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_EXIT(2) System Calls Manual _EXIT(2)

_exit, _Exit
terminate the calling process

#include <unistd.h>
_exit(int status);
#include <stdlib.h>
_Exit(int status);

The _exit() and _Exit() functions terminate a process with the following consequences:
Most C programs call the library routine exit(3), which flushes buffers, closes streams, unlinks temporary files, etc., and then calls _exit().

_exit() and _Exit() can never return.

fork(2), intro(2), sigaction(2), wait(2), exit(3), sysexits(3)

The _exit() function conform to IEEE Std 1003.1-2008 (“POSIX.1”). The _Exit() function conforms to ISO/IEC 9899:1999 (“ISO C99”).

An exit() system call first appeared in Version 1 AT&T UNIX. It accepts the status argument since Version 2 AT&T UNIX. An _exit() variant first appeared in Version 7 AT&T UNIX. The _Exit() function appeared in OpenBSD 3.6.
September 10, 2015 OpenBSD-current