1 files changed, 24 insertions, 0 deletions

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)
 {