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#***************************************************************************
# _ _ ____ _
# Project ___| | | | _ \| |
# / __| | | | |_) | |
# | (__| |_| | _ <| |___
# \___|\___/|_| \_\_____|
#
# Copyright (C) 1998 - 2009, Daniel Stenberg, <daniel@haxx.se>, et al.
#
# This software is licensed as described in the file COPYING, which
# you should have received as part of this distribution. The terms
# are also available at http://curl.haxx.se/docs/copyright.html.
#
# You may opt to use, copy, modify, merge, publish, distribute and/or sell
# copies of the Software, and permit persons to whom the Software is
# furnished to do so, under the terms of the COPYING file.
#
# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
# KIND, either express or implied.
#
# $Id$
###########################################################################
#######################################################################
# pidfromfile returns the pid stored in the given pidfile. The value
# of the returned pid will never be a negative value. It will be zero
# on any file related error or if a pid can not be extracted from the
# given file.
#
sub pidfromfile {
my $pidfile = $_[0];
my $pid = 0;
if(-f $pidfile && -s $pidfile && open(PIDFH, "<$pidfile")) {
$pid = 0 + <PIDFH>;
close(PIDFH);
$pid = 0 unless($pid > 0);
}
return $pid;
}
#######################################################################
# processexists checks if a process with the pid stored in the given
# pidfile exists and is alive. This will return 0 on any file related
# error or if a pid can not be extracted from the given file. When a
# process with the same pid as the one extracted from the given file
# is currently alive this returns that positive pid. Otherwise, when
# the process is not alive, will return the negative value of the pid.
#
sub processexists {
use POSIX ":sys_wait_h";
my $pidfile = $_[0];
# fetch pid from pidfile
my $pid = pidfromfile($pidfile);
if($pid > 0) {
# verify if currently alive
if(kill(0, $pid)) {
return $pid;
}
else {
# reap it if this has not already been done
waitpid($pid, &WNOHANG);
# get rid of the certainly invalid pidfile
unlink($pidfile) if($pid == pidfromfile($pidfile));
return -$pid; # negative means dead process
}
}
return 0;
}
#######################################################################
# killpid attempts to gracefully stop processes in the given pid list
# with a SIGTERM signal and SIGKILLs those which haven't died on time.
#
sub killpid {
use POSIX ":sys_wait_h";
my ($verbose, $pidlist) = @_;
# The 'pidlist' argument is a string of whitespace separated pids.
return if(not defined $pidlist);
# For each pid which is alive send it a SIGTERM to gracefully
# stop it, otherwise reap it if this has not been done yet.
my @signalled;
my $prev = 0;
my @pids = split(' ', $pidlist);
if(scalar(@pids) > 2) {
my @sorted = sort({$a <=> $b} @pids);
@pids = @sorted;
}
foreach my $tmp (@pids) {
chomp $tmp;
if($tmp =~ /^(\d+)$/) {
my $pid = $1;
if(($pid > 0) && ($prev != $pid)) {
$prev = $pid;
if(kill(0, $pid)) {
print("RUN: Process with pid $pid signalled to die\n")
if($verbose);
kill("TERM", $pid);
push @signalled, $pid;
}
else {
print("RUN: Process with pid $pid already dead\n")
if($verbose);
waitpid($pid, &WNOHANG);
}
}
}
}
return if(not scalar(@signalled));
# Allow all signalled processes five seconds to gracefully die.
my $quarters = 20;
while($quarters--) {
for(my $i = scalar(@signalled) - 1; $i >= 0; $i--) {
my $pid = $signalled[$i];
if(!kill(0, $pid)) {
print("RUN: Process with pid $pid gracefully died\n")
if($verbose);
waitpid($pid, &WNOHANG);
splice @signalled, $i, 1;
}
}
return if(not scalar(@signalled));
select(undef, undef, undef, 0.25);
}
# Mercilessly SIGKILL processes still alive.
foreach my $pid (@signalled) {
print("RUN: Process with pid $pid forced to die with SIGKILL\n")
if($verbose);
kill("KILL", $pid);
waitpid($pid, 0);
}
}
#############################################################################
# Kill a specific slave
#
sub ftpkillslave {
my ($id, $ext, $verbose)=@_;
my $base;
my $pidlist;
my @pidfiles;
for $base (('filt', 'data')) {
my $f = ".sock$base$id$ext.pid";
my $pid = processexists($f);
if($pid > 0) {
printf ("* kill pid for %s => %d\n", "ftp-$base$id$ext", $pid)
if($verbose);
$pidlist .= "$pid ";
}
push @pidfiles, $f;
}
killpid($verbose, $pidlist);
foreach my $pidfile (@pidfiles) {
unlink($pidfile);
}
}
#############################################################################
# Make sure no FTP leftovers are still running. Kill all slave processes.
# This uses pidfiles since it might be used by other processes.
#
sub ftpkillslaves {
my ($verbose) = @_;
my $pidlist;
my @pidfiles;
for $ext (('', 'ipv6')) {
for $id (('', '2')) {
for $base (('filt', 'data')) {
my $f = ".sock$base$id$ext.pid";
my $pid = processexists($f);
if($pid > 0) {
printf ("* kill pid for %s => %d\n", "ftp-$base$id$ext",
$pid) if($verbose);
$pidlist .= "$pid ";
}
push @pidfiles, $f;
}
}
}
killpid($verbose, $pidlist);
foreach my $pidfile (@pidfiles) {
unlink($pidfile);
}
}
sub set_advisor_read_lock {
my ($filename) = @_;
if(open(FILEH, ">$filename")) {
close(FILEH);
return;
}
printf "Error creating lock file $filename error: $!";
}
sub clear_advisor_read_lock {
my ($filename) = @_;
if(-f $filename) {
unlink($filename);
}
}
1;
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