+#!perl -T
+
+use Test::More tests => 10;
+
+use POSIX qw/SIGINT SIGTERM SIGKILL SIGHUP EXIT_SUCCESS EXIT_FAILURE/;
+
+use IPC::MorseSignals qw/msend mrecv mreset/;
+
+my $lives = 10;
+
+sub spawn {
+ --$lives;
+ die 'forked too many times' if $lives < 0;
+ pipe my $rdr, my $wtr or die "pipe() failed: $!";
+ my $pid = fork;
+ if (!defined $pid) {
+ die "fork() failed: $!";
+ } elsif ($pid == 0) {
+ close $rdr or die "close() failed: $!";
+ my $block = 0;
+ my $s = mrecv local %SIG, cb => sub {
+ if ($block) {
+ $block = 0;
+ } else {
+ select $wtr; $| = 1;
+ print $wtr $_[1], "\n";
+ select $wtr; $| = 1;
+ }
+ };
+ $SIG{HUP} = sub { mreset $s };
+ $SIG{__WARN__} = sub { $block = 1; };
+ 1 while 1;
+ exit EXIT_FAILURE;
+ }
+ close $wtr or die "close() failed: $!";
+ return ($pid, $rdr);
+}
+
+sub slaughter {
+ my ($pid) = @_;
+ kill SIGINT => $pid;
+ kill SIGTERM => $pid;
+ kill SIGKILL => $pid;
+ waitpid $pid, 0;
+}
+
+my @res;
+
+my ($pid, $rdr) = spawn;
+
+sub tryspeed {
+ my ($l, $n) = @_;
+ my $speed = 2 ** 16;
+ my $ok = 0;
+ my @alpha = ('a' .. 'z');
+ my $msg = join '', map { $alpha[rand @alpha] } 1 .. $l;
+ my $desc_base = "$l bytes sent $n times";
+ while (($ok < $n) && (($speed /= 2) >= 1)) {
+ my $desc = "$desc_base at $speed bits/s";
+ diag("try $desc...");
+TRY:
+ for (1 .. $n) {
+ my $r = '';
+ eval {
+ local $SIG{ALRM} = sub { die 'timeout' };
+ local $SIG{__WARN__} = sub { die 'do not want warnings' };
+ my $a = (int(100 * (3 * $l) / $speed) || 1);
+ $a = 10 if $a > 10;
+ alarm $a;
+ kill SIGHUP => $pid;
+ msend $msg => $pid, speed => $speed;
+ $r = <$rdr>;
+ };
+ kill SIGHUP => $pid if $@;
+ alarm 0;
+ if (!defined $r) { # Something bad happened, respawn
+ close $rdr or die "close() failed: $!";
+ slaughter $pid;
+ ($pid, $rdr) = spawn;
+ redo TRY; # Retry this send
+ } else {
+ chomp $r;
+ if ($r eq $msg) {
+ ++$ok;
+ } else {
+ kill SIGHUP => $pid;
+ last TRY;
+ }
+ }
+ }
+ }
+ ok($ok >= $n, $desc_base);
+ push @res, $desc_base . (($speed) ? ' at ' . $speed . ' bits/s' : ' failed');
+}
+
+tryspeed 4, 1;
+tryspeed 4, 4;
+tryspeed 4, 16;
+tryspeed 4, 64;
+tryspeed 16, 1;
+tryspeed 16, 4;
+tryspeed 16, 16;
+tryspeed 64, 1;
+tryspeed 64, 4;
+tryspeed 256, 1;
+
+slaughter $pid;
+
+diag '=== Summary ===';
+diag $_ for sort {
+ my ($l1, $n1) = $a =~ /(\d+)\D+(\d+)/;
+ my ($l2, $n2) = $b =~ /(\d+)\D+(\d+)/;
+ $l1 <=> $l2 || $n1 <=> $n2
+} @res;