int make_console_stdio(void) {
int fd, r;
/* Make /dev/console the controlling terminal and stdin/stdout/stderr */
fd = acquire_terminal("/dev/console", false, true, true, USEC_INFINITY);
if (fd < 0)
return log_error_errno(fd, "Failed to acquire terminal: %m");
r = make_stdio(fd);
if (r < 0)
return log_error_errno(r, "Failed to duplicate terminal fd: %m");
return 0;
}
static int pivot_to_new_root(void) {
int fd;
chdir("/run/initramfs");
/*
In case some evil process made "/" MS_SHARED
It works for pivot_root, but the ref count for the root device
is not decreasing :-/
*/
if (mount(NULL, "/", NULL, MS_PRIVATE, NULL) < 0) {
log_error("Failed to make \"/\" private mount %m");
return -errno;
}
if (pivot_root(".", "oldroot") < 0) {
log_error("pivot failed: %m");
/* only chroot if pivot root succeded */
return -errno;
}
chroot(".");
log_info("Successfully changed into root pivot.");
fd = open("/dev/console", O_RDWR);
if (fd < 0)
log_error("Failed to open /dev/console: %m");
else {
make_stdio(fd);
/* Initialize the controlling terminal */
setsid();
ioctl(STDIN_FILENO, TIOCSCTTY, NULL);
}
return 0;
}
main()
{
#ifdef ALONE /* If no inetd */
int sockt, client, length;
struct sockaddr_in from;
extern int reaper();
disassoc();
/* fd 0-2 should be open and point to / now. */
#ifdef SYSLOG
#ifdef BSD_42
openlog("nntpd", LOG_PID); /* fd 3 */
#else
openlog("nntpd", LOG_PID, SYSLOG); /* fd 3 */
#endif
#endif
#ifdef FASTFORK
num_groups = read_groups(); /* Read active file now (fd 4) */
/* and then do it every */
set_timer(); /* so often later */
#endif
#ifndef EXCELAN
sockt = get_socket(); /* should be fd 4 or 5 */
#endif
#ifndef USG
(void) signal(SIGCHLD, reaper);
#endif
#ifndef EXCELAN
if (listen(sockt, SOMAXCONN) < 0) {
#ifdef SYSLOG
syslog(LOG_ERR, "main: listen: %m");
#endif
exit(1);
}
#endif
for (;;) {
#ifdef EXCELAN
int status;
sockt = get_socket();
if (sockt < 0)
continue;
client = accept(sockt, &from);
#else
length = sizeof (from);
client = accept(sockt, &from, &length);
#endif EXCELAN
if (client < 0) {
#ifdef SYSLOG
if (errno != EINTR)
syslog(LOG_ERR, "accept: %m\n");
#endif
#ifdef EXCELAN
close(sockt);
sleep(1);
#endif
continue;
}
switch (fork()) {
case -1:
#ifdef SYSLOG
syslog(LOG_ERR, "fork: %m\n");
#endif
#ifdef EXCELAN
(void) close(sockt);
#endif
(void) close(client);
break;
case 0:
#ifdef EXCELAN
if (fork())
exit(0);
bcopy(&from,¤t_peer,sizeof(from));
make_stdio(sockt);
#else
(void) close(sockt);
make_stdio(client);
#endif
serve();
break;
default:
#ifdef EXCELAN
(void) close(sockt);
(void) wait(&status);
#else
(void) close(client);
#endif
break;
}
}
#else /* We have inetd */
serve();
#endif
}