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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16 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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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 $SVWAIT overrides the default 7 seconds to wait
141 for a command to take effect. It is overridden by the -w option.
144 sv exits 0, if the command was successfully sent to all services, and,
145 if it was told to wait, the command has taken effect to all services.
147 For each service that caused an error (e.g. the directory is not
148 controlled by a runsv(8) process, or sv timed out while waiting),
149 sv increases the exit code by one and exits non zero. The maximum
150 is 99. sv exits 100 on error.
153 /* Busyboxed by Denys Vlasenko <vda.linux@googlemail.com> */
159 //config: sv reports the current status and controls the state of services
160 //config: monitored by the runsv supervisor.
162 //config:config SV_DEFAULT_SERVICE_DIR
163 //config: string "Default directory for services"
164 //config: default "/var/service"
165 //config: depends on SV
167 //config: Default directory for services.
168 //config: Defaults to "/var/service"
170 //applet:IF_SV(APPLET(sv, BB_DIR_USR_BIN, BB_SUID_DROP))
172 //kbuild:lib-$(CONFIG_SV) += sv.o
174 //usage:#define sv_trivial_usage
175 //usage: "[-v] [-w SEC] CMD SERVICE_DIR..."
176 //usage:#define sv_full_usage "\n\n"
177 //usage: "Control services monitored by runsv supervisor.\n"
178 //usage: "Commands (only first character is enough):\n"
180 //usage: "status: query service status\n"
181 //usage: "up: if service isn't running, start it. If service stops, restart it\n"
182 //usage: "once: like 'up', but if service stops, don't restart it\n"
183 //usage: "down: send TERM and CONT signals. If ./run exits, start ./finish\n"
184 //usage: " if it exists. After it stops, don't restart service\n"
185 //usage: "exit: send TERM and CONT signals to service and log service. If they exit,\n"
186 //usage: " runsv exits too\n"
187 //usage: "pause, cont, hup, alarm, interrupt, quit, 1, 2, term, kill: send\n"
188 //usage: "STOP, CONT, HUP, ALRM, INT, QUIT, USR1, USR2, TERM, KILL signal to service"
190 #include <sys/file.h>
192 #include "runit_lib.h"
198 /* "Bernstein" time format: unix + 0x400000000000000aULL */
199 uint64_t tstart, tnow;
202 #define G (*(struct globals*)&bb_common_bufsiz1)
203 #define acts (G.acts )
204 #define service (G.service )
206 #define tstart (G.tstart )
207 #define tnow (G.tnow )
208 #define svstatus (G.svstatus )
209 #define INIT_G() do { } while (0)
212 #define str_equal(s,t) (!strcmp((s), (t)))
215 static void fatal_cannot(const char *m1) NORETURN;
216 static void fatal_cannot(const char *m1)
218 bb_perror_msg("fatal: can't %s", m1);
222 static void out(const char *p, const char *m1)
224 printf("%s%s: %s", p, *service, m1);
226 printf(": %s", strerror(errno));
228 bb_putchar('\n'); /* will also flush the output */
231 #define WARN "warning: "
234 static void fail(const char *m1)
239 static void failx(const char *m1)
244 static void warn(const char *m1)
247 /* "warning: <service>: <m1>\n" */
248 out("warning: ", m1);
250 static void ok(const char *m1)
256 static int svstatus_get(void)
260 fd = open("supervise/ok", O_WRONLY|O_NDELAY);
262 if (errno == ENODEV) {
263 *acts == 'x' ? ok("runsv not running")
264 : failx("runsv not running");
267 warn("can't open supervise/ok");
271 fd = open("supervise/status", O_RDONLY|O_NDELAY);
273 warn("can't open supervise/status");
276 r = read(fd, &svstatus, 20);
282 warn("can't read supervise/status");
286 warn("can't read supervise/status: bad format");
292 static unsigned svstatus_print(const char *m)
300 if (stat("down", &s) == -1) {
301 if (errno != ENOENT) {
302 bb_perror_msg(WARN"can't stat %s/down", *service);
307 pid = SWAP_LE32(svstatus.pid_le32);
308 timestamp = SWAP_BE64(svstatus.time_be64);
310 switch (svstatus.run_or_finish) {
311 case 1: printf("run: "); break;
312 case 2: printf("finish: "); break;
314 printf("%s: (pid %d) ", m, pid);
316 printf("down: %s: ", m);
318 diff = tnow - timestamp;
319 printf("%us", (diff < 0 ? 0 : diff));
321 if (!normallyup) printf(", normally down");
322 if (svstatus.paused) printf(", paused");
323 if (svstatus.want == 'd') printf(", want down");
