# -*- cperl -*- # Copyright (c) 2004-2006 MySQL AB, 2008 Sun Microsystems, Inc. # Use is subject to license terms. # # 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 02110-1335 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;
use POSIX qw(WNOHANG SIGHUP);
sub mtr_run ($$$$$$;$);
sub mtr_spawn ($$$$$$;$);
sub mtr_check_stop_servers ($);
sub mtr_kill_leftovers ();
sub mtr_wait_blocking ($);
sub mtr_record_dead_children ();
sub mtr_mysqladmin_start($$$);
sub mtr_exit ($);
sub sleep_until_file_created ($$$);
sub mtr_kill_processes ($);
sub mtr_ping_with_timeout($);
sub mtr_ping_port ($);
# Local function
sub spawn_impl ($$$$$$$);
############################################################################## # # Execute an external command # ##############################################################################
sub mtr_run ($$$$$$;$) {
my $path= shift;
my $arg_list_t= shift;
my $input= shift;
my $output= shift;
my $error= shift;
my $pid_file= shift; # Not used
my $spawn_opts= shift;
sub mtr_run_test ($$$$$$;$) {
my $path= shift;
my $arg_list_t= shift;
my $input= shift;
my $output= shift;
my $error= shift;
my $pid_file= shift; # Not used
my $spawn_opts= shift;
sub mtr_spawn ($$$$$$;$) {
my $path= shift;
my $arg_list_t= shift;
my $input= shift;
my $output= shift;
my $error= shift;
my $pid_file= shift; # Not used
my $spawn_opts= shift;
sub spawn_impl ($$$$$$$) {
my $path= shift;
my $arg_list_t= shift;
my $mode= shift;
my $input= shift;
my $output= shift;
my $error= shift;
my $spawn_opts= shift;
if ( $::opt_script_debug )
{
mtr_report("");
mtr_debug("-" x 73);
mtr_debug("STDIN $input") if $input;
mtr_debug("STDOUT $output") if $output;
mtr_debug("STDERR $error") if $error;
mtr_debug("$mode: $path ", join(" ",@$arg_list_t));
mtr_debug("spawn options:"); if ($spawn_opts)
{ foreach my $key (sort keys %{$spawn_opts})
{
mtr_debug(" - $key: $spawn_opts->{$key}");
}
} else
{
mtr_debug(" none");
}
mtr_debug("-" x 73);
mtr_report("");
}
mtr_error("Can't spawn with empty \"path\"") unless defined $path;
FORK:
{
my $pid= fork();
if ( ! defined $pid )
{ if ( $! == $!{EAGAIN} ) # See "perldoc Errno"
{
mtr_warning("Got EAGAIN from fork(), sleep 1 second and redo");
sleep(1);
redo FORK;
}
mtr_error("$path ($pid) can't be forked, error: $!");
}
if ( $pid )
{
select(STDOUT) if $::glob_win32_perl;
return spawn_parent_impl($pid,$mode,$path);
} else
{ # Child, redirect output and exec
$SIG{INT}= 'DEFAULT'; # Parent do some stuff, we don't
my $log_file_open_mode = '>';
if ($spawn_opts and $spawn_opts->{'append_log_file'})
{
$log_file_open_mode = '>>';
}
if ( $output )
{ if ( $::glob_win32_perl )
{ # Don't redirect stdout on ActiveState perl since this is # just another thread in the same process.
