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Non-blocking TCP connections

by twerq (Deacon)
on Mar 22, 2001 at 00:39 UTC ( [id://66135]=CUFP: print w/replies, xml ) Need Help??

Many people have posted asking for help with a non-blocking IO::Socket::INET connection, specifically as a tcp client. As far as I could see, there was no way. . . hence this small hack. Simply use IO::Socket::INET_NONBLOCK and your sockets will be returned (true) every time, almost immediately. Which can be very useful in conjunction with IO::Select, when you have to do many connections and don't want to wait on them. . . mail me here with any success or failure reports. .
# # # Copyright (c) 2001 Derek Watson <>. # # Cheap Hack(tm) agains Graham Barr's IO::Socket::INET # to allow non-blocking client Socket connections # package IO::Socket::INET_NONBLOCK; use strict; our(@ISA, $VERSION); use IO::Socket::INET; use Carp; @ISA = qw(IO::Socket::INET); sub connect { # this is a redifined IO::Socket::INET->connect @_ == 2 || @_ == 3 or croak 'usage: $sock->connect(NAME) or $sock->connect(PORT, ADD +R)'; # grab our socket my $sock = shift; # set to non-blocking $sock->blocking(0); # pack the host address my $addr = @_ == 1 ? shift : pack_sockaddr_in(@_); # pass directly to perl's connect() function, # bypassing the call to IO::Socket->connect # which usually handles timeouts, blocking # and error handling. connect($sock, $addr); # lets just go ahead and assume it worked. . . return 1; } 1;

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