bin/pkill/pkill.c

   1 /*      $NetBSD: pkill.c,v 1.16 2005/10/10 22:13:20 kleink Exp $        */
   2
   3 /*-
   4  * Copyright (c) 2002 The NetBSD Foundation, Inc.
   5  * Copyright (c) 2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
   6  * All rights reserved.
   7  *
   8  * This code is derived from software contributed to The NetBSD Foundation
   9  * by Andrew Doran.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  30  * POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <sys/types.h>
  37 #include <sys/param.h>
  38 #include <sys/sysctl.h>
  39 #include <sys/proc.h>
  40 #include <sys/queue.h>
  41 #include <sys/stat.h>
  42 #include <sys/time.h>
  43 #include <sys/user.h>
  44
  45 #include <assert.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <limits.h>
  49 #include <paths.h>
  50 #include <string.h>
  51 #include <unistd.h>
  52 #include <signal.h>
  53 #include <regex.h>
  54 #include <ctype.h>
  55 #include <fcntl.h>
  56 #include <kvm.h>
  57 #include <err.h>
  58 #include <pwd.h>
  59 #include <grp.h>
  60 #include <errno.h>
  61 #include <locale.h>
  62
  63 #define STATUS_MATCH    0
  64 #define STATUS_NOMATCH  1
  65 #define STATUS_BADUSAGE 2
  66 #define STATUS_ERROR    3
  67
  68 #define MIN_PID 5
  69 #define MAX_PID 99999
  70
  71 /* Ignore system-processes (if '-S' flag is not specified) and myself. */
  72 #define PSKIP(kp)       ((kp)->ki_pid == mypid ||                       \
  73                          (!kthreads && ((kp)->ki_flag & P_KTHREAD) != 0))
  74
  75 enum listtype {
  76         LT_GENERIC,
  77         LT_USER,
  78         LT_GROUP,
  79         LT_TTY,
  80         LT_PGRP,
  81         LT_JID,
  82         LT_SID
  83 };
  84
  85 struct list {
  86         SLIST_ENTRY(list) li_chain;
  87         long    li_number;
  88 };
  89
  90 SLIST_HEAD(listhead, list);
  91
  92 static struct kinfo_proc *plist;
  93 static char     *selected;
  94 static const char *delim = "\n";
  95 static int      nproc;
  96 static int      pgrep;
  97 static int      signum = SIGTERM;
  98 static int      newest;
  99 static int      oldest;
 100 static int      interactive;
 101 static int      inverse;
 102 static int      longfmt;
 103 static int      matchargs;
 104 static int      fullmatch;
 105 static int      kthreads;
 106 static int      cflags = REG_EXTENDED;
 107 static int      quiet;
 108 static kvm_t    *kd;
 109 static pid_t    mypid;
 110
 111 static struct listhead euidlist = SLIST_HEAD_INITIALIZER(euidlist);
 112 static struct listhead ruidlist = SLIST_HEAD_INITIALIZER(ruidlist);
 113 static struct listhead rgidlist = SLIST_HEAD_INITIALIZER(rgidlist);
 114 static struct listhead pgrplist = SLIST_HEAD_INITIALIZER(pgrplist);
 115 static struct listhead ppidlist = SLIST_HEAD_INITIALIZER(ppidlist);
 116 static struct listhead tdevlist = SLIST_HEAD_INITIALIZER(tdevlist);
 117 static struct listhead sidlist = SLIST_HEAD_INITIALIZER(sidlist);
 118 static struct listhead jidlist = SLIST_HEAD_INITIALIZER(jidlist);
 119
 120 static void     usage(void) __attribute__((__noreturn__));
 121 static int      killact(const struct kinfo_proc *);
 122 static int      grepact(const struct kinfo_proc *);
 123 static void     makelist(struct listhead *, enum listtype, char *);
 124 static int      takepid(const char *, int);
 125
 126 int
 127 main(int argc, char **argv)
 128 {
 129         char buf[_POSIX2_LINE_MAX], *mstr, **pargv, *p, *q, *pidfile;
 130         const char *execf, *coref;
 131         int ancestors, debug_opt, did_action;
 132         int i, ch, bestidx, rv, criteria, pidfromfile, pidfilelock;
 133         size_t jsz;
 134         int (*action)(const struct kinfo_proc *);
 135         struct kinfo_proc *kp;
 136         struct list *li;
 137         struct timeval best_tval;
 138         regex_t reg;
 139         regmatch_t regmatch;
 140         pid_t pid;
 141
 142         setlocale(LC_ALL, "");
 143
 144         if (strcmp(getprogname(), "pgrep") == 0) {
 145                 action = grepact;
 146                 pgrep = 1;
 147         } else {
 148                 action = killact;
 149                 p = argv[1];
 150
 151                 if (argc > 1 && p[0] == '-') {
 152                         p++;
 153                         i = (int)strtol(p, &q, 10);
 154                         if (*q == '\0') {
 155                                 signum = i;
 156                                 argv++;
 157                                 argc--;
 158                         } else {
 159                                 if (strncasecmp(p, "SIG", 3) == 0)
 160                                         p += 3;
 161                                 for (i = 1; i < NSIG; i++)
 162                                         if (strcasecmp(sys_signame[i], p) == 0)
 163                                                 break;
 164                                 if (i != NSIG) {
 165                                         signum = i;
