pcntl_exec

(PHP 4 >= 4.2.0, PHP 5)

pcntl_exec — Ejecuta un programa específico en el espacio de proceso actual

Descripción

bool pcntl_exec ( string $ruta [, array $args [, array $envs ]] )

pcntl_exec() ejecuta el programa path con los argumentos args . path debe ser un binario ejecutable o un script apuntando a un ejecutable con la ruta correcta en la primera línea (por ejemplo #!/usr/local/bin/perl). Para más información mira la página del man execve(2) en tu sistema.

args debe ser una matriz con los argumentos que se le pasan al programa.

envs debe ser una matriz de cadenas de texto en la cual se pasan variables de entorno al programa. La matriz debe tener el formato indice => contenido, el indice seráa el nombre de la variable de entorno y el contenido será el valor de la variable.

pcntl_exec() devuelve FALSE en errores.

pcntl_fork

pcntl_alarm

Last updated: Fri, 22 Aug 2008

add a note User Contributed Notes
pcntl_exec

fahadsadah at gmail dot com dot please dot remove dot this
28-Jun-2008 07:44


Just a note regarding what rbemrose at vgmusic dot com said:

Once the executed process ends, control returns to the webserver process.

rbemrose at vgmusic dot com
06-Feb-2008 02:44


As a side note, if I'm reading the comments below correctly, you should not run this if you're using a PHP webserver module, as it will replace the webserver's process with whatever process you're telling it to run.

agodong at verizon dot net
07-Dec-2006 10:47


Some people might find it useful to run other program using the same process as a different user. This is very usefull if the script is running under root. Here is a simple code to achieve that under *nix PHP CLI:



#!/usr/bin/php -q

<?php

//Enter run-as user below (argument needed to be passed when the script is called), otherwise it will run as the caller user process.



$username = $_SERVER['argv'][1];



$user = posix_getpwnam($username);

posix_setuid($user['uid']);

posix_setgid($user['gid']);

pcntl_exec('/path/to/cmd');

?>



I use this as a part of socket program so that a program can be run under different user from remote location.

eric kilfoil
24-Oct-2006 10:01


The pcntl_exec() function works exactly like the standard (unix-style) exec() function.  It differs from the regular PHP exec() function in that the process calling the pcntl_exec() is replaced with the process that gets called.  This is the ideal method for creating children.  In a simple example (that does no error checking):



switch (pcntl_fork()) {

  case 0:

    $cmd = "/path/to/command";

    $args = array("arg1", "arg2");

    pcntl_exec($cmd, $args);

    // the child will only reach this point on exec failure,

    // because execution shifts to the pcntl_exec()ed command

    exit(0);

  default:

    break;

}



// parent continues

echo "I am the parent";



--



since this is not being executed through a shell, you must provide the exact path from the filesystem root.  Look at the execve() man page for more information.

michael dot ferre at mobileway dot com
20-Nov-2002 03:28


//To complete my last note

//If you use some object in your php code 

//You will have some problem if you do a exit after include the

//child scripts

//You must use posix_kill() like that :



$CHILD_PID = pcntl_fork();

if($CHILD_PID == 0)

{    

  include ($script_path);

  posix_kill(getmypid(),9);

}



//This code is very simple it can be ameliorate ;)

michael dot ferre at mobileway dot com
19-Nov-2002 04:19


//If you are in php version between 4.1 and 4.2

//When you use pcntl_fork and after you want use

//pcntl_exec, you can because pcntl_exec isn't used before

//php 4.2 so let me show a solution :



$CHILD_PID = pcntl_fork();

if($CHILD_PID == 0)

{    

   include ($script_path);

   exit;

}



//$script_path is the  *.php page which you want lauch like

// a child .



//I don't know why php coder hadn't add  pcntl_exec in the

//same time that other function



//Micha�l F. php developer .

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pcntl_fork

pcntl_alarm

Last updated: Fri, 22 Aug 2008