2 Copyright (c) 2001-2006, Gerrit Pape
5 Redistribution and use in source and binary forms, with or without
6 modification, are permitted provided that the following conditions are met:
8 1. Redistributions of source code must retain the above copyright notice,
9 this list of conditions and the following disclaimer.
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11 notice, this list of conditions and the following disclaimer in the
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28 /* Taken from http://smarden.sunsite.dk/runit/sv.8.html:
30 sv - control and manage services monitored by runsv
32 sv [-v] [-w sec] command services
33 /etc/init.d/service [-w sec] command
35 The sv program reports the current status and controls the state of services
36 monitored by the runsv(8) supervisor.
38 services consists of one or more arguments, each argument naming a directory
39 service used by runsv(8). If service doesn't start with a dot or slash,
40 it is searched in the default services directory /var/service/, otherwise
41 relative to the current directory.
43 command is one of up, down, status, once, pause, cont, hup, alarm, interrupt,
44 1, 2, term, kill, or exit, or start, stop, restart, shutdown, force-stop,
45 force-reload, force-restart, force-shutdown.
47 The sv program can be sym-linked to /etc/init.d/ to provide an LSB init
48 script interface. The service to be controlled then is specified by the
49 base name of the "init script".
52 Report the current status of the service, and the appendant log service
53 if available, to standard output.
55 If the service is not running, start it. If the service stops, restart it.
57 If the service is running, send it the TERM signal, and the CONT signal.
58 If ./run exits, start ./finish if it exists. After it stops, do not
61 If the service is not running, start it. Do not restart it if it stops.
62 pause cont hup alarm interrupt quit 1 2 term kill
63 If the service is running, send it the STOP, CONT, HUP, ALRM, INT, QUIT,
64 USR1, USR2, TERM, or KILL signal respectively.
66 If the service is running, send it the TERM signal, and the CONT signal.
67 Do not restart the service. If the service is down, and no log service
68 exists, runsv(8) exits. If the service is down and a log service exists,
69 send the TERM signal to the log service. If the log service is down,
70 runsv(8) exits. This command is ignored if it is given to an appendant
73 sv actually looks only at the first character of above commands.
75 Commands compatible to LSB init script actions:
80 Same as up, but wait up to 7 seconds for the command to take effect.
81 Then report the status or timeout. If the script ./check exists in
82 the service directory, sv runs this script to check whether the service
83 is up and available; it's considered to be available if ./check exits
86 Same as down, but wait up to 7 seconds for the service to become down.
87 Then report the status or timeout.
89 Send the commands term, cont, and up to the service, and wait up to
90 7 seconds for the service to restart. Then report the status or timeout.
91 If the script ./check exists in the service directory, sv runs this script
92 to check whether the service is up and available again; it's considered
93 to be available if ./check exits with 0.
95 Same as exit, but wait up to 7 seconds for the runsv(8) process
96 to terminate. Then report the status or timeout.
98 Same as down, but wait up to 7 seconds for the service to become down.
99 Then report the status, and on timeout send the service the kill command.
101 Send the service the term and cont commands, and wait up to
102 7 seconds for the service to restart. Then report the status,
103 and on timeout send the service the kill command.
105 Send the service the term, cont and up commands, and wait up to
106 7 seconds for the service to restart. Then report the status, and
107 on timeout send the service the kill command. If the script ./check
108 exists in the service directory, sv runs this script to check whether
109 the service is up and available again; it's considered to be available
110 if ./check exits with 0.
112 Same as exit, but wait up to 7 seconds for the runsv(8) process to
113 terminate. Then report the status, and on timeout send the service
119 Check for the service to be in the state that's been requested. Wait up to
120 7 seconds for the service to reach the requested state, then report
121 the status or timeout. If the requested state of the service is up,
122 and the script ./check exists in the service directory, sv runs
123 this script to check whether the service is up and running;
124 it's considered to be up if ./check exits with 0.
129 wait up to 7 seconds for the command to take effect.
130 Then report the status or timeout.
132 Override the default timeout of 7 seconds with sec seconds. Implies -v.
137 The environment variable $SVDIR overrides the default services directory
140 The environment variable $SVWAIT overrides the default 7 seconds to wait
141 for a command to take effect. It is overridden by the -w option.
144 sv exits 0, if the command was successfully sent to all services, and,
145 if it was told to wait, the command has taken effect to all services.
147 For each service that caused an error (e.g. the directory is not
148 controlled by a runsv(8) process, or sv timed out while waiting),
149 sv increases the exit code by one and exits non zero. The maximum
150 is 99. sv exits 100 on error.
