XXII. Direct IO Functions
简介
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