From 12bfd5699dc69fdaf79ab1af59d2d69336ae9248 Mon Sep 17 00:00:00 2001
From: xuweibj <xwbj@cn.ibm.com>
Date: Fri, 1 Jun 2018 14:30:53 +0800
Subject: [PATCH] if not get valid pid when waitpid, sleep (#5274)

---
 xCAT-server/lib/xcat/plugins/openbmc.pm | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/xCAT-server/lib/xcat/plugins/openbmc.pm b/xCAT-server/lib/xcat/plugins/openbmc.pm
index 7841afcde..1a20bf10f 100644
--- a/xCAT-server/lib/xcat/plugins/openbmc.pm
+++ b/xCAT-server/lib/xcat/plugins/openbmc.pm
@@ -1088,8 +1088,10 @@ rmdir \"/tmp/\$userid\" \n";
         }
 
         if (%child_node_map) {
+            my $pid_flag = 0;
             while ((my $cpid = waitpid(-1, WNOHANG)) > 0) {
                 if ($child_node_map{$cpid}) {
+                    $pid_flag = 1;
                     my $node = $child_node_map{$cpid};
                     my $rc = $? >> 8;
                     if ($rc != 0) {
@@ -1107,6 +1109,9 @@ rmdir \"/tmp/\$userid\" \n";
                     delete $child_node_map{$cpid};
                 }
             }
+            unless ($pid_flag) {
+                select(undef, undef, undef, 0.01);
+            }
         }
         my @del;
         while (my ($k, $v) = each %node_wait) {