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 <assert.h>
  53 #include <stdio.h>
  54 #include <stdlib.h>
  55 #include <limits.h>
  56 #include <paths.h>
  57 #include <string.h>
  58 #include <unistd.h>
  59 #include <signal.h>
  60 #include <regex.h>
  61 #include <ctype.h>
  62 #include <fcntl.h>
  63 #include <kvm.h>
  64 #include <err.h>
  65 #include <pwd.h>
  66 #include <grp.h>
  67 #include <errno.h>
  68 #include <locale.h>
  69
  70 #define STATUS_MATCH    0
  71 #define STATUS_NOMATCH  1
  72 #define STATUS_BADUSAGE 2
  73 #define STATUS_ERROR    3
  74
  75 #define MIN_PID 5
  76 #define MAX_PID 99999
  77
  78 /* Ignore system-processes (if '-S' flag is not specified) and myself. */
  79 #define PSKIP(kp)       ((kp)->ki_pid == mypid ||                       \
  80                          (!kthreads && ((kp)->ki_flag & P_KTHREAD) != 0))
  81
  82 enum listtype {
  83         LT_GENERIC,
  84         LT_USER,
  85         LT_GROUP,
  86         LT_TTY,
  87         LT_PGRP,
  88         LT_JID,
  89         LT_SID
  90 };
  91
  92 struct list {
  93         SLIST_ENTRY(list) li_chain;
  94         long    li_number;
  95 };
  96
  97 SLIST_HEAD(listhead, list);
  98
  99 static struct kinfo_proc *plist;
 100 static char     *selected;
 101 static const char *delim = "\n";
 102 static int      nproc;
 103 static int      pgrep;
 104 static int      signum = SIGTERM;
 105 static int      newest;
 106 static int      oldest;
 107 static int      interactive;
 108 static int      inverse;
 109 static int      longfmt;
 110 static int      matchargs;
 111 static int      fullmatch;
 112 static int      kthreads;
 113 static int      cflags = REG_EXTENDED;
 114 static int      quiet;
 115 static kvm_t    *kd;
 116 static pid_t    mypid;
 117
 118 static struct listhead euidlist = SLIST_HEAD_INITIALIZER(euidlist);
 119 static struct listhead ruidlist = SLIST_HEAD_INITIALIZER(ruidlist);
 120 static struct listhead rgidlist = SLIST_HEAD_INITIALIZER(rgidlist);
 121 static struct listhead pgrplist = SLIST_HEAD_INITIALIZER(pgrplist);
 122 static struct listhead ppidlist = SLIST_HEAD_INITIALIZER(ppidlist);
 123 static struct listhead tdevlist = SLIST_HEAD_INITIALIZER(tdevlist);
 124 static struct listhead sidlist = SLIST_HEAD_INITIALIZER(sidlist);
 125 static struct listhead jidlist = SLIST_HEAD_INITIALIZER(jidlist);
 126
 127 static void     usage(void) __attribute__((__noreturn__));
 128 static int      killact(const struct kinfo_proc *);
 129 static int      grepact(const struct kinfo_proc *);
 130 static void     makelist(struct listhead *, enum listtype, char *);
 131 static int      takepid(const char *, int);
 132
 133 int
 134 main(int argc, char **argv)
 135 {
 136         char buf[_POSIX2_LINE_MAX], *mstr, **pargv, *p, *q, *pidfile;
 137         const char *execf, *coref;
 138         int ancestors, debug_opt, did_action;
 139         int i, ch, bestidx, rv, criteria, pidfromfile, pidfilelock;
 140         size_t jsz;
 141         int (*action)(const struct kinfo_proc *);
 142         struct kinfo_proc *kp;
 143         struct list *li;
 144         struct timeval best_tval;
 145         regex_t reg;
 146         regmatch_t regmatch;
 147         pid_t pid;
 148
 149         setlocale(LC_ALL, "");
 150
 151         if (strcmp(getprogname(), "pgrep") == 0) {
 152                 action = grepact;
 153                 pgrep = 1;
 154         } else {
 155                 action = killact;
 156                 p = argv[1];
 157
 158                 if (argc > 1 && p[0] == '-') {
 159                         p++;
 160                         i = (int)strtol(p, &q, 10);
 161                         if (*q == '\0') {
 162                                 signum = i;
 163                                 argv++;
 164                                 argc--;
 165                         } else {
 166                                 if (strncasecmp(p, "sig", 3) == 0)
 167                                         p += 3;
 168                                 for (i = 1; i < NSIG; i++)
 169                                         if (strcasecmp(sys_signame[i], p) == 0)
 170                                                 break;
 171                                 if (i != NSIG) {
 172                                         signum = i;
 173                                         argv++;
 174                                         argc--;
 175                                 }
 176                         }
 177                 }
 178         }
 179
 180         ancestors = 0;
 181         criteria = 0;
 182         debug_opt = 0;
