# HG changeset patch
# User Florian Haas <[email protected]>
# Date 1292402996 -3600
# Node ID 8459a4918ad86c93962b8b59dd14d380c1e48eed
# Parent 2b64174a3b9c8404391d5de27b800edb25c1833a
Medium: .ocf-shellfuncs: add ocf_test_pid convenience function
Add an OCF-style function, ocf_test_pid(), to test for a running
process by PID. This function employs the following logic:
* Send the process a 0 signal.
- If sending the signal succeeds:
* Check whether /proc/$pid/status exists.
- If it does:
* Test whether the process status is Z (zombie, defunct).
- If it is, return $OCF_ERR_GENERIC.
- If it is not, return $OCF_SUCCESS.
- If it does not (as on any non-Linux platform if I'm not
mistaken), then just assume that the process is running, and
return $OCF_SUCCESS.
- If sending the signal succeeds:
* The process can be safely assumed to not exist. Return
$OCF_NOT_RUNNING.
The name is deliberately ocf_test_pid not ocf_check_pid, to not create
the false impression that this has anything to do with
OCF_CHECK_LEVEL.
diff -r 2b64174a3b9c -r 8459a4918ad8 heartbeat/.ocf-shellfuncs.in
--- a/heartbeat/.ocf-shellfuncs.in Tue Dec 14 15:22:39 2010 +0100
+++ b/heartbeat/.ocf-shellfuncs.in Wed Dec 15 09:49:56 2010 +0100
@@ -117,6 +117,42 @@
esac
}
+# ocf_test_pid: test for the status of a process identified by ID, and
+# return an OCF compliant status code.
+#
+# Given a process ID, try to send it a 0 signal. If that returns an
+# error, we know that that PID is not in the process table, and the
+# process is certainly not running. If kill does return successfully,
+# then the process may still be a zombie, so test for that too. That
+# test, however, is Linux specific -- so on platforms where
+# /proc/$pid/status does not exist, just be happy with what kill says.
+ocf_test_pid() {
+ local rc
+ local pid
+
+ rc=$OCF_SUCCESS
+ pid=$1
+
+ if kill -s 0 $pid 2>/dev/null; then
+ # Process exists in process table, check its status
+ # (Linux only)
+ if [ -r /proc/$pid/status ]; then
+ if grep -E "State:[[:space:]]+Z \(zombie\)"
/proc/$pid/status; then
+ ocf_log err "Process $pid is defunct"
+ rc=$OCF_ERR_GENERIC
+ fi
+ fi
+ else
+ ocf_log debug "Process $pid is dead"
+ rc=$OCF_NOT_RUNNING
+ fi
+
+ if [ $rc -eq $OCF_SUCCESS ]; then
+ ocf_log debug "Process $pid is currently running"
+ fi
+ return $rc
+}
+
__ocf_set_defaults() {
__OCF_ACTION="$1"
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