php man page for dio_open

DIO_OPEN(3)								 1							       DIO_OPEN(3)

dio_open - Opens a file (creating it if necessary) at a lower level than the C library input/ouput stream functions allow.

SYNOPSIS
       resource dio_open (string  $filename, int  $flags, [int	$mode])

DESCRIPTION
       dio_open(3) opens a file and returns a new file descriptor for it.

PARAMETERS
	      o $filename
		- The pathname of the file to open.

	      o $flags
		-  The $flags parameter is a bitwise-ORed value comprising flags from the following list. This value must include one of O_RDONLY,
		O_WRONLY, or O_RDWR. Additionally, it may include any combination of the other flags from this list.

		     o O_RDONLY - opens the file for read access.

		     o O_WRONLY - opens the file for write access.

		     o O_RDWR - opens the file for both reading and writing.

		     o O_CREAT - creates the file, if it doesn't already exist.

		     o O_EXCL - if both O_CREAT and O_EXCL are set and the file already exists, dio_open(3) will fail.

		     o O_TRUNC - if the file exists and is opened for write access, the file will be truncated to zero length.

		     o O_APPEND - write operations write data at the end of the file.

		     o O_NONBLOCK - sets non blocking mode.

		     o O_NOCTTY - prevent the OS from assigning the opened file as the process's controlling terminal when opening  a  TTY  device
		       file.

	      o $mode
		-  If  $flags  contains  O_CREAT, $mode will set the permissions of the file (creation permissions). $mode is required for correct
		operation when O_CREAT is specified in $flags and is ignored otherwise.  The actual permissions assigned to the created file  will
		be affected by the process's umask setting as per usual.

RETURN VALUES
	A file descriptor or FALSE on error.

EXAMPLES
       Example #1

	      Opening a file descriptor

	      <?php

	      $fd = dio_open('/dev/ttyS0', O_RDWR | O_NOCTTY | O_NONBLOCK);

	      dio_close($fd);
	      ?>

SEE ALSO
       dio_close(3).

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