[poky] V2 [PATCH 2/3] Add pidofproc to ${sysconfdir}/init.d/functions

[Robert Yang]

Add pidofproc to ${sysconfdir}/init.d/functions, this is used for
getting the pid of the process. It uses pidof to implement currently, it
may also use the pidfile or ps to implement in the future.

Signed-off-by: Robert Yang <liezhi.yang at windriver.com>
---
 .../initscripts/initscripts-1.0/functions          |   32 ++++++++++++++++++-
 1 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/meta/recipes-core/initscripts/initscripts-1.0/functions b/meta/recipes-core/initscripts/initscripts-1.0/functions
index 689fd32..6a51b3b 100644
--- a/meta/recipes-core/initscripts/initscripts-1.0/functions
+++ b/meta/recipes-core/initscripts/initscripts-1.0/functions
@@ -4,11 +4,39 @@
 #               shell scripts in the /etc/init.d directory.
 #
 
+# NOTE: The pidofproc () doesn't support the process which is a script unless
+#       the pidof supports "-x" option. If you want to use it for such a
+#       process:
+#       1) If there is no "pidof -x", replace the "pidof $1" with another
+#          command like(for core-image-minimal):
+#            ps | awk '/'"$1"'/ {print $1}'
+#       Or
+#       2) If there is "pidof -x", replace "pidof" with "pidof -x".
+pidofproc () {
+        local pid status
+
+        status=0
+        # pidof output null when no program is running, so no "2>/dev/null".
+        pid=`pidof $1` || status=$?
+        case $status in
+          0)
+                echo $pid
+                return 0
+                ;;
+          127)
+                echo "ERROR: command pidof not found" >&2
+                exit 127
+                ;;
+          *)
+                return $status
+                ;;
+        esac
+}
+
 machine_id() {		# return the machine ID
     awk 'BEGIN { FS=": " } /Hardware/ { gsub(" ", "_", $2); print tolower($2) } ' </proc/cpuinfo
 }
 
 killproc() {		# kill the named process(es)
-    pid=`/bin/pidof $1`
-    [ "$pid" != "" ] && kill $pid
+    pid=`pidofproc $1` && kill $pid
 }
-- 
1.7.1