}
elsif ( ! open(STDOUT,$log_file_open_mode,$output) )
{
mtr_child_error("can't redirect STDOUT to \"$output\": $!");
}
}
if ( $error )
{ if ( !$::glob_win32_perl and $output eq $error )
{ if ( ! open(STDERR,">&STDOUT") )
{
mtr_child_error("can't dup STDOUT: $!");
}
} else
{ if ( ! open(STDERR,$log_file_open_mode,$error) )
{
mtr_child_error("can't redirect STDERR to \"$error\": $!");
}
}
}
if ( $input )
{ if ( ! open(STDIN,"<",$input) )
{
mtr_child_error("can't redirect STDIN to \"$input\": $!");
}
}
if ( ! exec($path,@$arg_list_t) )
{
mtr_child_error("failed to execute \"$path\": $!");
}
mtr_error("Should never come here 1!");
}
mtr_error("Should never come here 2!");
}
mtr_error("Should never come here 3!");
}
sub spawn_parent_impl {
my $pid= shift;
my $mode= shift;
my $path= shift;
if ( $mode eq 'run' or $mode eq 'test' )
{ if ( $mode eq 'run' )
{ # Simple run of command, wait blocking for it to return
my $ret_pid= waitpid($pid,0); if ( $ret_pid != $pid )
{ # The "simple" waitpid has failed, print debug info # and try to handle the error
mtr_warning("waitpid($pid, 0) returned $ret_pid " . "when waiting for '$path', error: '$!'"); if ( $ret_pid == -1 )
{ # waitpid returned -1, that would indicate the process # no longer exist and waitpid couldn't wait for it.
return 1;
}
mtr_error("Error handling failed");
}
return mtr_process_exit_status($?);
} else
{ # We run mysqltest and wait for it to return. But we try to # catch dying mysqld processes as well. # # We do blocking waitpid() until we get the return from the # "mysqltest" call. But if a mysqld process dies that we # started, we take this as an error, and kill mysqltest.
my $exit_value= -1;
my $saved_exit_value;
my $ret_pid; # What waitpid() returns
while ( ($ret_pid= waitpid(-1,0)) != -1 )
{ # Someone terminated, don't know who. Collect # status info first before $? is lost, # but not $exit_value, this is flagged from
my $timer_name= mtr_timer_timeout($::glob_timers, $ret_pid); if ( $timer_name )
{ if ( $timer_name eq "suite" )
{ # We give up here
print STDERR "\n";
kill(9, $pid); # Kill mysqltest
mtr_kill_leftovers(); # Kill servers the hard way
mtr_error("Test suite timeout");
}
elsif ( $timer_name eq "testcase" )
{
$saved_exit_value= 63; # Mark as timeout
kill(9, $pid); # Kill mysqltest
next; # Go on and catch the termination
}
}
if ( $ret_pid == $pid )
{ # We got termination of mysqltest, we are done
$exit_value= mtr_process_exit_status($?);
last;
}
# One of the child processes died, unless this was expected # mysqltest should be killed and test aborted
check_expected_crash_and_restart($ret_pid);
}
if ( $ret_pid != $pid )
{ # We terminated the waiting because a "mysqld" process died. # Kill the mysqltest process.
mtr_verbose("Kill mysqltest because another process died");
kill(9,$pid);
$ret_pid= waitpid($pid,0);
if ( $ret_pid != $pid )
{
mtr_error("$path ($pid) got lost somehow");
}
}
return $saved_exit_value || $exit_value;
}
} else
{ # We spawned a process we don't wait for
return $pid;
}
}
# ---------------------------------------------------------------------- # We try to emulate how an Unix shell calculates the exit code # ----------------------------------------------------------------------
sub mtr_process_exit_status {
my $raw_status= shift;
if ( $raw_status & 127 )
{
return ($raw_status & 127) + 128; # Signal num + 128
} else
{
return $raw_status >> 8; # Exit code
}
}
############################################################################## # # Kill processes left from previous runs # ##############################################################################
# Kill all processes that would conflict with this run # Make sure to remove the PID file, if any.
sub mtr_kill_leftovers () {
mtr_report("Killing Possible Leftover Processes");
mtr_debug("mtr_kill_leftovers(): started.");
my $pid= mtr_mysqladmin_start($srv, "shutdown", 20);
# Save the pid of the mysqladmin process
$admin_pids{$pid}= 1;
push(@kill_pids,{
pid => $srv->{'pid'},
pidfile => $srv->{'path_pid'},
sockfile => $srv->{'path_sock'},
port => $srv->{'port'},
});
$srv->{'pid'}= 0; # Assume we are done with it
}
# Wait for all the admin processes to complete
mtr_wait_blocking(\%admin_pids);
# If we trusted "mysqladmin --shutdown_timeout= ..." we could just # terminate now, but we don't (FIXME should be debugged). # So we try again to ping and at least wait the same amount of time # mysqladmin would for all to die.
