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| | # Copyright (c) 2009 Eric Wong
require 'test/test_helper'
do_test = true
$unicorn_bin = ENV['UNICORN_TEST_BIN'] || "unicorn"
redirect_test_io do
do_test = system($unicorn_bin, '-v')
end
unless do_test
warn "#{$unicorn_bin} not found in PATH=#{ENV['PATH']}, " \
"skipping this test"
end
unless try_require('rack')
warn "Unable to load Rack, skipping this test"
do_test = false
end
class ExecTest < Test::Unit::TestCase
trap(:QUIT, 'IGNORE')
HI = <<-EOS
use Rack::ContentLength
run proc { |env| [ 200, { 'Content-Type' => 'text/plain' }, [ "HI\\n" ] ] }
EOS
HELLO = <<-EOS
class Hello
def call(env)
[ 200, { 'Content-Type' => 'text/plain' }, [ "HI\\n" ] ]
end
end
EOS
COMMON_TMP = Tempfile.new('unicorn_tmp') unless defined?(COMMON_TMP)
HEAVY_CFG = <<-EOS
worker_processes 4
timeout 30
logger Logger.new('#{COMMON_TMP.path}')
before_fork do |server, worker|
server.logger.info "before_fork: worker=\#{worker.nr}"
end
EOS
def setup
@pwd = Dir.pwd
@tmpfile = Tempfile.new('unicorn_exec_test')
@tmpdir = @tmpfile.path
@tmpfile.close!
Dir.mkdir(@tmpdir)
Dir.chdir(@tmpdir)
@addr = ENV['UNICORN_TEST_ADDR'] || '127.0.0.1'
@port = unused_port(@addr)
@sockets = []
@start_pid = $$
end
def teardown
return if @start_pid != $$
Dir.chdir(@pwd)
FileUtils.rmtree(@tmpdir)
@sockets.each { |path| File.unlink(path) rescue nil }
loop do
Process.kill('-QUIT', 0)
begin
Process.waitpid(-1, Process::WNOHANG) or break
rescue Errno::ECHILD
break
end
end
end
def test_exit_signals
%w(INT TERM QUIT).each do |sig|
File.open("config.ru", "wb") { |fp| fp.syswrite(HI) }
pid = xfork { redirect_test_io { exec($unicorn_bin, "-l#@addr:#@port") } }
wait_master_ready("test_stderr.#{pid}.log")
wait_workers_ready("test_stderr.#{pid}.log", 1)
status = nil
assert_nothing_raised do
Process.kill(sig, pid)
pid, status = Process.waitpid2(pid)
end
reaped = File.readlines("test_stderr.#{pid}.log").grep(/reaped/)
assert_equal 1, reaped.size
assert status.exited?
end
end
def test_basic
File.open("config.ru", "wb") { |fp| fp.syswrite(HI) }
pid = fork do
redirect_test_io { exec($unicorn_bin, "-l", "#{@addr}:#{@port}") }
end
results = retry_hit(["http://#{@addr}:#{@port}/"])
assert_equal String, results[0].class
assert_shutdown(pid)
end
def test_ttin_ttou
File.open("config.ru", "wb") { |fp| fp.syswrite(HI) }
pid = fork { redirect_test_io { exec($unicorn_bin, "-l#@addr:#@port") } }
log = "test_stderr.#{pid}.log"
wait_master_ready(log)
[ 2, 3].each { |i|
assert_nothing_raised { Process.kill(:TTIN, pid) }
wait_workers_ready(log, i)
}
File.truncate(log, 0)
reaped = nil
[ 2, 1, 0].each { |i|
assert_nothing_raised { Process.kill(:TTOU, pid) }
DEFAULT_TRIES.times {
sleep DEFAULT_RES
reaped = File.readlines(log).grep(/reaped.*\s*worker=#{i}$/)
break if reaped.size == 1
}
assert_equal 1, reaped.size
}
end
def test_help
redirect_test_io do
assert(system($unicorn_bin, "-h"), "help text returns true")
end
assert_equal 0, File.stat("test_stderr.#$$.log").size
assert_not_equal 0, File.stat("test_stdout.#$$.log").size
lines = File.readlines("test_stdout.#$$.log")
# Be considerate of the on-call technician working from their
# mobile phone or netbook on a slow connection :)
assert lines.size <= 24, "help height fits in an ANSI terminal window"
lines.each do |line|
assert line.size <= 80, "help width fits in an ANSI terminal window"
end