153 /* Busyboxed by Denys Vlasenko <vda.linux@googlemail.com> */
154 /* TODO: depends on runit_lib.c - review and reduce/eliminate */
156 //usage:#define sv_trivial_usage
157 //usage: "[-v] [-w SEC] CMD SERVICE_DIR..."
158 //usage:#define sv_full_usage "\n\n"
159 //usage: "Control services monitored by runsv supervisor.\n"
160 //usage: "Commands (only first character is enough):\n"
162 //usage: "status: query service status\n"
163 //usage: "up: if service isn't running, start it. If service stops, restart it\n"
164 //usage: "once: like 'up', but if service stops, don't restart it\n"
165 //usage: "down: send TERM and CONT signals. If ./run exits, start ./finish\n"
166 //usage: " if it exists. After it stops, don't restart service\n"
167 //usage: "exit: send TERM and CONT signals to service and log service. If they exit,\n"
168 //usage: " runsv exits too\n"
169 //usage: "pause, cont, hup, alarm, interrupt, quit, 1, 2, term, kill: send\n"
170 //usage: "STOP, CONT, HUP, ALRM, INT, QUIT, USR1, USR2, TERM, KILL signal to service"
172 #include <sys/file.h>
174 #include "runit_lib.h"
180 /* "Bernstein" time format: unix + 0x400000000000000aULL */
181 uint64_t tstart, tnow;
184 #define G (*(struct globals*)&bb_common_bufsiz1)
185 #define acts (G.acts )
186 #define service (G.service )
188 #define tstart (G.tstart )
189 #define tnow (G.tnow )
190 #define svstatus (G.svstatus )
191 #define INIT_G() do { } while (0)
194 #define str_equal(s,t) (!strcmp((s), (t)))
197 static void fatal_cannot(const char *m1) NORETURN;
198 static void fatal_cannot(const char *m1)
200 bb_perror_msg("fatal: can't %s", m1);
204 static void out(const char *p, const char *m1)
206 printf("%s%s: %s", p, *service, m1);
208 printf(": %s", strerror(errno));
210 bb_putchar('\n'); /* will also flush the output */
213 #define WARN "warning: "
216 static void fail(const char *m1)
221 static void failx(const char *m1)
226 static void warn(const char *m1)
229 /* "warning: <service>: <m1>\n" */
230 out("warning: ", m1);
232 static void ok(const char *m1)
238 static int svstatus_get(void)
242 fd = open("supervise/ok", O_WRONLY|O_NDELAY);
244 if (errno == ENODEV) {
245 *acts == 'x' ? ok("runsv not running")
246 : failx("runsv not running");
249 warn("can't open supervise/ok");
253 fd = open("supervise/status", O_RDONLY|O_NDELAY);
255 warn("can't open supervise/status");
258 r = read(fd, &svstatus, 20);
264 warn("can't read supervise/status");
268 warn("can't read supervise/status: bad format");
274 static unsigned svstatus_print(const char *m)
282 if (stat("down", &s) == -1) {
283 if (errno != ENOENT) {
284 bb_perror_msg(WARN"can't stat %s/down", *service);
289 pid = SWAP_LE32(svstatus.pid_le32);
290 timestamp = SWAP_BE64(svstatus.time_be64);
292 switch (svstatus.run_or_finish) {
293 case 1: printf("run: "); break;
294 case 2: printf("finish: "); break;
296 printf("%s: (pid %d) ", m, pid);
298 printf("down: %s: ", m);
300 diff = tnow - timestamp;
301 printf("%us", (diff < 0 ? 0 : diff));
303 if (!normallyup) printf(", normally down");
304 if (svstatus.paused) printf(", paused");
305 if (svstatus.want == 'd') printf(", want down");
306 if (svstatus.got_term) printf(", got TERM");
308 if (normallyup) printf(", normally up");
309 if (svstatus.want == 'u') printf(", want up");
314 static int status(const char *unused UNUSED_PARAM)
318 if (svstatus_get() <= 0)
321 r = svstatus_print(*service);
322 if (chdir("log") == -1) {
323 if (errno != ENOENT) {
324 printf("; log: "WARN"can't change to log service directory: %s",
327 } else if (svstatus_get()) {
329 svstatus_print("log");
331 bb_putchar('\n'); /* will also flush the output */
335 static int checkscript(void)
341 if (stat("check", &s) == -1) {
342 if (errno == ENOENT) return 1;
343 bb_perror_msg(WARN"can't stat %s/check", *service);
346 /* if (!(s.st_mode & S_IXUSR)) return 1; */
347 prog[0] = (char*)"./check";
351 bb_perror_msg(WARN"can't %s child %s/check", "run", *service);
354 while (safe_waitpid(pid, &w, 0) == -1) {
355 bb_perror_msg(WARN"can't %s child %s/check", "wait for", *service);
358 return WEXITSTATUS(w) == 0;
361 static int check(const char *a)
375 pid_le32 = svstatus.pid_le32;
380 if (!pid_le32 || svstatus.run_or_finish != 1) return 0;
381 if (!checkscript()) return 0;
384 if (pid_le32) return 0;
387 if (pid_le32 && !checkscript()) return 0;
390 if (!pid_le32 && svstatus.want == 'd') break;
391 timestamp = SWAP_BE64(svstatus.time_be64);
392 if ((tstart > timestamp) || !pid_le32 || svstatus.got_term || !checkscript())
396 timestamp = SWAP_BE64(svstatus.time_be64);
397 if ((!pid_le32 && tstart > timestamp) || (pid_le32 && svstatus.want != 'd'))
401 svstatus_print(*service);
402 bb_putchar('\n'); /* will also flush the output */
406 static int control(const char *a)
410 /* Is it an optimization?