 166                                         argv++;
 167                                         argc--;
 168                                 }
 169                         }
 170                 }
 171         }
 172
 173         ancestors = 0;
 174         criteria = 0;
 175         debug_opt = 0;
 176         pidfile = NULL;
 177         pidfilelock = 0;
 178         quiet = 0;
 179         execf = NULL;
 180         coref = _PATH_DEVNULL;
 181
 182         while ((ch = getopt(argc, argv, "DF:G:ILM:N:P:SU:ad:fg:ij:lnoqs:t:u:vx")) != -1)
 183                 switch (ch) {
 184                 case 'D':
 185                         debug_opt++;
 186                         break;
 187                 case 'F':
 188                         pidfile = optarg;
 189                         criteria = 1;
 190                         break;
 191                 case 'G':
 192                         makelist(&rgidlist, LT_GROUP, optarg);
 193                         criteria = 1;
 194                         break;
 195                 case 'I':
 196                         if (pgrep)
 197                                 usage();
 198                         interactive = 1;
 199                         break;
 200                 case 'L':
 201                         pidfilelock = 1;
 202                         break;
 203                 case 'M':
 204                         coref = optarg;
 205                         break;
 206                 case 'N':
 207                         execf = optarg;
 208                         break;
 209                 case 'P':
 210                         makelist(&ppidlist, LT_GENERIC, optarg);
 211                         criteria = 1;
 212                         break;
 213                 case 'S':
 214                         if (!pgrep)
 215                                 usage();
 216                         kthreads = 1;
 217                         break;
 218                 case 'U':
 219                         makelist(&ruidlist, LT_USER, optarg);
 220                         criteria = 1;
 221                         break;
 222                 case 'a':
 223                         ancestors++;
 224                         break;
 225                 case 'd':
 226                         if (!pgrep)
 227                                 usage();
 228                         delim = optarg;
 229                         break;
 230                 case 'f':
 231                         matchargs = 1;
 232                         break;
 233                 case 'g':
 234                         makelist(&pgrplist, LT_PGRP, optarg);
 235                         criteria = 1;
 236                         break;
 237                 case 'i':
 238                         cflags |= REG_ICASE;
 239                         break;
 240                 case 'j':
 241                         makelist(&jidlist, LT_JID, optarg);
 242                         criteria = 1;
 243                         break;
 244                 case 'l':
 245                         longfmt = 1;
 246                         break;
 247                 case 'n':
 248                         newest = 1;
 249                         criteria = 1;
 250                         break;
 251                 case 'o':
 252                         oldest = 1;
 253                         criteria = 1;
 254                         break;
 255                 case 'q':
 256                         if (!pgrep)
 257                                 usage();
 258                         quiet = 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         did_action = 0;
 532         for (i = 0, rv = 0, kp = plist; i < nproc; i++, kp++) {
 533                 if (PSKIP(kp))
 534                         continue;
 535                 if (selected[i]) {
 536                         if (longfmt && !pgrep) {
 537                                 did_action = 1;
 538                                 printf("kill -%d %d\n", signum, kp->ki_pid);
 539                         }
 540                         if (inverse)
 541                                 continue;
 542                 } else if (!inverse)
 543                         continue;
 544                 rv |= (*action)(kp);
 545         }
 546         if (!did_action && !pgrep && longfmt)
 547                 fprintf(stderr,
 548                     "No matching processes belonging to you were found\n");
 549
 550         exit(rv ? STATUS_MATCH : STATUS_NOMATCH);
 551 }
 552
 553 static void
 554 usage(void)
 555 {
 556         const char *ustr;
 557
 558         if (pgrep)
 559                 ustr = "[-LSfilnoqvx] [-d delim]";
 560         else
 561                 ustr = "[-signal] [-ILfilnovx]";
 562
 563         fprintf(stderr,
 564                 "usage: %s %s [-F pidfile] [-G gid] [-M core] [-N system]\n"
 565                 "             [-P ppid] [-U uid] [-g pgrp] [-j jid] [-s sid]\n"
