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posix_mkfifo — Create a FIFO special file (POSIX.1, 5.4.2)


string posix_mkfifo(pathname, permissions);
string pathname: Pathname of FIFO file to create
int permissions: Permissions mode to create file with


TRUE on success and FALSE on error.


This function is used to create a named pipe (FIFO, for 'First In First Out'). The name of the created special file is given in pathname ; it must refer to a location where PHP has permission to create files. The permissions parameter specifies the permissions to give to the created file; the permissions on the FIFO are then based on this value and 0666 - umask (where umask is the current umask setting).


PHP 3.0.13+, PHP 4.0b4+


Example 1083. Creating a named pipe (FIFO)

$fifo = '/tmp/testfifo';
if (file_exists($fifo) || $login = posix_mkfifo($fifo, 0666)) {
    echo "Testing FIFO:\n";
    $result = `cat < $fifo & echo "Hi there" > $fifo`;
    echo "Got back '$result'\n";
} else {
    echo "Could not create FIFO.\n";

PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at The authors of this book have elected not to choose any options under the OPL. This online book was obtained from and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.

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