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# dio_open

(PHP 4 >= 4.2.0, PHP 5)

dio_open -- Opens a new filename with specified permissions of flags and creation permissions of mode

## Description

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

dio_open() opens a file and returns a new file descriptor for it, or `FALSE` if any error occurred. If flags is O_CREAT, the optional third parameter mode will set the mode of the file (creation permissions). The flags parameter can be one of the following options:

- O_RDONLY - opens the file for read access.

- O_WRONLY - opens the file for write access.

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

The flags parameter can also include any combination of the following flags:

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

- O_EXCL - if both, O_CREAT and O_EXCL are set, dio_open() fails, if the file already exists.

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

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

- O_NONBLOCK - sets non blocking mode.

See also: dio_close().

Exemplo 1. Setting the baud rate on a serial port
`<?php $fd = dio_open('/dev/ttyS0', O_RDWR | O_NOCTTY | O_NONBLOCK); dio_close($fd); ?>`

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