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,
20 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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
24 OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 /* Busyboxed by Denys Vlasenko <vda.linux@googlemail.com> */
29 /* TODO: depends on runit_lib.c - review and reduce/eliminate */
34 #include "runit_lib.h"
36 #if ENABLE_MONOTONIC_SYSCALL
37 #include <sys/syscall.h>
39 /* libc has incredibly messy way of doing this,
40 * typically requiring -lrt. We just skip all this mess */
41 static void gettimeofday_ns(struct timespec *ts)
43 syscall(__NR_clock_gettime, CLOCK_REALTIME, ts);
46 static void gettimeofday_ns(struct timespec *ts)
48 if (sizeof(struct timeval) == sizeof(struct timespec)
49 && sizeof(((struct timeval*)ts)->tv_usec) == sizeof(ts->tv_nsec)
52 gettimeofday((void*)ts, NULL);
55 extern void BUG_need_to_implement_gettimeofday_ns(void);
56 BUG_need_to_implement_gettimeofday_ns();
61 /* Compare possibly overflowing unsigned counters */
62 #define LESS(a,b) ((int)((unsigned)(b) - (unsigned)(a)) > 0)
83 struct timespec start;
93 struct fd_pair selfpipe;
94 struct fd_pair logpipe;
98 #define G (*(struct globals*)&bb_common_bufsiz1)
99 #define haslog (G.haslog )
100 #define sigterm (G.sigterm )
101 #define pidchanged (G.pidchanged )
102 #define selfpipe (G.selfpipe )
103 #define logpipe (G.logpipe )
106 #define INIT_G() do { \
110 static void fatal2_cannot(const char *m1, const char *m2)
112 bb_perror_msg_and_die("%s: fatal: cannot %s%s", dir, m1, m2);
113 /* was exiting 111 */
115 static void fatal_cannot(const char *m)
117 fatal2_cannot(m, "");
118 /* was exiting 111 */
120 static void fatal2x_cannot(const char *m1, const char *m2)
122 bb_error_msg_and_die("%s: fatal: cannot %s%s", dir, m1, m2);
123 /* was exiting 111 */
125 static void warn_cannot(const char *m)
127 bb_perror_msg("%s: warning: cannot %s", dir, m);
130 static void s_child(int sig_no UNUSED_PARAM)
132 write(selfpipe.wr, "", 1);
135 static void s_term(int sig_no UNUSED_PARAM)
138 write(selfpipe.wr, "", 1); /* XXX */
141 static char *add_str(char *p, const char *to_add)
143 while ((*p = *to_add) != '\0') {
150 static int open_trunc_or_warn(const char *name)
152 int fd = open_trunc(name);
154 bb_perror_msg("%s: warning: cannot open %s",
159 static void update_status(struct svdir *s)
167 fd = open_trunc_or_warn("supervise/pid.new");
171 char spid[sizeof(int)*3 + 2];
172 int size = sprintf(spid, "%u\n", (unsigned)s->pid);
173 write(fd, spid, size);
176 if (rename_or_warn("supervise/pid.new",
177 s->islog ? "log/supervise/pid" : "log/supervise/pid"+4))
183 fd = open_trunc_or_warn("supervise/stat.new");
188 char stat_buf[sizeof("finish, paused, got TERM, want down\n")];
192 p = add_str(p, "down");
195 p = add_str(p, "run");
198 p = add_str(p, "finish");
201 if (s->ctrl & C_PAUSE) p = add_str(p, ", paused");
202 if (s->ctrl & C_TERM) p = add_str(p, ", got TERM");
203 if (s->state != S_DOWN)
206 p = add_str(p, ", want down");
209 p = add_str(p, ", want exit");
213 write(fd, stat_buf, p - stat_buf);
217 rename_or_warn("supervise/stat.new",
218 s->islog ? "log/supervise/stat" : "log/supervise/stat"+4);
220 /* supervise compatibility */
221 memset(&status, 0, sizeof(status));
222 status.time_be64 = SWAP_BE64(s->start.tv_sec + 0x400000000000000aULL);
223 status.time_nsec_be32 = SWAP_BE32(s->start.tv_nsec);
224 status.pid_le32 = SWAP_LE32(s->pid);
225 if (s->ctrl & C_PAUSE)
