_exit, _Exit - 终止当前进程
内容简介
#includevoid _exit(int status) #include void _Exit(int status)
描述
The function%uA0_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,%uA0init, and the process’s parent is sent a%uA0SIGCHLD%uA0signal.
The value%uA0status%uA0is returned to the parent process as the process’s exit status, and can be collected using one of the%uA0wait() family of calls.
The function%uA0_Exit() is equivalent to%uA0_exit().
返回值
These functions do not return.%uA0
遵循于
SVr4, POSIX.1-2001, 4.3BSD. The function%uA0_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%uA0exit(3).
The function%uA0_exit() is like%uA0exit(), but does not call any functions registered with%uA0atexit() or%uA0on_exit(). Whether it flushes standard I/O buffers and removes temporary files created with%uA0tmpfile(3) is implementation dependent. On the other hand,%uA0_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%uA0tcflush() before calling%uA0_exit(). Whether any pending I/O is cancelled, and which pending I/O may be cancelled upon%uA0_exit(), is implementation-dependent.