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mariadb/mysql-test/lib/mtr_process.pl
msvensson@pilot.(none) 9e55a4f3b9 Merge pilot.(none):/data/msvensson/mysql/mysql-5.0-maint 
into  pilot.(none):/data/msvensson/mysql/mysql-5.1-new-maint
2007-08-03 12:52:31 +02:00

1143 lines
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Perl
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# -*- cperl -*-
# Copyright (C) 2004-2006 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;
use POSIX qw(WNOHANG SIGHUP);
sub mtr_run ($$$$$$;$);
sub mtr_spawn ($$$$$$;$);
sub mtr_check_stop_servers ($);
sub mtr_kill_leftovers ();
sub mtr_wait_blocking ($);
sub mtr_record_dead_children ();
sub mtr_ndbmgm_start($$);
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 ($$$$$$$);
##############################################################################
#
# Execute an external command
#
##############################################################################
sub mtr_run ($$$$$$;$) {
my $path= shift;
my $arg_list_t= shift;
my $input= shift;
my $output= shift;
my $error= shift;
my $pid_file= shift; # Not used
my $spawn_opts= shift;
return spawn_impl($path,$arg_list_t,'run',$input,$output,$error,
$spawn_opts);
}
sub mtr_run_test ($$$$$$;$) {
my $path= shift;
my $arg_list_t= shift;
my $input= shift;
my $output= shift;
my $error= shift;
my $pid_file= shift; # Not used
my $spawn_opts= shift;
return spawn_impl($path,$arg_list_t,'test',$input,$output,$error,
$spawn_opts);
}
sub mtr_spawn ($$$$$$;$) {
my $path= shift;
my $arg_list_t= shift;
my $input= shift;
my $output= shift;
my $error= shift;
my $pid_file= shift; # Not used
my $spawn_opts= shift;
return spawn_impl($path,$arg_list_t,'spawn',$input,$output,$error,
$spawn_opts);
}
sub spawn_impl ($$$$$$$) {
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
# FIXME we should only give up the suite, not all of the run?
print STDERR "\n";
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(mysqld, ndbd, ndb_mgmd and im) that would conflict with
# this run
# Make sure to remove the PID file, if any.
# kill IM manager first, else it will restart the servers
sub mtr_kill_leftovers () {
mtr_report("Killing Possible Leftover Processes");
mtr_debug("mtr_kill_leftovers(): started.");
my @kill_pids;
my %admin_pids;
foreach my $srv (@{$::master}, @{$::slave})
{
mtr_debug(" - mysqld " .
"(pid: $srv->{pid}; " .
"pid file: '$srv->{path_pid}'; " .
"socket: '$srv->{path_sock}'; ".
"port: $srv->{port})");
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
}
if ( ! $::opt_skip_ndbcluster )
{
foreach my $cluster (@{$::clusters})
{
# Don't shut down a "running" cluster
next if $cluster->{'use_running'};
mtr_debug(" - cluster " .
"(pid: $cluster->{pid}; " .
"pid file: '$cluster->{path_pid})");
my $pid= mtr_ndbmgm_start($cluster, "shutdown");
# Save the pid of the ndb_mgm process
$admin_pids{$pid}= 1;
push(@kill_pids,{
pid => $cluster->{'pid'},
pidfile => $cluster->{'path_pid'}
});
$cluster->{'pid'}= 0; # Assume we are done with it
foreach my $ndbd (@{$cluster->{'ndbds'}})
{
mtr_debug(" - ndbd " .
"(pid: $ndbd->{pid}; " .
