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.
10 2. Redistributions in binary form must reproduce the above copyright
11 notice, this list of conditions and the following disclaimer in the
12 documentation and/or other materials provided with the distribution.
13 3. The name of the author may not be used to endorse or promote products
14 derived from this software without specific prior written permission.
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
19 EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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21 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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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 Denis Vlasenko <vda.linux@googlemail.com> */
154 /* TODO: depends on runit_lib.c - review and reduce/eliminate */
156 #include <sys/poll.h>
157 #include <sys/file.h>
159 #include "runit_lib.h"
165 /* "Bernstein" time format: unix + 0x400000000000000aULL */
166 uint64_t tstart, tnow;
169 #define G (*(struct globals*)&bb_common_bufsiz1)
170 #define acts (G.acts )
171 #define service (G.service )
173 #define tstart (G.tstart )
174 #define tnow (G.tnow )
175 #define svstatus (G.svstatus )
176 #define INIT_G() do { } while (0)
179 static void fatal_cannot(const char *m1) ATTRIBUTE_NORETURN;
180 static void fatal_cannot(const char *m1)
182 bb_perror_msg("fatal: cannot %s", m1);
186 static void out(const char *p, const char *m1)
188 printf("%s%s: %s", p, *service, m1);
190 printf(": %s", strerror(errno));
192 bb_putchar('\n'); /* will also flush the output */
195 #define WARN "warning: "
198 static void fail(const char *m1)
203 static void failx(const char *m1)
208 static void warn(const char *m1)
211 /* "warning: <service>: <m1>\n" */
212 out("warning: ", m1);
214 static void ok(const char *m1)
220 static int svstatus_get(void)
224 fd = open_write("supervise/ok");
226 if (errno == ENODEV) {
227 *acts == 'x' ? ok("runsv not running")
228 : failx("runsv not running");
231 warn("cannot open supervise/ok");
235 fd = open_read("supervise/status");
237 warn("cannot open supervise/status");
240 r = read(fd, &svstatus, 20);
246 warn("cannot read supervise/status");
250 warn("cannot read supervise/status: bad format");
256 static unsigned svstatus_print(const char *m)
264 if (stat("down", &s) == -1) {
265 if (errno != ENOENT) {
266 bb_perror_msg(WARN"cannot stat %s/down", *service);
271 pid = SWAP_LE32(svstatus.pid_le32);
272 timestamp = SWAP_BE64(svstatus.time_be64);
274 switch (svstatus.run_or_finish) {
275 case 1: printf("run: "); break;
276 case 2: printf("finish: "); break;
278 printf("%s: (pid %d) ", m, pid);
280 printf("down: %s: ", m);
282 diff = tnow - timestamp;
283 printf("%us", (diff < 0 ? 0 : diff));
285 if (!normallyup) printf(", normally down");
286 if (svstatus.paused) printf(", paused");
287 if (svstatus.want == 'd') printf(", want down");
288 if (svstatus.got_term) printf(", got TERM");
290 if (normallyup) printf(", normally up");
291 if (svstatus.want == 'u') printf(", want up");
296 static int status(const char *unused)
301 switch (r) { case -1: case 0: return 0; }
303 r = svstatus_print(*service);
304 if (chdir("log") == -1) {
305 if (errno != ENOENT) {
306 printf("; log: "WARN"cannot change to log service directory: %s",
309 } else if (svstatus_get()) {
311 svstatus_print("log");
313 bb_putchar('\n'); /* will also flush the output */
317 static int checkscript(void)
323 if (stat("check", &s) == -1) {
324 if (errno == ENOENT) return 1;