231 if (s->ctrl & C_TERM)
233 status.run_or_finish = s->state;
234 fd = open_trunc_or_warn("supervise/status.new");
237 sz = write(fd, &status, sizeof(status));
239 if (sz != sizeof(status)) {
240 warn_cannot("write supervise/status.new");
241 unlink("supervise/status.new");
244 rename_or_warn("supervise/status.new",
245 s->islog ? "log/supervise/status" : "log/supervise/status"+4);
248 static unsigned custom(struct svdir *s, char c)
255 if (s->islog) return 0;
256 strcpy(a, "control/?");
257 a[8] = c; /* replace '?' */
258 if (stat(a, &st) == 0) {
259 if (st.st_mode & S_IXUSR) {
262 warn_cannot("vfork for control/?");
267 if (haslog && dup2(logpipe.wr, 1) == -1)
268 warn_cannot("setup stdout for control/?");
269 execl(a, a, (char *) NULL);
270 fatal_cannot("run control/?");
273 if (safe_waitpid(pid, &w, 0) == -1) {
274 warn_cannot("wait for child control/?");
277 return !wait_exitcode(w);
281 warn_cannot("stat control/?");
286 static void stopservice(struct svdir *s)
288 if (s->pid && !custom(s, 't')) {
289 kill(s->pid, SIGTERM);
293 if (s->want == W_DOWN) {
294 kill(s->pid, SIGCONT);
298 if (s->want == W_EXIT) {
299 kill(s->pid, SIGCONT);
304 static void startservice(struct svdir *s)
309 if (s->state == S_FINISH)
317 stopservice(s); /* should never happen */
318 while ((p = vfork()) == -1) {
319 warn_cannot("vfork, sleeping");
325 /* NB: bug alert! right order is close, then dup2 */
329 xdup2(logpipe.rd, 0);
332 xdup2(logpipe.wr, 1);
335 /* Non-ignored signals revert to SIG_DFL on exec anyway */
340 sig_unblock(SIGCHLD);
341 sig_unblock(SIGTERM);
342 execl(run, run, (char *) NULL);
343 fatal2_cannot(s->islog ? "start log/" : "start ", run);
346 if (s->state != S_FINISH) {
347 gettimeofday_ns(&s->start);
356 static int ctrl(struct svdir *s, char c)
364 if (s->pid && s->state != S_FINISH)
379 case 't': /* sig term */
380 if (s->pid && s->state != S_FINISH)
383 case 'k': /* sig kill */
384 if (s->pid && !custom(s, c))
385 kill(s->pid, SIGKILL);
388 case 'p': /* sig pause */
389 if (s->pid && !custom(s, c))
390 kill(s->pid, SIGSTOP);
394 case 'c': /* sig cont */
395 if (s->pid && !custom(s, c))
396 kill(s->pid, SIGCONT);
406 case 'a': /* sig alarm */
409 case 'h': /* sig hup */
412 case 'i': /* sig int */
415 case 'q': /* sig quit */
418 case '1': /* sig usr1 */
421 case '2': /* sig usr2 */
427 if (s->pid && !custom(s, c))
432 int runsv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
433 int runsv_main(int argc UNUSED_PARAM, char **argv)
442 if (!argv[1] || argv[2])
446 xpiped_pair(selfpipe);
447 close_on_exec_on(selfpipe.rd);
448 close_on_exec_on(selfpipe.wr);
449 ndelay_on(selfpipe.rd);
450 ndelay_on(selfpipe.wr);
453 bb_signals_recursive_norestart(1 << SIGCHLD, s_child);
455 bb_signals_recursive_norestart(1 << SIGTERM, s_term);
458 /* bss: svd[0].pid = 0; */
459 if (S_DOWN) svd[0].state = S_DOWN; /* otherwise already 0 (bss) */
460 if (C_NOOP) svd[0].ctrl = C_NOOP;
461 if (W_UP) svd[0].want = W_UP;
462 /* bss: svd[0].islog = 0; */
463 /* bss: svd[1].pid = 0; */
464 gettimeofday_ns(&svd[0].start);
465 if (stat("down", &s) != -1) svd[0].want = W_DOWN;
467 if (stat("log", &s) == -1) {
469 warn_cannot("stat ./log");
471 if (!S_ISDIR(s.st_mode)) {
473 warn_cannot("stat log/down: log is not a directory");
476 svd[1].state = S_DOWN;
477 svd[1].ctrl = C_NOOP;
480 gettimeofday_ns(&svd[1].start);
481 if (stat("log/down", &s) != -1)
482 svd[1].want = W_DOWN;
483 xpiped_pair(logpipe);
