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# Copyright (C) 1993-1998 Ken'ichi Fukamachi
# All rights reserved.
# 1993-1996 fukachan@phys.titech.ac.jp
# 1996-1998 fukachan@sapporo.iij.ad.jp
#
# FML is free software; you can redistribute it and/or modify
# it under the terms of GNU General Public License.
# See the file COPYING for more details.
#
# $Id$;
### Lock library functions,
### This lock functions uses proceses ID
# Lock UNIX V7 age like..
# old lock extracted from fml 0.x and revised now :-)
sub V7Lock
{
$0 = "$FML: link(2) style Locked and waiting <$LOCKFILE>";
# set variables
$LockFile = $LOCK_FILE || "$FP_VARRUN_DIR/lockfile.v7";
$LockTmp = "$FP_VARRUN_DIR/lockfile.$$";
local($timeout) = 0;
# create tmpfile
open(APP, ">> $LockTmp") || die "Can't make LOCK $LockTmp\n";
close(APP);
chown $<, $GID, $LockTmp if $GID;
&Append2(&WholeMail."[$$]", $LockTmp) if $debug;
# Timeout by alarm(3); adjust the value to 3600 sec. around.
&SetEvent(($MAX_TIMEOUT+10)*20 +60, 'TimeOut') if $HAS_ALARM;
# try within about 10min.
$LockStatus{$LockFile} = 'unlocked';
&SRand();
for ($timeout = 0; $timeout < $MAX_TIMEOUT; $timeout++) {
if (link($LockTmp, $LockFile) == 0) { # if lock fails, wait&try
$LockStatus{$LockFile} = 'unlocked';
sleep (rand(3)+5);
}
else {
$LockStatus{$LockFile} = 'locked';
last;
}
}
unlink $LockTmp;
if ($timeout >= $MAX_TIMEOUT) {
$Timeout = sprintf("TIMEOUT.%2d%02d%02d%02d%02d%02d",
1900 + $year, $mon+1, $mday, $hour, $min, $sec);
open(TIMEOUT, "> $FP_VARLOG_DIR/$Timeout");
select(TIMEOUT); $| = 1; select(STDOUT);
print TIMEOUT $Envelope{'Header'};
print TIMEOUT "\n";
print TIMEOUT $Envelope{'Body'};
close(TIMEOUT);
&WarnE("link(2) style LOCK TIMEOUT",
"saved in $FP_VARLOG_DIR/$Timeout\n\n");
sleep(3);
&TimeOut; # called when flock(2) and alarm(3) works and lock timeouts.
}
}
sub V7Unlock
{
$0 = "$FML: link(2) style Unlocked <$LOCKFILE>";
unlink $LockFile if $LockStatus{$LockFile} eq 'locked';
&Log("cannot unlink $LockFile (unlocked)") if $LockStatus{$LockFile} ne 'locked';
}
1;
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