text: /* vi: set sw=4 ts=4: */
  /*
   * pidof implementation for busybox
   *
   * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
   *
   * Licensed under the GPL version 2, see the file LICENSE in this tarball.
   */
  
  #include "libbb.h"
  
  enum {
  	USE_FEATURE_PIDOF_SINGLE(OPTBIT_SINGLE,)
  	USE_FEATURE_PIDOF_OMIT(  OPTBIT_OMIT  ,)
  	OPT_SINGLE = USE_FEATURE_PIDOF_SINGLE((1<<OPTBIT_SINGLE)) + 0,
  	OPT_OMIT   = USE_FEATURE_PIDOF_OMIT(  (1<<OPTBIT_OMIT  )) + 0,
  };
  
  int pidof_main(int argc, char **argv);
  int pidof_main(int argc, char **argv)
  {
  	unsigned first = 1;
  	unsigned fail = 1;
  	unsigned opt;
  #if ENABLE_FEATURE_PIDOF_OMIT
  	llist_t *omits = NULL; /* list of pids to omit */
  	opt_complementary = "o::";
  #endif
  
  	/* do unconditional option parsing */
  	opt = getopt32(argc, argv, ""
  			USE_FEATURE_PIDOF_SINGLE ("s")
  			USE_FEATURE_PIDOF_OMIT("o:", &omits));
  
  #if ENABLE_FEATURE_PIDOF_OMIT
  	/* fill omit list.  */
  	{
  		char getppid_str[sizeof(int)*3 + 1];
  		llist_t * omits_p = omits;
  		while (omits_p) {
  			/* are we asked to exclude the parent's process ID?  */
  			if (!strncmp(omits_p->data, "%PPID", 5)) {
  				llist_pop(&omits_p);
  				snprintf(getppid_str, sizeof(getppid_str), "%u", (unsigned)getppid());
  				llist_add_to(&omits_p, getppid_str);
  			}
  			omits_p = omits_p->link;
  		}
  	}
  #endif
  	/* Looks like everything is set to go.  */
  	while (optind < argc) {
  		pid_t *pidList;
  		pid_t *pl;
  
  		/* reverse the pidlist like GNU pidof does.  */
  		pidList = pidlist_reverse(find_pid_by_name(argv[optind]));
  		for (pl = pidList; *pl; pl++) {
  			SKIP_FEATURE_PIDOF_OMIT(const) unsigned omitted = 0;
  #if ENABLE_FEATURE_PIDOF_OMIT
  			if (opt & OPT_OMIT) {
  				llist_t *omits_p = omits;
  				while (omits_p) {
  					if (xatoul(omits_p->data) == *pl) {
  						omitted = 1;
  						break;
  					} else
  						omits_p = omits_p->link;
  				}
  			}
  #endif
  			if (!omitted) {
  				printf(" %u" + first, (unsigned)*pl);
  				first = 0;
  			}
  			fail = (!ENABLE_FEATURE_PIDOF_OMIT && omitted);
  
  			if (ENABLE_FEATURE_PIDOF_SINGLE && (opt & OPT_SINGLE))
  				break;
  		}
  		free(pidList);
  		optind++;
  	}
  	putchar('\n');
  
  #if ENABLE_FEATURE_PIDOF_OMIT
  	if (ENABLE_FEATURE_CLEAN_UP)
  		llist_free(omits, NULL);
  #endif
  	return fail ? EXIT_FAILURE : EXIT_SUCCESS;
  }
  