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 int pidof_main(int argc, char **argv)
  21 {
  22         unsigned first = 1;
  23         unsigned fail = 1;
  24         unsigned opt;
  25 #if ENABLE_FEATURE_PIDOF_OMIT
  26         llist_t *omits = NULL; /* list of pids to omit */
  27         opt_complementary = "o::";
  28 #endif
  29
  30         /* do unconditional option parsing */
  31         opt = getopt32(argc, argv, ""
  32                         USE_FEATURE_PIDOF_SINGLE ("s")
  33                         USE_FEATURE_PIDOF_OMIT("o:", &omits));
  34
  35 #if ENABLE_FEATURE_PIDOF_OMIT
  36         /* fill omit list.  */
  37         {
  38                 char getppid_str[sizeof(int)*3 + 1];
  39                 llist_t * omits_p = omits;
  40                 while (omits_p) {
  41                         /* are we asked to exclude the parent's process ID?  */
  42                         if (!strncmp(omits_p->data, "%PPID", 5)) {
  43                                 llist_pop(&omits_p);
  44                                 snprintf(getppid_str, sizeof(getppid_str), "%u", (unsigned)getppid());
  45                                 llist_add_to(&omits_p, getppid_str);
  46                         }
  47                         omits_p = omits_p->link;
  48                 }
  49         }
  50 #endif
  51         /* Looks like everything is set to go.  */
  52         while (optind < argc) {
  53                 pid_t *pidList;
  54                 pid_t *pl;
  55
  56                 /* reverse the pidlist like GNU pidof does.  */
  57                 pidList = pidlist_reverse(find_pid_by_name(argv[optind]));
  58                 for (pl = pidList; *pl; pl++) {
  59                         SKIP_FEATURE_PIDOF_OMIT(const) unsigned omitted = 0;
  60 #if ENABLE_FEATURE_PIDOF_OMIT
  61                         if (opt & OPT_OMIT) {
  62                                 llist_t *omits_p = omits;
  63                                 while (omits_p) {
  64                                         if (xatoul(omits_p->data) == *pl) {
  65                                                 omitted = 1;
  66                                                 break;
  67                                         } else
  68                                                 omits_p = omits_p->link;
  69                                 }
  70                         }
  71 #endif
  72                         if (!omitted) {
  73                                 printf(" %u" + first, (unsigned)*pl);
  74                                 first = 0;
  75                         }
  76                         fail = (!ENABLE_FEATURE_PIDOF_OMIT && omitted);
  77
  78                         if (ENABLE_FEATURE_PIDOF_SINGLE && (opt & OPT_SINGLE))
  79                                 break;
  80                 }
  81                 free(pidList);
  82                 optind++;
  83         }
  84         putchar('\n');
  85
  86 #if ENABLE_FEATURE_PIDOF_OMIT
  87         if (ENABLE_FEATURE_CLEAN_UP)
  88                 llist_free(omits, NULL);
  89 #endif
  90         return fail ? EXIT_FAILURE : EXIT_SUCCESS;
  91 }