From ca885bd5905b7faa9ecb7b0eb02476de1d3a7f88 Mon Sep 17 00:00:00 2001
From: Eric Wong <e@80x24.org>
Date: Sat, 27 Feb 2016 02:14:23 +0000
Subject: initial spawn implementation using vfork

Under Linux, vfork maintains constant performance as
parent process size increases.  fork needs to prepare pages
for copy-on-write, requiring a linear scan of the address
space.
---
 t/spawn.t | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 t/spawn.t

(limited to 't')

diff --git a/t/spawn.t b/t/spawn.t
new file mode 100644
index 00000000..ed9b5b08
--- /dev/null
+++ b/t/spawn.t
@@ -0,0 +1,53 @@
+# Copyright (C) 2015 all contributors <meta@public-inbox.org>
+# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+use strict;
+use warnings;
+use Test::More;
+use PublicInbox::Spawn qw(which spawn);
+
+{
+	my $true = which('true');
+	ok($true, "'true' command found with which()");
+}
+
+{
+	my $pid = spawn(['true']);
+	ok($pid, 'spawned process');
+	is(waitpid($pid, 0), $pid, 'waitpid succeeds on spawned process');
+	is($?, 0, 'true exited successfully');
+}
+
+{
+	my ($r, $w);
+	pipe $r, $w or die "pipe failed: $!";
+	my $pid = spawn(['echo', 'hello world'], undef, { 1 => fileno($w) });
+	close $w or die "close pipe[1] failed: $!";
+	is(<$r>, "hello world\n", 'read stdout of spawned from pipe');
+	is(waitpid($pid, 0), $pid, 'waitpid succeeds on spawned process');
+	is($?, 0, 'true exited successfully');
+}
+
+{
+	my ($r, $w);
+	pipe $r, $w or die "pipe failed: $!";
+	my $pid = spawn(['sh', '-c', 'echo $HELLO'],
+		{ 'HELLO' => 'world' }, { 1 => fileno($w) });
+	close $w or die "close pipe[1] failed: $!";
+	is(<$r>, "world\n", 'read stdout of spawned from pipe');
+	is(waitpid($pid, 0), $pid, 'waitpid succeeds on spawned process');
+	is($?, 0, 'sh exited successfully');
+}
+
+{
+	my ($r, $w);
+	pipe $r, $w or die "pipe failed: $!";
+	my $pid = spawn(['env'], {}, { -env => 1, 1 => fileno($w) });
+	close $w or die "close pipe[1] failed: $!";
+	ok(!defined(<$r>), 'read stdout of spawned from pipe');
+	is(waitpid($pid, 0), $pid, 'waitpid succeeds on spawned process');
+	is($?, 0, 'env(1) exited successfully');
+}
+
+done_testing();
+
+1;
-- 
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