ctdb-tests: Add "ctdb process-exists" tool test

Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>

ctdb/tests/tool/ctdb.process-exists.001.sh

@@ -0,0 +1,22 @@
+#!/bin/sh
+
+. "${TEST_SCRIPTS_DIR}/unit.sh"
+
+define_test "ctdbd process on node 0"
+
+setup_ctdbd <<EOF
+NODEMAP
+0       192.168.20.41   0x0     CURRENT RECMASTER
+1       192.168.20.42   0x0
+2       192.168.20.43   0x0
+EOF
+
+pid=$(ctdbd_getpid)
+
+ok "PID $pid exists"
+simple_test "$pid"
+
+# Use a PID that is probably impossible.  It must fit into 32 bits but
+# should be larger than most settings for pid_max.
+required_result 1 "PID 99999999 does not exist"
+simple_test "99999999"