posix_getpgid

(PHP 4, PHP 5)

posix_getpgid — Get process group id for job control

Описание

int posix_getpgid ( int $pid )

Returns the process group identifier of the process pid .

Список параметров

pid

The process id.

Возвращаемые значения

Returns the identifier, as an integer.

Примеры

Пример #1 Example use of posix_getpgid()

<?php
$pid 
posix_getppid();
echo 
posix_getpgid($pid); //35
?>

Примечания

Замечание: This is a not POSIX function, but is common on BSD and System V systems. If the system does not support this function, then it will not be included at compile time. This may be checked with function_exists().

Смотрите также

Коментарии

Автор:
This function and posix_getsid can be used to check if a process is alive (since they return FALSE if the process can not be found)

So if you have a PID in a lock file, and you want to know if that process is still running- you can use this code:

$lockfile = sys_get_temp_dir() . '/myScript.lock';
$pid = file_get_contents($lockfile);
if (posix_getsid($pid) === false) {
   print "process has died! restarting...\n";
   file_put_contents($lockfile, getmypid()); // create lockfile
} else {
   print "PID is still alive! can not run twice!\n";
   exit;
}

:-) perfect if you need to make sure a cron job or shell script has ended before it can be started again.
2011-05-04 01:46:48
http://php5.kiev.ua/manual/ru/function.posix-getpgid.html

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