Use select. Example in the while loop below:
#!/usr/local/bin/perl -w
use strict;
BEGIN {
# from Camel book 2nd ed. p.474
use POSIX qw(:termios_h);
my ($term, $oterm, $echo, $noecho, $fd_stdin);
$fd_stdin = fileno(STDIN);
$term = POSIX::Termios->new();
$term->getattr($fd_stdin);
$oterm = $term->getlflag();
$echo = ECHO | ECHOK | ICANON;
$noecho = $oterm & ~$echo;
sub cbreak {
$term->setlflag($noecho);
$term->setcc(VTIME, 1);
$term->setattr($fd_stdin, TCSANOW);
}
sub cooked {
$term->setlflag($oterm);
$term->setcc(VTIME, 0);
$term->setattr($fd_stdin, TCSANOW);
}
}
END {
cooked();
}
cbreak();
while (1) {
my ($rin, $rout, $nfound);
$rin = '';
vec($rin, fileno(STDIN), 1) = 1;
if ($nfound = select($rout=$rin, undef, undef, 0.001)) {
my ($key);
sysread(STDIN, $key, 1);
if ($key eq 'j') {
print "It was j!\n";
} elsif ($key eq 'q') {
print "I'm melting!\n";
exit;
}
}
}
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