busybox/debianutils/start_stop_daemon.c

/* vi: set sw=4 ts=4: */
/*
 * Mini start-stop-daemon implementation(s) for busybox
 *
 * Written by Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>,
 * Adapted for busybox David Kimdon <dwhedon@gordian.com>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

/*
This is how it is supposed to work:

start-stop-daemon [OPTIONS] [--start|--stop] [[--] arguments...]

One (only) of these must be given:
        -S,--start              Start
        -K,--stop               Stop

Search for matching processes.
If --stop is given, stop all matching processes (by sending a signal).
If --start is given, start a new process unless a matching process was found.

Options controlling process matching
(if multiple conditions are specified, all must match):
        -u,--user USERNAME|UID  Only consider this user's processes
        -n,--name PROCESS_NAME  Look for processes by matching PROCESS_NAME
                                with comm field in /proc/$PID/stat.
                                Only basename is compared:
                                "ntpd" == "./ntpd" == "/path/to/ntpd".
[TODO: can PROCESS_NAME be a full pathname? Should we require full match then
with /proc/$PID/exe or argv[0] (comm can't be matched, it never contains path)]
        -x,--exec EXECUTABLE    Look for processes that were started with this
                                command in /proc/$PID/cmdline.
                                Unlike -n, we match against the full path:
                                "ntpd" != "./ntpd" != "/path/to/ntpd"
        -p,--pidfile PID_FILE   Look for processes with PID from this file

Options which are valid for --start only:
        -x,--exec EXECUTABLE    Program to run (1st arg of execvp). Mandatory.
        -a,--startas NAME       argv[0] (defaults to EXECUTABLE)
        -b,--background         Put process into background
        -N,--nicelevel N        Add N to process' nice level
        -c,--chuid USER[:[GRP]] Change to specified user [and group]
        -m,--make-pidfile       Write PID to the pidfile
                                (both -m and -p must be given!)

Options which are valid for --stop only:
        -s,--signal SIG         Signal to send (default:TERM)
        -t,--test               Exit with status 0 if process is found
                                (we don't actually start or stop daemons)

Misc options:
        -o,--oknodo             Exit with status 0 if nothing is done
        -q,--quiet              Quiet
        -v,--verbose            Verbose
*/

#include <sys/resource.h>

/* Override ENABLE_FEATURE_PIDFILE */
#define WANT_PIDFILE 1
#include "libbb.h"

struct pid_list {
	struct pid_list *next;
	pid_t pid;
};

enum {
	CTX_STOP       = (1 <<  0),
	CTX_START      = (1 <<  1),
	OPT_BACKGROUND = (1 <<  2), // -b
	OPT_QUIET      = (1 <<  3), // -q
	OPT_TEST       = (1 <<  4), // -t
	OPT_MAKEPID    = (1 <<  5), // -m
	OPT_a          = (1 <<  6), // -a
	OPT_n          = (1 <<  7), // -n
	OPT_s          = (1 <<  8), // -s
	OPT_u          = (1 <<  9), // -u
	OPT_c          = (1 << 10), // -c
	OPT_x          = (1 << 11), // -x
	OPT_p          = (1 << 12), // -p
	OPT_OKNODO     = (1 << 13) * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -o
	OPT_VERBOSE    = (1 << 14) * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -v
	OPT_NICELEVEL  = (1 << 15) * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -N
};
#define QUIET (option_mask32 & OPT_QUIET)
#define TEST  (option_mask32 & OPT_TEST)

struct globals {
	struct pid_list *found;
	char *userspec;
	char *cmdname;
	char *execname;
	char *pidfile;
	int user_id;
	smallint signal_nr;
};
#define G (*(struct globals*)&bb_common_bufsiz1)
#define found             (G.found               )
#define userspec          (G.userspec            )
#define cmdname           (G.cmdname             )
#define execname          (G.execname            )
#define pidfile           (G.pidfile             )
#define user_id           (G.user_id             )
#define signal_nr         (G.signal_nr           )
#define INIT_G() do { \
	user_id = -1; \
	signal_nr = 15; \
} while (0)

