+sub wait_for_tail () { sleep(2) }
+
+sub start_script {
+ my ($cmd, $env, $opt) = @_;
+ my ($key, @argv) = @$cmd;
+ my $run_mode = $ENV{TEST_RUN_MODE} // $opt->{run_mode} // 1;
+ my $sub = $run_mode == 0 ? undef : key2sub($key);
+ my $tail_pid;
+ if (my $tail_cmd = $ENV{TAIL}) {
+ my @paths;
+ for (@argv) {
+ next unless /\A--std(?:err|out)=(.+)\z/;
+ push @paths, $1;
+ }
+ if (@paths) {
+ defined($tail_pid = fork) or die "fork: $!\n";
+ if ($tail_pid == 0) {
+ # make sure files exist, first
+ open my $fh, '>>', $_ for @paths;
+ open(STDOUT, '>&STDERR') or die "1>&2: $!";
+ exec(split(' ', $tail_cmd), @paths);
+ die "$tail_cmd failed: $!";
+ }
+ wait_for_tail();
+ }
+ }
+ defined(my $pid = fork) or die "fork: $!\n";
+ if ($pid == 0) {
+ # pretend to be systemd (cf. sd_listen_fds(3))
+ # 3 == SD_LISTEN_FDS_START
+ my $fd;
+ for ($fd = 0; 1; $fd++) {
+ my $s = $opt->{$fd};
+ last if $fd >= 3 && !defined($s);
+ next unless $s;
+ my $fl = fcntl($s, F_GETFD, 0);
+ if (($fl & FD_CLOEXEC) != FD_CLOEXEC) {
+ warn "got FD:".fileno($s)." w/o CLOEXEC\n";
+ }
+ fcntl($s, F_SETFD, $fl &= ~FD_CLOEXEC);
+ dup2(fileno($s), $fd) or die "dup2 failed: $!\n";
+ }
+ %ENV = (%ENV, %$env) if $env;
+ my $fds = $fd - 3;
+ if ($fds > 0) {
+ $ENV{LISTEN_PID} = $$;
+ $ENV{LISTEN_FDS} = $fds;
+ }
+ $0 = join(' ', @$cmd);
+ if ($sub) {
+ _run_sub($sub, $key, \@argv);
+ POSIX::_exit($? >> 8);
+ } else {
+ exec(key2script($key), @argv);
+ die "FAIL: ",join(' ', $key, @argv), ": $!\n";
+ }
+ }
+ TestProcess->new($pid, $tail_pid);
+}
+
+package TestProcess;
+use strict;
+
+# prevent new threads from inheriting these objects
+sub CLONE_SKIP { 1 }
+
+sub new {
+ my ($klass, $pid, $tail_pid) = @_;
+ bless { pid => $pid, tail_pid => $tail_pid, owner => $$ }, $klass;
+}
+
+sub kill {
+ my ($self, $sig) = @_;
+ CORE::kill($sig // 'TERM', $self->{pid});
+}
+
+sub join {
+ my ($self) = @_;
+ my $pid = delete $self->{pid} or return;
+ my $ret = waitpid($pid, 0);
+ defined($ret) or die "waitpid($pid): $!";
+ $ret == $pid or die "waitpid($pid) != $ret";
+}
+
+sub DESTROY {
+ my ($self) = @_;
+ return if $self->{owner} != $$;
+ if (my $tail = delete $self->{tail_pid}) {
+ ::wait_for_tail();
+ CORE::kill('TERM', $tail);
+ }
+ my $pid = delete $self->{pid} or return;
+ CORE::kill('TERM', $pid);
+}
+