c++ - exit(EXIT_FAILURE)做了什么？

Question

exit(EXIT_TRUE)，做了这些：

1. Objects associated with the current thread with thread storage duration are destroyed (C++11 only).

2. Objects with static storage duration are destroyed (C++) and functions registered with atexit are called.

3. All C streams (open with functions in <cstdio>) are closed (and flushed, if buffered), and all files created with tmpfile are removed.
Control is returned to the host environment.

那exit(EXIT_FAILURE)呢？

Answer 1

EXIT_SUCCESS和EXIT_FAILURE是两个常量。一般EXIT_SUCCESS=0，EXIT_FAILURE=1。

exit()函数先处理完上面你列出的许多后事，最后将它的参数返回给操作系统作为exit status。所以从exit函数本身执行来说并没有什么不同。不同的是操作系统对这个exit status的解释。一般0表示程序寿终正寝，1表示死于非命。