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# XXXIII. File Alteration Monitor Functions

# 简介

FAM monitors files and directories, notifying interested applications of changes. More information about FAM is available at http://oss.sgi.com/projects/fam/.

A PHP script may specify a list of files for FAM to monitor using the functions provided by this extension.

The FAM process is started when the first connection from any application to it is opened. It exits after all connections to it have been closed.

> 注: 本扩展已被移动到 PECL 库中且自以下版本起不再被绑定到 PHP 中：5.1.0.

> 注: 本扩展模块在 Windows 平台下不可用。

# 需求

This extension uses the functions of the FAM library, developed by SGI. Therefore you have to download and install the FAM library.

# 安装

To use PHP's FAM support you must compile PHP --with-fam[=DIR] where DIR is the location of the directory containing the lib and include directories.

# 运行时配置

本扩展模块在 `php.ini` 中未定义任何配置选项。

# 资源类型

## FAM resource

# 预定义常量

以下常量由本扩展模块定义，因此只有在本扩展模块被编译到 PHP 中，或者在运行时被动态加载后才有效。

表格 1. FAM event constants

Constant | Description
--- | ---
`FAMChanged` (integer) | Some value which can be obtained with fstat(1) changed for a file or directory.
`FAMDeleted` (integer) | A file or directory was deleted or renamed.
`FAMStartExecuting` (integer) | An executable file started executing.
`FAMStopExecuting` (integer) | An executable file that was running finished.
`FAMCreated` (integer) | A file was created in a directory.
`FAMMoved` (integer) | This event never occurs.
`FAMAcknowledge` (integer) | An event in response to fam_cancel_monitor().
`FAMExists` (integer) | An event upon request to monitor a file or directory. When a directory is monitored, an event for that directory and every file contained in that directory is issued.
`FAMEndExist` (integer) | Event after the last FAMEExists event.

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read_exif_data | 上一级 | fam_cancel_monitor