start-stop-daemon: create pidfile before parent exits, closes 8596
This removes DAEMON_DOUBLE_FORK flag from bb_daemonize_or_rexec(), as SSD was the only user. Also includes fix for -S: now works without -a and -x, does not print pids (compat with "start-stop-daemon (OpenRC) 0.34.11 (Gentoo Linux)"). function old new delta start_stop_daemon_main 1018 1084 +66 add_interface 99 103 +4 fail_hunk 139 136 -3 bb_daemonize_or_rexec 205 183 -22 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 2/2 up/down: 70/-25) Total: 45 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
b67d900395
commit
088fec36fe
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@ -409,7 +409,7 @@ int start_stop_daemon_main(int argc UNUSED_PARAM, char **argv)
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{
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unsigned opt;
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char *signame;
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char *startas;
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char *startas = NULL;
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char *chuid;
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#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
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// char *retry_arg = NULL;
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@ -425,10 +425,11 @@ int start_stop_daemon_main(int argc UNUSED_PARAM, char **argv)
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/* -K or -S is required; they are mutually exclusive */
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/* -p is required if -m is given */
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/* -xpun (at least one) is required if -K is given */
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/* -xa (at least one) is required if -S is given */
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// /* -xa (at least one) is required if -S is given */
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//WRONG: "start-stop-daemon -S -- sleep 5" is a valid invocation
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/* -q turns off -v */
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"\0"
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"K:S:K--S:S--K:m?p:K?xpun:S?xa"
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"K:S:K--S:S--K:m?p:K?xpun"
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IF_FEATURE_START_STOP_DAEMON_FANCY("q-v"),
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LONGOPTS
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&startas, &cmdname, &signame, &userspec, &chuid, &execname, &pidfile
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@ -442,21 +443,34 @@ int start_stop_daemon_main(int argc UNUSED_PARAM, char **argv)
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if (signal_nr < 0) bb_show_usage();
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}
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if (!(opt & OPT_a))
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startas = execname;
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if (!execname) /* in case -a is given and -x is not */
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//argc -= optind;
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argv += optind;
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// ARGS contains zeroth arg if -x/-a is not given, else it starts with 1st arg.
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// These will try to execute "[/bin/]sleep 5":
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// "start-stop-daemon -S -- sleep 5"
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// "start-stop-daemon -S -x /bin/sleep -- 5"
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// "start-stop-daemon -S -a sleep -- 5"
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// NB: -n option does _not_ behave in this way: this will try to execute "5":
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// "start-stop-daemon -S -n sleep -- 5"
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if (!execname) { /* -x is not given */
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execname = startas;
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if (execname) {
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G.execname_sizeof = strlen(execname) + 1;
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G.execname_cmpbuf = xmalloc(G.execname_sizeof + 1);
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if (!execname) { /* neither -x nor -a is given */
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execname = argv[0];
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if (!execname)
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bb_show_usage();
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argv++;
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}
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}
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if (!startas) /* -a is not given: use -x EXECUTABLE or argv[0] */
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startas = execname;
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*--argv = startas;
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G.execname_sizeof = strlen(execname) + 1;
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G.execname_cmpbuf = xmalloc(G.execname_sizeof + 1);
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// IF_FEATURE_START_STOP_DAEMON_FANCY(
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// if (retry_arg)
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// retries = xatoi_positive(retry_arg);
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// )
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//argc -= optind;
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argv += optind;
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if (userspec) {
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user_id = bb_strtou(userspec, NULL, 10);
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@ -473,7 +487,7 @@ int start_stop_daemon_main(int argc UNUSED_PARAM, char **argv)
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if (G.found_procs) {
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if (!QUIET)
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printf("%s is already running\n%u\n", execname, (unsigned)G.found_procs->pid);
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printf("%s is already running\n", execname);
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return !(opt & OPT_OKNODO);
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}
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@ -482,30 +496,37 @@ int start_stop_daemon_main(int argc UNUSED_PARAM, char **argv)
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xstat(execname, &G.execstat);
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#endif
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*--argv = startas;
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if (opt & OPT_BACKGROUND) {
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#if BB_MMU
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bb_daemonize(DAEMON_DEVNULL_STDIO + DAEMON_CLOSE_EXTRA_FDS + DAEMON_DOUBLE_FORK);
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/* DAEMON_DEVNULL_STDIO is superfluous -
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* it's always done by bb_daemonize() */
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#else
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/* Daemons usually call bb_daemonize_or_rexec(), but SSD can do
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* without: SSD is not itself a daemon, it _execs_ a daemon.
