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 */
14 #include <sys/resource.h>
16 /* Override ENABLE_FEATURE_PIDFILE */
17 #define WANT_PIDFILE 1
21 struct pid_list *next;
27 struct pid_list *found;
37 #define G (*(struct globals*)&bb_common_bufsiz1)
38 #define found (G.found )
39 #define userspec (G.userspec )
40 #define cmdname (G.cmdname )
41 #define execname (G.execname )
42 #define pidfile (G.pidfile )
43 #define user_id (G.user_id )
44 #define quiet (G.quiet )
45 #define signal_nr (G.signal_nr )
46 #define execstat (G.execstat )
54 static int pid_is_exec(pid_t pid)
57 char buf[sizeof("/proc//exe") + sizeof(int)*3];
59 sprintf(buf, "/proc/%u/exe", pid);
60 if (stat(buf, &st) < 0)
62 if (st.st_dev == execstat.st_dev
63 && st.st_ino == execstat.st_ino)
68 static int pid_is_user(int pid)
71 char buf[sizeof("/proc/") + sizeof(int)*3];
73 sprintf(buf, "/proc/%u", pid);
74 if (stat(buf, &sb) != 0)
76 return (sb.st_uid == user_id);
79 static int pid_is_cmd(pid_t pid)
81 char buf[256]; /* is it big enough? */
84 sprintf(buf, "/proc/%u/stat", pid);
85 if (open_read_close(buf, buf, sizeof(buf) - 1) < 0)
87 buf[sizeof(buf) - 1] = '\0'; /* paranoia */
91 pe = strrchr(++p, ')');
95 return !strcmp(p, cmdname);
98 static void check(int pid)
102 if (execname && !pid_is_exec(pid)) {
105 if (userspec && !pid_is_user(pid)) {
108 if (cmdname && !pid_is_cmd(pid)) {
111 p = xmalloc(sizeof(*p));
117 static void do_pidfile(void)
122 f = fopen(pidfile, "r");
124 if (fscanf(f, "%u", &pid) == 1)
127 } else if (errno != ENOENT)
128 bb_perror_msg_and_die("open pidfile %s", pidfile);
131 static void do_procinit(void)
134 struct dirent *entry;
142 procdir = xopendir("/proc");
146 errno = 0; /* clear any previous error */
147 entry = readdir(procdir);
148 // TODO: check for exact errno(s) which mean that we got stale entry
149 if (errno) /* Stale entry, process has died after opendir */
151 if (!entry) /* EOF, no more entries */
153 pid = bb_strtou(entry->d_name, NULL, 10);
160 bb_error_msg_and_die("nothing in /proc - not mounted?");
163 static int do_stop(void)
170 if (ENABLE_FEATURE_CLEAN_UP) what = xstrdup(cmdname);
171 if (!ENABLE_FEATURE_CLEAN_UP) what = cmdname;
172 } else if (execname) {
173 if (ENABLE_FEATURE_CLEAN_UP) what = xstrdup(execname);
174 if (!ENABLE_FEATURE_CLEAN_UP) what = execname;
176 what = xasprintf("process in pidfile '%s'", pidfile);
178 what = xasprintf("process(es) owned by '%s'", userspec);
180 bb_error_msg_and_die("internal error, please report");
184 printf("no %s found; none killed\n", what);
188 for (p = found; p; p = p->next) {
189 if (kill(p->pid, signal_nr) == 0) {
193 bb_perror_msg("warning: killing process %u", p->pid);
196 if (!quiet && killed) {
197 printf("stopped %s (pid", what);
198 for (p = found; p; p = p->next)
200 printf(" %u", - p->pid);
204 if (ENABLE_FEATURE_CLEAN_UP)
209 #if ENABLE_FEATURE_START_STOP_DAEMON_LONG_OPTIONS
210 static const char start_stop_daemon_longopts[] ALIGN1 =
211 "stop\0" No_argument "K"
212 "start\0" No_argument "S"
213 "background\0" No_argument "b"
214 "quiet\0" No_argument "q"
215 "make-pidfile\0" No_argument "m"
216 #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
217 "oknodo\0" No_argument "o"
218 "verbose\0" No_argument "v"