411 It causes problems with "sv o SRV; ...; sv d SRV"
412 ('d' is not passed to SRV because its .want == 'd'):
413 if (svstatus_get() <= 0)
415 if (svstatus.want == *a)
418 fd = open("supervise/control", O_WRONLY|O_NDELAY);
421 warn("can't open supervise/control");
423 *a == 'x' ? ok("runsv not running") : failx("runsv not running");
430 warn("can't write to supervise/control");
436 int sv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
437 int sv_main(int argc UNUSED_PARAM, char **argv)
441 const char *varservice = CONFIG_SV_DEFAULT_SERVICE_DIR;
442 unsigned waitsec = 7;
445 int (*act)(const char*);
446 int (*cbk)(const char*);
451 xfunc_error_retval = 100;
454 if (x) varservice = x;
455 x = getenv("SVWAIT");
456 if (x) waitsec = xatou(x);
458 opt_complementary = "w+:vv"; /* -w N, -v is a counter */
459 getopt32(argv, "w:v", &waitsec, &verbose);
462 if (!action || !*argv) bb_show_usage();
464 tnow = time(NULL) + 0x400000000000000aULL;
466 curdir = open(".", O_RDONLY|O_NDELAY);
468 fatal_cannot("open current directory");
478 if (!verbose) cbk = NULL;
494 if (str_equal(action, "check")) {
499 case 'u': case 'd': case 'o': case 't': case 'p': case 'h':
500 case 'a': case 'i': case 'k': case 'q': case '1': case '2':
503 if (!verbose) cbk = NULL;
506 if (str_equal(action, "shutdown")) {
510 if (str_equal(action, "start")) {
514 if (str_equal(action, "stop")) {
523 if (str_equal(action, "restart")) {
529 if (str_equal(action, "force-reload")) {
534 if (str_equal(action, "force-restart")) {
539 if (str_equal(action, "force-shutdown")) {
544 if (str_equal(action, "force-stop")) {
554 while ((x = *service) != NULL) {
555 if (x[0] != '/' && x[0] != '.') {
556 if (chdir(varservice) == -1)
559 if (chdir(x) == -1) {
561 fail("can't change to service directory");
562 goto nullify_service_0;
564 if (act && (act(acts) == -1)) {
566 *service = (char*) -1L; /* "dead" */
568 if (fchdir(curdir) == -1)
569 fatal_cannot("change to original directory");
577 diff = tnow - tstart;
580 while ((x = *service) != NULL) {
581 if (x == (char*) -1L) /* "dead" */
583 if (x[0] != '/' && x[0] != '.') {
584 if (chdir(varservice) == -1)
587 if (chdir(x) == -1) {
589 fail("can't change to service directory");
590 goto nullify_service;
593 goto nullify_service;
595 if (diff >= waitsec) {
596 printf(kll ? "kill: " : "timeout: ");
597 if (svstatus_get() > 0) {
601 bb_putchar('\n'); /* will also flush the output */
605 *service = (char*) -1L; /* "dead" */
607 if (fchdir(curdir) == -1)
608 fatal_cannot("change to original directory");
612 if (want_exit) break;
614 tnow = time(NULL) + 0x400000000000000aULL;
616 return rc > 99 ? 99 : rc;