end
def test_broken_reexec_config
File.open("config.ru", "wb") { |fp| fp.syswrite(HI) }
pid_file = "#{@tmpdir}/test.pid"
old_file = "#{pid_file}.oldbin"
ucfg = Tempfile.new('unicorn_test_config')
ucfg.syswrite("listen %(#@addr:#@port)\n")
ucfg.syswrite("pid %(#{pid_file})\n")
ucfg.syswrite("logger Logger.new(%(#{@tmpdir}/log))\n")
pid = xfork do
redirect_test_io do
exec($unicorn_bin, "-D", "-l#{@addr}:#{@port}", "-c#{ucfg.path}")
end
end
results = retry_hit(["http://#{@addr}:#{@port}/"])
assert_equal String, results[0].class
wait_for_file(pid_file)
Process.waitpid(pid)
Process.kill(:USR2, File.read(pid_file).to_i)
wait_for_file(old_file)
wait_for_file(pid_file)
old_pid = File.read(old_file).to_i
Process.kill(:QUIT, old_pid)
wait_for_death(old_pid)
ucfg.syswrite("timeout %(#{pid_file})\n") # introduce a bug
current_pid = File.read(pid_file).to_i
Process.kill(:USR2, current_pid)
# wait for pid_file to restore itself
tries = DEFAULT_TRIES
begin
while current_pid != File.read(pid_file).to_i
sleep(DEFAULT_RES) and (tries -= 1) > 0
end
rescue Errno::ENOENT
(sleep(DEFAULT_RES) and (tries -= 1) > 0) and retry
end
assert_equal current_pid, File.read(pid_file).to_i
tries = DEFAULT_TRIES
while File.exist?(old_file)
(sleep(DEFAULT_RES) and (tries -= 1) > 0) or break
end
assert ! File.exist?(old_file), "oldbin=#{old_file} gone"
port2 = unused_port(@addr)
# fix the bug
ucfg.sysseek(0)
ucfg.truncate(0)
ucfg.syswrite("listen %(#@addr:#@port)\n")
ucfg.syswrite("listen %(#@addr:#{port2})\n")
ucfg.syswrite("pid %(#{pid_file})\n")
assert_nothing_raised { Process.kill(:USR2, current_pid) }
wait_for_file(old_file)
wait_for_file(pid_file)
new_pid = File.read(pid_file).to_i
assert_not_equal current_pid, new_pid
assert_equal current_pid, File.read(old_file).to_i
results = retry_hit(["http://#{@addr}:#{@port}/",
"http://#{@addr}:#{port2}/"])
assert_equal String, results[0].class
assert_equal String, results[1].class
assert_nothing_raised do
Process.kill(:QUIT, current_pid)
Process.kill(:QUIT, new_pid)
end
end
def test_broken_reexec_ru
File.open("config.ru", "wb") { |fp| fp.syswrite(HI) }
pid_file = "#{@tmpdir}/test.pid"
old_file = "#{pid_file}.oldbin"
ucfg = Tempfile.new('unicorn_test_config')
ucfg.syswrite("pid %(#{pid_file})\n")
ucfg.syswrite("logger Logger.new(%(#{@tmpdir}/log))\n")
pid = xfork do
redirect_test_io do
exec($unicorn_bin, "-D", "-l#{@addr}:#{@port}", "-c#{ucfg.path}")
end
end
results = retry_hit(["http://#{@addr}:#{@port}/"])
assert_equal String, results[0].class
wait_for_file(pid_file)
Process.waitpid(pid)
Process.kill(:USR2, File.read(pid_file).to_i)
wait_for_file(old_file)
wait_for_file(pid_file)
old_pid = File.read(old_file).to_i
Process.kill(:QUIT, old_pid)
wait_for_death(old_pid)
File.unlink("config.ru") # break reloading
current_pid = File.read(pid_file).to_i
Process.kill(:USR2, current_pid)
# wait for pid_file to restore itself
tries = DEFAULT_TRIES
begin
while current_pid != File.read(pid_file).to_i
sleep(DEFAULT_RES) and (tries -= 1) > 0
end
rescue Errno::ENOENT
(sleep(DEFAULT_RES) and (tries -= 1) > 0) and retry
end
tries = DEFAULT_TRIES
while File.exist?(old_file)
(sleep(DEFAULT_RES) and (tries -= 1) > 0) or break
end
assert ! File.exist?(old_file), "oldbin=#{old_file} gone"
assert_equal current_pid, File.read(pid_file).to_i
# fix the bug
File.open("config.ru", "wb") { |fp| fp.syswrite(HI) }
