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function old new delta runsv_main 1770 1786 +16 svstatus_get 176 188 +12 sv_main 1180 1186 +6 runsvdir_main 683 689 +6 processorstart 385 391 +6 control 126 132 +6 logdir_open 1184 1187 +3 lock_exnb 14 - -14 lock_ex 14 - -14 open_write 17 - -17 open_read 17 - -17 ------------------------------------------------------------------------------ (add/remove: 0/5 grow/shrink: 7/0 up/down: 55/-62) Total: -7 bytes Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
394 lines
9.5 KiB
C
394 lines
9.5 KiB
C
/*
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Copyright (c) 2001-2006, Gerrit Pape
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. The name of the author may not be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* Busyboxed by Denys Vlasenko <vda.linux@googlemail.com> */
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/* TODO: depends on runit_lib.c - review and reduce/eliminate */
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#include <sys/poll.h>
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#include <sys/file.h>
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#include "libbb.h"
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#include "runit_lib.h"
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#define MAXSERVICES 1000
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/* Should be not needed - all dirs are on same FS, right? */
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#define CHECK_DEVNO_TOO 0
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struct service {
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#if CHECK_DEVNO_TOO
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dev_t dev;
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#endif
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ino_t ino;
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pid_t pid;
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smallint isgone;
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};
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struct globals {
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struct service *sv;
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char *svdir;
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int svnum;
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#if ENABLE_FEATURE_RUNSVDIR_LOG
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char *rplog;
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int rploglen;
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struct fd_pair logpipe;
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struct pollfd pfd[1];
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unsigned stamplog;
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#endif
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} FIX_ALIASING;
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#define G (*(struct globals*)&bb_common_bufsiz1)
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#define sv (G.sv )
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#define svdir (G.svdir )
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#define svnum (G.svnum )
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#define rplog (G.rplog )
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#define rploglen (G.rploglen )
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#define logpipe (G.logpipe )
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#define pfd (G.pfd )
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#define stamplog (G.stamplog )
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#define INIT_G() do { \
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} while (0)
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static void fatal2_cannot(const char *m1, const char *m2)
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{
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bb_perror_msg_and_die("%s: fatal: can't %s%s", svdir, m1, m2);
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/* was exiting 100 */
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}
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static void warn3x(const char *m1, const char *m2, const char *m3)
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{
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bb_error_msg("%s: warning: %s%s%s", svdir, m1, m2, m3);
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}
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static void warn2_cannot(const char *m1, const char *m2)
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{
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warn3x("can't ", m1, m2);
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}
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#if ENABLE_FEATURE_RUNSVDIR_LOG
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static void warnx(const char *m1)
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{
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warn3x(m1, "", "");
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}
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#endif
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/* inlining + vfork -> bigger code */
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static NOINLINE pid_t runsv(const char *name)
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{
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pid_t pid;
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/* If we got signaled, stop spawning children at once! */
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if (bb_got_signal)
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return 0;
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pid = vfork();
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if (pid == -1) {
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warn2_cannot("vfork", "");
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return 0;
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}
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if (pid == 0) {
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/* child */
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if (option_mask32 & 1) /* -P option? */
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setsid();
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/* man execv:
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* "Signals set to be caught by the calling process image
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* shall be set to the default action in the new process image."
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* Therefore, we do not need this: */
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#if 0
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bb_signals(0
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| (1 << SIGHUP)
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| (1 << SIGTERM)
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, SIG_DFL);
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#endif
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execlp("runsv", "runsv", name, (char *) NULL);
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fatal2_cannot("start runsv ", name);
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}
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return pid;
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}
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/* gcc 4.3.0 does better with NOINLINE */
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static NOINLINE int do_rescan(void)
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{
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DIR *dir;
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struct dirent *d;
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int i;
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struct stat s;
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int need_rescan = 0;
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dir = opendir(".");
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if (!dir) {
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warn2_cannot("open directory ", svdir);
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return 1; /* need to rescan again soon */
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}
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for (i = 0; i < svnum; i++)
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sv[i].isgone = 1;
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while (1) {
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errno = 0;
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d = readdir(dir);
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if (!d)
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break;
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if (d->d_name[0] == '.')
