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Diffstat (limited to 'release/src/router/busybox/runit/runsvdir.c')
-rw-r--r--release/src/router/busybox/runit/runsvdir.c393
1 files changed, 393 insertions, 0 deletions
diff --git a/release/src/router/busybox/runit/runsvdir.c b/release/src/router/busybox/runit/runsvdir.c
new file mode 100644
index 00000000..a77bc3fd
--- /dev/null
+++ b/release/src/router/busybox/runit/runsvdir.c
@@ -0,0 +1,393 @@
+/*
+Copyright (c) 2001-2006, Gerrit Pape
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+ 1. Redistributions of source code must retain the above copyright notice,
+ this list of conditions and the following disclaimer.
+ 2. Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+ 3. The name of the author may not be used to endorse or promote products
+ derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+/* Busyboxed by Denys Vlasenko <vda.linux@googlemail.com> */
+/* TODO: depends on runit_lib.c - review and reduce/eliminate */
+
+#include <sys/poll.h>
+#include <sys/file.h>
+#include "libbb.h"
+#include "runit_lib.h"
+
+#define MAXSERVICES 1000
+
+/* Should be not needed - all dirs are on same FS, right? */
+#define CHECK_DEVNO_TOO 0
+
+struct service {
+#if CHECK_DEVNO_TOO
+ dev_t dev;
+#endif
+ ino_t ino;
+ pid_t pid;
+ smallint isgone;
+};
+
+struct globals {
+ struct service *sv;
+ char *svdir;
+ int svnum;
+#if ENABLE_FEATURE_RUNSVDIR_LOG
+ char *rplog;
+ int rploglen;
+ struct fd_pair logpipe;
+ struct pollfd pfd[1];
+ unsigned stamplog;
+#endif
+};
+#define G (*(struct globals*)&bb_common_bufsiz1)
+#define sv (G.sv )
+#define svdir (G.svdir )
+#define svnum (G.svnum )
+#define rplog (G.rplog )
+#define rploglen (G.rploglen )
+#define logpipe (G.logpipe )
+#define pfd (G.pfd )
+#define stamplog (G.stamplog )
+#define INIT_G() do { \
+} while (0)
+
+static void fatal2_cannot(const char *m1, const char *m2)
+{
+ bb_perror_msg_and_die("%s: fatal: cannot %s%s", svdir, m1, m2);
+ /* was exiting 100 */
+}
+static void warn3x(const char *m1, const char *m2, const char *m3)
+{
+ bb_error_msg("%s: warning: %s%s%s", svdir, m1, m2, m3);
+}
+static void warn2_cannot(const char *m1, const char *m2)
+{
+ warn3x("cannot ", m1, m2);
+}
+#if ENABLE_FEATURE_RUNSVDIR_LOG
+static void warnx(const char *m1)
+{
+ warn3x(m1, "", "");
+}
+#endif
+
+/* inlining + vfork -> bigger code */
+static NOINLINE pid_t runsv(const char *name)
+{
+ pid_t pid;
+
+ /* If we got signaled, stop spawning children at once! */
+ if (bb_got_signal)
+ return 0;
+
+ pid = vfork();
+ if (pid == -1) {
+ warn2_cannot("vfork", "");
+ return 0;
+ }
+ if (pid == 0) {
+ /* child */
+ if (option_mask32 & 1) /* -P option? */
+ setsid();
+/* man execv:
+ * "Signals set to be caught by the calling process image
+ * shall be set to the default action in the new process image."
+ * Therefore, we do not need this: */
+#if 0
+ bb_signals(0
+ | (1 << SIGHUP)
+ | (1 << SIGTERM)
+ , SIG_DFL);
+#endif
+ execlp("runsv", "runsv", name, (char *) NULL);
+ fatal2_cannot("start runsv ", name);
+ }
+ return pid;
+}
+
+/* gcc 4.3.0 does better with NOINLINE */
+static NOINLINE int do_rescan(void)
+{
+ DIR *dir;
+ direntry *d;
+ int i;
+ struct stat s;
+ int need_rescan = 0;
+
+ dir = opendir(".");
+ if (!dir) {
+ warn2_cannot("open directory ", svdir);
+ return 1; /* need to rescan again soon */
+ }
+ for (i = 0; i < svnum; i++)
+ sv[i].isgone = 1;
+
+ while (1) {
+ errno = 0;
+ d = readdir(dir);
+ if (!d)
+ break;
+ if (d->d_name[0] == '.')