assert_nothing_raised { Process.kill(:USR2, current_pid) }
wait_for_file(old_file)
wait_for_file(pid_file)
new_pid = File.read(pid_file).to_i
assert_not_equal current_pid, new_pid
assert_equal current_pid, File.read(old_file).to_i
results = retry_hit(["http://#{@addr}:#{@port}/"])
assert_equal String, results[0].class
assert_nothing_raised do
Process.kill(:QUIT, current_pid)
Process.kill(:QUIT, new_pid)
end
end
def test_unicorn_config_listener_swap
port_cli = unused_port
File.open("config.ru", "wb") { |fp| fp.syswrite(HI) }
ucfg = Tempfile.new('unicorn_test_config')
ucfg.syswrite("listen '#@addr:#@port'\n")
pid = xfork do
redirect_test_io do
exec($unicorn_bin, "-c#{ucfg.path}", "-l#@addr:#{port_cli}")
end
end
results = retry_hit(["http://#@addr:#{port_cli}/"])
assert_equal String, results[0].class
results = retry_hit(["http://#@addr:#@port/"])
assert_equal String, results[0].class
port2 = unused_port(@addr)
ucfg.sysseek(0)
ucfg.truncate(0)
ucfg.syswrite("listen '#@addr:#{port2}'\n")
Process.kill(:HUP, pid)
results = retry_hit(["http://#@addr:#{port2}/"])
assert_equal String, results[0].class
results = retry_hit(["http://#@addr:#{port_cli}/"])
assert_equal String, results[0].class
assert_nothing_raised do
reuse = TCPServer.new(@addr, @port)
reuse.close
end
assert_shutdown(pid)
end
def test_unicorn_config_listen_with_options
File.open("config.ru", "wb") { |fp| fp.syswrite(HI) }
ucfg = Tempfile.new('unicorn_test_config')
ucfg.syswrite("listen '#{@addr}:#{@port}', :backlog => 512,\n")
ucfg.syswrite(" :rcvbuf => 4096,\n")
ucfg.syswrite(" :sndbuf => 4096\n")
pid = xfork do
redirect_test_io { exec($unicorn_bin, "-c#{ucfg.path}") }
end
results = retry_hit(["http://#{@addr}:#{@port}/"])
assert_equal String, results[0].class
assert_shutdown(pid)
end
def test_unicorn_config_per_worker_listen
port2 = unused_port
pid_spit = 'use Rack::ContentLength;' \
'run proc { |e| [ 200, {"Content-Type"=>"text/plain"}, ["#$$\\n"] ] }'
File.open("config.ru", "wb") { |fp| fp.syswrite(pid_spit) }
tmp = Tempfile.new('test.socket')
File.unlink(tmp.path)
ucfg = Tempfile.new('unicorn_test_config')
ucfg.syswrite("listen '#@addr:#@port'\n")
ucfg.syswrite("before_fork { |s,w|\n")
ucfg.syswrite(" s.listen('#{tmp.path}', :backlog => 5, :sndbuf => 8192)\n")
ucfg.syswrite(" s.listen('#@addr:#{port2}', :rcvbuf => 8192)\n")
ucfg.syswrite("\n}\n")
pid = xfork do
redirect_test_io { exec($unicorn_bin, "-c#{ucfg.path}") }
end
results = retry_hit(["http://#{@addr}:#{@port}/"])
assert_equal String, results[0].class
worker_pid = results[0].to_i
assert_not_equal pid, worker_pid
s = UNIXSocket.new(tmp.path)
s.syswrite("GET / HTTP/1.0\r\n\r\n")
results = ''
loop { results << s.sysread(4096) } rescue nil
assert_nothing_raised { s.close }
assert_equal worker_pid, results.split(/\r\n/).last.to_i
results = hit(["http://#@addr:#{port2}/"])
assert_equal String, results[0].class
assert_equal worker_pid, results[0].to_i
assert_shutdown(pid)
end
def test_unicorn_config_listen_augments_cli
port2 = unused_port(@addr)
File.open("config.ru", "wb") { |fp| fp.syswrite(HI) }
ucfg = Tempfile.new('unicorn_test_config')
ucfg.syswrite("listen '#{@addr}:#{@port}'\n")
pid = xfork do
redirect_test_io do
exec($unicorn_bin, "-c#{ucfg.path}", "-l#{@addr}:#{port2}")
end
end
uris = [@port, port2].map { |i| "http://#{@addr}:#{i}/" }
results = retry_hit(uris)
assert_equal results.size, uris.size