mtr_ping_with_timeout(\@kill_pids);
# We now have tried to terminate nice. We have waited for the listen # port to be free, but can't really tell if the mysqld process died # or not. We now try to find the process PID from the PID file, and # send a kill to that process. Note that Perl lets kill(0,@pids) be # a way to just return the number of processes the kernel can send # signals to. So this can be used (except on Cygwin) to determine # if there are processes left running that we count out might exists. # # But still after all this work, all we know is that we have # the ports free.
# We scan the "var/run/" directory for other process id's to kill
my $rundir= "$::opt_vardir/run";
mtr_debug("Processing PID files in directory '$rundir'...");
if ( -d $rundir )
{
opendir(RUNDIR, $rundir)
or mtr_error("can't open directory \"$rundir\": $!");
my @pids;
while ( my $elem= readdir(RUNDIR) )
{ # Only read pid from files that end with .pid if ( $elem =~ /.*[.]pid$/)
{
my $pidfile= "$rundir/$elem";
if ( -f $pidfile )
{
mtr_debug("Processing PID file: '$pidfile'...");
my $pid= mtr_get_pid_from_file($pidfile);
mtr_debug("Got pid: $pid from file '$pidfile'");
if ( $::glob_cygwin_perl or kill(0, $pid) )
{
mtr_debug("There is process with pid $pid -- scheduling for kill.");
push(@pids, $pid); # We know (cygwin guess) it exists
} else
{
mtr_debug("There is no process with pid $pid -- skipping.");
}
}
}
}
closedir(RUNDIR);
if ( @pids )
{
mtr_debug("Killing the following processes with PID files: " .
join(' ', @pids) . "...");
start_reap_all();
if ( $::glob_cygwin_perl )
{ # We have no (easy) way of knowing the Cygwin controlling # process, in the PID file we only have the Windows process id.
system("kill -f " . join(" ",@pids)); # Hope for the best....
mtr_debug("Sleep 5 seconds waiting for processes to die");
sleep(5);
} else
{
my $retries= 10; # 10 seconds do
{
mtr_debug("Sending SIGKILL to pids: " . join(' ', @pids));
kill(9, @pids);
mtr_report("Sleep 1 second waiting for processes to die");
sleep(1) # Wait one second
} while ( $retries-- and kill(0, @pids) );
if ( kill(0, @pids) ) # Check if some left
{
mtr_warning("can't kill process(es) " . join(" ", @pids));
}
}
stop_reap_all();
}
} else
{
mtr_debug("Directory for PID files ($rundir) does not exist.");
}
# We may have failed everything, but we now check again if we have # the listen ports free to use, and if they are free, just go for it.
