Some daemons should not be killed when the system is shutting down. In
debian this is achieved by putting a file with the pid of the daemon in
it in /run/sendsigs.omit.d (or a symlink to its pidfile).
This patch lets mdmon automatically create a symlink in
/run/sendsigs.omit.d to its pidfile.
See also debian bug 684708 at
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=684708 ,
where I submitted a previous version of this patch.
Comments welcome.
Thanks,
Mike.
Index: mdadm-3.2.5/mdmon.c
===================================================================
--- mdadm-3.2.5.orig/mdmon.c 2012-08-13 09:46:43.205209547 +0000
+++ mdadm-3.2.5/mdmon.c 2012-08-24 09:44:45.472421616 +0000
@@ -142,6 +142,9 @@
static int make_pidfile(char *devname)
{
+#ifdef SENDSIGS_OMIT_DIR
+ char sendsigs_omit_path[100];
+#endif
char path[100];
char pid[10];
int fd;
@@ -160,6 +163,13 @@
close(fd);
if (n < 0)
return -errno;
+
+#ifdef SENDSIGS_OMIT_DIR
+ /* automatically symlink pidfile to sendsigs.omit.d/. ignore result. */
+ sprintf(sendsigs_omit_path, "%s/%s.pid", SENDSIGS_OMIT_DIR, devname);
+ symlink(path, sendsigs_omit_path);
+#endif
+
return 0;
}
@@ -211,6 +221,11 @@
unlink(buf);
sprintf(buf, "%s/%s.sock", MDMON_DIR, devname);
unlink(buf);
+#ifdef SENDSIGS_OMIT_DIR
+ sprintf(buf, "%s/%s.pid", SENDSIGS_OMIT_DIR, devname);
+ unlink(buf);
+#endif
+
}
static int make_control_sock(char *devname)
Index: mdadm-3.2.5/mdadm.h
===================================================================
--- mdadm-3.2.5.orig/mdadm.h 2012-05-18 07:10:03.000000000 +0000
+++ mdadm-3.2.5/mdadm.h 2012-08-24 09:41:53.205479556 +0000
@@ -102,6 +102,16 @@
#define FAILED_SLOTS_DIR "/run/mdadm/failed-slots"
#endif /* FAILED_SLOTS */
+/* Debian has a sendsigs.omit.d directory where pidfiles are located
+ * of daemons that should not be killed when shutting down. We symlink
+ * the mdmon pidfiles into this directory.
+ */
+#ifdef DEBIAN
+#ifndef SENDSIGS_OMIT_DIR
+#define SENDSIGS_OMIT_DIR "/run/sendsigs.omit.d"
+#endif
+#endif
+
#include "md_u.h"
#include "md_p.h"
#include "bitmap.h"