assert_equal String, results[0].class
assert_equal String, results[1].class
assert_shutdown(pid)
end
def test_weird_config_settings
File.open("config.ru", "wb") { |fp| fp.syswrite(HI) }
ucfg = Tempfile.new('unicorn_test_config')
ucfg.syswrite(HEAVY_CFG)
pid = xfork do
redirect_test_io do
exec($unicorn_bin, "-c#{ucfg.path}", "-l#{@addr}:#{@port}")
end
end
results = retry_hit(["http://#{@addr}:#{@port}/"])
assert_equal String, results[0].class
wait_master_ready(COMMON_TMP.path)
wait_workers_ready(COMMON_TMP.path, 4)
bf = File.readlines(COMMON_TMP.path).grep(/\bbefore_fork: worker=/)
assert_equal 4, bf.size
rotate = Tempfile.new('unicorn_rotate')
assert_nothing_raised do
File.rename(COMMON_TMP.path, rotate.path)
Process.kill(:USR1, pid)
end
wait_for_file(COMMON_TMP.path)
assert File.exist?(COMMON_TMP.path), "#{COMMON_TMP.path} exists"
# USR1 should've been passed to all workers
tries = DEFAULT_TRIES
log = File.readlines(rotate.path)
while (tries -= 1) > 0 &&
log.grep(/reopening logs\.\.\./).size < 5
sleep DEFAULT_RES
log = File.readlines(rotate.path)
end
assert_equal 5, log.grep(/reopening logs\.\.\./).size
assert_equal 0, log.grep(/done reopening logs/).size
tries = DEFAULT_TRIES
log = File.readlines(COMMON_TMP.path)
while (tries -= 1) > 0 && log.grep(/done reopening logs/).size < 5
sleep DEFAULT_RES
log = File.readlines(COMMON_TMP.path)
end
assert_equal 5, log.grep(/done reopening logs/).size
assert_equal 0, log.grep(/reopening logs\.\.\./).size
assert_nothing_raised { Process.kill(:QUIT, pid) }
status = nil
assert_nothing_raised { pid, status = Process.waitpid2(pid) }
assert status.success?, "exited successfully"
end
def test_read_embedded_cli_switches
File.open("config.ru", "wb") do |fp|
fp.syswrite("#\\ -p #{@port} -o #{@addr}\n")
fp.syswrite(HI)
end
pid = fork { redirect_test_io { exec($unicorn_bin) } }
results = retry_hit(["http://#{@addr}:#{@port}/"])
assert_equal String, results[0].class
assert_shutdown(pid)
end
def test_config_ru_alt_path
config_path = "#{@tmpdir}/foo.ru"
File.open(config_path, "wb") { |fp| fp.syswrite(HI) }
pid = fork do
redirect_test_io do
Dir.chdir("/")
exec($unicorn_bin, "-l#{@addr}:#{@port}", config_path)
end
end
results = retry_hit(["http://#{@addr}:#{@port}/"])
assert_equal String, results[0].class
assert_shutdown(pid)
end
def test_load_module
libdir = "#{@tmpdir}/lib"
FileUtils.mkpath([ libdir ])
config_path = "#{libdir}/hello.rb"
File.open(config_path, "wb") { |fp| fp.syswrite(HELLO) }
pid = fork do
redirect_test_io do
Dir.chdir("/")
exec($unicorn_bin, "-l#{@addr}:#{@port}", config_path)
end
end
results = retry_hit(["http://#{@addr}:#{@port}/"])
assert_equal String, results[0].class
assert_shutdown(pid)
end
def test_reexec
File.open("config.ru", "wb") { |fp| fp.syswrite(HI) }
pid_file = "#{@tmpdir}/test.pid"
pid = fork do
redirect_test_io do
exec($unicorn_bin, "-l#{@addr}:#{@port}", "-P#{pid_file}")
end
end
reexec_basic_test(pid, pid_file)
end
def test_reexec_alt_config
config_file = "#{@tmpdir}/foo.ru"
File.open(config_file, "wb") { |fp| fp.syswrite(HI) }
pid_file = "#{@tmpdir}/test.pid"
pid = fork do
redirect_test_io do
exec($unicorn_bin, "-l#{@addr}:#{@port}", "-P#{pid_file}", config_file)
end
end
reexec_basic_test(pid, pid_file)
end
def test_socket_unlinked_restore
results = nil
sock = Tempfile.new('unicorn_test_sock')
sock_path = sock.path
@sockets << sock_path
sock.close!