#ifdef OLDER_VERSION_OF_X
/* -x,--exec EXECUTABLE
 * Look for processes with matching /proc/$PID/exe.
 * Match is performed using device+inode.
 */
static int pid_is_exec(pid_t pid)
{
	struct stat st;
	char buf[sizeof("/proc//exe") + sizeof(int)*3];

	sprintf(buf, "/proc/%u/exe", (unsigned)pid);
	if (stat(buf, &st) < 0)
		return 0;
	if (st.st_dev == execstat.st_dev
	 && st.st_ino == execstat.st_ino)
		return 1;
	return 0;
}
#endif

static int pid_is_exec(pid_t pid)
{
	ssize_t bytes;
	char buf[PATH_MAX];

	sprintf(buf, "/proc/%u/cmdline", (unsigned)pid);
	bytes = open_read_close(buf, buf, sizeof(buf) - 1);
	if (bytes > 0) {
		buf[bytes] = '\0';
		return strcmp(buf, execname) == 0;
	}
	return 0;
}

static int pid_is_name(pid_t pid)
{
	/* /proc/PID/stat is "PID (comm_15_bytes_max) ..." */
	char buf[32]; /* should be enough */
	char *p, *pe;

	sprintf(buf, "/proc/%u/stat", (unsigned)pid);
	if (open_read_close(buf, buf, sizeof(buf) - 1) < 0)
		return 0;
	buf[sizeof(buf) - 1] = '\0'; /* paranoia */
	p = strchr(buf, '(');
	if (!p)
		return 0;
	pe = strrchr(++p, ')');
	if (!pe)
		return 0;
	*pe = '\0';
	/* we require comm to match and to not be truncated */
	/* in Linux, if comm is 15 chars, it may be a truncated
	 * name, so we don't allow that to match */
	if (strlen(p) >= COMM_LEN - 1) /* COMM_LEN is 16 */
		return 0;
	return strcmp(p, cmdname) == 0;
}

static int pid_is_user(int pid)
{
	struct stat sb;
	char buf[sizeof("/proc/") + sizeof(int)*3];

	sprintf(buf, "/proc/%u", (unsigned)pid);
	if (stat(buf, &sb) != 0)
		return 0;
	return (sb.st_uid == (uid_t)user_id);
}

static void check(int pid)
{
	struct pid_list *p;

	if (execname && !pid_is_exec(pid)) {
		return;
	}
	if (cmdname && !pid_is_name(pid)) {
		return;
	}
	if (userspec && !pid_is_user(pid)) {
		return;
	}
	p = xmalloc(sizeof(*p));
	p->next = found;
	p->pid = pid;
	found = p;
}

static void do_pidfile(void)
{
	FILE *f;
	unsigned pid;

	f = fopen_for_read(pidfile);
	if (f) {
		if (fscanf(f, "%u", &pid) == 1)
			check(pid);
		fclose(f);
	} else if (errno != ENOENT)
		bb_perror_msg_and_die("open pidfile %s", pidfile);
}

static void do_procinit(void)
{
	DIR *procdir;
	struct dirent *entry;
	int pid;

	if (pidfile) {
		do_pidfile();
		return;
	}

	procdir = xopendir("/proc");

	pid = 0;
	while (1) {
		errno = 0; /* clear any previous error */
		entry = readdir(procdir);
// TODO: this check is too generic, it's better
// to check for exact errno(s) which mean that we got stale entry
		if (errno) /* Stale entry, process has died after opendir */
			continue;
		if (!entry) /* EOF, no more entries */
			break;
		pid = bb_strtou(entry->d_name, NULL, 10);
		if (errno) /* NaN */
			continue;
		check(pid);
	}
	closedir(procdir);
	if (!pid)
		bb_error_msg_and_die("nothing in /proc - not mounted?");
}