+ continue;
+ if (stat(d->d_name, &s) == -1) {
+ warn2_cannot("stat ", d->d_name);
+ continue;
+ }
+ if (!S_ISDIR(s.st_mode))
+ continue;
+ /* Do we have this service listed already? */
+ for (i = 0; i < svnum; i++) {
+ if ((sv[i].ino == s.st_ino)
+#if CHECK_DEVNO_TOO
+ && (sv[i].dev == s.st_dev)
+#endif
+ ) {
+ if (sv[i].pid == 0) /* restart if it has died */
+ goto run_ith_sv;
+ sv[i].isgone = 0; /* "we still see you" */
+ goto next_dentry;
+ }
+ }
+ { /* Not found, make new service */
+ struct service *svnew = realloc(sv, (i+1) * sizeof(*sv));
+ if (!svnew) {
+ warn2_cannot("start runsv ", d->d_name);
+ need_rescan = 1;
+ continue;
+ }
+ sv = svnew;
+ svnum++;
+#if CHECK_DEVNO_TOO
+ sv[i].dev = s.st_dev;
+#endif
+ sv[i].ino = s.st_ino;
+ run_ith_sv:
+ sv[i].pid = runsv(d->d_name);
+ sv[i].isgone = 0;
+ }
+ next_dentry: ;
+ }
+ i = errno;
+ closedir(dir);
+ if (i) { /* readdir failed */
+ warn2_cannot("read directory ", svdir);
+ return 1; /* need to rescan again soon */
+ }
+
+ /* Send SIGTERM to runsv whose directories
+ * were no longer found (-> must have been removed) */
+ for (i = 0; i < svnum; i++) {
+ if (!sv[i].isgone)
+ continue;
+ if (sv[i].pid)
+ kill(sv[i].pid, SIGTERM);
+ svnum--;
+ sv[i] = sv[svnum];
+ i--; /* so that we don't skip new sv[i] (bug was here!) */
+ }
+ return need_rescan;
+}
+
+int runsvdir_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int runsvdir_main(int argc UNUSED_PARAM, char **argv)
+{
+ struct stat s;
+ dev_t last_dev = last_dev; /* for gcc */
+ ino_t last_ino = last_ino; /* for gcc */
+ time_t last_mtime = 0;
+ int wstat;
+ int curdir;
+ pid_t pid;
+ unsigned deadline;
+ unsigned now;
+ unsigned stampcheck;
+ int i;
+ int need_rescan = 1;
+ char *opt_s_argv[3];
+
+ INIT_G();
+
+ opt_complementary = "-1";
+ opt_s_argv[0] = NULL;
+ opt_s_argv[2] = NULL;
+ getopt32(argv, "Ps:", &opt_s_argv[0]);
+ argv += optind;
+
+ bb_signals(0
+ | (1 << SIGTERM)
+ | (1 << SIGHUP)
+ /* For busybox's init, SIGTERM == reboot,
+ * SIGUSR1 == halt
+ * SIGUSR2 == poweroff
+ * so we need to intercept SIGUSRn too.
+ * Note that we do not implement actual reboot
+ * (killall(TERM) + umount, etc), we just pause
+ * respawing and avoid exiting (-> making kernel oops).