324 if (svstatus.got_term) printf(", got TERM");
326 if (normallyup) printf(", normally up");
327 if (svstatus.want == 'u') printf(", want up");
332 static int status(const char *unused UNUSED_PARAM)
336 if (svstatus_get() <= 0)
339 r = svstatus_print(*service);
340 if (chdir("log") == -1) {
341 if (errno != ENOENT) {
342 printf("; log: "WARN"can't change to log service directory: %s",
345 } else if (svstatus_get()) {
347 svstatus_print("log");
349 bb_putchar('\n'); /* will also flush the output */
353 static int checkscript(void)
359 if (stat("check", &s) == -1) {
360 if (errno == ENOENT) return 1;
361 bb_perror_msg(WARN"can't stat %s/check", *service);
364 /* if (!(s.st_mode & S_IXUSR)) return 1; */
365 prog[0] = (char*)"./check";
369 bb_perror_msg(WARN"can't %s child %s/check", "run", *service);
372 while (safe_waitpid(pid, &w, 0) == -1) {
373 bb_perror_msg(WARN"can't %s child %s/check", "wait for", *service);
376 return WEXITSTATUS(w) == 0;
379 static int check(const char *a)
393 pid_le32 = svstatus.pid_le32;
398 if (!pid_le32 || svstatus.run_or_finish != 1) return 0;
399 if (!checkscript()) return 0;
402 if (pid_le32) return 0;
405 if (pid_le32 && !checkscript()) return 0;
408 if (!pid_le32 && svstatus.want == 'd') break;
409 timestamp = SWAP_BE64(svstatus.time_be64);
410 if ((tstart > timestamp) || !pid_le32 || svstatus.got_term || !checkscript())
414 timestamp = SWAP_BE64(svstatus.time_be64);
415 if ((!pid_le32 && tstart > timestamp) || (pid_le32 && svstatus.want != 'd'))
419 svstatus_print(*service);
420 bb_putchar('\n'); /* will also flush the output */
424 static int control(const char *a)
428 /* Is it an optimization?
429 It causes problems with "sv o SRV; ...; sv d SRV"
430 ('d' is not passed to SRV because its .want == 'd'):
431 if (svstatus_get() <= 0)
433 if (svstatus.want == *a)
436 fd = open("supervise/control", O_WRONLY|O_NDELAY);
439 warn("can't open supervise/control");
441 *a == 'x' ? ok("runsv not running") : failx("runsv not running");
448 warn("can't write to supervise/control");
454 int sv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
455 int sv_main(int argc UNUSED_PARAM, char **argv)
459 const char *varservice = CONFIG_SV_DEFAULT_SERVICE_DIR;
460 unsigned waitsec = 7;
463 int (*act)(const char*);
464 int (*cbk)(const char*);
469 xfunc_error_retval = 100;
472 if (x) varservice = x;
473 x = getenv("SVWAIT");
474 if (x) waitsec = xatou(x);
476 opt_complementary = "w+:vv"; /* -w N, -v is a counter */
477 getopt32(argv, "w:v", &waitsec, &verbose);
480 if (!action || !*argv) bb_show_usage();
482 tnow = time(NULL) + 0x400000000000000aULL;
484 curdir = open(".", O_RDONLY|O_NDELAY);
486 fatal_cannot("open current directory");
496 if (!verbose) cbk = NULL;
512 if (str_equal(action, "check")) {
517 case 'u': case 'd': case 'o': case 't': case 'p': case 'h':
518 case 'a': case 'i': case 'k': case 'q': case '1': case '2':
521 if (!verbose) cbk = NULL;
524 if (str_equal(action, "shutdown")) {
528 if (str_equal(action, "start")) {
532 if (str_equal(action, "stop")) {
541 if (str_equal(action, "restart")) {
547 if (str_equal(action, "force-reload")) {
552 if (str_equal(action, "force-restart")) {
557 if (str_equal(action, "force-shutdown")) {
562 if (str_equal(action, "force-stop")) {
572 while ((x = *service) != NULL) {
573 if (x[0] != '/' && x[0] != '.') {
574 if (chdir(varservice) == -1)
577 if (chdir(x) == -1) {
579 fail("can't change to service directory");
580 goto nullify_service_0;
582 if (act && (act(acts) == -1)) {
584 *service = (char*) -1L; /* "dead" */
586 if (fchdir(curdir) == -1)
587 fatal_cannot("change to original directory");
595 diff = tnow - tstart;
598 while ((x = *service) != NULL) {
599 if (x == (char*) -1L) /* "dead" */
601 if (x[0] != '/' && x[0] != '.') {
602 if (chdir(varservice) == -1)
605 if (chdir(x) == -1) {
607 fail("can't change to service directory");
608 goto nullify_service;
611 goto nullify_service;
613 if (diff >= waitsec) {
614 printf(kll ? "kill: " : "timeout: ");
615 if (svstatus_get() > 0) {
619 bb_putchar('\n'); /* will also flush the output */
623 *service = (char*) -1L; /* "dead" */
625 if (fchdir(curdir) == -1)
626 fatal_cannot("change to original directory");
630 if (want_exit) break;
632 tnow = time(NULL) + 0x400000000000000aULL;
634 return rc > 99 ? 99 : rc;