# Module mod_cgid

This module provides for execution of CGI scripts using an external CGI daemon.

Status: Base (unix threaded MPMs only)
Source File: mod_cgid.c
Module Identifier: cgid_module

## Summary

On certain unix operating systems, forking a process from a multi-threaded server is a very expensive operation because the new process will replicate all the threads of the parent process. In order to avoid incurring this expense on each CGI invocation, mod_cgid creates an external daemon that is responsible for forking child processes to run CGI scripts. The main server communicates with this daemon using a unix domain socket.

This module is used by default whenever a multi-threaded MPM is selected during the compilation process. At the user level, this module is identical in configuration and operation to mod_cgi. The only exception is the additional directive `ScriptSock` which gives the name of the socket to use for communication with the cgi daemon.

## Directives

- ScriptLog
- ScriptLogLength
- ScriptLogBuffer
- ScriptSock

### ScriptSock directive

Syntax: Scriptsock filename
Default: logs/cgisock
Context: server config
Status: Base
Module: mod_cgid

This directive sets the name of the socket to use for communication with the CGI daemon. The socket will be opened using the permissions of the user who starts Apache (usually root). To maintain the security of communications with CGI scripts, it is important that no other user has permission to write in the directory where the socket is located.