static int do_stop(void)
{
	char *what;
	struct pid_list *p;
	int killed = 0;

	if (cmdname) {
		if (ENABLE_FEATURE_CLEAN_UP) what = xstrdup(cmdname);
		if (!ENABLE_FEATURE_CLEAN_UP) what = cmdname;
	} else if (execname) {
		if (ENABLE_FEATURE_CLEAN_UP) what = xstrdup(execname);
		if (!ENABLE_FEATURE_CLEAN_UP) what = execname;
	} else if (pidfile) {
		what = xasprintf("process in pidfile '%s'", pidfile);
	} else if (userspec) {
		what = xasprintf("process(es) owned by '%s'", userspec);
	} else {
		bb_error_msg_and_die("internal error, please report");
	}

	if (!found) {
		if (!QUIET)
			printf("no %s found; none killed\n", what);
		killed = -1;
		goto ret;
	}
	for (p = found; p; p = p->next) {
		if (TEST || kill(p->pid, signal_nr) == 0) {
			killed++;
		} else {
			p->pid = 0;
			bb_perror_msg("warning: killing process %u", (unsigned)p->pid);
		}
	}
	if (!QUIET && killed) {
		printf("stopped %s (pid", what);
		for (p = found; p; p = p->next)
			if (p->pid)
				printf(" %u", (unsigned)p->pid);
		puts(")");
	}
 ret:
	if (ENABLE_FEATURE_CLEAN_UP)
		free(what);
	return killed;
}

#if ENABLE_FEATURE_START_STOP_DAEMON_LONG_OPTIONS
static const char start_stop_daemon_longopts[] ALIGN1 =
	"stop\0"         No_argument       "K"
	"start\0"        No_argument       "S"
	"background\0"   No_argument       "b"
	"quiet\0"        No_argument       "q"
	"test\0"         No_argument       "t"
	"make-pidfile\0" No_argument       "m"
#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
	"oknodo\0"       No_argument       "o"
	"verbose\0"      No_argument       "v"
	"nicelevel\0"    Required_argument "N"
#endif
	"startas\0"      Required_argument "a"
	"name\0"         Required_argument "n"
	"signal\0"       Required_argument "s"
	"user\0"         Required_argument "u"
	"chuid\0"        Required_argument "c"
	"exec\0"         Required_argument "x"
	"pidfile\0"      Required_argument "p"
#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
	"retry\0"        Required_argument "R"
#endif
	;
#endif

int start_stop_daemon_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int start_stop_daemon_main(int argc UNUSED_PARAM, char **argv)
{
	unsigned opt;
	char *signame;
	char *startas;
	char *chuid;
#ifdef OLDER_VERSION_OF_X
	struct stat execstat;
#endif
#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
//	char *retry_arg = NULL;
//	int retries = -1;
	char *opt_N;
#endif

	INIT_G();

#if ENABLE_FEATURE_START_STOP_DAEMON_LONG_OPTIONS
	applet_long_options = start_stop_daemon_longopts;
#endif

	/* -K or -S is required; they are mutually exclusive */
	/* -p is required if -m is given */
	/* -xpun (at least one) is required if -K is given */
	/* -xa (at least one) is required if -S is given */
	/* -q turns off -v */
	opt_complementary = "K:S:K--S:S--K:m?p:K?xpun:S?xa"
		IF_FEATURE_START_STOP_DAEMON_FANCY("q-v");
	opt = getopt32(argv, "KSbqtma:n:s:u:c:x:p:"
		IF_FEATURE_START_STOP_DAEMON_FANCY("ovN:R:"),
		&startas, &cmdname, &signame, &userspec, &chuid, &execname, &pidfile
		IF_FEATURE_START_STOP_DAEMON_FANCY(,&opt_N)
		/* We accept and ignore -R <param> / --retry <param> */
		IF_FEATURE_START_STOP_DAEMON_FANCY(,NULL)
	);

	if (opt & OPT_s) {
		signal_nr = get_signum(signame);
		if (signal_nr < 0) bb_show_usage();
	}

	if (!(opt & OPT_a))
		startas = execname;
	if (!execname) /* in case -a is given and -x is not */
		execname = startas;

