minor amendment to FAQ

[spider.git] / perl / Msg.pm

diff --git a/perl/Msg.pm b/perl/Msg.pm
index 403303dd05df5bafa77a2b8bb1e37c4d09e0587f..ec07d61da6878851f6b8f11f19aba403e5729cbd 100644 (file)
--- a/perl/Msg.pm
+++ b/perl/Msg.pm
@@ -15,8 +15,6 @@ use IO::Select;
 use IO::Socket;
 use DXDebug;
 use Timer;
-use Errno qw(EWOULDBLOCK EAGAIN EINPROGRESS);
-use POSIX qw(F_GETFL F_SETFL O_NONBLOCK);
 
 use vars qw(%rd_callbacks %wt_callbacks %er_callbacks $rd_handles $wt_handles $er_handles $now %conns $noconns);
 
@@ -33,9 +31,14 @@ my $blocking_supported = 0;
 BEGIN {
     # Checks if blocking is supported
     eval {
-        require POSIX; POSIX->import(qw (F_SETFL O_NONBLOCK));
+        require POSIX; POSIX->import(qw (F_SETFL F_GETFL O_NONBLOCK));
     };
     $blocking_supported = 1 unless $@;
+
+       # import as many of these errno values as are available
+       eval {
+               require Errno; Errno->import(qw(EAGAIN EINPROGRESS EWOULDBLOCK));
+       };
 }
 
 my $w = $^W;
@@ -280,6 +283,22 @@ sub _send {
     1;  # Success
 }
 
+sub dup_sock
+{
+       my $conn = shift;
+       my $oldsock = $conn->{sock};
+       my $rc = $rd_callbacks{$oldsock};
+       my $wc = $wt_callbacks{$oldsock};
+       my $ec = $er_callbacks{$oldsock};
+       my $sock = $oldsock->new_from_fd($oldsock, "w+");
+       if ($sock) {
+               set_event_handler($oldsock, read=>undef, write=>undef, error=>undef);
+               $conn->{sock} = $sock;
+               set_event_handler($sock, read=>$rc, write=>$wc, error=>$ec);
+               $oldsock->close;
+       }
+}
+
 sub _err_will_block {
        return 0 unless $blocking_supported;
        return ($_[0] == $eagain || $_[0] == $ewouldblock || $_[0] == $einprogress);