bin/pkill/pkill.c

   1 /*      $NetBSD: pkill.c,v 1.16 2005/10/10 22:13:20 kleink Exp $        */
   2
   3 /*-
   4  * SPDX-License-Identifier: BSD-2-Clause
   5  *
   6  * Copyright (c) 2002 The NetBSD Foundation, Inc.
   7  * Copyright (c) 2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
   8  * All rights reserved.
   9  *
  10  * This code is derived from software contributed to The NetBSD Foundation
  11  * by Andrew Doran.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  24  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  25  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  26  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  32  * POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <sys/types.h>
  39 #include <sys/param.h>
  40 #include <sys/sysctl.h>
  41 #include <sys/proc.h>
  42 #include <sys/queue.h>
  43 #include <sys/stat.h>
  44 #include <sys/time.h>
  45 #include <sys/user.h>
  46
  47 #include <assert.h>
  48 #include <stdbool.h>
  49 #include <stdio.h>
  50 #include <stdlib.h>
  51 #include <limits.h>
  52 #include <paths.h>
  53 #include <string.h>
  54 #include <unistd.h>
  55 #include <signal.h>
  56 #include <regex.h>
  57 #include <ctype.h>
  58 #include <fcntl.h>
  59 #include <kvm.h>
  60 #include <err.h>
  61 #include <pwd.h>
  62 #include <grp.h>
  63 #include <errno.h>
  64 #include <locale.h>
  65 #include <jail.h>
  66
  67 #define STATUS_MATCH    0
  68 #define STATUS_NOMATCH  1
  69 #define STATUS_BADUSAGE 2
  70 #define STATUS_ERROR    3
  71
  72 #define MIN_PID 5
  73 #define MAX_PID 99999
  74
  75 /* Ignore system-processes (if '-S' flag is not specified) and myself. */
  76 #define PSKIP(kp)       ((kp)->ki_pid == mypid ||                       \
  77                          (!kthreads && ((kp)->ki_flag & P_KPROC) != 0))
  78
  79 enum listtype {
  80         LT_GENERIC,
  81         LT_USER,
  82         LT_GROUP,
  83         LT_TTY,
  84         LT_PGRP,
  85         LT_JAIL,
  86         LT_SID,
  87         LT_CLASS
  88 };
  89
  90 struct list {
  91         SLIST_ENTRY(list) li_chain;
  92         long    li_number;
  93         char    *li_name;
  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 int      quiet;
 114 static kvm_t    *kd;
 115 static pid_t    mypid;
 116
 117 static struct listhead euidlist = SLIST_HEAD_INITIALIZER(euidlist);
 118 static struct listhead ruidlist = SLIST_HEAD_INITIALIZER(ruidlist);
 119 static struct listhead rgidlist = SLIST_HEAD_INITIALIZER(rgidlist);
 120 static struct listhead pgrplist = SLIST_HEAD_INITIALIZER(pgrplist);
 121 static struct listhead ppidlist = SLIST_HEAD_INITIALIZER(ppidlist);
 122 static struct listhead tdevlist = SLIST_HEAD_INITIALIZER(tdevlist);
 123 static struct listhead sidlist = SLIST_HEAD_INITIALIZER(sidlist);
 124 static struct listhead jidlist = SLIST_HEAD_INITIALIZER(jidlist);
 125 static struct listhead classlist = SLIST_HEAD_INITIALIZER(classlist);
 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, *mstr, **pargv, *p, *q, *pidfile;
 137         const char *execf, *coref;
 138         size_t bufsz;
 139         int ancestors, debug_opt, did_action;
 140         int i, ch, bestidx, rv, criteria, pidfromfile, pidfilelock;
 141         size_t jsz;
 142         int (*action)(const struct kinfo_proc *);
 143         struct kinfo_proc *kp;
 144         struct list *li;
 145         struct timeval best_tval;
 146         regex_t reg;
 147         regmatch_t regmatch;
 148         pid_t pid;
 149
 150         setlocale(LC_ALL, "");
 151
 152         if (strcmp(getprogname(), "pgrep") == 0) {
 153                 action = grepact;
 154                 pgrep = 1;
 155         } else {
 156                 action = killact;
 157                 p = argv[1];
 158
 159                 if (argc > 1 && p[0] == '-') {
 160                         p++;
 161                         i = (int)strtol(p, &q, 10);
 162                         if (*q == '\0') {
 163                                 signum = i;
 164                                 argv++;
 165                                 argc--;
 166                         } else {
 167                                 if (strncasecmp(p, "SIG", 3) == 0)
 168                                         p += 3;
 169                                 for (i = 1; i < NSIG; i++)
 170                                         if (strcasecmp(sys_signame[i], p) == 0)
 171                                                 break;
 172                                 if (i != NSIG) {
 173                                         signum = i;
 174                                         argv++;
 175                                         argc--;
 176                                 }
 177                         }
 178                 }
 179         }
 180
 181         buf = NULL;
 182         ancestors = 0;
 183         criteria = 0;
 184         debug_opt = 0;
 185         pidfile = NULL;
 186         pidfilelock = 0;
 187         quiet = 0;
 188         execf = NULL;
 189         coref = _PATH_DEVNULL;
 190
 191         while ((ch = getopt(argc, argv, "DF:G:ILM:N:P:SU:ac:d:fg:ij:lnoqs:t:u:vx")) != -1)
