mdmon: recreate socket/pid file on SIGHUP

Allow mdmon to start while /var/run/mdadm is readonly.  Later a SIGHUP
can trigger mdmon to drop its pid and socket once /var/run/mdadm is
writable.  Of course one needs the pid to send a HUP, that can be stored
in a distribution specific rw-init directory... For now, rely on a
killall -HUP mdmon to get the files dumped.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/mdmon.h b/mdmon.h
index b3f4d6e7..e5b2a727 100644
--- a/mdmon.h
+++ b/mdmon.h
@@ -55,6 +55,9 @@ extern struct md_generic_cmd *active_cmd;
 void remove_pidfile(char *devname);
 void do_monitor(struct supertype *container);
 void do_manager(struct supertype *container);
+int make_control_sock(char *devname);
+int make_pidfile(char *devname, int o_excl);
+extern int socket_hup_requested;
 
 int read_dev_state(int fd);
 int get_resync_start(struct active_array *a);