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dio_open

(PHP 4 >= 4.2.0, PECL)

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

说明

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

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

参数

filename

The opened file.

flags

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.

mode

If flags is O_CREAT, mode will set the mode of the file (creation permissions).

  • 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.

返回值

A file descriptor or FALSE on error.

例

例子 1. Setting the baud rate on a serial port

<?php

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

dio_close($fd);
?>

参见

dio_close()

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