use Forks::Super ':test';
use Test::More tests => 2;
use strict;
use warnings;
# XXX - something in this test can generate SIGPIPE and cause
# test to fail with NZEC
sub _read_socket {
my $handle = shift;
return $Forks::Super::Job::Ipc::USE_TIE_SH
? <$handle>
: Forks::Super::Job::Ipc::_read_socket($handle, undef, 0);
}
#
# test whether a parent process can have access to the
# STDIN, STDOUT, and STDERR filehandles of a child
# process. This features allows for communication
# between parent and child processes.
#
##################################################
#
# a proof-of-concept: pass strings to a child
# and receive back the checksums
#
sub compute_checksums_in_child {
binmode STDOUT;
my $count = 0;
for (;;) {
$_ = _read_socket(*STDIN);
if (!defined($_) || $_ eq '') {
if ($^O eq 'MSWin32') {
Forks::Super::pause(1.0E-2);
} else {
Forks::Super::pause(1.0E-3);
}
next;
}
s/\s+$//;
last if $_ eq "__END__";
print "$_\\", unpack("%32C*",$_)%65535,"\n";
}
}
my @pids = ();
for (my $i=0; $i<4; $i++) {
# v0.33: list context may be supported
push (@pids,
scalar fork {
sub => \&compute_checksums_in_child,
timeout => 30,
child_fh => "in,out,socket"
});
}
# there is a SIGPIPE somewhere here that causes intermittent failures
# (see www.cpantesters.org/cpan/report/b2d2eb00-6ec0-11e0-ab3a-49fa30e3b300)
# include some diag() statements to help track it down ...
my @data = (@INC,%INC,keys(%!),keys(%ENV),0..99)[0 .. 99];
my (@pdata, @cdata);
# SIGPIPE indicates that the child process has died, and that
# the remainder of this test will not go well.
my $sigpipes_caught = 0;
my $active_pid;
$SIG{PIPE} = sub {
if (++$sigpipes_caught =~ /[1-9](0|$)/) {
diag("SIGPIPE caught, pid $active_pid: $sigpipes_caught");
}
if ($active_pid) {
$active_pid->close_fh('stdin');
}
};
for (my $i=0; $i<@data; $i++) {
$active_pid = $pids[$i % 4];
my $zzz = $active_pid->write_stdin("$data[$i]\n");
push @pdata, sprintf("%s\\%d\n",
$data[$i], unpack("%32C*",$data[$i])%65535);
}
for my $pid (@pids) {
$active_pid = $pid;
Forks::Super::write_stdin($pid, "__END__\r\n");
Forks::Super::write_stdin($pid, "__END__\r\n");
$pid->close_fh('stdin');
}
waitall;
foreach (@pids) {
push @cdata, Forks::Super::read_stdout($_);
}
ok(@pdata > 0 && @cdata >= @pdata, ### 1 ###
"$$\\parent & child processed " .(scalar @pdata)
."/".(scalar @cdata)." strings");
@pdata = sort @pdata;
@cdata = sort @cdata;
my $pc_equal = 1;
for (my $i=0; $i<@cdata; $i++) {
no warnings 'uninitialized';
if ($pdata[$i] ne $cdata[$i]) {
$pc_equal = 0;
}
}
ok($pc_equal, "parent/child agree on output");
#######################################################################
#