c-linux's Introduction
进程终止的两种方式: 1、异常终止 对一信号的接受而引发,默认动作为终止当前进程 可能产生核心转储 abort() 异步终止 2、正常终止 _exit(status)指定了进程的终止状态 父进程可调用wait()获取该状态 0表示“功成身退” 非0表示因异常而退出 不要大于128 信号终止时 $? 信号值与128相加 一般不使用_exit()退出 exit()会在子函数中提前结束进程 通常都用exit结束进程 exit()执行动作如下: a、调用退出处理程序(通过atexit()和on_exit()函数) 执行顺序与注册顺序相反 b、刷新标准输入输出(stdio)缓冲区 c、使用status的值执行_exit()系统调用 调用main()的运行时函数(runtime)会将return n的返回值作为exit()的参数
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