 192                 switch (ch) {
 193                 case 'D':
 194                         debug_opt++;
 195                         break;
 196                 case 'F':
 197                         pidfile = optarg;
 198                         criteria = 1;
 199                         break;
 200                 case 'G':
 201                         makelist(&rgidlist, LT_GROUP, optarg);
 202                         criteria = 1;
 203                         break;
 204                 case 'I':
 205                         if (pgrep)
 206                                 usage();
 207                         interactive = 1;
 208                         break;
 209                 case 'L':
 210                         pidfilelock = 1;
 211                         break;
 212                 case 'M':
 213                         coref = optarg;
 214                         break;
 215                 case 'N':
 216                         execf = optarg;
 217                         break;
 218                 case 'P':
 219                         makelist(&ppidlist, LT_GENERIC, optarg);
 220                         criteria = 1;
 221                         break;
 222                 case 'S':
 223                         if (!pgrep)
 224                                 usage();
 225                         kthreads = 1;
 226                         break;
 227                 case 'U':
 228                         makelist(&ruidlist, LT_USER, optarg);
 229                         criteria = 1;
 230                         break;
 231                 case 'a':
 232                         ancestors++;
 233                         break;
 234                 case 'c':
 235                         makelist(&classlist, LT_CLASS, optarg);
 236                         criteria = 1;
 237                         break;
 238                 case 'd':
 239                         if (!pgrep)
 240                                 usage();
 241                         delim = optarg;
 242                         break;
 243                 case 'f':
 244                         matchargs = 1;
 245                         break;
 246                 case 'g':
 247                         makelist(&pgrplist, LT_PGRP, optarg);
 248                         criteria = 1;
 249                         break;
 250                 case 'i':
 251                         cflags |= REG_ICASE;
 252                         break;
 253                 case 'j':
 254                         makelist(&jidlist, LT_JAIL, optarg);
 255                         criteria = 1;
 256                         break;
 257                 case 'l':
 258                         longfmt = 1;
 259                         break;
 260                 case 'n':
 261                         newest = 1;
 262                         criteria = 1;
 263                         break;
 264                 case 'o':
 265                         oldest = 1;
 266                         criteria = 1;
 267                         break;
 268                 case 'q':
 269                         if (!pgrep)
 270                                 usage();
 271                         quiet = 1;
 272                         break;
 273                 case 's':
 274                         makelist(&sidlist, LT_SID, optarg);
 275                         criteria = 1;
 276                         break;
 277                 case 't':
 278                         makelist(&tdevlist, LT_TTY, optarg);
 279                         criteria = 1;
 280                         break;
 281                 case 'u':
 282                         makelist(&euidlist, LT_USER, optarg);
 283                         criteria = 1;
 284                         break;
 285                 case 'v':
 286                         inverse = 1;
 287                         break;
 288                 case 'x':
 289                         fullmatch = 1;
 290                         break;
 291                 default:
 292                         usage();
 293                         /* NOTREACHED */
 294                 }
 295
 296         argc -= optind;
 297         argv += optind;
 298         if (argc != 0)
 299                 criteria = 1;
 300         if (!criteria)
 301                 usage();
 302         if (newest && oldest)
 303                 errx(STATUS_ERROR, "Options -n and -o are mutually exclusive");
 304         if (pidfile != NULL)
 305                 pidfromfile = takepid(pidfile, pidfilelock);
 306         else {
 307                 if (pidfilelock) {
 308                         errx(STATUS_ERROR,
 309                             "Option -L doesn't make sense without -F");
 310                 }
 311                 pidfromfile = -1;
 312         }
 313
 314         mypid = getpid();
 315
 316         /*
 317          * If we're not matching args, we only need a buffer large enough to
 318          * hold some relatively short error strings.  Otherwise, we have to
 319          * assume we'll need up to ARG_MAX bytes for arguments.
