/**
* Become a daemon, discarding the controlling terminal.
*
* Borrowed from rsync.
*
* This function returns in the child, but not in the parent.
**/
static void dcc_detach(void)
{
int i;
pid_t pid;
pid_t sid;
dcc_ignore_sighup();
if ((pid = fork()) == -1) {
rs_log_error("fork failed: %s", strerror(errno));
exit(EXIT_DISTCC_FAILED);
} else if (pid != 0) {
/* In the parent. This guy is about to go away so as to
* detach from the controlling process, but first save the
* child's pid. */
dcc_save_pid(pid);
_exit(0);
}
/* This is called in the detached child */
/* detach from the terminal */
#ifdef HAVE_SETSID
if ((sid = setsid()) == -1) {
rs_log_error("setsid failed: %s", strerror(errno));
} else {
rs_trace("setsid to session %d", (int) sid);
}
#else /* no HAVE_SETSID */
#ifdef TIOCNOTTY
i = open("/dev/tty", O_RDWR);
if (i >= 0) {
ioctl(i, (int) TIOCNOTTY, (char *)0);
close(i);
}
#endif /* TIOCNOTTY */
#endif /* not HAVE_SETSID */
/* make sure that stdin, stdout an stderr don't stuff things
up (library functions, for example) */
for (i=0;i<3;i++) {
close(i);
open("/dev/null", O_RDWR);
}
/* If there's a lifetime limit on this server (for testing) then it needs
* to apply after detaching as well. */
dcc_set_lifetime();
}
/**
* distcc daemon. May run from inetd, or standalone. Accepts
* requests from clients to compile files.
**/
int main(int argc, char *argv[])
{
int ret;
const char *tmp;
dcc_setup_startup_log();
if (distccd_parse_options(argc, (const char **) argv))
dcc_exit(EXIT_DISTCC_FAILED);
/* check this before redirecting the logs, so that it's really obvious */
if (!dcc_should_be_inetd())
if (opt_allowed == NULL) {
rs_log_error("--allow option is now mandatory; "
"you must specify which clients are allowed to connect");
ret = EXIT_BAD_ARGUMENTS;
goto out;
}
if ((ret = dcc_set_lifetime()) != 0)
dcc_exit(ret);
/* do this before giving away root */
if (nice(opt_niceness) == -1) {
rs_log_warning("nice %d failed: %s", opt_niceness,
strerror(errno));
/* continue anyhow */
}
if ((ret = dcc_discard_root()) != 0)
dcc_exit(ret);
/* Discard privileges before opening log so that if it's created, it has
* the right ownership. */
dcc_setup_real_log();
/* Do everything from root directory. Allows start directory to be
* unmounted, should make accidental writing of local files cause a
* failure... */
if ((ret = dcc_get_tmp_top(&tmp)))
goto out;
if (chdir(tmp) == -1) {
rs_log_error("failed to chdir to %s: %s", tmp, strerror(errno));
ret = EXIT_IO_ERROR;
goto out;
} else {
rs_trace("chdir to %s", tmp);
}
if ((ret = dcc_setup_daemon_path()))
goto out;
if (dcc_should_be_inetd())
ret = dcc_inetd_server();
else
ret = dcc_standalone_server();
out:
dcc_exit(ret);
}
