linux下exit函数详解,exit()函数 Unix/Linux

最新推荐文章于 2024-08-01 19:55:17 发布

转载最新推荐文章于 2024-08-01 19:55:17 发布 · 473 阅读

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_exit 和 _Exit 函数用于立即终止调用进程。它们关闭进程的所有打开文件描述符，并将状态值 status 作为退出状态返回给父进程。这两个函数不返回，并且不调用 atexit 或 on_exit 注册的函数。是否刷新标准 I/O 缓冲区取决于实现。

_exit, _Exit - 终止当前进程

内容简介

#include void _exit(int status);

#include void _Exit(int status);

描述

The function _exit() terminates the calling process "immediately". Any open file descriptors belonging to the process are closed; any children of the process are inherited by process 1, init, and the process’s parent is sent a SIGCHLD signal.

The value status is returned to the parent process as the process’s exit status, and can be collected using one of the wait() family of calls.

The function _Exit() is equivalent to _exit().

返回值

These functions do not return.

遵循于

SVr4, POSIX.1-2001, 4.3BSD. The function _Exit() was introduced by C99.

注意

For a discussion on the effects of an exit, the transmission of exit status, zombie processes, signals sent, etc., see exit(3).

The function _exit() is like exit(), but does not call any functions registered with atexit() or on_exit(). Whether it flushes standard I/O buffers and removes temporary files created with tmpfile(3) is implementation dependent. On the other hand, _exit() does close open file descriptors, and this may cause an unknown delay, waiting for pending output to finish. If the delay is undesired, it may be useful to call functions like tcflush() before calling _exit(). Whether any pending I/O is cancelled, and which pending I/O may be cancelled upon _exit(), is implementation-dependent.

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