 320          */
 321         bufsz = _POSIX2_LINE_MAX;
 322         if (matchargs) {
 323                 long arg_max;
 324
 325                 arg_max = sysconf(_SC_ARG_MAX);
 326                 if (arg_max == -1)
 327                         arg_max = ARG_MAX;
 328
 329                 /*
 330                  * The absolute worst case scenario is ARG_MAX single-byte
 331                  * arguments which we'll then separate with spaces and NUL
 332                  * terminate.
 333                  */
 334                 bufsz = (arg_max * 2) + 1;
 335         }
 336
 337         buf = malloc(bufsz);
 338         if (buf == NULL)
 339                 err(STATUS_ERROR, "malloc");
 340
 341         /*
 342          * Retrieve the list of running processes from the kernel.
 343          */
 344         kd = kvm_openfiles(execf, coref, NULL, O_RDONLY, buf);
 345         if (kd == NULL)
 346                 errx(STATUS_ERROR, "Cannot open kernel files (%s)", buf);
 347
 348         /*
 349          * Use KERN_PROC_PROC instead of KERN_PROC_ALL, since we
 350          * just want processes and not individual kernel threads.
 351          */
 352         if (pidfromfile >= 0)
 353                 plist = kvm_getprocs(kd, KERN_PROC_PID, pidfromfile, &nproc);
 354         else
 355                 plist = kvm_getprocs(kd, KERN_PROC_PROC, 0, &nproc);
 356         if (plist == NULL) {
 357                 errx(STATUS_ERROR, "Cannot get process list (%s)",
 358                     kvm_geterr(kd));
 359         }
 360
 361         /*
 362          * Allocate memory which will be used to keep track of the
 363          * selection.
 364          */
 365         if ((selected = malloc(nproc)) == NULL) {
 366                 err(STATUS_ERROR, "Cannot allocate memory for %d processes",
 367                     nproc);
 368         }
 369         memset(selected, 0, nproc);
 370
 371         /*
 372          * Refine the selection.
 373          */
 374         for (; *argv != NULL; argv++) {
 375                 if ((rv = regcomp(&reg, *argv, cflags)) != 0) {
 376                         regerror(rv, &reg, buf, bufsz);
 377                         errx(STATUS_BADUSAGE,
 378                             "Cannot compile regular expression `%s' (%s)",
 379                             *argv, buf);
 380                 }
 381
 382                 for (i = 0, kp = plist; i < nproc; i++, kp++) {
 383                         if (PSKIP(kp)) {
 384                                 if (debug_opt > 0)
 385                                     fprintf(stderr, "* Skipped %5d %3d %s\n",
 386                                         kp->ki_pid, kp->ki_uid, kp->ki_comm);
 387                                 continue;
 388                         }
 389
 390                         if (matchargs &&
 391                             (pargv = kvm_getargv(kd, kp, 0)) != NULL) {
 392                                 jsz = 0;
 393                                 while (jsz < bufsz && *pargv != NULL) {
 394                                         jsz += snprintf(buf + jsz,
 395                                             bufsz - jsz,
 396                                             pargv[1] != NULL ? "%s " : "%s",
 397                                             pargv[0]);
 398                                         pargv++;
 399                                 }
 400                                 mstr = buf;
 401                         } else
 402                                 mstr = kp->ki_comm;
 403
 404                         rv = regexec(&reg, mstr, 1, &regmatch, 0);
 405                         if (rv == 0) {
 406                                 if (fullmatch) {
 407                                         if (regmatch.rm_so == 0 &&
 408                                             regmatch.rm_eo ==
 409                                             (off_t)strlen(mstr))
 410                                                 selected[i] = 1;
 411                                 } else
 412                                         selected[i] = 1;
 413                         } else if (rv != REG_NOMATCH) {
 414                                 regerror(rv, &reg, buf, bufsz);
 415                                 errx(STATUS_ERROR,
 416                                     "Regular expression evaluation error (%s)",
 417                                     buf);