ucfg = Tempfile.new('unicorn_test_config')
ucfg.syswrite("listen \"#{sock_path}\"\n")
File.open("config.ru", "wb") { |fp| fp.syswrite(HI) }
pid = xfork { redirect_test_io { exec($unicorn_bin, "-c#{ucfg.path}") } }
wait_for_file(sock_path)
assert File.socket?(sock_path)
assert_nothing_raised do
sock = UNIXSocket.new(sock_path)
sock.syswrite("GET / HTTP/1.0\r\n\r\n")
results = sock.sysread(4096)
end
assert_equal String, results.class
assert_nothing_raised do
File.unlink(sock_path)
Process.kill(:HUP, pid)
end
wait_for_file(sock_path)
assert File.socket?(sock_path)
assert_nothing_raised do
sock = UNIXSocket.new(sock_path)
sock.syswrite("GET / HTTP/1.0\r\n\r\n")
results = sock.sysread(4096)
end
assert_equal String, results.class
end
def test_unicorn_config_file
pid_file = "#{@tmpdir}/test.pid"
sock = Tempfile.new('unicorn_test_sock')
sock_path = sock.path
sock.close!
@sockets << sock_path
log = Tempfile.new('unicorn_test_log')
ucfg = Tempfile.new('unicorn_test_config')
ucfg.syswrite("listen \"#{sock_path}\"\n")
ucfg.syswrite("pid \"#{pid_file}\"\n")
ucfg.syswrite("logger Logger.new('#{log.path}')\n")
ucfg.close
File.open("config.ru", "wb") { |fp| fp.syswrite(HI) }
pid = xfork do
redirect_test_io do
exec($unicorn_bin, "-l#{@addr}:#{@port}",
"-P#{pid_file}", "-c#{ucfg.path}")
end
end
results = retry_hit(["http://#{@addr}:#{@port}/"])
assert_equal String, results[0].class
wait_master_ready(log.path)
assert File.exist?(pid_file), "pid_file created"
assert_equal pid, File.read(pid_file).to_i
assert File.socket?(sock_path), "socket created"
assert_nothing_raised do
sock = UNIXSocket.new(sock_path)
sock.syswrite("GET / HTTP/1.0\r\n\r\n")
results = sock.sysread(4096)
end
assert_equal String, results.class
# try reloading the config
sock = Tempfile.new('new_test_sock')
new_sock_path = sock.path
@sockets << new_sock_path
sock.close!
