypid;
 479                 while (pid) {
 480                         for (i = 0, kp = plist; i < nproc; i++, kp++) {
 481                                 if (PSKIP(kp))
 482                                         continue;
 483                                 if (kp->ki_pid == pid) {
 484                                         selected[i] = 0;
 485                                         pid = kp->ki_ppid;
 486                                         break;
 487                                 }
 488                         }
 489                         if (i == nproc) {
 490                                 if (pid == mypid)
 491                                         pid = getppid();
 492                                 else
 493                                         break;  /* Maybe we're in a jail ? */
 494                         }
 495                 }
 496         }
 497
 498         if (newest || oldest) {
 499                 best_tval.tv_sec = 0;
 500                 best_tval.tv_usec = 0;
 501                 bestidx = -1;
 502
 503                 for (i = 0, kp = plist; i < nproc; i++, kp++) {
 504                         if (!selected[i])
 505                                 continue;
 506                         if (bestidx == -1) {
 507                                 /* The first entry of the list which matched. */
 508                                 ;
 509                         } else if (timercmp(&kp->ki_start, &best_tval, >)) {
 510                                 /* This entry is newer than previous "best". */
 511                                 if (oldest)     /* but we want the oldest */
 512                                         continue;
 513                         } else {
 514                                 /* This entry is older than previous "best". */
 515                                 if (newest)     /* but we want the newest */
 516                                         continue;
 517                         }
 518                         /* This entry is better than previous "best" entry. */
 519                         best_tval.tv_sec = kp->ki_start.tv_sec;
 520                         best_tval.tv_usec = kp->ki_start.tv_usec;
 521                         bestidx = i;
 522                 }
 523
 524                 memset(selected, 0, nproc);
 525                 if (bestidx != -1)
 526                         selected[bestidx] = 1;
 527         }
 528
 529         /*
 530          * Take the appropriate action for each matched process, if any.
 531          */
 532         for (i = 0, rv = 0, kp = plist; i < nproc; i++, kp++) {
 533                 if (PSKIP(kp))
 534                         continue;
 535                 if (selected[i]) {
 536                         if (inverse)
 537                                 continue;
 538                 } else if (!inverse)
 539                         continue;
 540                 rv |= (*action)(kp);
 541         }
 542
 543         exit(rv ? STATUS_MATCH : STATUS_NOMATCH);
 544 }
 545
 546 static void
 547 usage(void)
 548 {
 549         const char *ustr;
 550
 551         if (pgrep)
 552                 ustr = "[-LSfilnovx] [-d delim]";
 553         else
 554                 ustr = "[-signal] [-ILfinovx]";
 555
 556         fprintf(stderr,
 557                 "usage: %s %s [-F pidfile] [-G gid] [-M core] [-N system]\n"
 558                 "             [-P ppid] [-U uid] [-g pgrp] [-j jid] [-s sid]\n"
 559                 "             [-t tty] [-u euid] pattern ...\n", getprogname(),
 560                 ustr);
 561
 562         exit(STATUS_BADUSAGE);
 563 }
 564
 565 static void
 566 show_process(const struct kinfo_proc *kp)
 567 {
 568         char **argv;
 569
 570         if ((longfmt || !pgrep) && matchargs &&
 571             (argv = kvm_getargv(kd, kp, 0)) != NULL) {
 572                 printf("%d ", (int)kp->ki_pid);
 573                 for (; *argv != NULL; argv++) {
 574                         printf("%s", *argv);
 575                         if (argv[1] != NULL)
 576                                 putchar(' ');
 577                 }
 578         } else if (longfmt || !pgrep)
 579                 printf("%d %s", (int)kp->ki_pid, kp->ki_comm);
 580         else
 581                 printf("%d", (int)kp->ki_pid);
 582 }
 583
 584 static int
 585 killact(const struct kinfo_proc *kp)
 586 {
 587         int ch, first;
 588
 589         if (interactive) {
 590                 /*
 591                  * Be careful, ask before killing.
 592                  */
 593                 printf("kill ");
 594                 show_process(kp);
 595                 printf("? ");
 596                 fflush(stdout);
 597                 first = ch = getchar();
 598                 while (ch != '\n' && ch != EOF)
 599                         ch = getchar();
 600                 if (first != 'y' && first != 'Y')
 601                         return (1);
 602         }
 603         if (kill(kp->ki_pid, signum) == -1) {
 604                 /*
 605                  * Check for ESRCH, which indicates that the process
 606                  * disappeared between us matching it and us
 607                  * signalling it; don't issue a warning about it.
 608                  */
 609                 if (errno != ESRCH)
 610                         warn("signalling pid %d", (int)kp->ki_pid);
 611                 /*
 612                  * Return 0 to indicate that the process should not be
 613                  * considered a match, since we didn't actually get to
 614                  * signal it.