 418                         }
 419                         if (debug_opt > 1) {
 420                                 const char *rv_res = "NoMatch";
 421                                 if (selected[i])
 422                                         rv_res = "Matched";
 423                                 fprintf(stderr, "* %s %5d %3d %s\n", rv_res,
 424                                     kp->ki_pid, kp->ki_uid, mstr);
 425                         }
 426                 }
 427
 428                 regfree(&reg);
 429         }
 430
 431         for (i = 0, kp = plist; i < nproc; i++, kp++) {
 432                 if (PSKIP(kp))
 433                         continue;
 434
 435                 if (pidfromfile >= 0 && kp->ki_pid != pidfromfile) {
 436                         selected[i] = 0;
 437                         continue;
 438                 }
 439
 440                 SLIST_FOREACH(li, &ruidlist, li_chain)
 441                         if (kp->ki_ruid == (uid_t)li->li_number)
 442                                 break;
 443                 if (SLIST_FIRST(&ruidlist) != NULL && li == NULL) {
 444                         selected[i] = 0;
 445                         continue;
 446                 }
 447
 448                 SLIST_FOREACH(li, &rgidlist, li_chain)
 449                         if (kp->ki_rgid == (gid_t)li->li_number)
 450                                 break;
 451                 if (SLIST_FIRST(&rgidlist) != NULL && li == NULL) {
 452                         selected[i] = 0;
 453                         continue;
 454                 }
 455
 456                 SLIST_FOREACH(li, &euidlist, li_chain)
 457                         if (kp->ki_uid == (uid_t)li->li_number)
 458                                 break;
 459                 if (SLIST_FIRST(&euidlist) != NULL && li == NULL) {
 460                         selected[i] = 0;
 461                         continue;
 462                 }
 463
 464                 SLIST_FOREACH(li, &ppidlist, li_chain)
 465                         if (kp->ki_ppid == (pid_t)li->li_number)
 466                                 break;
 467                 if (SLIST_FIRST(&ppidlist) != NULL && li == NULL) {
 468                         selected[i] = 0;
 469                         continue;
 470                 }
 471
 472                 SLIST_FOREACH(li, &pgrplist, li_chain)
 473                         if (kp->ki_pgid == (pid_t)li->li_number)
 474                                 break;
 475                 if (SLIST_FIRST(&pgrplist) != NULL && li == NULL) {
 476                         selected[i] = 0;
 477                         continue;
 478                 }
 479
 480                 SLIST_FOREACH(li, &tdevlist, li_chain) {
 481                         if (li->li_number == -1 &&
 482                             (kp->ki_flag & P_CONTROLT) == 0)
 483                                 break;
 484                         if (kp->ki_tdev == (dev_t)li->li_number)
 485                                 break;
 486                 }
 487                 if (SLIST_FIRST(&tdevlist) != NULL && li == NULL) {
 488                         selected[i] = 0;
 489                         continue;
 490                 }
 491
 492                 SLIST_FOREACH(li, &sidlist, li_chain)
 493                         if (kp->ki_sid == (pid_t)li->li_number)
 494                                 break;
 495                 if (SLIST_FIRST(&sidlist) != NULL && li == NULL) {
 496                         selected[i] = 0;
 497                         continue;
 498                 }
 499
 500                 SLIST_FOREACH(li, &jidlist, li_chain) {
 501                         /* A particular jail ID, including 0 (not in jail) */
 502                         if (kp->ki_jid == (int)li->li_number)
 503                                 break;
 504                         /* Any jail */
 505                         if (kp->ki_jid > 0 && li->li_number == -1)
 506                                 break;
 507                 }
 508                 if (SLIST_FIRST(&jidlist) != NULL && li == NULL) {
 509                         selected[i] = 0;
 510                         continue;
 511                 }
 512
 513                 SLIST_FOREACH(li, &classlist, li_chain) {
 514                         /*
 515                          * We skip P_SYSTEM processes to match ps(1) output.
