tests: consolidate process spawning code.

[public-inbox.git] / t / common.perl

diff --git a/t/common.perl b/t/common.perl
index 5c5fcd84890dbef23a07c2529c28b8341acc6bd7..688e30ad99cbee6c39a186c289a42eca4d3465e3 100644 (file)
--- a/t/common.perl
+++ b/t/common.perl
@@ -1,6 +1,9 @@
 # Copyright (C) 2015-2018 all contributors <meta@public-inbox.org>
 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
 
+use Fcntl qw(FD_CLOEXEC F_SETFD F_GETFD);
+use POSIX qw(dup2);
+
 sub stream_to_string {
        my ($res) = @_;
        my $body = $res->[2];
@@ -12,4 +15,28 @@ sub stream_to_string {
        $str;
 }
 
+sub spawn_listener {
+       my ($env, $cmd, $socks) = @_;
+       my $pid = fork;
+       defined $pid or die "fork failed: $!\n";
+       if ($pid == 0) {
+               # pretend to be systemd (cf. sd_listen_fds(3))
+               my $fd = 3; # 3 == SD_LISTEN_FDS_START
+               foreach my $s (@$socks) {
+                       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{LISTEN_PID} = $$;
+               $ENV{LISTEN_FDS} = scalar @$socks;
+               %ENV = (%ENV, %$env) if $env;
+               exec @$cmd;
+               die "FAIL: ",join(' ', @$cmd), ": $!\n";
+       }
+       $pid;
+}
+
 1;