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* The usual NOMMU problem of "child can't run indefinitely,
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* it must exec" does not bite us: we exec anyway.
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*
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* bb_daemonize(DAEMON_DEVNULL_STDIO | DAEMON_CLOSE_EXTRA_FDS | DAEMON_DOUBLE_FORK)
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* can be used on MMU systems, but use of vfork()
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* is preferable since we want to create pidfile
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* _before_ parent returns, and vfork() on Linux
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* ensures that (by blocking parent until exec in the child).
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*/
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pid_t pid = xvfork();
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if (pid != 0) {
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/* parent */
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/* Parent */
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/* why _exit? the child may have changed the stack,
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* so "return 0" may do bad things */
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* so "return 0" may do bad things
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*/
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_exit(EXIT_SUCCESS);
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}
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/* Child */
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setsid(); /* detach from controlling tty */
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/* Redirect stdio to /dev/null, close extra FDs */
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bb_daemon_helper(DAEMON_DEVNULL_STDIO + DAEMON_CLOSE_EXTRA_FDS);
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#endif
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/* On Linux, session leader can acquire ctty
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* unknowingly, by opening a tty.
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* Prevent this: stop being a session leader.
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*/
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pid = xvfork();
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if (pid != 0)
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_exit(EXIT_SUCCESS); /* Parent */
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}
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if (opt & OPT_MAKEPID) {
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/* User wants _us_ to make the pidfile */
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@ -534,6 +555,7 @@ int start_stop_daemon_main(int argc UNUSED_PARAM, char **argv)
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}
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}
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#endif
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execvp(startas, argv);
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//bb_error_msg("HERE %d '%s'%s'", __LINE__, argv[0], argv[1]);
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execvp(argv[0], argv);
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bb_perror_msg_and_die("can't execute '%s'", startas);
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}
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@ -1201,11 +1201,11 @@ void set_task_comm(const char *comm) FAST_FUNC;
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* to /dev/null if they are not.
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*/
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enum {
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DAEMON_CHDIR_ROOT = 1,
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DAEMON_DEVNULL_STDIO = 2,
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DAEMON_CLOSE_EXTRA_FDS = 4,
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DAEMON_ONLY_SANITIZE = 8, /* internal use */
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DAEMON_DOUBLE_FORK = 16, /* double fork to avoid controlling tty */
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DAEMON_CHDIR_ROOT = 1 << 0,
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DAEMON_DEVNULL_STDIO = 1 << 1,
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DAEMON_CLOSE_EXTRA_FDS = 1 << 2,
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DAEMON_ONLY_SANITIZE = 1 << 3, /* internal use */
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//DAEMON_DOUBLE_FORK = 1 << 4, /* double fork to avoid controlling tty */
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};
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#if BB_MMU
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enum { re_execed = 0 };
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@ -292,14 +292,14 @@ void FAST_FUNC bb_daemonize_or_rexec(int flags, char **argv)
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dup2(fd, 0);
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dup2(fd, 1);
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dup2(fd, 2);
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if (flags & DAEMON_DOUBLE_FORK) {
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/* On Linux, session leader can acquire ctty
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* unknowingly, by opening a tty.
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* Prevent this: stop being a session leader.
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*/
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if (fork_or_rexec(argv))
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_exit(EXIT_SUCCESS); /* parent */
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}
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// if (flags & DAEMON_DOUBLE_FORK) {
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// /* On Linux, session leader can acquire ctty
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// * unknowingly, by opening a tty.
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// * Prevent this: stop being a session leader.
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// */
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// if (fork_or_rexec(argv))
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// _exit(EXIT_SUCCESS); /* parent */
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// }
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}
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while (fd > 2) {
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close(fd--);
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@ -16,4 +16,9 @@ testing "start-stop-daemon -a without -x" \
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"1\n" \
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"" ""
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testing "start-stop-daemon without -x and -a" \
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'start-stop-daemon -S false 2>&1; echo $?' \
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"1\n" \
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"" ""
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exit $FAILCOUNT
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