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;
36 #define G (*(struct globals*)&bb_common_bufsiz1)
37 #define found (G.found )
38 #define userspec (G.userspec )
39 #define cmdname (G.cmdname )
40 #define execname (G.execname )
41 #define pidfile (G.pidfile )
42 #define user_id (G.user_id )
43 #define quiet (G.quiet )
44 #define signal_nr (G.signal_nr )
52 static int pid_is_exec(pid_t pid)
54 struct stat st, execstat;
55 char buf[sizeof("/proc//exe") + sizeof(int)*3];
57 sprintf(buf, "/proc/%u/exe", pid);
58 if (stat(buf, &st) < 0)
60 xstat(execname, &execstat);
61 if (st.st_dev == execstat.st_dev
62 && st.st_ino == execstat.st_ino)
67 static int pid_is_user(int pid)
70 char buf[sizeof("/proc/") + sizeof(int)*3];
72 sprintf(buf, "/proc/%u", pid);
73 if (stat(buf, &sb) != 0)
75 return (sb.st_uid == user_id);
78 static int pid_is_cmd(pid_t pid)
80 char buf[256]; /* is it big enough? */
83 sprintf(buf, "/proc/%u/stat", pid);
84 if (open_read_close(buf, buf, sizeof(buf) - 1) < 0)
86 buf[sizeof(buf) - 1] = '\0'; /* paranoia */
90 pe = strrchr(++p, ')');
94 return !strcmp(p, cmdname);
97 static void check(int pid)
101 if (execname && !pid_is_exec(pid)) {
104 if (userspec && !pid_is_user(pid)) {
107 if (cmdname && !pid_is_cmd(pid)) {
110 p = xmalloc(sizeof(*p));
116 static void do_pidfile(void)
121 f = fopen(pidfile, "r");
123 if (fscanf(f, "%u", &pid) == 1)
126 } else if (errno != ENOENT)
127 bb_perror_msg_and_die("open pidfile %s", pidfile);
130 static void do_procinit(void)
133 struct dirent *entry;
141 procdir = xopendir("/proc");
145 errno = 0; /* clear any previous error */
146 entry = readdir(procdir);
147 // TODO: check for exact errno(s) which mean that we got stale entry
148 if (errno) /* Stale entry, process has died after opendir */
150 if (!entry) /* EOF, no more entries */
152 pid = bb_strtou(entry->d_name, NULL, 10);
159 bb_error_msg_and_die("nothing in /proc - not mounted?");
162 static int do_stop(void)
169 if (ENABLE_FEATURE_CLEAN_UP) what = xstrdup(cmdname);
170 if (!ENABLE_FEATURE_CLEAN_UP) what = cmdname;
171 } else if (execname) {
172 if (ENABLE_FEATURE_CLEAN_UP) what = xstrdup(execname);
173 if (!ENABLE_FEATURE_CLEAN_UP) what = execname;
175 what = xasprintf("process in pidfile '%s'", pidfile);
177 what = xasprintf("process(es) owned by '%s'", userspec);
179 bb_error_msg_and_die("internal error, please report");
183 printf("no %s found; none killed\n", what);
187 for (p = found; p; p = p->next) {
188 if (kill(p->pid, signal_nr) == 0) {
192 bb_perror_msg("warning: killing process %u", p->pid);
195 if (!quiet && killed) {
196 printf("stopped %s (pid", what);
197 for (p = found; p; p = p->next)
199 printf(" %u", - p->pid);
203 if (ENABLE_FEATURE_CLEAN_UP)
208 #if ENABLE_FEATURE_START_STOP_DAEMON_LONG_OPTIONS
209 static const char start_stop_daemon_longopts[] ALIGN1 =
210 "stop\0" No_argument "K"
211 "start\0" No_argument "S"
212 "background\0" No_argument "b"
213 "quiet\0" No_argument "q"
214 "make-pidfile\0" No_argument "m"
215 #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
216 "oknodo\0" No_argument "o"
217 "verbose\0" No_argument "v"
218 "nicelevel\0" Required_argument "N"
