XXII. Direct IO Functions

介绍

PHP supports the direct io functions as described in the Posix Standard (Section 6) for performing I/O functions at a lower level than the C-Language stream I/O functions (fopen(), fread(),..). The use of the DIO functions should be considered only when direct control of a device is needed. In all other cases, the standard filesystem functions are more than adequate.

注: 该扩展模块不适用于 Windows 平台！

需求

无需外部库文件就可以加入本扩展模块的支持。

安装

To get these functions to work, you have to configure PHP with --enable-dio.

运行时配置

该扩展模块未定义任何设置指令。

资源类型

One resource type is defined by this extension: a file descriptor returned by dio_open().

预定义常量

该扩展模块未定义任何常量。

目录
dio_close -- Closes the file descriptor given by fd
dio_fcntl -- Performs a c library fcntl on fd
dio_open -- Opens a new filename with specified permissions of flags and creation permissions of mode
dio_read -- Reads n bytes from fd and returns them, if n is not specified, reads 1k block
dio_seek -- Seeks to pos on fd from whence
dio_stat -- Gets stat information about the file descriptor fd
dio_tcsetattr -- Sets terminal attributes and baud rate for a serial port
dio_truncate -- Truncates file descriptor fd to offset bytes
dio_write -- Writes data to fd with optional truncation at length