 516                          */
 517                         if ((kp->ki_flag & P_SYSTEM) == 0 &&
 518                             strcmp(kp->ki_loginclass, li->li_name) == 0)
 519                                 break;
 520                 }
 521                 if (SLIST_FIRST(&classlist) != NULL && li == NULL) {
 522                         selected[i] = 0;
 523                         continue;
 524                 }
 525
 526                 if (argc == 0)
 527                         selected[i] = 1;
 528         }
 529
 530         if (!ancestors) {
 531                 pid = mypid;
 532                 while (pid) {
 533                         for (i = 0, kp = plist; i < nproc; i++, kp++) {
 534                                 if (PSKIP(kp))
 535                                         continue;
 536                                 if (kp->ki_pid == pid) {
 537                                         selected[i] = 0;
 538                                         pid = kp->ki_ppid;
 539                                         break;
 540                                 }
 541                         }
 542                         if (i == nproc) {
 543                                 if (pid == mypid)
 544                                         pid = getppid();
 545                                 else
 546                                         break;  /* Maybe we're in a jail ? */
 547                         }
 548                 }
 549         }
 550
 551         if (newest || oldest) {
 552                 best_tval.tv_sec = 0;
 553                 best_tval.tv_usec = 0;
 554                 bestidx = -1;
 555
 556                 for (i = 0, kp = plist; i < nproc; i++, kp++) {
 557                         if (!selected[i])
 558                                 continue;
 559                         if (bestidx == -1) {
 560                                 /* The first entry of the list which matched. */
 561                                 ;
 562                         } else if (timercmp(&kp->ki_start, &best_tval, >)) {
 563                                 /* This entry is newer than previous "best". */
 564                                 if (oldest)     /* but we want the oldest */
 565                                         continue;
 566                         } else {
 567                                 /* This entry is older than previous "best". */
 568                                 if (newest)     /* but we want the newest */
 569                                         continue;
 570                         }
 571                         /* This entry is better than previous "best" entry. */
 572                         best_tval.tv_sec = kp->ki_start.tv_sec;
 573                         best_tval.tv_usec = kp->ki_start.tv_usec;
 574                         bestidx = i;
 575                 }
 576
 577                 memset(selected, 0, nproc);
 578                 if (bestidx != -1)
 579                         selected[bestidx] = 1;
 580         }
 581
 582         /*
 583          * Take the appropriate action for each matched process, if any.
 584          */
 585         did_action = 0;
 586         for (i = 0, rv = 0, kp = plist; i < nproc; i++, kp++) {
 587                 if (PSKIP(kp))
 588                         continue;
 589                 if (selected[i]) {
 590                         if (longfmt && !pgrep) {
 591                                 did_action = 1;
 592                                 printf("kill -%d %d\n", signum, kp->ki_pid);
 593                         }
 594                         if (inverse)
 595                                 continue;
 596                 } else if (!inverse)
 597                         continue;
 598                 rv |= (*action)(kp);
 599         }
 600         if (rv && pgrep && !quiet)
 601                 putchar('\n');
 602         if (!did_action && !pgrep && longfmt)
 603                 fprintf(stderr,
 604                     "No matching processes belonging to you were found\n");
 605
 606         free(buf);
 607         exit(rv ? STATUS_MATCH : STATUS_NOMATCH);
 608 }
 609
 610 static void
 611 usage(void)
 612 {
 613         const char *ustr;
 614
 615         if (pgrep)
 616                 ustr = "[-LSfilnoqvx] [-d delim]";
 617         else
 618                 ustr = "[-signal] [-ILfilnovx]";
 619
 620         fprintf(stderr,
 621                 "usage: %s %s [-F pidfile] [-G gid] [-M core] [-N system]\n"
 622                 "             [-P ppid] [-U uid] [-c class] [-g pgrp] [-j jail]\n"
 623                 "             [-s sid] [-t tty] [-u euid] pattern ...\n",
 624                 getprogname(), ustr);
 625
 626         exit(STATUS_BADUSAGE);
 627 }
 628
 629 static void
 630 show_process(const struct kinfo_proc *kp)
 631 {
 632         char **argv;
 633
 634         if (quiet) {
 635                 assert(pgrep);
 636                 return;
 637         }
 638         if ((longfmt || !pgrep) && matchargs &&
 639             (argv = kvm_getargv(kd, kp, 0)) != NULL) {
 640                 printf("%d ", (int)kp->ki_pid);
 641                 for (; *argv != NULL; argv++) {
 642                         printf("%s", *argv);
 643                         if (argv[1] != NULL)
 644                                 putchar(' ');
 645                 }
 646         } else if (longfmt || !pgrep)
 647                 printf("%d %s", (int)kp->ki_pid, kp->ki_comm);
 648         else
 649                 printf("%d", (int)kp->ki_pid);
 650 }
 651
 652 static int
 653 killact(const struct kinfo_proc *kp)
 654 {
 655         int ch, first;
 656
 657         if (interactive) {
 658                 /*
 659                  * Be careful, ask before killing.
