util-linux/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         IF_FEATURE_PIDOF_SINGLE(OPTBIT_SINGLE,)
  14         IF_FEATURE_PIDOF_OMIT(  OPTBIT_OMIT  ,)
  15         OPT_SINGLE = IF_FEATURE_PIDOF_SINGLE((1<<OPTBIT_SINGLE)) + 0,
  16         OPT_OMIT   = IF_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 UNUSED_PARAM, char **argv)
  21 {
  22         unsigned first = 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(argv, ""
  31                         IF_FEATURE_PIDOF_SINGLE ("s")
  32                         IF_FEATURE_PIDOF_OMIT("o:", &omits));
  33
  34 #if ENABLE_FEATURE_PIDOF_OMIT
  35         /* fill omit list.  */
  36         {
  37                 llist_t *omits_p = omits;
  38                 while (1) {
  39                         omits_p = llist_find_str(omits_p, "%PPID");
  40                         if (!omits_p)
  41                                 break;
  42                         /* are we asked to exclude the parent's process ID?  */
  43                         omits_p->data = utoa((unsigned)getppid());
  44                 }
  45         }
  46 #endif
  47         /* Looks like everything is set to go.  */
  48         argv += optind;
  49         while (*argv) {
  50                 pid_t *pidList;
  51                 pid_t *pl;
  52
  53                 /* reverse the pidlist like GNU pidof does.  */
  54                 pidList = pidlist_reverse(find_pid_by_name(*argv));
  55                 for (pl = pidList; *pl; pl++) {
  56 #if ENABLE_FEATURE_PIDOF_OMIT
  57                         if (opt & OPT_OMIT) {
  58                                 llist_t *omits_p = omits;
  59                                 while (omits_p) {
  60                                         if (xatoul(omits_p->data) == (unsigned long)(*pl)) {
  61                                                 goto omitting;
  62                                         }
  63                                         omits_p = omits_p->link;
  64                                 }
  65                         }
  66 #endif
  67                         printf(" %u" + first, (unsigned)*pl);
  68                         first = 0;
  69                         if (ENABLE_FEATURE_PIDOF_SINGLE && (opt & OPT_SINGLE))
  70                                 break;
  71 #if ENABLE_FEATURE_PIDOF_OMIT
  72  omitting: ;
  73 #endif
  74                 }
  75                 free(pidList);
  76                 argv++;
  77         }
  78         if (!first)
  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 }