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package Select::Retry;
use strict;
use warnings;
use Sub::Exporter -setup => {
exports => [ 'retry_select' ],
groups => { default => [ 'retry_select' ] },
};
sub retry_select {
my ($mode, $timeout, @handles) = @_;
my $got_winch;
my $old_winch = $SIG{WINCH};
local $SIG{WINCH} = sub {
$got_winch = 1;
$old_winch->() if ref($old_winch) && ref($old_winch) eq 'CODE';
};
my ($out, $eout);
my ($in, $ein) = (_build_select_vec(@handles)) x 2;
my $res;
if ($mode eq 'r') {
$res = select($out = $in, undef, $eout = $ein, $timeout);
}
else {
$res = select(undef, $out = $in, $eout = $ein, $timeout);
}
my $again = $!{EAGAIN} || $!{EINTR};
if (($res == -1 && $again) || $got_winch) {
return retry_select(@_);
}
elsif ($res == -1) {
Carp::croak("select failed: $!");
}
return ($out, $eout);
}
sub _build_select_vec {
my @handles = @_;
my $vec = '';
for my $handle (@handles) {
vec($vec, fileno($handle), 1) = 1;
}
return $vec;
}
1;
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