1 /* vi: set sw=4 ts=4: */
3 * Mini start-stop-daemon implementation(s) for busybox
5 * Written by Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>,
6 * Adapted for busybox David Kimdon <dwhedon@gordian.com>
8 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
11 /* NB: we have a problem here with /proc/NN/exe usage, similar to
12 * one fixed in killall/pidof */
15 #include <sys/resource.h>
17 /* Override ENABLE_FEATURE_PIDFILE */
18 #define WANT_PIDFILE 1
21 static int signal_nr = 15;
22 static int user_id = -1;
23 static char *userspec;
25 static char *execname;
27 static smallint quiet;
30 struct pid_list *next;
34 static struct pid_list *found;
36 static int pid_is_exec(pid_t pid, const char *name)
38 char buf[sizeof("/proc//exe") + sizeof(int)*3];
42 sprintf(buf, "/proc/%u/exe", pid);
44 execbuf = xzalloc(n + 1);
45 readlink(buf, execbuf, n);
47 /* if readlink fails, execbuf still contains "" */
48 n = strcmp(execbuf, name);
49 if (ENABLE_FEATURE_CLEAN_UP)
51 return !n; /* nonzero (true) if execbuf == name */
54 static int pid_is_user(int pid, int uid)
57 char buf[sizeof("/proc/") + sizeof(int)*3];
59 sprintf(buf, "/proc/%u", pid);
60 if (stat(buf, &sb) != 0)
62 return (sb.st_uid == uid);
65 static int pid_is_cmd(pid_t pid, const char *name)
67 char fname[sizeof("/proc//stat") + sizeof(int)*3];
71 sprintf(fname, "/proc/%u/stat", pid);
72 buf = xmalloc_open_read_close(fname, NULL);
74 char *p = strchr(buf, '(');
76 char *pe = strrchr(++p, ')');
87 static void check(int pid)
91 if (execname && !pid_is_exec(pid, execname)) {
94 if (userspec && !pid_is_user(pid, user_id)) {
97 if (cmdname && !pid_is_cmd(pid, cmdname)) {
100 p = xmalloc(sizeof(*p));
106 static void do_pidfile(void)
111 f = fopen(pidfile, "r");
113 if (fscanf(f, "%u", &pid) == 1)
116 } else if (errno != ENOENT)
117 bb_perror_msg_and_die("open pidfile %s", pidfile);
120 static void do_procinit(void)
123 struct dirent *entry;
131 procdir = xopendir("/proc");
134 while ((entry = readdir(procdir)) != NULL) {
135 pid = bb_strtou(entry->d_name, NULL, 10);
143 bb_error_msg_and_die("nothing in /proc - not mounted?");
146 static int do_stop(void)
155 if (ENABLE_FEATURE_CLEAN_UP) what = xstrdup(cmdname);
156 if (!ENABLE_FEATURE_CLEAN_UP) what = cmdname;
157 } else if (execname) {
158 if (ENABLE_FEATURE_CLEAN_UP) what = xstrdup(execname);
159 if (!ENABLE_FEATURE_CLEAN_UP) what = execname;
161 what = xasprintf("process in pidfile '%s'", pidfile);
163 what = xasprintf("process(es) owned by '%s'", userspec);
165 bb_error_msg_and_die("internal error, please report");
169 printf("no %s found; none killed\n", what);
173 for (p = found; p; p = p->next) {
174 if (kill(p->pid, signal_nr) == 0) {
178 bb_perror_msg("warning: killing process %u", p->pid);
181 if (!quiet && killed) {
182 printf("stopped %s (pid", what);
183 for (p = found; p; p = p->next)
185 printf(" %u", - p->pid);
189 if (ENABLE_FEATURE_CLEAN_UP)
194 #if ENABLE_FEATURE_START_STOP_DAEMON_LONG_OPTIONS
195 static const char start_stop_daemon_longopts[] ALIGN1 =
196 "stop\0" No_argument "K"
197 "start\0" No_argument "S"
198 "background\0" No_argument "b"
199 "quiet\0" No_argument "q"
200 "make-pidfile\0" No_argument "m"
