make git-shell paranoid about closed stdin/stdout/stderr

diff --git a/shell.c b/shell.c
index 6a48de05ff80f86050715ef3dab87a48b0a86ac9..ad60200d28e9957f54a34435f5dc59fce412666c 100644 (file)
--- a/shell.c
+++ b/shell.c
@@ -56,6 +56,19 @@ 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