"pid file: '$ndbd->{path_pid})");
push(@kill_pids,{
pid => $ndbd->{'pid'},
pidfile => $ndbd->{'path_pid'},
});
$ndbd->{'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 let kill(0,@pids) be
# a way to just return the numer 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 cound 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.");
}
}
}
else
{
mtr_warning("Found non pid file $elem in $rundir")
if -f "$rundir/$elem";
next;
}
}
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, wai 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;
}
# Start "ndb_mgm shutdown" for a specific cluster, it will
# shutdown all data nodes and leave the ndb_mgmd running
sub mtr_ndbmgm_start($$) {
my $cluster= shift;
my $command= shift;
my $args;
mtr_init_args(\$args);
mtr_add_arg($args, "--no-defaults");
mtr_add_arg($args, "--core");
mtr_add_arg($args, "--try-reconnect=1");
mtr_add_arg($args, "--ndb_connectstring=%s", $cluster->{'connect_string'});
mtr_add_arg($args, "-e");
mtr_add_arg($args, "$command");
my $pid= mtr_spawn($::exe_ndb_mgm, $args,
"", "/dev/null", "/dev/null", "",
{});
mtr_verbose("mtr_ndbmgm_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;
foreach my $mysqld (@{$::master}, @{$::slave})
{
if ( $mysqld->{'pid'} eq $ret_pid )
{
mtr_verbose("$mysqld->{'type'} $mysqld->{'idx'} exited, pid: $ret_pid");
$mysqld->{'pid'}= 0;
return;
}
}
foreach my $cluster (@{$::clusters})
{
if ( $cluster->{'pid'} eq $ret_pid )
{
mtr_verbose("$cluster->{'name'} cluster ndb_mgmd exited, pid: $ret_pid");
$cluster->{'pid'}= 0;
return;
}
foreach my $ndbd (@{$cluster->{'ndbds'}})
{
if ( $ndbd->{'pid'} eq $ret_pid )
{
mtr_verbose("$cluster->{'name'} cluster ndbd exited, pid: $ret_pid");
$ndbd->{'pid'}= 0;
return;
}
}
}
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";
if ( -f $expect_file )
{
mtr_verbose("Crash was expected, file $expect_file exists");
mysqld_start($mysqld, $mysqld->{'start_opts'},
$mysqld->{'start_slave_master_info'});
unlink($expect_file);
}
return;
}
}
foreach my $cluster (@{$::clusters})
{
if ( $cluster->{'pid'} eq $ret_pid )
{
mtr_verbose("$cluster->{'name'} cluster ndb_mgmd exited, pid: $ret_pid");
$cluster->{'pid'}= 0;
# Check if crash expected and restart if it was
my $expect_file= "$::opt_vardir/tmp/ndb_mgmd_" . "$cluster->{'type'}" .
".expect";
if ( -f $expect_file )
{
mtr_verbose("Crash was expected, file $expect_file exists");
ndbmgmd_start($cluster);
unlink($expect_file);
}
return;
}
foreach my $ndbd (@{$cluster->{'ndbds'}})
{
if ( $ndbd->{'pid'} eq $ret_pid )
{
mtr_verbose("$cluster->{'name'} cluster ndbd exited, pid: $ret_pid");
$ndbd->{'pid'}= 0;
# Check if crash expected and restart if it was
my $expect_file= "$::opt_vardir/tmp/ndbd_" . "$cluster->{'type'}" .
"$ndbd->{'idx'}" . ".expect";
if ( -f $expect_file )
{
mtr_verbose("Crash was expected, file $expect_file exists");
ndbd_start($cluster, $ndbd->{'idx'},
$ndbd->{'start_extra_args'});
unlink($expect_file);
}
return;
}
}
}
if ($::instance_manager->{'spawner_pid'} eq $ret_pid)
{
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 blockinng to see if any processes had died
# -1 or 0 means there are no more procesess 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: $!");
}
mtr_debug("Pinging server (port: $port)...");
if ( connect(SOCK, $paddr) )
{
close(SOCK); # FIXME check error?
mtr_verbose("USED");
return 1;
}
else
{
mtr_verbose("FREE");
return 0;
}
}
##############################################################################
#
# 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 $left seconds...");
}
# Millisceond sleep emulated with select
select(undef, undef, undef, ($sleeptime/1000));
}
return 0;
}
sub mtr_kill_processes ($) {
my $pids = shift;
mtr_verbose("mtr_kill_processes (" . join(" ", keys %{$pids}) . ")");
foreach my $pid (keys %{$pids})
{
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();
exit($code);
}
###########################################################################
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