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continue;
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if (stat(d->d_name, &s) == -1) {
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warn2_cannot("stat ", d->d_name);
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continue;
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}
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if (!S_ISDIR(s.st_mode))
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continue;
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/* Do we have this service listed already? */
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for (i = 0; i < svnum; i++) {
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if ((sv[i].ino == s.st_ino)
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#if CHECK_DEVNO_TOO
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&& (sv[i].dev == s.st_dev)
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#endif
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) {
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if (sv[i].pid == 0) /* restart if it has died */
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goto run_ith_sv;
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sv[i].isgone = 0; /* "we still see you" */
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goto next_dentry;
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}
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}
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{ /* Not found, make new service */
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struct service *svnew = realloc(sv, (i+1) * sizeof(*sv));
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if (!svnew) {
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warn2_cannot("start runsv ", d->d_name);
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need_rescan = 1;
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continue;
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}
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sv = svnew;
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svnum++;
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#if CHECK_DEVNO_TOO
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sv[i].dev = s.st_dev;
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#endif
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sv[i].ino = s.st_ino;
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run_ith_sv:
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sv[i].pid = runsv(d->d_name);
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sv[i].isgone = 0;
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}
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next_dentry: ;
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}
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i = errno;
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closedir(dir);
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if (i) { /* readdir failed */
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warn2_cannot("read directory ", svdir);
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return 1; /* need to rescan again soon */
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}
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/* Send SIGTERM to runsv whose directories
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* were no longer found (-> must have been removed) */
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for (i = 0; i < svnum; i++) {
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if (!sv[i].isgone)
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continue;
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if (sv[i].pid)
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kill(sv[i].pid, SIGTERM);
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svnum--;
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sv[i] = sv[svnum];
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i--; /* so that we don't skip new sv[i] (bug was here!) */
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}
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return need_rescan;
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}
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int runsvdir_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int runsvdir_main(int argc UNUSED_PARAM, char **argv)
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{
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struct stat s;
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dev_t last_dev = last_dev; /* for gcc */
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ino_t last_ino = last_ino; /* for gcc */
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time_t last_mtime = 0;
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int wstat;
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int curdir;
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pid_t pid;
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unsigned deadline;
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unsigned now;
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unsigned stampcheck;
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int i;
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int need_rescan = 1;
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char *opt_s_argv[3];
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INIT_G();
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opt_complementary = "-1";
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opt_s_argv[0] = NULL;
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opt_s_argv[2] = NULL;
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getopt32(argv, "Ps:", &opt_s_argv[0]);
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argv += optind;
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bb_signals(0
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| (1 << SIGTERM)
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| (1 << SIGHUP)
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/* For busybox's init, SIGTERM == reboot,
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* SIGUSR1 == halt
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* SIGUSR2 == poweroff
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* so we need to intercept SIGUSRn too.
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* Note that we do not implement actual reboot
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* (killall(TERM) + umount, etc), we just pause
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* respawing and avoid exiting (-> making kernel oops).