 566                 "             [-t tty] [-u euid] pattern ...\n", getprogname(),
 567                 ustr);
 568
 569         exit(STATUS_BADUSAGE);
 570 }
 571
 572 static void
 573 show_process(const struct kinfo_proc *kp)
 574 {
 575         char **argv;
 576
 577         if (quiet) {
 578                 assert(pgrep);
 579                 return;
 580         }
 581         if ((longfmt || !pgrep) && matchargs &&
 582             (argv = kvm_getargv(kd, kp, 0)) != NULL) {
 583                 printf("%d ", (int)kp->ki_pid);
 584                 for (; *argv != NULL; argv++) {
 585                         printf("%s", *argv);
 586                         if (argv[1] != NULL)
 587                                 putchar(' ');
 588                 }
 589         } else if (longfmt || !pgrep)
 590                 printf("%d %s", (int)kp->ki_pid, kp->ki_comm);
 591         else
 592                 printf("%d", (int)kp->ki_pid);
 593 }
 594
 595 static int
 596 killact(const struct kinfo_proc *kp)
 597 {
 598         int ch, first;
 599
 600         if (interactive) {
 601                 /*
 602                  * Be careful, ask before killing.
 603                  */
 604                 printf("kill ");
 605                 show_process(kp);
 606                 printf("? ");
 607                 fflush(stdout);
 608                 first = ch = getchar();
 609                 while (ch != '\n' && ch != EOF)
 610                         ch = getchar();
 611                 if (first != 'y' && first != 'Y')
 612                         return (1);
 613         }
 614         if (kill(kp->ki_pid, signum) == -1) {
 615                 /*
 616                  * Check for ESRCH, which indicates that the process
 617                  * disappeared between us matching it and us
 618                  * signalling it; don't issue a warning about it.
 619                  */
 620                 if (errno != ESRCH)
 621                         warn("signalling pid %d", (int)kp->ki_pid);
 622                 /*
 623                  * Return 0 to indicate that the process should not be
 624                  * considered a match, since we didn't actually get to
 625                  * signal it.
 626                  */
 627                 return (0);
 628         }
 629         return (1);
 630 }
 631
 632 static int
 633 grepact(const struct kinfo_proc *kp)
 634 {
 635
 636         show_process(kp);
 637         if (!quiet)
 638                 printf("%s", delim);
 639         return (1);
 640 }
 641
 642 static void
 643 makelist(struct listhead *head, enum listtype type, char *src)
 644 {
 645         struct list *li;
 646         struct passwd *pw;
 647         struct group *gr;
 648         struct stat st;
 649         const char *cp;
 650         char *sp, *ep, buf[MAXPATHLEN];
 651         int empty;
 652
 653         empty = 1;
 654
 655         while ((sp = strsep(&src, ",")) != NULL) {
 656                 if (*sp == '\0')
 657                         usage();
 658
 659                 if ((li = malloc(sizeof(*li))) == NULL) {
 660                         err(STATUS_ERROR, "Cannot allocate %zu bytes",
 661                             sizeof(*li));
 662                 }
 663
 664                 SLIST_INSERT_HEAD(head, li, li_chain);
 665                 empty = 0;
 666
 667                 li->li_number = (uid_t)strtol(sp, &ep, 0);
 668                 if (*ep == '\0') {
 669                         switch (type) {
 670                         case LT_PGRP:
 671                                 if (li->li_number == 0)
 672                                         li->li_number = getpgrp();
 673                                 break;
 674                         case LT_SID:
 675                                 if (li->li_number == 0)
 676                                         li->li_number = getsid(mypid);
 677                                 break;
 678                         case LT_JID:
 679                                 if (li->li_number < 0)
 680                                         errx(STATUS_BADUSAGE,
 681                                              "Negative jail ID `%s'", sp);
 682                                 /* For compatibility with old -j */
 683                                 if (li->li_number == 0)
 684                                         li->li_number = -1;     /* any jail */
 685                                 break;
 686                         case LT_TTY:
 687                                 if (li->li_number < 0)
 688                                         errx(STATUS_BADUSAGE,
 689                                              "Negative /dev/pts tty `%s'", sp);
 690                                 snprintf(buf, sizeof(buf), _PATH_DEV "pts/%s",
 691                                     sp);
 692                                 if (stat(buf, &st) != -1)
 693                                         goto foundtty;
