From 7a431b3715299854fb423ec00d5fafc0e2c7f07b Mon Sep 17 00:00:00 2001
From: Denis Vlasenko <vda.linux@googlemail.com>
Date: Sun, 14 Jan 2007 01:29:06 +0000
Subject: By popular request reinstate fakeidentd's standalone mode. Since this
is also needed for other applets like telnetd, introduce generic driver for
such things. It even supports inetd-wait ('linger') mode, when inetd hands
out listen socket to child and waits to it to die, instead of handing out
accepted socket and continuing listening itself (nowait mode). Code growth
~200 bytes. NB: our inetd doesn't support wait mode yet (or mabe it is
buggy).
---
libbb/xfuncs.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
(limited to 'libbb')
diff --git a/libbb/xfuncs.c b/libbb/xfuncs.c
index 207537929..6a6bdced3 100644
--- a/libbb/xfuncs.c
+++ b/libbb/xfuncs.c
@@ -509,6 +509,30 @@ void xdaemon(int nochdir, int noclose)
}
#endif
+void bb_sanitize_stdio(int daemonize)
+{
+ int fd;
+ /* Mega-paranoid */
+ fd = xopen(bb_dev_null, O_RDWR);
+ while (fd < 2)
+ fd = dup(fd); /* have 0,1,2 open at least to /dev/null */
+ if (daemonize) {
+ pid_t pid = fork();
+ if (pid < 0) /* wtf? */
+ bb_perror_msg_and_die("fork");
+ if (pid) /* parent */
+ exit(0);
+ /* child */
+ setsid();
+ /* if daemonizing, make sure we detach from stdio */
+ dup2(fd, 0);
+ dup2(fd, 1);
+ dup2(fd, 2);
+ }
+ while (fd > 2)
+ close(fd--); /* close everything after fd#2 */
+}
+
// Die with an error message if we can't open a new socket.
int xsocket(int domain, int type, int protocol)
{
--
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