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# -*- cperl -*-
# Copyright (C) 2005-2006 MySQL AB
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
# This is a library file used by the Perl version of mysql-test-run,
# and is part of the translation of the Bourne shell script with the
# same name.
use Socket;
use Errno;
use strict;
sub mtr_init_timers ();
sub mtr_timer_start($$$);
sub mtr_timer_stop($$);
sub mtr_timer_stop_all($);
##############################################################################
#
# Initiate the structure shared by all timers
#
##############################################################################
sub mtr_init_timers () {
my $timers = { timers => {}, pids => {}};
return $timers;
}
##############################################################################
#
# Start, stop and poll a timer
#
# As alarm() isn't portable to Windows, we use separate processes to
# implement timers.
#
##############################################################################
sub mtr_timer_start($$$) {
my ($timers,$name,$duration)= @_;
mtr_verbose("mtr_timer_start: $name, $duration");
if ( exists $timers->{'timers'}->{$name} )
{
# We have an old running timer, kill it
mtr_verbose("There is an old timer running");
mtr_timer_stop($timers,$name);
}
FORK:
{
my $tpid= fork();
if ( ! defined $tpid )
{
if ( $! == $!{EAGAIN} ) # See "perldoc Errno"
{
mtr_warning("Got EAGAIN from fork(), sleep 1 second and redo");
sleep(1);
redo FORK;
}
else
{
mtr_error("can't fork");
}
}
if ( $tpid )
{
# Parent, record the information
mtr_verbose("timer parent, record info($name, $tpid, $duration)");
$timers->{'timers'}->{$name}->{'pid'}= $tpid;
$timers->{'timers'}->{$name}->{'duration'}= $duration;
$timers->{'pids'}->{$tpid}= $name;
}
else
{
# Child, redirect output and exec
# FIXME do we need to redirect streams?
# Don't do the ^C cleanup in the timeout child processes!
# There is actually a race here, if we get ^C after fork(), but before
# clearing the signal handler.
$SIG{INT}= 'DEFAULT';
$0= "mtr_timer(timers,$name,$duration)";
mtr_verbose("timer child $name, sleep $duration");
sleep($duration);
exit(0);
}
}
}
sub mtr_timer_stop ($$) {
my ($timers,$name)= @_;
mtr_verbose("mtr_timer_stop: $name");
if ( exists $timers->{'timers'}->{$name} )
{
my $tpid= $timers->{'timers'}->{$name}->{'pid'};
mtr_verbose("Stopping timer with pid $tpid");
# FIXME as Cygwin reuses pids fast, maybe check that is
# the expected process somehow?!
kill(9, $tpid);
# As the timers are so simple programs, we trust them to terminate,
# and use blocking wait for it. We wait just to avoid a zombie.
waitpid($tpid,0);
delete $timers->{'timers'}->{$name}; # Remove the timer information
delete $timers->{'pids'}->{$tpid}; # and PID reference
return 1;
}
else
{
mtr_error("Asked to stop timer \"$name\" not started");
return 0;
}
}
sub mtr_timer_stop_all ($) {
my $timers= shift;
foreach my $name ( keys %{$timers->{'timers'}} )
{
mtr_timer_stop($timers, $name);
}
return 1;
}
sub mtr_timer_timeout ($$) {
my ($timers,$pid)= @_;
return "" unless exists $timers->{'pids'}->{$pid};
# We got a timeout, return the name ot the timer
return $timers->{'pids'}->{$pid};
}
1;
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