484 close_on_exec_on(logpipe.rd);
485 close_on_exec_on(logpipe.wr);
489 if (mkdir("supervise", 0700) == -1) {
490 r = readlink("supervise", buf, sizeof(buf));
492 if (r == sizeof(buf))
493 fatal2x_cannot("readlink ./supervise", ": name too long");
497 if ((errno != ENOENT) && (errno != EINVAL))
498 fatal_cannot("readlink ./supervise");
501 svd[0].fdlock = xopen3("log/supervise/lock"+4,
502 O_WRONLY|O_NDELAY|O_APPEND|O_CREAT, 0600);
503 if (lock_exnb(svd[0].fdlock) == -1)
504 fatal_cannot("lock supervise/lock");
505 close_on_exec_on(svd[0].fdlock);
507 if (mkdir("log/supervise", 0700) == -1) {
508 r = readlink("log/supervise", buf, 256);
511 fatal2x_cannot("readlink ./log/supervise", ": name too long");
513 fd = xopen(".", O_RDONLY|O_NDELAY);
516 if (fchdir(fd) == -1)
517 fatal_cannot("change back to service directory");
521 if ((errno != ENOENT) && (errno != EINVAL))
522 fatal_cannot("readlink ./log/supervise");
525 svd[1].fdlock = xopen3("log/supervise/lock",
526 O_WRONLY|O_NDELAY|O_APPEND|O_CREAT, 0600);
527 if (lock_ex(svd[1].fdlock) == -1)
528 fatal_cannot("lock log/supervise/lock");
529 close_on_exec_on(svd[1].fdlock);
532 mkfifo("log/supervise/control"+4, 0600);
533 svd[0].fdcontrol = xopen("log/supervise/control"+4, O_RDONLY|O_NDELAY);
534 close_on_exec_on(svd[0].fdcontrol);
535 svd[0].fdcontrolwrite = xopen("log/supervise/control"+4, O_WRONLY|O_NDELAY);
536 close_on_exec_on(svd[0].fdcontrolwrite);
537 update_status(&svd[0]);
539 mkfifo("log/supervise/control", 0600);
540 svd[1].fdcontrol = xopen("log/supervise/control", O_RDONLY|O_NDELAY);
541 close_on_exec_on(svd[1].fdcontrol);
542 svd[1].fdcontrolwrite = xopen("log/supervise/control", O_WRONLY|O_NDELAY);
543 close_on_exec_on(svd[1].fdcontrolwrite);
544 update_status(&svd[1]);
546 mkfifo("log/supervise/ok"+4, 0600);
547 fd = xopen("log/supervise/ok"+4, O_RDONLY|O_NDELAY);
548 close_on_exec_on(fd);
550 mkfifo("log/supervise/ok", 0600);
551 fd = xopen("log/supervise/ok", O_RDONLY|O_NDELAY);
552 close_on_exec_on(fd);
560 if (!svd[1].pid && svd[1].want == W_UP)
561 startservice(&svd[1]);
563 if (svd[0].want == W_UP || svd[0].state == S_FINISH)
564 startservice(&svd[0]);
566 x[0].fd = selfpipe.rd;
567 x[0].events = POLLIN;
568 x[1].fd = svd[0].fdcontrol;
569 x[1].events = POLLIN;
570 /* x[2] is used only if haslog == 1 */
571 x[2].fd = svd[1].fdcontrol;
572 x[2].events = POLLIN;
573 sig_unblock(SIGTERM);
574 sig_unblock(SIGCHLD);
575 poll(x, 2 + haslog, 3600*1000);
579 while (read(selfpipe.rd, &ch, 1) == 1)
586 child = wait_any_nohang(&wstat);
589 if ((child == -1) && (errno != EINTR))
591 if (child == svd[0].pid) {
594 svd[0].ctrl &=~ C_TERM;
595 if (svd[0].state != S_FINISH) {
596 fd = open_read("finish");
599 svd[0].state = S_FINISH;
600 update_status(&svd[0]);
604 svd[0].state = S_DOWN;
605 deadline = svd[0].start.tv_sec + 1;
606 gettimeofday_ns(&svd[0].start);
607 update_status(&svd[0]);
608 if (LESS(svd[0].start.tv_sec, deadline))
612 if (child == svd[1].pid) {
615 svd[1].state = S_DOWN;
616 svd[1].ctrl &= ~C_TERM;
617 deadline = svd[1].start.tv_sec + 1;
618 gettimeofday_ns(&svd[1].start);
619 update_status(&svd[1]);
620 if (LESS(svd[1].start.tv_sec, deadline))
625 if (read(svd[0].fdcontrol, &ch, 1) == 1)
628 if (read(svd[1].fdcontrol, &ch, 1) == 1)
636 if (svd[0].want == W_EXIT && svd[0].state == S_DOWN) {
639 if (svd[1].want != W_EXIT) {
640 svd[1].want = W_EXIT;
641 /* stopservice(&svd[1]); */
642 update_status(&svd[1]);