~drizzle-trunk/drizzle/development

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
# -*- 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);
}

###########################################################################

1;