Perl
Chilkat2 Perl
Check Whether a Socket Is Writable
See more Socket/SSL/TLS Examples
Demonstrates Socket.CheckWriteable, which waits for the connected socket to become writable. It returns 1 if writable, 0 if it did not become writable before the timeout, or -1 on error.
Background. A maxWaitMs of 0 performs a nonblocking poll. This is useful for flow control before attempting a large send.
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use strict;
use warnings;
use Chilkat2;
my $socket = Chilkat2::Socket->new;
# Connect to the server using TLS.
my $bTls = 1;
my $maxWaitMs = 5000;
my $success = $socket->Connect('example.com', 5000, $bTls, $maxWaitMs);
if (!$success) {
print $socket->LastErrorText, "\n";
exit;
}
# Wait up to 5 seconds for the socket to become writable. Returns 1 if writable, 0 if it did not
# become writable before the timeout, or -1 on error.
my $writable = $socket->CheckWriteable(5000);
if ($writable < 0) {
print $socket->LastErrorText, "\n";
exit;
}
if ($writable != 1) {
print "The socket did not become writable before the timeout.\n";
exit;
}
print "The socket is writable.\n";