mtr_debug("Checking known mysqld servers...");
foreach my $srv ( @kill_pids )
{ if ( defined $srv->{'port'} and mtr_ping_port($srv->{'port'}) )
{
mtr_warning("can't kill old process holding port $srv->{'port'}");
}
}
mtr_debug("mtr_kill_leftovers(): finished.");
}
# # Check that all processes in "spec" are shutdown gracefully # else kill them off hard #
sub mtr_check_stop_servers ($) {
my $spec= shift;
# Return if no processes are defined
return if ! @$spec;
mtr_verbose("mtr_check_stop_servers");
# ---------------------------------------------------------------------- # Wait until servers in "spec" has stopped listening # to their ports or timeout occurs # ----------------------------------------------------------------------
mtr_ping_with_timeout(\@$spec);
# ---------------------------------------------------------------------- # Use waitpid() nonblocking for a little while, to see how # many process's will exit sucessfully. # This is the normal case. # ----------------------------------------------------------------------
my $wait_counter= 50; # Max number of times to redo the loop foreach my $srv ( @$spec )
{
my $pid= $srv->{'pid'};
my $ret_pid; if ( $pid )
{
$ret_pid= waitpid($pid,&WNOHANG); if ($ret_pid == $pid)
{
mtr_verbose("Caught exit of process $ret_pid");
$srv->{'pid'}= 0;
}
elsif ($ret_pid == 0)
{
mtr_verbose("Process $pid is still alive"); if ($wait_counter-- > 0)
{ # Give the processes more time to exit
select(undef, undef, undef, (0.1));
redo;
}
} else
{
mtr_warning("caught exit of unknown child $ret_pid");
}
}
}
# ---------------------------------------------------------------------- # The processes that haven't yet exited need to # be killed hard, put them in "kill_pids" hash # ----------------------------------------------------------------------
my %kill_pids; foreach my $srv ( @$spec )
{
my $pid= $srv->{'pid'}; if ( $pid )
{ # Server is still alive, put it in list to be hard killed if ($::glob_win32_perl)
{ # Kill the real process if it's known
$pid= $srv->{'real_pid'} if ($srv->{'real_pid'});
}
$kill_pids{$pid}= 1;
# Write a message to the process's error log (if it has one) # that it's being killed hard. if ( defined $srv->{'errfile'} )
{
mtr_tofile($srv->{'errfile'}, "Note: Forcing kill of process $pid\n");
}
mtr_warning("Forcing kill of process $pid");
} else
{ # Server is dead, remove the pidfile if it exists # # Race, could have been removed between test with -f # and the unlink() below, so better check again with -f if ( -f $srv->{'pidfile'} and ! unlink($srv->{'pidfile'}) and
-f $srv->{'pidfile'} )
{
mtr_error("can't remove $srv->{'pidfile'}");
}
}
}
if ( ! keys %kill_pids )
{ # All processes has exited gracefully
return;
}
mtr_kill_processes(\%kill_pids);
# ---------------------------------------------------------------------- # All processes are killed, cleanup leftover files # ----------------------------------------------------------------------
{
my $errors= 0; foreach my $srv ( @$spec )
{ if ( $srv->{'pid'} )
{ # Server has been hard killed, clean it's resources foreach my $file ($srv->{'pidfile'}, $srv->{'sockfile'})
{ # Know it is dead so should be no race, careful anyway if ( defined $file and -f $file and ! unlink($file) and -f $file )
{
$errors++;
mtr_warning("couldn't delete $file");
}
}
if ($::glob_win32_perl and $srv->{'real_pid'})
{ # Wait for the pseudo pid - if the real_pid was known # the pseudo pid has not been waited for yet, wait blocking # since it's "such a simple program"
mtr_verbose("Wait for pseudo process $srv->{'pid'}");
my $ret_pid= waitpid($srv->{'pid'}, 0);
mtr_verbose("Pseudo process $ret_pid died");
}
$srv->{'pid'}= 0;
}
} if ( $errors )
{ # There where errors killing processes # do one last attempt to ping the servers # and if they can't be pinged, assume they are dead if ( ! mtr_ping_with_timeout( \@$spec ) )
{
mtr_error("we could not kill or clean up all processes");
} else
{
mtr_verbose("All ports were free, continuing");
}
}
}
}
# Wait for all the process in the list to terminate
sub mtr_wait_blocking($) {
my $admin_pids= shift;
# Return if no processes defined
return if ! %$admin_pids;
mtr_verbose("mtr_wait_blocking");
# Wait for all the started processes to exit # As mysqladmin is such a simple program, we trust it to terminate itself. # I.e. we wait blocking, and wait for them all before we go on. foreach my $pid (keys %{$admin_pids})
{