//	IF_FEATURE_START_STOP_DAEMON_FANCY(
//		if (retry_arg)
//			retries = xatoi_u(retry_arg);
//	)
	//argc -= optind;
	argv += optind;

	if (userspec) {
		user_id = bb_strtou(userspec, NULL, 10);
		if (errno)
			user_id = xuname2uid(userspec);
	}
	/* Both start and stop need to know current processes */
	do_procinit();

	if (opt & CTX_STOP) {
		int i = do_stop();
		return (opt & OPT_OKNODO) ? 0 : (i <= 0);
	}

	if (found) {
		if (!QUIET)
			printf("%s is already running\n%u\n", execname, (unsigned)found->pid);
		return !(opt & OPT_OKNODO);
	}

#ifdef OLDER_VERSION_OF_X
	if (execname)
		xstat(execname, &execstat);
#endif

	*--argv = startas;
	if (opt & OPT_BACKGROUND) {
#if BB_MMU
		bb_daemonize(DAEMON_DEVNULL_STDIO + DAEMON_CLOSE_EXTRA_FDS);
		/* DAEMON_DEVNULL_STDIO is superfluous -
		 * it's always done by bb_daemonize() */
#else
		pid_t pid = vfork();
		if (pid < 0) /* error */
			bb_perror_msg_and_die("vfork");
		if (pid != 0) {
			/* parent */
			/* why _exit? the child may have changed the stack,
			 * so "return 0" may do bad things */
			_exit(EXIT_SUCCESS);
		}
		/* Child */
		setsid(); /* detach from controlling tty */
		/* Redirect stdio to /dev/null, close extra FDs.
		 * We do not actually daemonize because of DAEMON_ONLY_SANITIZE */
		bb_daemonize_or_rexec(DAEMON_DEVNULL_STDIO
			+ DAEMON_CLOSE_EXTRA_FDS
			+ DAEMON_ONLY_SANITIZE,
			NULL /* argv, unused */ );
#endif
	}
	if (opt & OPT_MAKEPID) {
		/* User wants _us_ to make the pidfile */
		write_pidfile(pidfile);
	}
	if (opt & OPT_c) {
		struct bb_uidgid_t ugid = { -1, -1 };
		parse_chown_usergroup_or_die(&ugid, chuid);
		if (ugid.gid != (gid_t) -1) xsetgid(ugid.gid);
		if (ugid.uid != (uid_t) -1) xsetuid(ugid.uid);
	}
#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
	if (opt & OPT_NICELEVEL) {
		/* Set process priority */
		int prio = getpriority(PRIO_PROCESS, 0) + xatoi_range(opt_N, INT_MIN/2, INT_MAX/2);
		if (setpriority(PRIO_PROCESS, 0, prio) < 0) {
			bb_perror_msg_and_die("setpriority(%d)", prio);
		}
	}
#endif
	execvp(startas, argv);
	bb_perror_msg_and_die("can't start %s", startas);
}
1	/* vi: set sw=4 ts=4: */
2	/*
3	* Mini start-stop-daemon implementation(s) for busybox
4	*
5	* Written by Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>,
6	* Adapted for busybox David Kimdon <dwhedon@gordian.com>
7	*
8	* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
9	*/
10
11	/*
12	This is how it is supposed to work:
13
14	start-stop-daemon [OPTIONS] [--start\|--stop] [[--] arguments...]
15
16	One (only) of these must be given:
17	-S,--start Start
18	-K,--stop Stop
19
20	Search for matching processes.
21	If --stop is given, stop all matching processes (by sending a signal).
22	If --start is given, start a new process unless a matching process was found.
23
24	Options controlling process matching
25	(if multiple conditions are specified, all must match):
26	-u,--user USERNAME\|UID Only consider this user's processes
