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
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21 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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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"
161 static const char *acts;
162 static char **service;
164 /* "Bernstein" time format: unix + 0x400000000000000aULL */
165 static uint64_t tstart, tnow;
166 static svstatus_t svstatus;
169 static void fatal_cannot(const char *m1) ATTRIBUTE_NORETURN;
170 static void fatal_cannot(const char *m1)
172 bb_perror_msg("fatal: cannot %s", m1);
176 static void out(const char *p, const char *m1)
178 printf("%s%s: %s", p, *service, m1);
180 printf(": %s", strerror(errno));
182 puts(""); /* will also flush the output */
185 #define WARN "warning: "
188 static void fail(const char *m1)
193 static void failx(const char *m1)
198 static void warn(const char *m1)
201 /* "warning: <service>: <m1>\n" */
202 out("warning: ", m1);
204 static void ok(const char *m1)
210 static int svstatus_get(void)
214 fd = open_write("supervise/ok");
216 if (errno == ENODEV) {
217 *acts == 'x' ? ok("runsv not running")
218 : failx("runsv not running");
221 warn("cannot open supervise/ok");
225 fd = open_read("supervise/status");
227 warn("cannot open supervise/status");
230 r = read(fd, &svstatus, 20);
236 warn("cannot read supervise/status");
240 warn("cannot read supervise/status: bad format");
246 static unsigned svstatus_print(const char *m)
254 if (stat("down", &s) == -1) {
255 if (errno != ENOENT) {
256 bb_perror_msg(WARN"cannot stat %s/down", *service);
261 pid = SWAP_LE32(svstatus.pid_le32);
262 timestamp = SWAP_BE64(svstatus.time_be64);
264 switch (svstatus.run_or_finish) {
265 case 1: printf("run: "); break;
266 case 2: printf("finish: "); break;
268 printf("%s: (pid %d) ", m, pid);
270 printf("down: %s: ", m);
272 diff = tnow - timestamp;
273 printf("%us", (diff < 0 ? 0 : diff));
275 if (!normallyup) printf(", normally down");
276 if (svstatus.paused) printf(", paused");
277 if (svstatus.want == 'd') printf(", want down");
278 if (svstatus.got_term) printf(", got TERM");
280 if (normallyup) printf(", normally up");
281 if (svstatus.want == 'u') printf(", want up");
286 static int status(const char *unused)
291 switch (r) { case -1: case 0: return 0; }
293 r = svstatus_print(*service);
294 if (chdir("log") == -1) {
295 if (errno != ENOENT) {
296 printf("; log: "WARN"cannot change to log service directory: %s",
299 } else if (svstatus_get()) {
301 svstatus_print("log");
303 puts(""); /* will also flush the output */
307 static int checkscript(void)
313 if (stat("check", &s) == -1) {
314 if (errno == ENOENT) return 1;
315 bb_perror_msg(WARN"cannot stat %s/check", *service);
318 /* if (!(s.st_mode & S_IXUSR)) return 1; */
319 prog[0] = (char*)"./check";
323 bb_perror_msg(WARN"cannot %s child %s/check", "run", *service);
326 while (wait_pid(&w, pid) == -1) {
327 if (errno == EINTR) continue;
328 bb_perror_msg(WARN"cannot %s child %s/check", "wait for", *service);
331 return !wait_exitcode(w);
334 static int check(const char *a)
348 pid = SWAP_LE32(svstatus.pid_le32);
353 if (!pid || svstatus.run_or_finish != 1) return 0;
354 if (!checkscript()) return 0;
360 if (pid && !checkscript()) return 0;
363 if (!pid && svstatus.want == 'd') break;
364 timestamp = SWAP_BE64(svstatus.time_be64);
365 if ((tstart > timestamp) || !pid || svstatus.got_term || !checkscript())
369 timestamp = SWAP_BE64(svstatus.time_be64);
370 if ((!pid && tstart > timestamp) || (pid && svstatus.want != 'd'))
374 svstatus_print(*service);
375 puts(""); /* will also flush the output */
379 static int control(const char *a)
383 if (svstatus_get() <= 0)
385 if (svstatus.want == *a)
387 fd = open_write("supervise/control");
390 warn("cannot open supervise/control");
392 *a == 'x' ? ok("runsv not running") : failx("runsv not running");
395 r = write(fd, a, strlen(a));
397 if (r != strlen(a)) {
398 warn("cannot write to supervise/control");
404 int sv_main(int argc, char **argv);
405 int sv_main(int argc, char **argv)
408 unsigned i, want_exit;
411 const char *varservice = "/var/service/";
414 unsigned waitsec = 7;
416 smallint verbose = 0;
417 int (*act)(const char*);
418 int (*cbk)(const char*);
421 xfunc_error_retval = 100;
424 if (x) varservice = x;
425 x = getenv("SVWAIT");
426 if (x) waitsec = xatou(x);
428 opt = getopt32(argv, "w:v", &x);
429 if (opt & 1) waitsec = xatou(x); // -w
430 if (opt & 2) verbose = 1; // -v
434 if (!action || !*argv) bb_show_usage();
438 tnow = time(0) + 0x400000000000000aULL;
440 curdir = open_read(".");
442 fatal_cannot("open current directory");
452 if (!verbose) cbk = NULL;
468 if (str_equal(action, "check")) {
473 case 'u': case 'd': case 'o': case 't': case 'p': case 'h':
474 case 'a': case 'i': case 'k': case 'q': case '1': case '2':
477 if (!verbose) cbk = NULL;
480 if (str_equal(action, "shutdown")) {
484 if (str_equal(action, "start")) {
488 if (str_equal(action, "stop")) {
497 if (str_equal(action, "restart")) {
503 if (str_equal(action, "force-reload")) {
508 if (str_equal(action, "force-restart")) {
513 if (str_equal(action, "force-shutdown")) {
518 if (str_equal(action, "force-stop")) {
528 for (i = 0; i < services; ++i) {
529 if ((**service != '/') && (**service != '.')) {
530 if (chdir(varservice) == -1)
533 if (chdir(*service) == -1) {
535 fail("cannot change to service directory");
536 goto nullify_service_0;
538 if (act && (act(acts) == -1)) {
542 if (fchdir(curdir) == -1)
543 fatal_cannot("change to original directory");
550 diff = tnow - tstart;
553 for (i = 0; i < services; ++i, ++service) {
556 if ((**service != '/') && (**service != '.')) {
557 if (chdir(varservice) == -1)
560 if (chdir(*service) == -1) {
562 fail("cannot change to service directory");
563 goto nullify_service;
566 goto nullify_service;
568 if (diff >= waitsec) {
569 printf(kll ? "kill: " : "timeout: ");
570 if (svstatus_get() > 0) {
571 svstatus_print(*service);
574 puts(""); /* will also flush the output */
580 if (fchdir(curdir) == -1)
581 fatal_cannot("change to original directory");
583 if (want_exit) break;
585 tnow = time(0) + 0x400000000000000aULL;
587 return rc > 99 ? 99 : rc;