四incompatible implicit‘exit’解决man（三）

ywx@yuweixian:~/yu/professional/4$ gcc pthread_exit.c -lpthread -o pthread_exit
pthread_exit.c: In function ‘main’:
pthread_exit.c:22: warning: incompatible implicit declaration of built-in function ‘exit’
pthread_exit.c:28: warning: incompatible implicit declaration of built-in function ‘free’
pthread_exit.c: In function ‘helloworld’:
pthread_exit.c:35: warning: incompatible implicit declaration of built-in function ‘malloc’
pthread_exit.c:37: warning: format ‘%p’ expects type ‘void *’, but argument 2 has type ‘pthread_t’
pthread_exit.c:38: warning: incompatible implicit declaration of built-in function ‘memset’

当我们遇到上面的问题比如：
 pthread_exit.c:22: warning: incompatible implicit declaration of built-in function ‘exit’

警告：不兼容得 隐式声明的 内置函数 “exit”

这说明没有 exit 这个 头文件，，我们需要加上响应的头文件

这里有一种很方便的方法：

    man  exit   就可看到需要的头文件 我们加上就可以了
 
   #include

ywx@yuweixian:~/yu/professional/4$ man exit


EXIT(3)                    Linux Programmer's Manual                   EXIT(3)

NAME
       exit - cause normal process termination

SYNOPSIS
       #include <stdlib.h>

       void exit(int status);

DESCRIPTION
       The  exit() function causes normal process termination and the value of
       status & 0377 is returned to the parent (see wait(2)).

       All functions registered with atexit(3) and on_exit(3) are  called,  in
       the