getmyinode
We also had this challenge in our company to prevent a php script in a cron job from overlapping each other.
We made this solution
<?php
// Initialize variables
$found = 0;
$file = basename(__FILE__);
$commands = array();
// Get running processes.
exec("ps w", $commands);
// If processes are found
if (count($commands) > 0) {
foreach ($commands as $command) {
if (strpos($command, $file) === false) {
// Do nothin'
}
else {
// Let's count how many times the file is found.
$found++;
}
}
}
// If the instance of the file is found more than once.
if ($found > 1) {
echo "Another process is running.\n";
die();
}
/**
*
* Regular process here...
*
*/
?>
getmypid
(PHP 4, PHP 5)
getmypid — Obtém o ID do processo PHP
Descrição
int getmypid
( void
)
Obtém o ID do atual processo do PHP.
Valor Retornado
Retorna o ID do processo PHP, ou FALSE em caso de erro.
Notas
Aviso
ID de processo não é único, então são uma fonte de entropia fraca. Nós recomendamos não usas o pid em contextos dependentes de segurança.
Veja Também
- getmygid() - Obtém o GID do dono do script PHP
- getmyuid() - Obtém o UID do dono do script PHP
- get_current_user() - Obtém o nome do dono do script PHP atual
- getmyinode() - Obtém o inode do script atual
- getlastmod() - Obtém o tempo da última modificação na pagina
add a note
User Contributed Notesgetmypid
Erickson Reyes ercbluemonday at yahoo dot com
10-Nov-2009 11:01
10-Nov-2009 11:01
Kevin Traas (ktraas- at -gmail dot com)
25-Sep-2009 06:51
25-Sep-2009 06:51
Looking to create a lock-file mechanism for a cmd-line script?
Enjoy!
#!/usr/bin/php
<?php
define( 'LOCK_FILE', "/var/run/".basename( $argv[0], ".php" ).".lock" );
if( isLocked() ) die( "Already running.\n" );
# The rest of your script goes here....
echo "Hello world!\n";
sleep(30);
unlink( LOCK_FILE );
exit(0);
function isLocked()
{
# If lock file exists, check if stale. If exists and is not stale, return TRUE
# Else, create lock file and return FALSE.
if( file_exists( LOCK_FILE ) )
{
# check if it's stale
$lockingPID = trim( file_get_contents( LOCK_FILE ) );
# Get all active PIDs.
$pids = explode( "\n", trim( `ps -e | awk '{print $1}'` ) );
# If PID is still active, return true
if( in_array( $lockingPID, $pids ) ) return true;
# Lock-file is stale, so kill it. Then move on to re-creating it.
echo "Removing stale lock file.\n";
unlink( LOCK_FILE );
}
file_put_contents( LOCK_FILE, getmypid() . "\n" );
return false;
}
?>
kroczu at interia dot pl
19-Dec-2005 10:59
19-Dec-2005 10:59
<?php
/*
mixed getpidinfo(mixed pid [, string system_ps_command_options])
this function gets PID-info from system ps command and return it in useful assoc-array,
or return false and trigger warning if PID doesn't exists
$pidifo=getpidinfo(12345);
print_r($pidifo);
Array
(
[USER] => user
[PID] => 12345
[%CPU] => 0.0
[%MEM] => 0.0
[VSZ] => 1720
[RSS] => 8
[TT] => ??
[STAT] => Is
[STARTED] => 6:00PM
[TIME] => 0:00.01
[COMMAND] => php someproces.php > logfile
)
*/
//////////////////////////////////////////////
function getpidinfo($pid, $ps_opt="aux"){
$ps=shell_exec("ps ".$ps_opt."p ".$pid);
$ps=explode("\n", $ps);
if(count($ps)<2){
trigger_error("PID ".$pid." doesn't exists", E_USER_WARNING);
return false;
}
foreach($ps as $key=>$val){
$ps[$key]=explode(" ", ereg_replace(" +", " ", trim($ps[$key])));
}
foreach($ps[0] as $key=>$val){
$pidinfo[$val] = $ps[1][$key];
unset($ps[1][$key]);
}
if(is_array($ps[1])){
$pidinfo[$val].=" ".implode(" ", $ps[1]);
}
return $pidinfo;
}
?>
Pure-PHP
21-Mar-2005 08:26
21-Mar-2005 08:26
You can use this function also to avoid more than one instance of your app.
You can also use this class.
http://www.pure-php.de/node/20
Usage:
<?php
inlude("ProcessHandler.class.php");
if(ProcessHandler::isActive()){
die("Already running!\n";);
}else{
ProcessHandler::activate();
//run my app
}
?>
brooke at jump dot net
24-Oct-2003 10:49
24-Oct-2003 10:49
One good use for this is deciding on a concurrency-safe temporary file or directory name. You can be assured that no two processes on the same server have the same PID, so this is enough to avoid collisions. For example:
<?php
$tmpfile = "/tmp/foo_".getmypid();
// Use $tmpfile...
// Use $tmpfile...
// Use $tmpfile...
unlink ($tmpfile);
?>
If you are sharing /tmp over the network (which is odd....) then you can, of course, mix in the PHP server's IP address.