my $ret_pid= waitpid($pid,0);
}
}
# Start "mysqladmin <command>" for a specific mysqld
sub mtr_mysqladmin_start($$$) {
my $srv= shift;
my $command= shift;
my $adm_shutdown_tmo= shift;
my $args;
mtr_init_args(\$args);
mtr_add_arg($args, "--no-defaults");
mtr_add_arg($args, "--user=%s", $::opt_user);
mtr_add_arg($args, "--password=");
mtr_add_arg($args, "--silent"); if ( -e $srv->{'path_sock'} )
{
mtr_add_arg($args, "--socket=%s", $srv->{'path_sock'});
} if ( $srv->{'port'} )
{
mtr_add_arg($args, "--port=%s", $srv->{'port'});
} if ( $srv->{'port'} and ! -e $srv->{'path_sock'} )
{
mtr_add_arg($args, "--protocol=tcp"); # Needed if no --socket
}
mtr_add_arg($args, "--connect_timeout=5");
# Shutdown time must be high as slave may be in reconnect
mtr_add_arg($args, "--shutdown_timeout=$adm_shutdown_tmo");
mtr_add_arg($args, "$command");
my $pid= mtr_spawn($::exe_mysqladmin, $args, "", "", "", "",
{ append_log_file => 1 });
mtr_verbose("mtr_mysqladmin_start, pid: $pid");
return $pid;
}
# Ping all servers in list, exit when none of them answers # or when timeout has passed
sub mtr_ping_with_timeout($) {
my $spec= shift;
my $timeout= 200; # 20 seconds max
my $res= 1; # If we just fall through, we are done # in the sense that the servers don't # listen to their ports any longer
mtr_debug("Waiting for mysqld servers to stop...");
TIME: while ( $timeout-- )
{ foreach my $srv ( @$spec )
{
$res= 1; # We are optimistic if ( $srv->{'pid'} and defined $srv->{'port'} )
{ if ( mtr_ping_port($srv->{'port'}) )
{
mtr_verbose("waiting for process $srv->{'pid'} to stop ". "using port $srv->{'port'}");
# Millisceond sleep emulated with select
select(undef, undef, undef, (0.1));
$res= 0;
next TIME;
} else
{ # Process was not using port
}
}
}
last; # If we got here, we are done
}
if ($res)
{
mtr_debug("mtr_ping_with_timeout(): All mysqld instances are down.");
} else
{
mtr_report("mtr_ping_with_timeout(): At least one server is alive.");
}
return $res;
}
# # Loop through our list of processes and look for and entry # with the provided pid # Set the pid of that process to 0 if found #
sub mark_process_dead($)
{
my $ret_pid= shift;
mtr_warning("mark_process_dead couldn't find an entry for pid: $ret_pid");
}
# # Loop through our list of processes and look for and entry # with the provided pid, if found check for the file indicating # expected crash and restart it. #
sub check_expected_crash_and_restart($)
{
my $ret_pid= shift;
foreach my $mysqld (@{$::master}, @{$::slave})
{ if ( $mysqld->{'pid'} eq $ret_pid )
{
mtr_verbose("$mysqld->{'type'} $mysqld->{'idx'} exited, pid: $ret_pid");
$mysqld->{'pid'}= 0;
# Check if crash expected, and restart if it was
my $expect_file= "$::opt_vardir/tmp/" . "$mysqld->{'type'}" . "$mysqld->{'idx'}" . ".expect"; while ( 1 )
{ if ( -f $expect_file )
{
mtr_verbose("Crash was expected, file $expect_file exists");
my $expect_file_handler;
open($expect_file_handler, "<$expect_file") or die;
my @expect_lines= <$expect_file_handler>;
close $expect_file_handler; # look at most recent order by the test
my $expect_content= pop @expect_lines;
chomp $expect_content; if ( $expect_content =~ /^wait/ )
{
mtr_verbose("Test asks that we wait before restart"); # Millisceond sleep emulated with select
select(undef, undef, undef, (0.1));
next;
}
unlink($expect_file);
mysqld_start($mysqld, $mysqld->{'start_opts'},
$mysqld->{'start_slave_master_info'});
}
last;
}
return;
}
}
mtr_warning("check_expected_crash_and_restart couldn't find an entry for pid: $ret_pid");
}
############################################################################## # # The operating system will keep information about dead children, # we read this information here, and if we have records the process # is alive, we mark it as dead. # ##############################################################################
sub mtr_record_dead_children () {
my $process_died= 0;
my $ret_pid;
# Wait without blocking to see if any processes had died # -1 or 0 means there are no more processes to wait for while ( ($ret_pid= waitpid(-1,&WNOHANG)) != 0 and $ret_pid != -1)
{
mtr_warning("mtr_record_dead_children: $ret_pid");
mark_process_dead($ret_pid);
$process_died= 1;
}
return $process_died;
}
sub start_reap_all { # This causes terminating processes to not become zombies, avoiding # the need for (or possibility of) explicit waitpid().