 183         pidfile = NULL;
 184         pidfilelock = 0;
 185         quiet = 0;
 186         execf = NULL;
 187         coref = _PATH_DEVNULL;
 188
 189         while ((ch = getopt(argc, argv, "DF:G:ILM:N:P:SU:ad:fg:ij:lnoqs:t:u:vx")) != -1)
 190                 switch (ch) {
 191                 case 'D':
 192                         debug_opt++;
 193                         break;
 194                 case 'F':
 195                         pidfile = optarg;
 196                         criteria = 1;
 197                         break;
 198                 case 'G':
 199                         makelist(&rgidlist, LT_GROUP, optarg);
 200                         criteria = 1;
 201                         break;
 202                 case 'I':
 203                         if (pgrep)
 204                                 usage();
 205                         interactive = 1;
 206                         break;
 207                 case 'L':
 208                         pidfilelock = 1;
 209                         break;
 210                 case 'M':
 211                         coref = optarg;
 212                         break;
 213                 case 'N':
 214                         execf = optarg;
 215                         break;
 216                 case 'P':
 217                         makelist(&ppidlist, LT_GENERIC, optarg);
 218                         criteria = 1;
 219                         break;
 220                 case 'S':
 221                         if (!pgrep)
 222                                 usage();
 223                         kthreads = 1;
 224                         break;
 225                 case 'U':
 226                         makelist(&ruidlist, LT_USER, optarg);
 227                         criteria = 1;
 228                         break;
 229                 case 'a':
 230                         ancestors++;
 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                 if (argc == 0)
 480                         selected[i] = 1;
 481         }
 482
 483         if (!ancestors) {
 484                 pid = mypid;
 485                 while (pid) {
 486                         for (i = 0, kp = plist; i < nproc; i++, kp++) {
 487                                 if (PSKIP(kp))
 488                                         continue;
 489                                 if (kp->ki_pid == pid) {
 490                                         selected[i] = 0;
 491                                         pid = kp->ki_ppid;
 492                                         break;
 493                                 }
 494                         }
 495                         if (i == nproc) {
 496                                 if (pid == mypid)
 497                                         pid = getppid();
 498                                 else
 499                                         break;  /* Maybe we're in a jail ? */
 500                         }
 501                 }
 502         }
 503
 504         if (newest || oldest) {
 505                 best_tval.tv_sec = 0;
 506                 best_tval.tv_usec = 0;
 507                 bestidx = -1;
 508
 509                 for (i = 0, kp = plist; i < nproc; i++, kp++) {
 510                         if (!selected[i])
 511                                 continue;
 512                         if (bestidx == -1) {
 513                                 /* The first entry of the list which matched. */
 514                                 ;
 515                         } else if (timercmp(&kp->ki_start, &best_tval, >)) {
 516                                 /* This entry is newer than previous "best". */
 517                                 if (oldest)     /* but we want the oldest */
 518                                         continue;
 519                         } else {
 520                                 /* This entry is older than previous "best". */
 521                                 if (newest)     /* but we want the newest */
 522                                         continue;
 523                         }
 524                         /* This entry is better than previous "best" entry. */
 525                         best_tval.tv_sec = kp->ki_start.tv_sec;
 526                         best_tval.tv_usec = kp->ki_start.tv_usec;
 527                         bestidx = i;
 528                 }
 529
 530                 memset(selected, 0, nproc);
 531                 if (bestidx != -1)
 532                         selected[bestidx] = 1;
 533         }
 534
 535         /*
 536          * Take the appropriate action for each matched process, if any.
