多进程的HTTP 服务器要链接哪个库？

nwpu_ghost

有一段代码(HTTP Server)，编译时出现这种错误，是不是少了库啊？
信息：
webserv.c:23: warning: incompatible implicit declaration of built-in function ‘exit’
webserv.c:26: warning: incompatible implicit declaration of built-in function ‘exit’
webserv.c: In function ‘do_ls’:
webserv.c:163: warning: incompatible implicit declaration of built-in function ‘execlp’
webserv.c:165: warning: incompatible implicit declaration of built-in function ‘exit’
webserv.c: In function ‘do_exec’:
webserv.c:197: warning: incompatible implicit declaration of built-in function ‘execl’
webserv.c: In function ‘do_cat’:
webserv.c:232: warning: incompatible implicit declaration of built-in function ‘exit’

jasonwyatking

看看你的exit函数先
你就这点信息好象还不能说明什么吧

nwpu_ghost

那个exit()是怎么回事啊？