added get_pid() and ck_pidfile() (FS#18654)

Implemented suggestions of Dave.

get_pid:
  Arguments: programname
  Returns:   PID of program
ck_pidfile:
  Arguments: PID-file programname
  Returns:   0 - PID in PID-file is of program
             1 - PID in PID-file is not of program

Signed-off-by: Andrwe Lord Weber <archlinux@andrwe.org>
Signed-off-by: Tom Gundersen <teg@jklm.no>

1 files changed, 15 insertions, 0 deletions

diff --git a/functions b/functions
index f4435b1..3e92fb0 100644
--- a/functions
+++ b/functions
@@ -235,6 +235,21 @@ ck_status() {
 	fi
 }
 
+# Return PID of $1
+get_pid() {
+        pidof -o %PPID $1 || return 1
+}
+
+# Check if PID-file $1 is still the active PID-file for command $2
+ck_pidfile() {
+        if [[ -f "$1" ]]; then
+                read -r fpid <"$1"
+                ppid=$(get_pid $2)
+                [[ "$fpid" = "$ppid" ]] && return 0
+        fi
+        return 1
+}
+
 # PIDs to be omitted by killall5
 declare -a omit_pids