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
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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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 static struct taia tstart, tnow;
165 static char svstatus[20];
167 #define usage() bb_show_usage()
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_cannot(const char *m1)
201 out("warning: cannot ", m1);
203 static void warnx_cannot(const char *m1)
208 static void ok(const char *m1)
214 static int svstatus_get(void)
218 fd = open_write("supervise/ok");
220 if (errno == ENODEV) {
221 *acts == 'x' ? ok("runsv not running")
222 : failx("runsv not running");
225 warn_cannot("open supervise/ok");
229 fd = open_read("supervise/status");
231 warn_cannot("open supervise/status");
234 r = read(fd, svstatus, 20);
238 case -1: warn_cannot("read supervise/status"); return -1;
239 default: warnx_cannot("read supervise/status: bad format"); return -1;
244 static unsigned svstatus_print(const char *m)
252 if (stat("down", &s) == -1) {
253 if (errno != ENOENT) {
254 bb_perror_msg(WARN"cannot stat %s/down", *service);
259 pid = (unsigned char) svstatus[15];
260 pid <<= 8; pid += (unsigned char)svstatus[14];
261 pid <<= 8; pid += (unsigned char)svstatus[13];
262 pid <<= 8; pid += (unsigned char)svstatus[12];
263 tai_unpack(svstatus, &tstatus);
265 switch (svstatus[19]) {
266 case 1: printf("run: "); break;
267 case 2: printf("finish: "); break;
269 printf("%s: (pid %d) ", m, pid);
271 printf("down: %s: ", m);
273 diff = tnow.sec.x - tstatus.x;
274 printf("%lds", (diff < 0 ? 0L : diff));
276 if (!normallyup) printf(", normally down");
277 if (svstatus[16]) printf(", paused");
278 if (svstatus[17] == 'd') printf(", want down");
279 if (svstatus[18]) printf(", got TERM");
281 if (normallyup) printf(", normally up");
282 if (svstatus[17] == 'u') printf(", want up");
287 static int status(const char *unused)
292 switch (r) { case -1: case 0: return 0; }
294 r = svstatus_print(*service);
295 if (chdir("log") == -1) {
296 if (errno != ENOENT) {
297 printf("; log: "WARN"cannot change to log service directory: %s",
300 } else if (svstatus_get()) {
302 svstatus_print("log");
304 puts(""); /* will also flush the output */
308 static int checkscript(void)
314 if (stat("check", &s) == -1) {
315 if (errno == ENOENT) return 1;
316 bb_perror_msg(WARN"cannot stat %s/check", *service);
319 /* if (!(s.st_mode & S_IXUSR)) return 1; */
320 prog[0] = (char*)"./check";
324 bb_perror_msg(WARN"cannot %s child %s/check", "run", *service);
327 while (wait_pid(&w, pid) == -1) {
328 if (errno == EINTR) continue;
329 bb_perror_msg(WARN"cannot %s child %s/check", "wait for", *service);
332 return !wait_exitcode(w);
335 static int check(const char *a)
349 pid = (unsigned char)svstatus[15];
350 pid <<= 8; pid += (unsigned char)svstatus[14];
351 pid <<= 8; pid += (unsigned char)svstatus[13];
352 pid <<= 8; pid += (unsigned char)svstatus[12];
357 if (!pid || svstatus[19] != 1) return 0;
358 if (!checkscript()) return 0;
364 if (pid && !checkscript()) return 0;
367 if (!pid && svstatus[17] == 'd') break;
368 tai_unpack(svstatus, &tstatus);
369 if ((tstart.sec.x > tstatus.x) || !pid || svstatus[18] || !checkscript())
373 tai_unpack(svstatus, &tstatus);
374 if ((!pid && tstart.sec.x > tstatus.x) || (pid && svstatus[17] != 'd'))
378 svstatus_print(*service);
379 puts(""); /* will also flush the output */
383 static int control(const char *a)
387 if (svstatus_get() <= 0) return -1;
388 if (svstatus[17] == *a) return 0;
389 fd = open_write("supervise/control");
392 warn_cannot("open supervise/control");
394 *a == 'x' ? ok("runsv not running") : failx("runsv not running");
397 r = write(fd, a, strlen(a));
399 if (r != strlen(a)) {
400 warn_cannot("write to supervise/control");
406 int sv_main(int argc, char **argv);
407 int sv_main(int argc, char **argv)
410 unsigned i, want_exit;
413 const char *varservice = "/var/service/";
416 unsigned long waitsec = 7;
418 smallint verbose = 0;
419 int (*act)(const char*);
420 int (*cbk)(const char*);
423 xfunc_error_retval = 100;
426 if (x) varservice = x;
427 x = getenv("SVWAIT");
428 if (x) waitsec = xatoul(x);
430 opt = getopt32(argv, "w:v", &x);
431 if (opt & 1) waitsec = xatoul(x); // -w
432 if (opt & 2) verbose = 1; // -v
436 if (!action || !*argv) usage();
442 curdir = open_read(".");
444 fatal_cannot("open current directory");
454 if (!verbose) cbk = NULL;
470 if (!str_diff(action, "check")) {
475 case 'u': case 'd': case 'o': case 't': case 'p': case 'h':
476 case 'a': case 'i': case 'k': case 'q': case '1': case '2':
479 if (!verbose) cbk = NULL;
482 if (!str_diff(action, "shutdown")) {
486 if (!str_diff(action, "start")) {
490 if (!str_diff(action, "stop")) {
499 if (!str_diff(action, "restart")) {
505 if (!str_diff(action, "force-reload")) {
510 if (!str_diff(action, "force-restart")) {
515 if (!str_diff(action, "force-shutdown")) {
520 if (!str_diff(action, "force-stop")) {
530 for (i = 0; i < services; ++i) {
531 if ((**service != '/') && (**service != '.')) {
532 if (chdir(varservice) == -1)
535 if (chdir(*service) == -1) {
537 fail("cannot change to service directory");
538 goto nullify_service_0;
540 if (act && (act(acts) == -1)) {
544 if (fchdir(curdir) == -1)
545 fatal_cannot("change to original directory");
553 //taia_sub(&tdiff, &tnow, &tstart);
554 diff = tnow.sec.x - tstart.sec.x;
557 for (i = 0; i < services; ++i, ++service) {
560 if ((**service != '/') && (**service != '.')) {
561 if (chdir(varservice) == -1)
564 if (chdir(*service) == -1) {
566 fail("cannot change to service directory");
567 goto nullify_service;
570 goto nullify_service;
572 if (diff >= waitsec) {
573 printf(kll ? "kill: " : "timeout: ");
574 if (svstatus_get() > 0) {
575 svstatus_print(*service);
578 puts(""); /* will also flush the output */
584 if (fchdir(curdir) == -1)
585 fatal_cannot("change to original directory");
587 if (want_exit) break;
591 return rc > 99 ? 99 : rc;