27	-n,--name PROCESS_NAME Look for processes by matching PROCESS_NAME
28	with comm field in /proc/$PID/stat.
29	Only basename is compared:
30	"ntpd" == "./ntpd" == "/path/to/ntpd".
31	[TODO: can PROCESS_NAME be a full pathname? Should we require full match then
32	with /proc/$PID/exe or argv[0] (comm can't be matched, it never contains path)]
33	-x,--exec EXECUTABLE Look for processes that were started with this
34	command in /proc/$PID/cmdline.
35	Unlike -n, we match against the full path:
36	"ntpd" != "./ntpd" != "/path/to/ntpd"
37	-p,--pidfile PID_FILE Look for processes with PID from this file
38
39	Options which are valid for --start only:
40	-x,--exec EXECUTABLE Program to run (1st arg of execvp). Mandatory.
41	-a,--startas NAME argv[0] (defaults to EXECUTABLE)
42	-b,--background Put process into background
43	-N,--nicelevel N Add N to process' nice level
44	-c,--chuid USER[:[GRP]] Change to specified user [and group]
45	-m,--make-pidfile Write PID to the pidfile
46	(both -m and -p must be given!)
47
48	Options which are valid for --stop only:
49	-s,--signal SIG Signal to send (default:TERM)
50	-t,--test Exit with status 0 if process is found
51	(we don't actually start or stop daemons)
52
53	Misc options:
54	-o,--oknodo Exit with status 0 if nothing is done
55	-q,--quiet Quiet
56	-v,--verbose Verbose
57	*/
58
59	#include <sys/resource.h>
60
61	/* Override ENABLE_FEATURE_PIDFILE */
62	#define WANT_PIDFILE 1
63	#include "libbb.h"
64
65	struct pid_list {
66	struct pid_list *next;
67	pid_t pid;
68	};
69
70	enum {
71	CTX_STOP = (1 << 0),
72	CTX_START = (1 << 1),
73	OPT_BACKGROUND = (1 << 2), // -b
74	OPT_QUIET = (1 << 3), // -q
75	OPT_TEST = (1 << 4), // -t
76	OPT_MAKEPID = (1 << 5), // -m
77	OPT_a = (1 << 6), // -a
78	OPT_n = (1 << 7), // -n
79	OPT_s = (1 << 8), // -s
80	OPT_u = (1 << 9), // -u
81	OPT_c = (1 << 10), // -c
82	OPT_x = (1 << 11), // -x
83	OPT_p = (1 << 12), // -p
84	OPT_OKNODO = (1 << 13) * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -o
85	OPT_VERBOSE = (1 << 14) * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -v
86	OPT_NICELEVEL = (1 << 15) * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -N
87	};
88	#define QUIET (option_mask32 & OPT_QUIET)
89	#define TEST (option_mask32 & OPT_TEST)
90
91	struct globals {
92	struct pid_list *found;
93	char *userspec;
94	char *cmdname;
95	char *execname;
96	char *pidfile;
97	int user_id;
98	smallint signal_nr;
99	};
100	#define G ((struct globals)&bb_common_bufsiz1)
101	#define found (G.found )
102	#define userspec (G.userspec )
103	#define cmdname (G.cmdname )
104	#define execname (G.execname )
105	#define pidfile (G.pidfile )
106	#define user_id (G.user_id )
107	#define signal_nr (G.signal_nr )
108	#define INIT_G() do { \
109	user_id = -1; \
110	signal_nr = 15; \
111	} while (0)
112
113	#ifdef OLDER_VERSION_OF_X
114	/* -x,--exec EXECUTABLE
115	* Look for processes with matching /proc/$PID/exe.
116	* Match is performed using device+inode.
117	*/
