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 "libbb.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) MAIN_EXTERNALLY_VISIBLE;
  20 int pidof_main(int argc, char **argv)
  21 {
  22         unsigned first = 1;
  23         unsigned opt;
  24 #if ENABLE_FEATURE_PIDOF_OMIT
  25         char ppid_str[sizeof(int)*3 + 1];
  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(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                 llist_t *omits_p = omits;
  39                 while (omits_p) {
  40                         /* are we asked to exclude the parent's process ID?  */
  41                         if (strcmp(omits_p->data, "%PPID") == 0) {
  42                                 sprintf(ppid_str, "%u", (unsigned)getppid());
  43                                 omits_p->data = ppid_str;
  44                         }
  45                         omits_p = omits_p->link;
  46                 }
  47         }
  48 #endif
  49         /* Looks like everything is set to go.  */
  50         while (optind < argc) {
  51                 pid_t *pidList;
  52                 pid_t *pl;
  53
  54                 /* reverse the pidlist like GNU pidof does.  */
  55                 pidList = pidlist_reverse(find_pid_by_name(argv[optind]));
  56                 for (pl = pidList; *pl; pl++) {
  57 #if ENABLE_FEATURE_PIDOF_OMIT
  58                         if (opt & OPT_OMIT) {
  59                                 llist_t *omits_p = omits;
  60                                 while (omits_p) {
  61                                         if (xatoul(omits_p->data) == *pl) {
  62                                                 goto omitting;
  63                                         }
  64                                         omits_p = omits_p->link;
  65                                 }
  66                         }
  67 #endif
  68                         printf(" %u" + first, (unsigned)*pl);
  69                         first = 0;
  70                         if (ENABLE_FEATURE_PIDOF_SINGLE && (opt & OPT_SINGLE))
  71                                 break;
  72 #if ENABLE_FEATURE_PIDOF_OMIT
  73  omitting: ;
  74 #endif
  75                 }
  76                 free(pidList);
  77                 optind++;
  78         }
  79         bb_putchar('\n');
  80
  81 #if ENABLE_FEATURE_PIDOF_OMIT
  82         if (ENABLE_FEATURE_CLEAN_UP)
  83                 llist_free(omits, NULL);
  84 #endif
  85         return first; /* 1 (failure) - no processes found */
  86 }