(PHP 4, PHP 5, PHP 7, PHP 8)
posix_mkfifo — Create a fifo special file (a named pipe)
$filename, int $permissions): bool
posix_mkfifo() creates a special
FIFO file which exists in the file system and acts as
a bidirectional communication endpoint for processes.
filename
Path to the FIFO file.
permissions
The second parameter permissions has to be given in
octal notation (e.g. 0644). The permission of the newly created
FIFO also depends on the setting of the current
umask(). The permissions of the created file are
(mode & ~umask).
成功时返回 true， 或者在失败时返回 false。