+ * The user is responsible for the rest. */
+ | (getpid() == 1 ? ((1 << SIGUSR1) | (1 << SIGUSR2)) : 0)
+ , record_signo);
+ svdir = *argv++;
+
+#if ENABLE_FEATURE_RUNSVDIR_LOG
+ /* setup log */
+ if (*argv) {
+ rplog = *argv;
+ rploglen = strlen(rplog);
+ if (rploglen < 7) {
+ warnx("log must have at least seven characters");
+ } else if (piped_pair(logpipe)) {
+ warnx("cannot create pipe for log");
+ } else {
+ close_on_exec_on(logpipe.rd);
+ close_on_exec_on(logpipe.wr);
+ ndelay_on(logpipe.rd);
+ ndelay_on(logpipe.wr);
+ if (dup2(logpipe.wr, 2) == -1) {
+ warnx("cannot set filedescriptor for log");
+ } else {
+ pfd[0].fd = logpipe.rd;
+ pfd[0].events = POLLIN;
+ stamplog = monotonic_sec();
+ goto run;
+ }
+ }
+ rplog = NULL;
+ warnx("log service disabled");
+ }
+ run:
+#endif
+ curdir = open_read(".");
+ if (curdir == -1)
+ fatal2_cannot("open current directory", "");
+ close_on_exec_on(curdir);
+
+ stampcheck = monotonic_sec();
+
+ for (;;) {
+ /* collect children */
+ for (;;) {
+ pid = wait_any_nohang(&wstat);
+ if (pid <= 0)
+ break;
+ for (i = 0; i < svnum; i++) {
+ if (pid == sv[i].pid) {
+ /* runsv has died */
+ sv[i].pid = 0;
+ need_rescan = 1;
+ }
+ }
+ }
+
+ now = monotonic_sec();
+ if ((int)(now - stampcheck) >= 0) {
+ /* wait at least a second */
+ stampcheck = now + 1;
+
+ if (stat(svdir, &s) != -1) {
+ if (need_rescan || s.st_mtime != last_mtime
+ || s.st_ino != last_ino || s.st_dev != last_dev
+ ) {
+ /* svdir modified */
+ if (chdir(svdir) != -1) {
+ last_mtime = s.st_mtime;
+ last_dev = s.st_dev;
+ last_ino = s.st_ino;
+ //if (now <= mtime)
+ // sleep(1);
+ need_rescan = do_rescan();
+ while (fchdir(curdir) == -1) {
+ warn2_cannot("change directory, pausing", "");
+ sleep(5);
+ }
+ } else {
+ warn2_cannot("change directory to ", svdir);
+ }
+ }
+ } else {
+ warn2_cannot("stat ", svdir);
+ }
+ }
+
+#if ENABLE_FEATURE_RUNSVDIR_LOG
+ if (rplog) {
+ if ((int)(now - stamplog) >= 0) {
+ write(logpipe.wr, ".", 1);
+ stamplog = now + 900;
+ }
+ }
+ pfd[0].revents = 0;
+#endif
+ deadline = (need_rescan ? 1 : 5);
+ sig_block(SIGCHLD);
+#if ENABLE_FEATURE_RUNSVDIR_LOG
+ if (rplog)
+ poll(pfd, 1, deadline*1000);
+ else
+#endif
+ sleep(deadline);
+ sig_unblock(SIGCHLD);
+
+#if ENABLE_FEATURE_RUNSVDIR_LOG
+ if (pfd[0].revents & POLLIN) {
+ char ch;
+ while (read(logpipe.rd, &ch, 1) > 0) {
+ if (ch < ' ')
+ ch = ' ';
+ for (i = 6; i < rploglen; i++)
+ rplog[i-1] = rplog[i];
+ rplog[rploglen-1] = ch;
+ }
+ }
+#endif
+ if (!bb_got_signal)
+ continue;
+
+ /* -s SCRIPT: useful if we are init.
+ * In this case typically script never returns,
+ * it halts/powers off/reboots the system. */
+ if (opt_s_argv[0]) {
+ /* Single parameter: signal# */
+ opt_s_argv[1] = utoa(bb_got_signal);
+ pid = spawn(opt_s_argv);
+ if (pid > 0) {
+ /* Remembering to wait for _any_ children,
+ * not just pid */
+ while (wait(NULL) != pid)
+ continue;
+ }
+ }
+
+ if (bb_got_signal == SIGHUP) {
+ for (i = 0; i < svnum; i++)
+ if (sv[i].pid)
+ kill(sv[i].pid, SIGTERM);
+ }
+ /* SIGHUP or SIGTERM (or SIGUSRn if we are init) */
+ /* Exit unless we are init */
+ if (getpid() != 1)
+ return (SIGHUP == bb_got_signal) ? 111 : EXIT_SUCCESS;
+
+ /* init continues to monitor services forever */
+ bb_got_signal = 0;
+ } /* for (;;) */
+}
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