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
12enum {
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
19int pidof_main(int argc, char **argv);
20int 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	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}
87