 537          */
 538         did_action = 0;
 539         for (i = 0, rv = 0, kp = plist; i < nproc; i++, kp++) {
 540                 if (PSKIP(kp))
 541                         continue;
 542                 if (selected[i]) {
 543                         if (longfmt && !pgrep) {
 544                                 did_action = 1;
 545                                 printf("kill -%d %d\n", signum, kp->ki_pid);
 546                         }
 547                         if (inverse)
 548                                 continue;
 549                 } else if (!inverse)
 550                         continue;
 551                 rv |= (*action)(kp);
 552         }
 553         if (!did_action && !pgrep && longfmt)
 554                 fprintf(stderr,
 555                     "No matching processes belonging to you were found\n");
 556
 557         exit(rv ? STATUS_MATCH : STATUS_NOMATCH);
 558 }
 559
 560 static void
 561 usage(void)
 562 {
 563         const char *ustr;
 564
 565         if (pgrep)
 566                 ustr = "[-LSfilnoqvx] [-d delim]";
 567         else
 568                 ustr = "[-signal] [-ILfilnovx]";
 569
 570         fprintf(stderr,
 571                 "usage: %s %s [-F pidfile] [-G gid] [-M core] [-N system]\n"
 572                 "             [-P ppid] [-U uid] [-g pgrp] [-j jid] [-s sid]\n"
 573                 "             [-t tty] [-u euid] pattern ...\n", getprogname(),
 574                 ustr);
 575
 576         exit(STATUS_BADUSAGE);
 577 }
 578
 579 static void
 580 show_process(const struct kinfo_proc *kp)
 581 {
 582         char **argv;
 583
 584         if (quiet) {
 585                 assert(pgrep);
 586                 return;
 587         }
 588         if ((longfmt || !pgrep) && matchargs &&
 589             (argv = kvm_getargv(kd, kp, 0)) != NULL) {
 590                 printf("%d ", (int)kp->ki_pid);
 591                 for (; *argv != NULL; argv++) {
 592                         printf("%s", *argv);
 593                         if (argv[1] != NULL)
 594                                 putchar(' ');
 595                 }
 596         } else if (longfmt || !pgrep)
 597                 printf("%d %s", (int)kp->ki_pid, kp->ki_comm);
 598         else
 599                 printf("%d", (int)kp->ki_pid);
 600 }
 601
 602 static int
 603 killact(const struct kinfo_proc *kp)
 604 {
 605         int ch, first;
 606
 607         if (interactive) {
 608                 /*
 609                  * Be careful, ask before killing.
 610                  */
 611                 printf("kill ");
 612                 show_process(kp);
 613                 printf("? ");
 614                 fflush(stdout);
 615                 first = ch = getchar();
 616                 while (ch != '\n' && ch != EOF)
 617                         ch = getchar();
 618                 if (first != 'y' && first != 'Y')
 619                         return (1);
 620         }
 621         if (kill(kp->ki_pid, signum) == -1) {
 622                 /*
 623                  * Check for ESRCH, which indicates that the process
 624                  * disappeared between us matching it and us
 625                  * signalling it; don't issue a warning about it.
 626                  */
 627                 if (errno != ESRCH)
 628                         warn("signalling pid %d", (int)kp->ki_pid);
 629                 /*
 630                  * Return 0 to indicate that the process should not be
 631                  * considered a match, since we didn't actually get to
 632                  * signal it.
 633                  */
 634                 return (0);
 635         }
 636         return (1);
 637 }
 638
 639 static int
 640 grepact(const struct kinfo_proc *kp)
 641 {
 642
 643         show_process(kp);
 644         if (!quiet)
 645                 printf("%s", delim);
 646         return (1);
 647 }
 648
 649 static void
 650 makelist(struct listhead *head, enum listtype type, char *src)
 651 {
 652         struct list *li;
 653         struct passwd *pw;
 654         struct group *gr;
 655         struct stat st;
 656         const char *cp;
 657         char *sp, *ep, buf[MAXPATHLEN];
 658         int empty;
 659
 660         empty = 1;
 661
 662         while ((sp = strsep(&src, ",")) != NULL) {
 663                 if (*sp == '\0')
 664                         usage();
 665
 666                 if ((li = malloc(sizeof(*li))) == NULL) {
 667                         err(STATUS_ERROR, "Cannot allocate %zu bytes",
 668                             sizeof(*li));
 669                 }
 670
 671                 SLIST_INSERT_HEAD(head, li, li_chain);
 672                 empty = 0;
 673
 674                 li->li_number = (uid_t)strtol(sp, &ep, 0);
 675                 if (*ep == '\0') {
 676                         switch (type) {
 677                         case LT_PGRP:
 678                                 if (li->li_number == 0)
 679                                         li->li_number = getpgrp();
 680                                 break;
 681                         case LT_SID:
 682                                 if (li->li_number == 0)
 683                                         li->li_number = getsid(mypid);