new_log = Tempfile.new('unicorn_test_log')
new_log.sync = true
assert_equal 0, new_log.size
assert_nothing_raised do
ucfg = File.open(ucfg.path, "wb")
ucfg.syswrite("listen \"#{sock_path}\"\n")
ucfg.syswrite("listen \"#{new_sock_path}\"\n")
ucfg.syswrite("pid \"#{pid_file}\"\n")
ucfg.syswrite("logger Logger.new('#{new_log.path}')\n")
ucfg.close
Process.kill(:HUP, pid)
end
wait_for_file(new_sock_path)
assert File.socket?(new_sock_path), "socket exists"
@sockets.each do |path|
assert_nothing_raised do
sock = UNIXSocket.new(path)
sock.syswrite("GET / HTTP/1.0\r\n\r\n")
results = sock.sysread(4096)
end
assert_equal String, results.class
end
assert_not_equal 0, new_log.size
reexec_usr2_quit_test(pid, pid_file)
end
def test_daemonize_reexec
pid_file = "#{@tmpdir}/test.pid"
log = Tempfile.new('unicorn_test_log')
ucfg = Tempfile.new('unicorn_test_config')
ucfg.syswrite("pid \"#{pid_file}\"\n")
ucfg.syswrite("logger Logger.new('#{log.path}')\n")
ucfg.close
File.open("config.ru", "wb") { |fp| fp.syswrite(HI) }
pid = xfork do
redirect_test_io do
exec($unicorn_bin, "-D", "-l#{@addr}:#{@port}", "-c#{ucfg.path}")
end
end
results = retry_hit(["http://#{@addr}:#{@port}/"])
assert_equal String, results[0].class
wait_for_file(pid_file)
new_pid = File.read(pid_file).to_i
assert_not_equal pid, new_pid
pid, status = Process.waitpid2(pid)
assert status.success?, "original process exited successfully"
assert_nothing_raised { Process.kill(0, new_pid) }
reexec_usr2_quit_test(new_pid, pid_file)
end
def test_daemonize_redirect_fail
pid_file = "#{@tmpdir}/test.pid"
log = Tempfile.new('unicorn_test_log')
ucfg = Tempfile.new('unicorn_test_config')
ucfg.syswrite("pid #{pid_file}\"\n")
err = Tempfile.new('stderr')
out = Tempfile.new('stdout ')
File.open("config.ru", "wb") { |fp| fp.syswrite(HI) }
pid = xfork do
$stderr.reopen(err.path, "a")
$stdout.reopen(out.path, "a")
exec($unicorn_bin, "-D", "-l#{@addr}:#{@port}", "-c#{ucfg.path}")
end
pid, status = Process.waitpid2(pid)
assert status.success?, "original process exited successfully"
sleep 1 # can't waitpid on a daemonized process :<
assert err.stat.size > 0
end
def test_reexec_fd_leak
unless RUBY_PLATFORM =~ /linux/ # Solaris may work, too, but I forget...
warn "FD leak test only works on Linux at the moment"
return
end
pid_file = "#{@tmpdir}/test.pid"
log = Tempfile.new('unicorn_test_log')
log.sync = true
ucfg = Tempfile.new('unicorn_test_config')
ucfg.syswrite("pid \"#{pid_file}\"\n")
ucfg.syswrite("logger Logger.new('#{log.path}')\n")
ucfg.syswrite("stderr_path '#{log.path}'\n")
ucfg.syswrite("stdout_path '#{log.path}'\n")
ucfg.close
File.open("config.ru", "wb") { |fp| fp.syswrite(HI) }
pid = xfork do
redirect_test_io do
exec($unicorn_bin, "-D", "-l#{@addr}:#{@port}", "-c#{ucfg.path}")
end
end
wait_master_ready(log.path)
wait_workers_ready(log.path, 1)
File.truncate(log.path, 0)
wait_for_file(pid_file)
orig_pid = pid = File.read(pid_file).to_i
orig_fds = `ls -l /proc/#{pid}/fd`.split(/\n/)
assert $?.success?
expect_size = orig_fds.size
assert_nothing_raised do
Process.kill(:USR2, pid)
wait_for_file("#{pid_file}.oldbin")
Process.kill(:QUIT, pid)
end
wait_for_death(pid)
wait_master_ready(log.path)
wait_workers_ready(log.path, 1)
File.truncate(log.path, 0)
wait_for_file(pid_file)
pid = File.read(pid_file).to_i
assert_not_equal orig_pid, pid
curr_fds = `ls -l /proc/#{pid}/fd`.split(/\n/)
assert $?.success?
# we could've inherited descriptors the first time around
assert expect_size >= curr_fds.size, curr_fds.inspect
expect_size = curr_fds.size
assert_nothing_raised do
Process.kill(:USR2, pid)
wait_for_file("#{pid_file}.oldbin")
Process.kill(:QUIT, pid)
end
wait_for_death(pid)
wait_master_ready(log.path)
wait_workers_ready(log.path, 1)
File.truncate(log.path, 0)
wait_for_file(pid_file)
pid = File.read(pid_file).to_i
curr_fds = `ls -l /proc/#{pid}/fd`.split(/\n/)
assert $?.success?
assert_equal expect_size, curr_fds.size, curr_fds.inspect
Process.kill(:QUIT, pid)
wait_for_death(pid)
end
end if do_test
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