201 #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
202 "oknodo\0" No_argument "o"
203 "verbose\0" No_argument "v"
204 "nicelevel\0" Required_argument "N"
206 "startas\0" Required_argument "a"
207 "name\0" Required_argument "n"
208 "signal\0" Required_argument "s"
209 "user\0" Required_argument "u"
210 "chuid\0" Required_argument "c"
211 "exec\0" Required_argument "x"
212 "pidfile\0" Required_argument "p"
213 #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
214 "retry\0" Required_argument "R"
222 OPT_BACKGROUND = 0x4, // -b
223 OPT_QUIET = 0x8, // -q
224 OPT_MAKEPID = 0x10, // -m
232 OPT_OKNODO = 0x1000 * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -o
233 OPT_VERBOSE = 0x2000 * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -v
234 OPT_NICELEVEL = 0x4000 * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -N
237 int start_stop_daemon_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
238 int start_stop_daemon_main(int argc, char **argv)
244 #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
245 // char *retry_arg = NULL;
249 #if ENABLE_FEATURE_START_STOP_DAEMON_LONG_OPTIONS
250 applet_long_options = start_stop_daemon_longopts;
253 /* Check required one context option was given */
254 opt_complementary = "K:S:K--S:S--K:m?p:K?xpun:S?xa";
255 opt = getopt32(argv, "KSbqma:n:s:u:c:x:p:"
256 USE_FEATURE_START_STOP_DAEMON_FANCY("ovN:"),
257 // USE_FEATURE_START_STOP_DAEMON_FANCY("ovN:R:"),
258 &startas, &cmdname, &signame, &userspec, &chuid, &execname, &pidfile
259 USE_FEATURE_START_STOP_DAEMON_FANCY(,&opt_N)
260 // USE_FEATURE_START_STOP_DAEMON_FANCY(,&retry_arg)
263 quiet = (opt & OPT_QUIET) && !(opt & OPT_VERBOSE);
266 signal_nr = get_signum(signame);
267 if (signal_nr < 0) bb_show_usage();
273 // USE_FEATURE_START_STOP_DAEMON_FANCY(
275 // retries = xatoi_u(retry_arg);
281 user_id = bb_strtou(userspec, NULL, 10);
283 user_id = xuname2uid(userspec);
286 if (opt & CTX_STOP) {
288 return (opt & OPT_OKNODO) ? 0 : (i <= 0);
295 printf("%s already running\n%d\n", execname, found->pid);
296 return !(opt & OPT_OKNODO);
299 if (opt & OPT_BACKGROUND) {
304 if (pid < 0) /* error */
305 bb_perror_msg_and_die("vfork");
308 /* why _exit? the child may have changed the stack,
309 * so "return 0" may do bad things */
313 setsid(); /* detach from controlling tty */
314 /* Redirect stdio to /dev/null, close extra FDs.
315 * We do not actually daemonize because of DAEMON_ONLY_SANITIZE */
316 bb_daemonize_or_rexec(
318 + DAEMON_CLOSE_EXTRA_FDS
319 + DAEMON_ONLY_SANITIZE,
320 NULL /* argv, unused */ );
323 if (opt & OPT_MAKEPID) {
324 /* user wants _us_ to make the pidfile */
325 write_pidfile(pidfile);
328 struct bb_uidgid_t ugid;
329 parse_chown_usergroup_or_die(&ugid, chuid);
330 if (ugid.gid != (gid_t) -1) xsetgid(ugid.gid);
331 if (ugid.uid != (uid_t) -1) xsetuid(ugid.uid);
333 #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
334 if (opt & OPT_NICELEVEL) {
335 /* Set process priority */
336 int prio = getpriority(PRIO_PROCESS, 0) + xatoi_range(opt_N, INT_MIN/2, INT_MAX/2);
337 if (setpriority(PRIO_PROCESS, 0, prio) < 0) {
338 bb_perror_msg_and_die("setpriority(%d)", prio);
342 execv(startas, argv);
343 bb_perror_msg_and_die("cannot start %s", startas);