 684                                 break;
 685                         case LT_JID:
 686                                 if (li->li_number < 0)
 687                                         errx(STATUS_BADUSAGE,
 688                                              "Negative jail ID `%s'", sp);
 689                                 /* For compatibility with old -j */
 690                                 if (li->li_number == 0)
 691                                         li->li_number = -1;     /* any jail */
 692                                 break;
 693                         case LT_TTY:
 694                                 usage();
 695                                 /* NOTREACHED */
 696                         default:
 697                                 break;
 698                         }
 699                         continue;
 700                 }
 701
 702                 switch (type) {
 703                 case LT_USER:
 704                         if ((pw = getpwnam(sp)) == NULL)
 705                                 errx(STATUS_BADUSAGE, "Unknown user `%s'", sp);
 706                         li->li_number = pw->pw_uid;
 707                         break;
 708                 case LT_GROUP:
 709                         if ((gr = getgrnam(sp)) == NULL)
 710                                 errx(STATUS_BADUSAGE, "Unknown group `%s'", sp);
 711                         li->li_number = gr->gr_gid;
 712                         break;
 713                 case LT_TTY:
 714                         if (strcmp(sp, "-") == 0) {
 715                                 li->li_number = -1;
 716                                 break;
 717                         } else if (strcmp(sp, "co") == 0) {
 718                                 cp = "console";
 719                         } else {
 720                                 cp = sp;
 721                         }
 722
 723                         snprintf(buf, sizeof(buf), _PATH_DEV "%s", cp);
 724                         if (stat(buf, &st) != -1)
 725                                 goto foundtty;
 726
 727                         snprintf(buf, sizeof(buf), _PATH_DEV "tty%s", cp);
 728                         if (stat(buf, &st) != -1)
 729                                 goto foundtty;
 730
 731                         if (errno == ENOENT)
 732                                 errx(STATUS_BADUSAGE, "No such tty: `%s'", sp);
 733                         err(STATUS_ERROR, "Cannot access `%s'", sp);
 734
 735 foundtty:               if ((st.st_mode & S_IFCHR) == 0)
 736                                 errx(STATUS_BADUSAGE, "Not a tty: `%s'", sp);
 737
 738                         li->li_number = st.st_rdev;
 739                         break;
 740                 case LT_JID:
 741                         if (strcmp(sp, "none") == 0)
 742                                 li->li_number = 0;
 743                         else if (strcmp(sp, "any") == 0)
 744                                 li->li_number = -1;
 745                         else if (*ep != '\0')
 746                                 errx(STATUS_BADUSAGE,
 747                                      "Invalid jail ID `%s'", sp);
 748                         break;
 749                 default:
 750                         usage();
 751                 }
 752         }
 753
 754         if (empty)
 755                 usage();
 756 }
 757
 758 static int
 759 takepid(const char *pidfile, int pidfilelock)
 760 {
 761         char *endp, line[BUFSIZ];
 762         FILE *fh;
 763         long rval;
 764
 765         fh = fopen(pidfile, "r");
 766         if (fh == NULL)
 767                 err(STATUS_ERROR, "Cannot open pidfile `%s'", pidfile);
 768
 769         if (pidfilelock) {
 770                 /*
 771                  * If we can lock pidfile, this means that daemon is not
 772                  * running, so would be better not to kill some random process.
 773                  */
 774                 if (flock(fileno(fh), LOCK_EX | LOCK_NB) == 0) {
 775                         (void)fclose(fh);
 776                         errx(STATUS_ERROR, "File '%s' can be locked", pidfile);
 777                 } else {
 778                         if (errno != EWOULDBLOCK) {
 779                                 errx(STATUS_ERROR,
 780                                     "Error while locking file '%s'", pidfile);
 781                         }
 782                 }
 783         }
 784
 785         if (fgets(line, sizeof(line), fh) == NULL) {
 786                 if (feof(fh)) {
 787                         (void)fclose(fh);
 788                         errx(STATUS_ERROR, "Pidfile `%s' is empty", pidfile);
 789                 }
 790                 (void)fclose(fh);
 791                 err(STATUS_ERROR, "Cannot read from pid file `%s'", pidfile);
 792         }
 793         (void)fclose(fh);
 794
 795         rval = strtol(line, &endp, 10);
 796         if (*endp != '\0' && !isspace((unsigned char)*endp))
 797                 errx(STATUS_ERROR, "Invalid pid in file `%s'", pidfile);
 798         else if (rval < MIN_PID || rval > MAX_PID)
 799                 errx(STATUS_ERROR, "Invalid pid in file `%s'", pidfile);
 800         return (rval);
 801 }