try harder to prevent segfaulting on webkit init (mga#10289)

we segfault in SIG_CHLD when temporary webkit threads exit on init:
delay setting CHLD handler on forking the 1st tool

2 files changed, 8 insertions, 1 deletions

diff --git a/NEWS b/NEWS
index 7a02eeb6..68c3c303 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,6 @@
+- try harder to prevent segfaulting in SIG_CHLD when temporary webkit threads
+  exit on init: delay setting CHLD handler on forking the 1st tool (mga#10289)
+
 Version 12.46 - 21 December 2013 Thierry Vignaud
 
 - fix segfault when webkit creates threads for good (mga#10289)
diff --git a/control-center b/control-center
index 67139430..d2bfa2dd 100755
--- a/control-center
+++ b/control-center
@@ -705,7 +705,6 @@ $view->signal_connect('load-finished' => sub {
     state $done;
     return if $done;
     $done = 1;
-    $SIG{CHLD} = \&sig_child; 
     Glib::Timeout->add(100, sub { sig_child('CHLD', 1); 1 });
     load_program() if $program;
 });
@@ -1203,6 +1202,11 @@ my $pid_exp;
 
 sub fork_ {
     my ($prog, $o_pid_table) = @_;
+    state $done;
+    if (!$done) {
+       $done = 1;
+       $SIG{CHLD} = \&sig_child;
+    }
     $o_pid_table ||= \@pid_launched;
     my $pid = fork();
     if (defined $pid) {