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Digg  pcntl_exec
Executes specified program in current process space
(PHP 4 >= 4.2.0, PHP 5)
Code Examples / Notes » pcntl_execeric kilfoil
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. agodong
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. michael dot ferre
//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 ;) |