325 bb_perror_msg(WARN"cannot stat %s/check", *service);
328 /* if (!(s.st_mode & S_IXUSR)) return 1; */
329 prog[0] = (char*)"./check";
333 bb_perror_msg(WARN"cannot %s child %s/check", "run", *service);
336 while (wait_pid(&w, pid) == -1) {
337 if (errno == EINTR) continue;
338 bb_perror_msg(WARN"cannot %s child %s/check", "wait for", *service);
341 return !wait_exitcode(w);
344 static int check(const char *a)
358 pid = SWAP_LE32(svstatus.pid_le32);
363 if (!pid || svstatus.run_or_finish != 1) return 0;
364 if (!checkscript()) return 0;
370 if (pid && !checkscript()) return 0;
373 if (!pid && svstatus.want == 'd') break;
374 timestamp = SWAP_BE64(svstatus.time_be64);
375 if ((tstart > timestamp) || !pid || svstatus.got_term || !checkscript())
379 timestamp = SWAP_BE64(svstatus.time_be64);
380 if ((!pid && tstart > timestamp) || (pid && svstatus.want != 'd'))
384 svstatus_print(*service);
385 bb_putchar('\n'); /* will also flush the output */
389 static int control(const char *a)
393 if (svstatus_get() <= 0)
395 if (svstatus.want == *a)
397 fd = open_write("supervise/control");
400 warn("cannot open supervise/control");
402 *a == 'x' ? ok("runsv not running") : failx("runsv not running");
405 r = write(fd, a, strlen(a));
407 if (r != strlen(a)) {
408 warn("cannot write to supervise/control");
414 int sv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
415 int sv_main(int argc, char **argv)
418 unsigned i, want_exit;
421 const char *varservice = "/var/service/";
424 unsigned waitsec = 7;
426 smallint verbose = 0;
427 int (*act)(const char*);
428 int (*cbk)(const char*);
433 xfunc_error_retval = 100;
436 if (x) varservice = x;
437 x = getenv("SVWAIT");
438 if (x) waitsec = xatou(x);
440 opt = getopt32(argv, "w:v", &x);
441 if (opt & 1) waitsec = xatou(x); // -w
442 if (opt & 2) verbose = 1; // -v
446 if (!action || !*argv) bb_show_usage();
450 tnow = time(0) + 0x400000000000000aULL;
452 curdir = open_read(".");
454 fatal_cannot("open current directory");
464 if (!verbose) cbk = NULL;
480 if (str_equal(action, "check")) {
485 case 'u': case 'd': case 'o': case 't': case 'p': case 'h':
486 case 'a': case 'i': case 'k': case 'q': case '1': case '2':
489 if (!verbose) cbk = NULL;
492 if (str_equal(action, "shutdown")) {
496 if (str_equal(action, "start")) {
500 if (str_equal(action, "stop")) {
509 if (str_equal(action, "restart")) {
515 if (str_equal(action, "force-reload")) {
520 if (str_equal(action, "force-restart")) {
525 if (str_equal(action, "force-shutdown")) {
530 if (str_equal(action, "force-stop")) {
540 for (i = 0; i < services; ++i) {
541 if ((**service != '/') && (**service != '.')) {
542 if (chdir(varservice) == -1)
545 if (chdir(*service) == -1) {
547 fail("cannot change to service directory");
548 goto nullify_service_0;
550 if (act && (act(acts) == -1)) {
554 if (fchdir(curdir) == -1)
555 fatal_cannot("change to original directory");
562 diff = tnow - tstart;
565 for (i = 0; i < services; ++i, ++service) {
568 if ((**service != '/') && (**service != '.')) {
569 if (chdir(varservice) == -1)
572 if (chdir(*service) == -1) {
574 fail("cannot change to service directory");
575 goto nullify_service;
578 goto nullify_service;
580 if (diff >= waitsec) {
581 printf(kll ? "kill: " : "timeout: ");
582 if (svstatus_get() > 0) {
583 svstatus_print(*service);
586 bb_putchar('\n'); /* will also flush the output */
592 if (fchdir(curdir) == -1)
593 fatal_cannot("change to original directory");
595 if (want_exit) break;
597 tnow = time(0) + 0x400000000000000aULL;
599 return rc > 99 ? 99 : rc;