1 files changed, 12 insertions, 0 deletions
diff --git a/setup.c b/setup.c
index 1b120175f2..12a85d1613 100644
--- a/setup.c
+++ b/setup.c
@@ -872,3 +872,15 @@ const char *resolve_gitdir(const char *suspect)
 		return suspect;
 	return read_gitfile(suspect);
 }
+
+/* if any standard file descriptor is missing open it to /dev/null */
+void sanitize_stdfds(void)
+{
+	int fd = open("/dev/null", O_RDWR, 0);
+	while (fd != -1 && fd < 2)
+		fd = dup(fd);
+	if (fd == -1)
+		die_errno("open /dev/null or dup failed");
+	if (fd > 2)
+		close(fd);
+}