220 "startas\0" Required_argument "a"
221 "name\0" Required_argument "n"
222 "signal\0" Required_argument "s"
223 "user\0" Required_argument "u"
224 "chuid\0" Required_argument "c"
225 "exec\0" Required_argument "x"
226 "pidfile\0" Required_argument "p"
227 #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
228 "retry\0" Required_argument "R"
236 OPT_BACKGROUND = 0x4, // -b
237 OPT_QUIET = 0x8, // -q
238 OPT_MAKEPID = 0x10, // -m
246 OPT_OKNODO = 0x1000 * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -o
247 OPT_VERBOSE = 0x2000 * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -v
248 OPT_NICELEVEL = 0x4000 * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -N
251 int start_stop_daemon_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
252 int start_stop_daemon_main(int argc ATTRIBUTE_UNUSED, char **argv)
258 #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
259 // char *retry_arg = NULL;
266 #if ENABLE_FEATURE_START_STOP_DAEMON_LONG_OPTIONS
267 applet_long_options = start_stop_daemon_longopts;
270 /* Check required one context option was given */
271 opt_complementary = "K:S:K--S:S--K:m?p:K?xpun:S?xa";
272 opt = getopt32(argv, "KSbqma:n:s:u:c:x:p:"
273 USE_FEATURE_START_STOP_DAEMON_FANCY("ovN:"),
274 // USE_FEATURE_START_STOP_DAEMON_FANCY("ovN:R:"),
275 &startas, &cmdname, &signame, &userspec, &chuid, &execname, &pidfile
276 USE_FEATURE_START_STOP_DAEMON_FANCY(,&opt_N)
277 // USE_FEATURE_START_STOP_DAEMON_FANCY(,&retry_arg)
280 quiet = (opt & OPT_QUIET) && !(opt & OPT_VERBOSE);
283 signal_nr = get_signum(signame);
284 if (signal_nr < 0) bb_show_usage();
290 // USE_FEATURE_START_STOP_DAEMON_FANCY(
292 // retries = xatoi_u(retry_arg);
298 user_id = bb_strtou(userspec, NULL, 10);
300 user_id = xuname2uid(userspec);
303 do_procinit(); /* Both start and stop needs to know current processes */
305 if (opt & CTX_STOP) {
307 return (opt & OPT_OKNODO) ? 0 : (i <= 0);
312 printf("%s already running\n%d\n", execname, found->pid);
313 return !(opt & OPT_OKNODO);
316 if (opt & OPT_BACKGROUND) {
321 if (pid < 0) /* error */
322 bb_perror_msg_and_die("vfork");
325 /* why _exit? the child may have changed the stack,
326 * so "return 0" may do bad things */
330 setsid(); /* detach from controlling tty */
331 /* Redirect stdio to /dev/null, close extra FDs.
332 * We do not actually daemonize because of DAEMON_ONLY_SANITIZE */
333 bb_daemonize_or_rexec(
335 + DAEMON_CLOSE_EXTRA_FDS
336 + DAEMON_ONLY_SANITIZE,
337 NULL /* argv, unused */ );
340 if (opt & OPT_MAKEPID) {
341 /* user wants _us_ to make the pidfile */
342 write_pidfile(pidfile);
345 struct bb_uidgid_t ugid;
346 parse_chown_usergroup_or_die(&ugid, chuid);
347 if (ugid.gid != (gid_t) -1) xsetgid(ugid.gid);
348 if (ugid.uid != (uid_t) -1) xsetuid(ugid.uid);
350 #if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
351 if (opt & OPT_NICELEVEL) {
352 /* Set process priority */
353 int prio = getpriority(PRIO_PROCESS, 0) + xatoi_range(opt_N, INT_MIN/2, INT_MAX/2);
354 if (setpriority(PRIO_PROCESS, 0, prio) < 0) {
355 bb_perror_msg_and_die("setpriority(%d)", prio);
359 execv(startas, argv);
360 bb_perror_msg_and_die("cannot start %s", startas);