 660                  */
 661                 printf("kill ");
 662                 show_process(kp);
 663                 printf("? ");
 664                 fflush(stdout);
 665                 first = ch = getchar();
 666                 while (ch != '\n' && ch != EOF)
 667                         ch = getchar();
 668                 if (first != 'y' && first != 'Y')
 669                         return (1);
 670         }
 671         if (kill(kp->ki_pid, signum) == -1) {
 672                 /*
 673                  * Check for ESRCH, which indicates that the process
 674                  * disappeared between us matching it and us
 675                  * signalling it; don't issue a warning about it.
 676                  */
 677                 if (errno != ESRCH)
 678                         warn("signalling pid %d", (int)kp->ki_pid);
 679                 /*
 680                  * Return 0 to indicate that the process should not be
 681                  * considered a match, since we didn't actually get to
 682                  * signal it.
 683                  */
 684                 return (0);
 685         }
 686         return (1);
 687 }
 688
 689 static int
 690 grepact(const struct kinfo_proc *kp)
 691 {
 692         static bool first = true;
 693
 694         if (!quiet && !first)
 695                 printf("%s", delim);
 696         show_process(kp);
 697         first = false;
 698         return (1);
 699 }
 700
 701 static void
 702 makelist(struct listhead *head, enum listtype type, char *src)
 703 {
 704         struct list *li;
 705         struct passwd *pw;
 706         struct group *gr;
 707         struct stat st;
 708         const char *cp;
 709         char *sp, *ep, buf[MAXPATHLEN];
 710         int empty;
 711
 712         empty = 1;
 713
 714         while ((sp = strsep(&src, ",")) != NULL) {
 715                 if (*sp == '\0')
 716                         usage();
 717
 718                 if ((li = malloc(sizeof(*li))) == NULL) {
 719                         err(STATUS_ERROR, "Cannot allocate %zu bytes",
 720                             sizeof(*li));
 721                 }
 722
 723                 SLIST_INSERT_HEAD(head, li, li_chain);
 724                 empty = 0;
 725
 726                 if (type != LT_CLASS)
 727                         li->li_number = (uid_t)strtol(sp, &ep, 0);
 728
 729                 if (type != LT_CLASS && *ep == '\0') {
 730                         switch (type) {
 731                         case LT_PGRP:
 732                                 if (li->li_number == 0)
 733                                         li->li_number = getpgrp();
 734                                 break;
 735                         case LT_SID:
 736                                 if (li->li_number == 0)
 737                                         li->li_number = getsid(mypid);
 738                                 break;
 739                         case LT_JAIL:
 740                                 if (li->li_number < 0)
 741                                         errx(STATUS_BADUSAGE,
 742                                              "Negative jail ID `%s'", sp);
 743                                 /* For compatibility with old -j */
 744                                 if (li->li_number == 0)
 745                                         li->li_number = -1;     /* any jail */
 746                                 break;
 747                         case LT_TTY:
 748                                 if (li->li_number < 0)
 749                                         errx(STATUS_BADUSAGE,
 750                                              "Negative /dev/pts tty `%s'", sp);
 751                                 snprintf(buf, sizeof(buf), _PATH_DEV "pts/%s",
 752                                     sp);
 753                                 if (stat(buf, &st) != -1)
 754                                         goto foundtty;
 755                                 if (errno == ENOENT)
 756                                         errx(STATUS_BADUSAGE, "No such tty: `"
 757                                             _PATH_DEV "pts/%s'", sp);
 758                                 err(STATUS_ERROR, "Cannot access `"
 759                                     _PATH_DEV "pts/%s'", sp);
 760                                 break;
 761                         default:
 762                                 break;
 763                         }
 764                         continue;
 765                 }
 766
 767                 switch (type) {
 768                 case LT_USER:
 769                         if ((pw = getpwnam(sp)) == NULL)
 770                                 errx(STATUS_BADUSAGE, "Unknown user `%s'", sp);
