X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;f=shell.c;h=e3393690dd3b79af80e6b95710583e744fd574d4;hb=fd631d5828ec6b89e86e0568e5e798787fed9bbd;hp=0f6a727a8c267cdeb3a93c30bc688bb64ecd8003;hpb=a1184d85e8752658f02746982822f43f32316803;p=git.git

diff --git a/shell.c b/shell.c
index 0f6a727a8..e3393690d 100644
--- a/shell.c
+++ b/shell.c
@@ -48,6 +48,19 @@ int main(int argc, char **argv)
 {
 	char *prog;
 	struct commands *cmd;
+	int devnull_fd;
+
+	/*
+	 * Always open file descriptors 0/1/2 to avoid clobbering files
+	 * in die().  It also avoids not messing up when the pipes are
+	 * dup'ed onto stdin/stdout/stderr in the child processes we spawn.
+	 */
+	devnull_fd = open("/dev/null", O_RDWR);
+	while (devnull_fd >= 0 && devnull_fd <= 2)
+		devnull_fd = dup(devnull_fd);
+	if (devnull_fd == -1)
+		die("opening /dev/null failed (%s)", strerror(errno));
+	close (devnull_fd);
 
 	/*
 	 * Special hack to pretend to be a CVS server