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-rw-r--r--shell.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/shell.c b/shell.c
index 6a48de05ff..ad60200d28 100644
--- 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