 771                         li->li_number = pw->pw_uid;
 772                         break;
 773                 case LT_GROUP:
 774                         if ((gr = getgrnam(sp)) == NULL)
 775                                 errx(STATUS_BADUSAGE, "Unknown group `%s'", sp);
 776                         li->li_number = gr->gr_gid;
 777                         break;
 778                 case LT_TTY:
 779                         if (strcmp(sp, "-") == 0) {
 780                                 li->li_number = -1;
 781                                 break;
 782                         } else if (strcmp(sp, "co") == 0) {
 783                                 cp = "console";
 784                         } else {
 785                                 cp = sp;
 786                         }
 787
 788                         snprintf(buf, sizeof(buf), _PATH_DEV "%s", cp);
 789                         if (stat(buf, &st) != -1)
 790                                 goto foundtty;
 791
 792                         snprintf(buf, sizeof(buf), _PATH_DEV "tty%s", cp);
 793                         if (stat(buf, &st) != -1)
 794                                 goto foundtty;
 795
 796                         if (errno == ENOENT)
 797                                 errx(STATUS_BADUSAGE, "No such tty: `%s'", sp);
 798                         err(STATUS_ERROR, "Cannot access `%s'", sp);
 799
 800 foundtty:               if ((st.st_mode & S_IFCHR) == 0)
 801                                 errx(STATUS_BADUSAGE, "Not a tty: `%s'", sp);
 802
 803                         li->li_number = st.st_rdev;
 804                         break;
 805                 case LT_JAIL: {
 806                         int jid;
 807
 808                         if (strcmp(sp, "none") == 0)
 809                                 li->li_number = 0;
 810                         else if (strcmp(sp, "any") == 0)
 811                                 li->li_number = -1;
 812                         else if ((jid = jail_getid(sp)) != -1)
 813                                 li->li_number = jid;
 814                         else if (*ep != '\0')
 815                                 errx(STATUS_BADUSAGE,
 816                                      "Invalid jail ID or name `%s'", sp);
 817                         break;
 818                 }
 819                 case LT_CLASS:
 820                         li->li_number = -1;
 821                         li->li_name = strdup(sp);
 822                         if (li->li_name == NULL)
 823                                 err(STATUS_ERROR, "Cannot allocate memory");
 824                         break;
 825                 default:
 826                         usage();
 827                 }
 828         }
 829
 830         if (empty)
 831                 usage();
 832 }
 833
 834 static int
 835 takepid(const char *pidfile, int pidfilelock)
 836 {
 837         char *endp, line[BUFSIZ];
 838         FILE *fh;
 839         long rval;
 840
 841         fh = fopen(pidfile, "r");
 842         if (fh == NULL)
 843                 err(STATUS_ERROR, "Cannot open pidfile `%s'", pidfile);
 844
 845         if (pidfilelock) {
 846                 /*
 847                  * If we can lock pidfile, this means that daemon is not
 848                  * running, so would be better not to kill some random process.
 849                  */
 850                 if (flock(fileno(fh), LOCK_EX | LOCK_NB) == 0) {
 851                         (void)fclose(fh);
 852                         errx(STATUS_ERROR, "File '%s' can be locked", pidfile);
 853                 } else {
 854                         if (errno != EWOULDBLOCK) {
 855                                 errx(STATUS_ERROR,
 856                                     "Error while locking file '%s'", pidfile);
 857                         }
 858                 }
 859         }
 860
 861         if (fgets(line, sizeof(line), fh) == NULL) {
 862                 if (feof(fh)) {
 863                         (void)fclose(fh);
 864                         errx(STATUS_ERROR, "Pidfile `%s' is empty", pidfile);
 865                 }
 866                 (void)fclose(fh);
 867                 err(STATUS_ERROR, "Cannot read from pid file `%s'", pidfile);
 868         }
 869         (void)fclose(fh);
 870
 871         rval = strtol(line, &endp, 10);
 872         if (*endp != '\0' && !isspace((unsigned char)*endp))
 873                 errx(STATUS_ERROR, "Invalid pid in file `%s'", pidfile);
 874         else if (rval < MIN_PID || rval > MAX_PID)
 875                 errx(STATUS_ERROR, "Invalid pid in file `%s'", pidfile);
 876         return (rval);
 877 }