 694                                 if (errno == ENOENT)
 695                                         errx(STATUS_BADUSAGE, "No such tty: `"
 696                                             _PATH_DEV "pts/%s'", sp);
 697                                 err(STATUS_ERROR, "Cannot access `"
 698                                     _PATH_DEV "pts/%s'", sp);
 699                                 break;
 700                         default:
 701                                 break;
 702                         }
 703                         continue;
 704                 }
 705
 706                 switch (type) {
 707                 case LT_USER:
 708                         if ((pw = getpwnam(sp)) == NULL)
 709                                 errx(STATUS_BADUSAGE, "Unknown user `%s'", sp);
 710                         li->li_number = pw->pw_uid;
 711                         break;
 712                 case LT_GROUP:
 713                         if ((gr = getgrnam(sp)) == NULL)
 714                                 errx(STATUS_BADUSAGE, "Unknown group `%s'", sp);
 715                         li->li_number = gr->gr_gid;
 716                         break;
 717                 case LT_TTY:
 718                         if (strcmp(sp, "-") == 0) {
 719                                 li->li_number = -1;
 720                                 break;
 721                         } else if (strcmp(sp, "co") == 0) {
 722                                 cp = "console";
 723                         } else {
 724                                 cp = sp;
 725                         }
 726
 727                         snprintf(buf, sizeof(buf), _PATH_DEV "%s", cp);
 728                         if (stat(buf, &st) != -1)
 729                                 goto foundtty;
 730
 731                         snprintf(buf, sizeof(buf), _PATH_DEV "tty%s", cp);
 732                         if (stat(buf, &st) != -1)
 733                                 goto foundtty;
 734
 735                         if (errno == ENOENT)
 736                                 errx(STATUS_BADUSAGE, "No such tty: `%s'", sp);
 737                         err(STATUS_ERROR, "Cannot access `%s'", sp);
 738
 739 foundtty:               if ((st.st_mode & S_IFCHR) == 0)
 740                                 errx(STATUS_BADUSAGE, "Not a tty: `%s'", sp);
 741
 742                         li->li_number = st.st_rdev;
 743                         break;
 744                 case LT_JID:
 745                         if (strcmp(sp, "none") == 0)
 746                                 li->li_number = 0;
 747                         else if (strcmp(sp, "any") == 0)
 748                                 li->li_number = -1;
 749                         else if (*ep != '\0')
 750                                 errx(STATUS_BADUSAGE,
 751                                      "Invalid jail ID `%s'", sp);
 752                         break;
 753                 default:
 754                         usage();
 755                 }
 756         }
 757
 758         if (empty)
 759                 usage();
 760 }
 761
 762 static int
 763 takepid(const char *pidfile, int pidfilelock)
 764 {
 765         char *endp, line[BUFSIZ];
 766         FILE *fh;
 767         long rval;
 768
 769         fh = fopen(pidfile, "r");
 770         if (fh == NULL)
 771                 err(STATUS_ERROR, "Cannot open pidfile `%s'", pidfile);
 772
 773         if (pidfilelock) {
 774                 /*
 775                  * If we can lock pidfile, this means that daemon is not
 776                  * running, so would be better not to kill some random process.
 777                  */
 778                 if (flock(fileno(fh), LOCK_EX | LOCK_NB) == 0) {
 779                         (void)fclose(fh);
 780                         errx(STATUS_ERROR, "File '%s' can be locked", pidfile);
 781                 } else {
 782                         if (errno != EWOULDBLOCK) {
 783                                 errx(STATUS_ERROR,
 784                                     "Error while locking file '%s'", pidfile);
 785                         }
 786                 }
 787         }
 788
 789         if (fgets(line, sizeof(line), fh) == NULL) {
 790                 if (feof(fh)) {
 791                         (void)fclose(fh);
 792                         errx(STATUS_ERROR, "Pidfile `%s' is empty", pidfile);
 793                 }
 794                 (void)fclose(fh);
 795                 err(STATUS_ERROR, "Cannot read from pid file `%s'", pidfile);
 796         }
 797         (void)fclose(fh);
 798
 799         rval = strtol(line, &endp, 10);
 800         if (*endp != '\0' && !isspace((unsigned char)*endp))
 801                 errx(STATUS_ERROR, "Invalid pid in file `%s'", pidfile);
 802         else if (rval < MIN_PID || rval > MAX_PID)
 803                 errx(STATUS_ERROR, "Invalid pid in file `%s'", pidfile);
 804         return (rval);
 805 }