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lsyncd
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replace daemon(0, 0) with own daemonize

This commit is contained in:
Axel Kittenberger 2010-11-29 22:34:58 +00:00
parent aee59ea5c7
commit e22691e111
1 changed files with 59 additions and 6 deletions
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65
lsyncd.c
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@ -483,9 +483,9 @@ write_pidfile(lua_State *L, const char *pidfile) {
*
****************************************************************************/
static void daemonize(lua_State *L);
static int l_stackdump(lua_State* L);
/**
* Logs a message.
*
@ -888,11 +888,7 @@ l_configure(lua_State *L)
settings.log_syslog = true;
}
logstring("Debug", "daemonizing now.");
if (daemon(0, 0)) {
logstring("Error", "Failed to daemonize");
exit(-1); //ERRNO
}
is_daemon = true;
daemonize(L);
}
} else if (!strcmp(command, "nodaemon")) {
settings.nodaemon = true;
@ -1216,6 +1212,63 @@ nonobserve_fd(int fd)
observances_len--;
}
/**
* Daemonizes.
*
* Lsyncds own implementation over daemon(0, 0) since
* a) OSX keeps bugging about it being deprecated
* b) for reason since blindly closing stdin/out/err is unsafe, since
* they might not have existed and actually close the monitors fd!
*/
static void
daemonize(lua_State *L)
{
pid_t pid, sid;
pid = fork();
if (pid < 0) {
printlogf(L, "Error",
"Failure in daemonize at fork: %s", strerror(errno));
exit(-1); // ERRNO
}
if (pid > 0) {
/* return parent to shell */
exit(0);
}
sid = setsid();
if (sid < 0) {
printlogf(L, "Error",
"Failure in daemonize at setsid: %s", strerror(errno));
exit(-1); // ERRNO
}
/* goto root dir */
if ((chdir("/")) < 0) {
printlogf(L, "Error",
"Failure in daemonize at chdir(\"/\"): %s", strerror(errno));
exit(-1); // ERRNO
}
/* does what clibs daemon(0, 0) cannot do,
* checks if there were no stdstreams and it might close used fds! */
if (observances_len && observances->fd < 3) {
printlogf(L, "Normal",
"daemonize not closing stdin/out/err, since there seem to none.");
return;
}
/* disconnects stdstreams */
if (!freopen("/dev/null", "r", stdin) ||
!freopen("/dev/null", "r", stdout) ||
!freopen("/dev/null", "r", stderr)
) {
printlogf(L, "Error",
"Failure in daemonize at freopen(/dev/null, std[in|out|err])");
}
is_daemon = true;
}
/**
* Normal operation happens in here.
*/