118	static int pid_is_exec(pid_t pid)
119	{
120	struct stat st;
121	char buf[sizeof("/proc//exe") + sizeof(int)*3];
122
123	sprintf(buf, "/proc/%u/exe", (unsigned)pid);
124	if (stat(buf, &st) < 0)
125	return 0;
126	if (st.st_dev == execstat.st_dev
127	&& st.st_ino == execstat.st_ino)
128	return 1;
129	return 0;
130	}
131	#endif
132
133	static int pid_is_exec(pid_t pid)
134	{
135	ssize_t bytes;
136	char buf[PATH_MAX];
137
138	sprintf(buf, "/proc/%u/cmdline", (unsigned)pid);
139	bytes = open_read_close(buf, buf, sizeof(buf) - 1);
140	if (bytes > 0) {
141	buf[bytes] = '\0';
142	return strcmp(buf, execname) == 0;
143	}
144	return 0;
145	}
146
147	static int pid_is_name(pid_t pid)
148	{
149	/* /proc/PID/stat is "PID (comm_15_bytes_max) ..." */
150	char buf[32]; /* should be enough */
151	char p, pe;
152
153	sprintf(buf, "/proc/%u/stat", (unsigned)pid);
154	if (open_read_close(buf, buf, sizeof(buf) - 1) < 0)
155	return 0;
156	buf[sizeof(buf) - 1] = '\0'; /* paranoia */
157	p = strchr(buf, '(');
158	if (!p)
159	return 0;
160	pe = strrchr(++p, ')');
161	if (!pe)
162	return 0;
163	*pe = '\0';
164	/* we require comm to match and to not be truncated */
165	/* in Linux, if comm is 15 chars, it may be a truncated
166	* name, so we don't allow that to match */
167	if (strlen(p) >= COMM_LEN - 1) /* COMM_LEN is 16 */
168	return 0;
169	return strcmp(p, cmdname) == 0;
170	}
171
172	static int pid_is_user(int pid)
173	{
174	struct stat sb;
175	char buf[sizeof("/proc/") + sizeof(int)*3];
176
177	sprintf(buf, "/proc/%u", (unsigned)pid);
178	if (stat(buf, &sb) != 0)
179	return 0;
180	return (sb.st_uid == (uid_t)user_id);
181	}
182
183	static void check(int pid)
184	{
185	struct pid_list *p;
186
187	if (execname && !pid_is_exec(pid)) {
188	return;
189	}
190	if (cmdname && !pid_is_name(pid)) {
191	return;
192	}
193	if (userspec && !pid_is_user(pid)) {
194	return;
195	}
196	p = xmalloc(sizeof(*p));
197	p->next = found;
198	p->pid = pid;
199	found = p;
200	}
201
202	static void do_pidfile(void)
203	{
204	FILE *f;
205	unsigned pid;
206
207	f = fopen_for_read(pidfile);
208	if (f) {
209	if (fscanf(f, "%u", &pid) == 1)
210	check(pid);
211	fclose(f);
212	} else if (errno != ENOENT)
213	bb_perror_msg_and_die("open pidfile %s", pidfile);
214	}
215
216	static void do_procinit(void)
217	{
218	DIR *procdir;
219	struct dirent *entry;
220	int pid;
221
222	if (pidfile) {
223	do_pidfile();
224	return;
225	}
226
227	procdir = xopendir("/proc");
228
229	pid = 0;
230	while (1) {
231	errno = 0; /* clear any previous error */
232	entry = readdir(procdir);
233	// TODO: this check is too generic, it's better
234	// to check for exact errno(s) which mean that we got stale entry
235	if (errno) /* Stale entry, process has died after opendir */
236	continue;
237	if (!entry) /* EOF, no more entries */
238	break;
239	pid = bb_strtou(entry->d_name, NULL, 10);
240	if (errno) /* NaN */
241	continue;
242	check(pid);
243	}
244	closedir(procdir);
245	if (!pid)