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* The user is responsible for the rest. */
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| (getpid() == 1 ? ((1 << SIGUSR1) | (1 << SIGUSR2)) : 0)
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, record_signo);
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svdir = *argv++;
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#if ENABLE_FEATURE_RUNSVDIR_LOG
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/* setup log */
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if (*argv) {
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rplog = *argv;
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rploglen = strlen(rplog);
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if (rploglen < 7) {
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warnx("log must have at least seven characters");
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} else if (piped_pair(logpipe)) {
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warnx("can't create pipe for log");
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} else {
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close_on_exec_on(logpipe.rd);
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close_on_exec_on(logpipe.wr);
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ndelay_on(logpipe.rd);
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ndelay_on(logpipe.wr);
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if (dup2(logpipe.wr, 2) == -1) {
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warnx("can't set filedescriptor for log");
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} else {
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pfd[0].fd = logpipe.rd;
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pfd[0].events = POLLIN;
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stamplog = monotonic_sec();
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goto run;
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}
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}
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rplog = NULL;
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warnx("log service disabled");
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}
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run:
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#endif
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curdir = open(".", O_RDONLY|O_NDELAY);
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if (curdir == -1)
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fatal2_cannot("open current directory", "");
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close_on_exec_on(curdir);
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stampcheck = monotonic_sec();
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for (;;) {
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/* collect children */
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for (;;) {
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pid = wait_any_nohang(&wstat);
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if (pid <= 0)
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break;
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for (i = 0; i < svnum; i++) {
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if (pid == sv[i].pid) {
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/* runsv has died */
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sv[i].pid = 0;
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need_rescan = 1;
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}
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}
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}
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now = monotonic_sec();
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if ((int)(now - stampcheck) >= 0) {
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/* wait at least a second */
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stampcheck = now + 1;
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if (stat(svdir, &s) != -1) {
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if (need_rescan || s.st_mtime != last_mtime
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|| s.st_ino != last_ino || s.st_dev != last_dev
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) {
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/* svdir modified */
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if (chdir(svdir) != -1) {
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last_mtime = s.st_mtime;
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last_dev = s.st_dev;
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last_ino = s.st_ino;
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//if (now <= mtime)
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// sleep(1);
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need_rescan = do_rescan();
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while (fchdir(curdir) == -1) {
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warn2_cannot("change directory, pausing", "");
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sleep(5);
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}
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} else {
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warn2_cannot("change directory to ", svdir);
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}
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}
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} else {
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warn2_cannot("stat ", svdir);
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}
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}
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#if ENABLE_FEATURE_RUNSVDIR_LOG
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if (rplog) {
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if ((int)(now - stamplog) >= 0) {
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write(logpipe.wr, ".", 1);
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stamplog = now + 900;
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}
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}
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pfd[0].revents = 0;
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#endif
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deadline = (need_rescan ? 1 : 5);
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sig_block(SIGCHLD);
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#if ENABLE_FEATURE_RUNSVDIR_LOG
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if (rplog)
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poll(pfd, 1, deadline*1000);
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else
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#endif
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sleep(deadline);
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sig_unblock(SIGCHLD);
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#if ENABLE_FEATURE_RUNSVDIR_LOG
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if (pfd[0].revents & POLLIN) {
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char ch;
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while (read(logpipe.rd, &ch, 1) > 0) {
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if (ch < ' ')
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ch = ' ';
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for (i = 6; i < rploglen; i++)
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rplog[i-1] = rplog[i];
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rplog[rploglen-1] = ch;
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}
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}
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#endif
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if (!bb_got_signal)
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continue;
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/* -s SCRIPT: useful if we are init.
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* In this case typically script never returns,
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* it halts/powers off/reboots the system. */
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if (opt_s_argv[0]) {
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/* Single parameter: signal# */
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opt_s_argv[1] = utoa(bb_got_signal);
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pid = spawn(opt_s_argv);
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if (pid > 0) {
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/* Remembering to wait for _any_ children,
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* not just pid */
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while (wait(NULL) != pid)
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continue;
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}
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}
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if (bb_got_signal == SIGHUP) {
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for (i = 0; i < svnum; i++)
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if (sv[i].pid)
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kill(sv[i].pid, SIGTERM);
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}
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/* SIGHUP or SIGTERM (or SIGUSRn if we are init) */
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/* Exit unless we are init */
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if (getpid() != 1)
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return (SIGHUP == bb_got_signal) ? 111 : EXIT_SUCCESS;
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/* init continues to monitor services forever */
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bb_got_signal = 0;
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} /* for (;;) */
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}
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