From a711fc132a7e18e67def6abeba3f8d18bbaae72f Mon Sep 17 00:00:00 2001
From: minima <minima>
Date: Sat, 17 Mar 2001 13:25:39 +0000
Subject: [PATCH] put POSIX block check back in, try to deal with M$ lack of
 EWOULDBLOCK and EINPROGRESS

---
 Changes           |  3 +++
 perl/DXProtout.pm |  2 +-
 perl/Msg.pm       | 25 +++++++++++++++++++++----
 3 files changed, 25 insertions(+), 5 deletions(-)

diff --git a/Changes b/Changes
index 2ccd8b4e..4b38e955 100644
--- a/Changes
+++ b/Changes
@@ -1,3 +1,6 @@
+17Mar01=======================================================================
+1. put block check back in, try a work around for EWOULDBLOCK/EINPROGRESS
+for M$. 
 16Mar01=======================================================================
 1. integrate build number into main cluster and change the PC18 to show 
 version and build in the text portion
diff --git a/perl/DXProtout.pm b/perl/DXProtout.pm
index 86ab0e86..6ee4fbcc 100644
--- a/perl/DXProtout.pm
+++ b/perl/DXProtout.pm
@@ -102,7 +102,7 @@ sub pc17
 # Request init string
 sub pc18
 {
-	return "PC18^DXSpider Version $main::version Build $main::build^$DXProt::myprot_version^";
+	return "PC18^DXSpider Version: $main::version Build: $main::build^$DXProt::myprot_version^";
 }
 
 #
diff --git a/perl/Msg.pm b/perl/Msg.pm
index 839b5e45..b7be27d3 100644
--- a/perl/Msg.pm
+++ b/perl/Msg.pm
@@ -28,6 +28,22 @@ $wt_handles   = IO::Select->new();
 $er_handles   = IO::Select->new();
 
 $now = time;
+my $blocking_supported = 0;
+
+BEGIN {
+    # Checks if blocking is supported
+    eval {
+        require POSIX; POSIX->import(qw (F_SETFL O_NONBLOCK));
+    };
+    $blocking_supported = 1 unless $@;
+}
+
+my $w = $^W;
+$^W = 0;
+my $eagain = eval {EAGAIN()};
+my $einprogress = eval {EINPROGRESS()};
+my $ewouldblock = eval {EWOULDBLOCK()};
+$^W = $w;
 
 #
 #-----------------------------------------------------------------
@@ -71,6 +87,8 @@ sub set_rproc
 
 sub blocking
 {
+	return unless $blocking_supported;
+	
 	my $flags = fcntl ($_[0], F_GETFL, 0);
 	if ($_[1]) {
 		$flags &= ~O_NONBLOCK;
@@ -137,9 +155,7 @@ sub connect {
 	my $ip = gethostbyname($to_host);
 #	my $r = $sock->connect($to_port, $ip);
 	my $r = connect($sock, pack_sockaddr_in($to_port, $ip));
-	unless ($r) {
-		return undef unless $! == EINPROGRESS;
-	}
+	return undef unless $r || _err_will_block($r);
 	
 	$conn->{sock} = $sock;
     
@@ -265,7 +281,8 @@ sub _send {
 }
 
 sub _err_will_block {
-	return ($_[0] == EAGAIN || $_[0] == EWOULDBLOCK || $_[0] == EINPROGRESS);
+	return 0 unless $blocking_supported;
+	return ($_[0] == $eagain || $_[0] == $ewouldblock || $_[0] == $einprogress);
 }
 
 sub close_on_empty
-- 
2.43.0