246	bb_error_msg_and_die("nothing in /proc - not mounted?");
247	}
248
249	static int do_stop(void)
250	{
251	char *what;
252	struct pid_list *p;
253	int killed = 0;
254
255	if (cmdname) {
256	if (ENABLE_FEATURE_CLEAN_UP) what = xstrdup(cmdname);
257	if (!ENABLE_FEATURE_CLEAN_UP) what = cmdname;
258	} else if (execname) {
259	if (ENABLE_FEATURE_CLEAN_UP) what = xstrdup(execname);
260	if (!ENABLE_FEATURE_CLEAN_UP) what = execname;
261	} else if (pidfile) {
262	what = xasprintf("process in pidfile '%s'", pidfile);
263	} else if (userspec) {
264	what = xasprintf("process(es) owned by '%s'", userspec);
265	} else {
266	bb_error_msg_and_die("internal error, please report");
267	}
268
269	if (!found) {
270	if (!QUIET)
271	printf("no %s found; none killed\n", what);
272	killed = -1;
273	goto ret;
274	}
275	for (p = found; p; p = p->next) {
276	if (TEST \|\| kill(p->pid, signal_nr) == 0) {
277	killed++;
278	} else {
279	p->pid = 0;
280	bb_perror_msg("warning: killing process %u", (unsigned)p->pid);
281	}
282	}
283	if (!QUIET && killed) {
284	printf("stopped %s (pid", what);
285	for (p = found; p; p = p->next)
286	if (p->pid)
287	printf(" %u", (unsigned)p->pid);
288	puts(")");
289	}
290	ret:
291	if (ENABLE_FEATURE_CLEAN_UP)
292	free(what);
293	return killed;
294	}
295
296	#if ENABLE_FEATURE_START_STOP_DAEMON_LONG_OPTIONS
297	static const char start_stop_daemon_longopts[] ALIGN1 =
298	"stop\0" No_argument "K"
299	"start\0" No_argument "S"
300	"background\0" No_argument "b"
301	"quiet\0" No_argument "q"
302	"test\0" No_argument "t"
303	"make-pidfile\0" No_argument "m"
304	#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
305	"oknodo\0" No_argument "o"
306	"verbose\0" No_argument "v"
307	"nicelevel\0" Required_argument "N"
308	#endif
309	"startas\0" Required_argument "a"
310	"name\0" Required_argument "n"
311	"signal\0" Required_argument "s"
312	"user\0" Required_argument "u"
313	"chuid\0" Required_argument "c"
314	"exec\0" Required_argument "x"
315	"pidfile\0" Required_argument "p"
316	#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
317	"retry\0" Required_argument "R"
318	#endif
319	;
320	#endif
321
322	int start_stop_daemon_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
323	int start_stop_daemon_main(int argc UNUSED_PARAM, char **argv)
324	{
325	unsigned opt;
326	char *signame;
327	char *startas;
328	char *chuid;
329	#ifdef OLDER_VERSION_OF_X
330	struct stat execstat;
331	#endif
332	#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
333	// char *retry_arg = NULL;
334	// int retries = -1;
335	char *opt_N;
336	#endif
337
338	INIT_G();
339
340	#if ENABLE_FEATURE_START_STOP_DAEMON_LONG_OPTIONS
341	applet_long_options = start_stop_daemon_longopts;
342	#endif
343
344	/* -K or -S is required; they are mutually exclusive */
345	/* -p is required if -m is given */
346	/* -xpun (at least one) is required if -K is given */
347	/* -xa (at least one) is required if -S is given */
348	/* -q turns off -v */