$SIG{CHLD}= 'IGNORE';
# On some platforms (Linux, QNX, OSX, ...) there is potential race # here. If a process terminated before setting $SIG{CHLD} (but after # any attempt to waitpid() it), it will still be a zombie. So we # have to handle any such process here.
my $pid; while(($pid= waitpid(-1, &WNOHANG)) != 0 and $pid != -1)
{
mtr_warning("start_reap_all pid: $pid");
mark_process_dead($pid);
};
}
sub stop_reap_all {
$SIG{CHLD}= 'DEFAULT';
}
sub mtr_ping_port ($) {
my $port= shift;
mtr_verbose("mtr_ping_port: $port");
my $remote= "localhost";
my $iaddr= inet_aton($remote); if ( ! $iaddr )
{
mtr_error("can't find IP number for $remote");
}
my $paddr= sockaddr_in($port, $iaddr);
my $proto= getprotobyname('tcp'); if ( ! socket(SOCK, PF_INET, SOCK_STREAM, $proto) )
{
mtr_error("can't create socket: $!");
}
############################################################################## # # Wait for a file to be created # ##############################################################################
# FIXME check that the pidfile contains the expected pid!
sub sleep_until_file_created ($$$) {
my $pidfile= shift;
my $timeout= shift;
my $pid= shift;
my $sleeptime= 100; # Milliseconds
my $loops= ($timeout * 1000) / $sleeptime;
for ( my $loop= 1; $loop <= $loops; $loop++ )
{ if ( -r $pidfile )
{
return 1;
}
# Check if it died after the fork() was successful if ( $pid != 0 && waitpid($pid,&WNOHANG) == $pid )
{
mtr_warning("Process $pid died");
return 0;
}
mtr_debug("Sleep $sleeptime milliseconds waiting for $pidfile");
# Print extra message every 60 seconds
my $seconds= ($loop * $sleeptime) / 1000; if ( $seconds > 1 and int($seconds * 10) % 600 == 0 )
{
my $left= $timeout - $seconds;
mtr_warning("Waited $seconds seconds for $pidfile to be created, " . "still waiting for $left seconds...");
}
if ($pid <= 0)
{
mtr_warning("Trying to kill illegal pid: $pid");
next;
}
my $signaled_procs= kill(9, $pid); if ($signaled_procs == 0)
{ # No such process existed, assume it's killed
mtr_verbose("killed $pid(no such process)");
} else
{
my $ret_pid= waitpid($pid,0); if ($ret_pid == $pid)
{
mtr_verbose("killed $pid(got the pid)");
}
elsif ($ret_pid == -1)
{
mtr_verbose("killed $pid(got -1)");
}
}
}
mtr_verbose("done killing processes");
}
############################################################################## # # When we exit, we kill off all children # ##############################################################################
sub mtr_exit ($) {
my $code= shift;
mtr_timer_stop_all($::glob_timers);
local $SIG{HUP} = 'IGNORE'; # ToDo: Signalling -$$ will only work if we are the process group # leader (in fact on QNX it will signal our session group leader, # which might be Do-compile or Pushbuild, causing tests to be # aborted). So we only do it if we are the group leader. We might # set ourselves as the group leader at startup (with # POSIX::setpgrp(0,0)), but then care must be needed to always do # proper child process cleanup.
POSIX::kill(SIGHUP, -$$) if !$::glob_win32_perl and $$ == getpgrp();
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