 615                  */
 616                 return (0);
 617         }
 618         return (1);
 619 }
 620
 621 static int
 622 grepact(const struct kinfo_proc *kp)
 623 {
 624
 625         show_process(kp);
 626         printf("%s", delim);
 627         return (1);
 628 }
 629
 630 static void
 631 makelist(struct listhead *head, enum listtype type, char *src)
 632 {
 633         struct list *li;
 634         struct passwd *pw;
 635         struct group *gr;
 636         struct stat st;
 637         const char *cp;
 638         char *sp, *ep, buf[MAXPATHLEN];
 639         int empty;
 640
 641         empty = 1;
 642
 643         while ((sp = strsep(&src, ",")) != NULL) {
 644                 if (*sp == '\0')
 645                         usage();
 646
 647                 if ((li = malloc(sizeof(*li))) == NULL) {
 648                         err(STATUS_ERROR, "Cannot allocate %zu bytes",
 649                             sizeof(*li));
 650                 }
 651
 652                 SLIST_INSERT_HEAD(head, li, li_chain);
 653                 empty = 0;
 654
 655                 li->li_number = (uid_t)strtol(sp, &ep, 0);
 656                 if (*ep == '\0') {
 657                         switch (type) {
 658                         case LT_PGRP:
 659                                 if (li->li_number == 0)
 660                                         li->li_number = getpgrp();
 661                                 break;
 662                         case LT_SID:
 663                                 if (li->li_number == 0)
 664                                         li->li_number = getsid(mypid);
 665                                 break;
 666                         case LT_JID:
 667                                 if (li->li_number < 0)
 668                                         errx(STATUS_BADUSAGE,
 669                                              "Negative jail ID `%s'", sp);
 670                                 /* For compatibility with old -j */
 671                                 if (li->li_number == 0)
 672                                         li->li_number = -1;     /* any jail */
 673                                 break;
 674                         case LT_TTY:
 675                                 usage();
 676                                 /* NOTREACHED */
 677                         default:
 678                                 break;
 679                         }
 680                         continue;
 681                 }
 682
 683                 switch (type) {
 684                 case LT_USER:
 685                         if ((pw = getpwnam(sp)) == NULL)
 686                                 errx(STATUS_BADUSAGE, "Unknown user `%s'", sp);
 687                         li->li_number = pw->pw_uid;
 688                         break;
 689                 case LT_GROUP:
 690                         if ((gr = getgrnam(sp)) == NULL)
 691                                 errx(STATUS_BADUSAGE, "Unknown group `%s'", sp);
 692                         li->li_number = gr->gr_gid;
 693                         break;
 694                 case LT_TTY:
 695                         if (strcmp(sp, "-") == 0) {
 696                                 li->li_number = -1;
 697                                 break;
 698                         } else if (strcmp(sp, "co") == 0) {
 699                                 cp = "console";
 700                         } else {
 701                                 cp = sp;
 702                         }
 703
 704                         snprintf(buf, sizeof(buf), _PATH_DEV "%s", cp);
 705                         if (stat(buf, &st) != -1)
 706                                 goto foundtty;
 707
 708                         snprintf(buf, sizeof(buf), _PATH_DEV "tty%s", cp);
 709                         if (stat(buf, &st) != -1)
 710                                 goto foundtty;
 711
 712                         if (errno == ENOENT)
 713                                 errx(STATUS_BADUSAGE, "No such tty: `%s'", sp);
 714                         err(STATUS_ERROR, "Cannot access `%s'", sp);
 715
 716 foundtty:               if ((st.st_mode & S_IFCHR) == 0)
 717                                 errx(STATUS_BADUSAGE, "Not a tty: `%s'", sp);
 718
 719                         li->li_number = st.st_rdev;
 720                         break;
 721                 case LT_JID:
 722                         if (strcmp(sp, "none") == 0)
 723                                 li->li_number = 0;
 724                         else if (strcmp(sp, "any") == 0)
 725                                 li->li_number = -1;
 726                         else if (*ep != '\0')
 727                                 errx(STATUS_BADUSAGE,
 728                                      "Invalid jail ID `%s'", sp);
 729                         break;
 730                 default:
 731                         usage();
 732                 }
 733         }
 734
 735         if (empty)
 736                 usage();
 737 }
 738
 739 static int
 740 takepid(const char *pidfile, int pidfilelock)
 741 {
 742         char *endp, line[BUFSIZ];
 743         FILE *fh;
 744         long rval;
 745
 746         fh = fopen(pidfile, "r");
 747         if (fh == NULL)
 748                 err(STATUS_ERROR, "Cannot open pidfile `%s'", pidfile);
 749
 750         if (pidfilelock) {
 751                 /*
 752                  * If we can lock pidfile, this means that daemon is not
 753                  * running, so would be better not to kill some random process.
 754                  */
 755                 if (flock(fileno(fh), LOCK_EX | LOCK_NB) == 0) {
 756                         (void)fclose(fh);
 757                         errx(STATUS_ERROR, "File '%s' can be locked", pidfile);
 758                 } else {
 759                         if (errno != EWOULDBLOCK) {
 760                                 errx(STATUS_ERROR,
 761                                     "Error while locking file '%s'", pidfile);
 762                         }
 763                 }
 764         }
 765
 766         if (fgets(line, sizeof(line), fh) == NULL) {
 767                 if (feof(fh)) {
 768                         (void)fclose(fh);
 769                         errx(STATUS_ERROR, "Pidfile `%s' is empty", pidfile);
 770                 }
 771                 (void)fclose(fh);
 772                 err(STATUS_ERROR, "Cannot read from pid file `%s'", pidfile);
 773         }
 774         (void)fclose(fh);
 775
 776         rval = strtol(line, &endp, 10);
 777         if (*endp != '\0' && !isspace((unsigned char)*endp))
 778                 errx(STATUS_ERROR, "Invalid pid in file `%s'", pidfile);
 779         else if (rval < MIN_PID || rval > MAX_PID)
 780                 errx(STATUS_ERROR, "Invalid pid in file `%s'", pidfile);
 781         return (rval);
 782 }