349	opt_complementary = "K:S:K--S:S--K:m?p:K?xpun:S?xa"
350	IF_FEATURE_START_STOP_DAEMON_FANCY("q-v");
351	opt = getopt32(argv, "KSbqtma:n:s:u:c:x:p:"
352	IF_FEATURE_START_STOP_DAEMON_FANCY("ovN:R:"),
353	&startas, &cmdname, &signame, &userspec, &chuid, &execname, &pidfile
354	IF_FEATURE_START_STOP_DAEMON_FANCY(,&opt_N)
355	/* We accept and ignore -R <param> / --retry <param> */
356	IF_FEATURE_START_STOP_DAEMON_FANCY(,NULL)
357	);
358
359	if (opt & OPT_s) {
360	signal_nr = get_signum(signame);
361	if (signal_nr < 0) bb_show_usage();
362	}
363
364	if (!(opt & OPT_a))
365	startas = execname;
366	if (!execname) /* in case -a is given and -x is not */
367	execname = startas;
368
369	// IF_FEATURE_START_STOP_DAEMON_FANCY(
370	// if (retry_arg)
371	// retries = xatoi_u(retry_arg);
372	// )
373	//argc -= optind;
374	argv += optind;
375
376	if (userspec) {
377	user_id = bb_strtou(userspec, NULL, 10);
378	if (errno)
379	user_id = xuname2uid(userspec);
380	}
381	/* Both start and stop need to know current processes */
382	do_procinit();
383
384	if (opt & CTX_STOP) {
385	int i = do_stop();
386	return (opt & OPT_OKNODO) ? 0 : (i <= 0);
387	}
388
389	if (found) {
390	if (!QUIET)
391	printf("%s is already running\n%u\n", execname, (unsigned)found->pid);
392	return !(opt & OPT_OKNODO);
393	}
394
395	#ifdef OLDER_VERSION_OF_X
396	if (execname)
397	xstat(execname, &execstat);
398	#endif
399
400	*--argv = startas;
401	if (opt & OPT_BACKGROUND) {
402	#if BB_MMU
403	bb_daemonize(DAEMON_DEVNULL_STDIO + DAEMON_CLOSE_EXTRA_FDS);
404	/* DAEMON_DEVNULL_STDIO is superfluous -
405	* it's always done by bb_daemonize() */
406	#else
407	pid_t pid = vfork();
408	if (pid < 0) /* error */
409	bb_perror_msg_and_die("vfork");
410	if (pid != 0) {
411	/* parent */
412	/* why _exit? the child may have changed the stack,
413	* so "return 0" may do bad things */
414	_exit(EXIT_SUCCESS);
415	}
416	/* Child */
417	setsid(); /* detach from controlling tty */
418	/* Redirect stdio to /dev/null, close extra FDs.
419	* We do not actually daemonize because of DAEMON_ONLY_SANITIZE */
420	bb_daemonize_or_rexec(DAEMON_DEVNULL_STDIO
421	+ DAEMON_CLOSE_EXTRA_FDS
422	+ DAEMON_ONLY_SANITIZE,
423	NULL /* argv, unused */ );
424	#endif
425	}
426	if (opt & OPT_MAKEPID) {
427	/* User wants _us_ to make the pidfile */
428	write_pidfile(pidfile);
429	}
430	if (opt & OPT_c) {
431	struct bb_uidgid_t ugid = { -1, -1 };
432	parse_chown_usergroup_or_die(&ugid, chuid);
433	if (ugid.gid != (gid_t) -1) xsetgid(ugid.gid);
434	if (ugid.uid != (uid_t) -1) xsetuid(ugid.uid);
435	}
436	#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
437	if (opt & OPT_NICELEVEL) {
438	/* Set process priority */
439	int prio = getpriority(PRIO_PROCESS, 0) + xatoi_range(opt_N, INT_MIN/2, INT_MAX/2);
440	if (setpriority(PRIO_PROCESS, 0, prio) < 0) {
441	bb_perror_msg_and_die("setpriority(%d)", prio);
442	}
443	}
444	#endif
445	execvp(startas, argv);
446	bb_perror_msg_and_die("can't start %s", startas);
447	}