procps/pidof.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * pidof implementation for busybox
   4  *
   5  * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
   6  *
   7  * Licensed under the GPL version 2, see the file LICENSE in this tarball.
   8  */
   9
  10 #include "busybox.h"
  11
  12 enum {
  13         USE_FEATURE_PIDOF_SINGLE(OPTBIT_SINGLE,)
  14         USE_FEATURE_PIDOF_OMIT(  OPTBIT_OMIT  ,)
  15         OPT_SINGLE = USE_FEATURE_PIDOF_SINGLE((1<<OPTBIT_SINGLE)) + 0,
  16         OPT_OMIT   = USE_FEATURE_PIDOF_OMIT(  (1<<OPTBIT_OMIT  )) + 0,
  17 };
  18
  19 int pidof_main(int argc, char **argv)
  20 {
  21         unsigned first = 1;
  22         unsigned fail = 1;
  23         unsigned opt;
  24 #if ENABLE_FEATURE_PIDOF_OMIT
  25         llist_t *omits = NULL; /* list of pids to omit */
  26         opt_complementary = "o::";
  27 #endif
  28
  29         /* do unconditional option parsing */
  30         opt = getopt32(argc, argv, ""
  31                         USE_FEATURE_PIDOF_SINGLE ("s")
  32                         USE_FEATURE_PIDOF_OMIT("o:", &omits));
  33
  34 #if ENABLE_FEATURE_PIDOF_OMIT
  35         /* fill omit list.  */
  36         {
  37                 char getppid_str[sizeof(int)*3 + 1];
  38                 llist_t * omits_p = omits;
  39                 while (omits_p) {
  40                         /* are we asked to exclude the parent's process ID?  */
  41                         if (!strncmp(omits_p->data, "%PPID", 5)) {
  42                                 llist_pop(&omits_p);
  43                                 snprintf(getppid_str, sizeof(getppid_str), "%u", (unsigned)getppid());
  44                                 llist_add_to(&omits_p, getppid_str);
  45                         }
  46                         omits_p = omits_p->link;
  47                 }
  48         }
  49 #endif
  50         /* Looks like everything is set to go.  */
  51         while (optind < argc) {
  52                 pid_t *pidList;
  53                 pid_t *pl;
  54
  55                 /* reverse the pidlist like GNU pidof does.  */
  56                 pidList = pidlist_reverse(find_pid_by_name(argv[optind]));
  57                 for (pl = pidList; *pl; pl++) {
  58                         SKIP_FEATURE_PIDOF_OMIT(const) unsigned omitted = 0;
  59 #if ENABLE_FEATURE_PIDOF_OMIT
  60                         if (opt & OPT_OMIT) {
  61                                 llist_t *omits_p = omits;
  62                                 while (omits_p) {
  63                                         if (xatoul(omits_p->data) == *pl) {
  64                                                 omitted = 1;
  65                                                 break;
  66                                         } else
  67                                                 omits_p = omits_p->link;
  68                                 }
  69                         }
  70 #endif
  71                         if (!omitted) {
  72                                 printf(" %u" + first, (unsigned)*pl);
  73                                 first = 0;
  74                         }
  75                         fail = (!ENABLE_FEATURE_PIDOF_OMIT && omitted);
  76
  77                         if (ENABLE_FEATURE_PIDOF_SINGLE && (opt & OPT_SINGLE))
  78                                 break;
  79                 }
  80                 free(pidList);
  81                 optind++;
  82         }
  83         putchar('\n');
  84
  85 #if ENABLE_FEATURE_PIDOF_OMIT
  86         if (ENABLE_FEATURE_CLEAN_UP)
  87                 llist_free(omits, NULL);
  88 #endif
  89         return fail ? EXIT_FAILURE : EXIT_SUCCESS;
  90 }