$SIG{INT} = $SIG{QUIT} = $SIG{TERM} = sub { die "received interrupt\n"; };
$SIG{CHLD} = $SIG{PIPE} = 'DEFAULT';
-
- # set sess/process group - we want to be able to kill the
- # whole process group
- POSIX::setsid();
+ $SIG{TTOU} = 'IGNORE';
+
+ # set session/process group allows to kill the process group
+ if ($sync && -t STDIN) {
+ # some sync'ed workers operate on the tty but setsid sessions lose
+ # the tty, so just create a new pgroup and give it the tty
+ POSIX::setpgid(0, 0) or die "failed to setpgid: $!\n";
+ POSIX::tcsetpgrp(fileno(STDIN), $$) or die "failed to tcsetpgrp: $!\n";
+ } else {
+ POSIX::setsid();
+ }
POSIX::close ($psync[0]);
POSIX::close ($ctrlfd[0]) if $sync;