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 GPLv2, see file LICENSE in this source tree.
   8  */
   9
  10 //usage:#if (ENABLE_FEATURE_PIDOF_SINGLE || ENABLE_FEATURE_PIDOF_OMIT)
  11 //usage:#define pidof_trivial_usage
  12 //usage:       "[OPTIONS] [NAME]..."
  13 //usage:#define USAGE_PIDOF "\n"
  14 //usage:#else
  15 //usage:#define pidof_trivial_usage
  16 //usage:       "[NAME]..."
  17 //usage:#define USAGE_PIDOF /* none */
  18 //usage:#endif
  19 //usage:#define pidof_full_usage "\n\n"
  20 //usage:       "List PIDs of all processes with names that match NAMEs"
  21 //usage:        USAGE_PIDOF
  22 //usage:        IF_FEATURE_PIDOF_SINGLE(
  23 //usage:     "\n        -s      Show only one PID"
  24 //usage:        )
  25 //usage:        IF_FEATURE_PIDOF_OMIT(
  26 //usage:     "\n        -o PID  Omit given pid"
  27 //usage:     "\n                Use %PPID to omit pid of pidof's parent"
  28 //usage:        )
  29 //usage:
  30 //usage:#define pidof_example_usage
  31 //usage:       "$ pidof init\n"
  32 //usage:       "1\n"
  33 //usage:        IF_FEATURE_PIDOF_OMIT(
  34 //usage:       "$ pidof /bin/sh\n20351 5973 5950\n")
  35 //usage:        IF_FEATURE_PIDOF_OMIT(
  36 //usage:       "$ pidof /bin/sh -o %PPID\n20351 5950")
  37
  38 #include "libbb.h"
  39
  40 enum {
  41         IF_FEATURE_PIDOF_SINGLE(OPTBIT_SINGLE,)
  42         IF_FEATURE_PIDOF_OMIT(  OPTBIT_OMIT  ,)
  43         OPT_SINGLE = IF_FEATURE_PIDOF_SINGLE((1<<OPTBIT_SINGLE)) + 0,
  44         OPT_OMIT   = IF_FEATURE_PIDOF_OMIT(  (1<<OPTBIT_OMIT  )) + 0,
  45 };
  46
  47 int pidof_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  48 int pidof_main(int argc UNUSED_PARAM, char **argv)
  49 {
  50         unsigned first = 1;
  51         unsigned opt;
  52 #if ENABLE_FEATURE_PIDOF_OMIT
  53         llist_t *omits = NULL; /* list of pids to omit */
  54         opt_complementary = "o::";
  55 #endif
  56
  57         /* do unconditional option parsing */
  58         opt = getopt32(argv, ""
  59                         IF_FEATURE_PIDOF_SINGLE ("s")
  60                         IF_FEATURE_PIDOF_OMIT("o:", &omits));
  61
  62 #if ENABLE_FEATURE_PIDOF_OMIT
  63         /* fill omit list.  */
  64         {
  65                 llist_t *omits_p = omits;
  66                 while (1) {
  67                         omits_p = llist_find_str(omits_p, "%PPID");
  68                         if (!omits_p)
  69                                 break;
  70                         /* are we asked to exclude the parent's process ID?  */
  71                         omits_p->data = utoa((unsigned)getppid());
  72                 }
  73         }
  74 #endif
  75         /* Looks like everything is set to go.  */
  76         argv += optind;
  77         while (*argv) {
  78                 pid_t *pidList;
  79                 pid_t *pl;
  80
  81                 /* reverse the pidlist like GNU pidof does.  */
  82                 pidList = pidlist_reverse(find_pid_by_name(*argv));
  83                 for (pl = pidList; *pl; pl++) {
  84 #if ENABLE_FEATURE_PIDOF_OMIT
  85                         if (opt & OPT_OMIT) {
  86                                 llist_t *omits_p = omits;
  87                                 while (omits_p) {
  88                                         if (xatoul(omits_p->data) == (unsigned long)(*pl)) {
  89                                                 goto omitting;
  90                                         }
  91                                         omits_p = omits_p->link;
  92                                 }
  93                         }
  94 #endif
  95                         printf(" %u" + first, (unsigned)*pl);
  96                         first = 0;
  97                         if (ENABLE_FEATURE_PIDOF_SINGLE && (opt & OPT_SINGLE))
  98                                 break;
  99 #if ENABLE_FEATURE_PIDOF_OMIT
 100  omitting: ;
 101 #endif
 102                 }
 103                 free(pidList);
 104                 argv++;
 105         }
 106         if (!first)
 107                 bb_putchar('\n');
 108
 109 #if ENABLE_FEATURE_PIDOF_OMIT
 110         if (ENABLE_FEATURE_CLEAN_UP)
 111                 llist_free(omits, NULL);
 112 #endif
 113         return first; /* 1 (failure) - no processes found */
 114 }