219 "nicelevel\0" Required_argument "N"
221 "startas\0" Required_argument "a"
222 "name\0" Required_argument "n"
223 "signal\0" Required_argument "s"
224 "user\0" Required_argument "u"
225 "chuid\0" Required_argument "c"
226 "exec\0" Required_argument "x"
227 "pidfile\0" Required_argument "p"
228 #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
229 "retry\0" Required_argument "R"
237 OPT_BACKGROUND = 0x4, // -b
238 OPT_QUIET = 0x8, // -q
239 OPT_MAKEPID = 0x10, // -m
247 OPT_OKNODO = 0x1000 * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -o
248 OPT_VERBOSE = 0x2000 * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -v
249 OPT_NICELEVEL = 0x4000 * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -N
252 int start_stop_daemon_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
253 int start_stop_daemon_main(int argc ATTRIBUTE_UNUSED, char **argv)
259 #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
260 // char *retry_arg = NULL;
267 #if ENABLE_FEATURE_START_STOP_DAEMON_LONG_OPTIONS
268 applet_long_options = start_stop_daemon_longopts;
271 /* Check required one context option was given */
272 opt_complementary = "K:S:K--S:S--K:m?p:K?xpun:S?xa";
273 opt = getopt32(argv, "KSbqma:n:s:u:c:x:p:"
274 USE_FEATURE_START_STOP_DAEMON_FANCY("ovN:"),
275 // USE_FEATURE_START_STOP_DAEMON_FANCY("ovN:R:"),
276 &startas, &cmdname, &signame, &userspec, &chuid, &execname, &pidfile
277 USE_FEATURE_START_STOP_DAEMON_FANCY(,&opt_N)
278 // USE_FEATURE_START_STOP_DAEMON_FANCY(,&retry_arg)
281 quiet = (opt & OPT_QUIET) && !(opt & OPT_VERBOSE);
284 signal_nr = get_signum(signame);
285 if (signal_nr < 0) bb_show_usage();
291 // USE_FEATURE_START_STOP_DAEMON_FANCY(
293 // retries = xatoi_u(retry_arg);
299 user_id = bb_strtou(userspec, NULL, 10);
301 user_id = xuname2uid(userspec);
304 xstat(execname, &execstat);
306 do_procinit(); /* Both start and stop needs to know current processes */
308 if (opt & CTX_STOP) {
310 return (opt & OPT_OKNODO) ? 0 : (i <= 0);
315 printf("%s already running\n%d\n", execname, found->pid);
316 return !(opt & OPT_OKNODO);
319 if (opt & OPT_BACKGROUND) {
324 if (pid < 0) /* error */
325 bb_perror_msg_and_die("vfork");
328 /* why _exit? the child may have changed the stack,
329 * so "return 0" may do bad things */
333 setsid(); /* detach from controlling tty */
334 /* Redirect stdio to /dev/null, close extra FDs.
335 * We do not actually daemonize because of DAEMON_ONLY_SANITIZE */
336 bb_daemonize_or_rexec(
338 + DAEMON_CLOSE_EXTRA_FDS
339 + DAEMON_ONLY_SANITIZE,
340 NULL /* argv, unused */ );
343 if (opt & OPT_MAKEPID) {
344 /* user wants _us_ to make the pidfile */
345 write_pidfile(pidfile);
348 struct bb_uidgid_t ugid;
349 parse_chown_usergroup_or_die(&ugid, chuid);
350 if (ugid.gid != (gid_t) -1) xsetgid(ugid.gid);
351 if (ugid.uid != (uid_t) -1) xsetuid(ugid.uid);
353 #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
354 if (opt & OPT_NICELEVEL) {
355 /* Set process priority */
356 int prio = getpriority(PRIO_PROCESS, 0) + xatoi_range(opt_N, INT_MIN/2, INT_MAX/2);
357 if (setpriority(PRIO_PROCESS, 0, prio) < 0) {
358 bb_perror_msg_and_die("setpriority(%d)", prio);
362 execv(startas, argv);
363 bb_perror_msg_and_die("cannot start %s", startas);