From: Bill Erickson <berick@esilibrary.com>
Date: Fri, 28 Oct 2011 15:33:24 +0000 (-0400)
Subject: Add SIGPIPE retry handling to child data sysread
X-Git-Url: https://old-git.evergreen-ils.org/?a=commitdiff_plain;h=a7be31f137ccf6e2f4522c9a4c690a23b5636db8;p=working%2FOpenSRF.git

Add SIGPIPE retry handling to child data sysread

Similar to the SIGPIPE retry logic wrapped around the parent process'
syswrite call (for sending data to a child process), protect the child's
sysread call (as it reads data from the parent).  In pre-2.0, the
sysread step was handled by Net::Server, but now we need to protect it
ourselves.

Signed-off-by: Bill Erickson <berick@esilibrary.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>
---

diff --git a/src/perl/lib/OpenSRF/Server.pm b/src/perl/lib/OpenSRF/Server.pm
index 28980d3..9e7ffa8 100644
--- a/src/perl/lib/OpenSRF/Server.pm
+++ b/src/perl/lib/OpenSRF/Server.pm
@@ -589,10 +589,20 @@ sub wait_for_request {
     while(1) {
         # Start out blocking, when data is available, read it all
 
+        my $sig_pipe = 0;
+        local $SIG{'PIPE'} = sub { $sig_pipe = 1 };
+
         my $buf = '';
         my $n = sysread($self->{pipe_to_parent}, $buf, $read_size);
 
         unless(defined $n) {
+
+            if ($sig_pipe) {
+                $logger->info("server: $self got SIGPIPE reading data from parent, retrying...");
+                usleep(50000); # 50 msec
+                next;
+            }
+
             $logger->error("server: error reading data pipe: $!") unless EAGAIN == $!; 
             last;
         }