bsd man page for exit

EXIT(2) 							System Calls Manual							   EXIT(2)

NAME
       _exit - terminate a process

SYNOPSIS
       _exit(status)
       int status;

DESCRIPTION
       _exit terminates a process with the following consequences:

       All of the descriptors open in the calling process are closed.  This may entail delays, for example, waiting for output to drain; a process
       in this state may not be killed, as it is already dying.

       If the parent process of the calling process is executing a wait or is interested in the SIGCHLD signal, then it is notified of the calling
       process's termination and the low-order eight bits of status are made available to it; see wait(2).

       The  parent  process  ID  of  all  of the calling process's existing child processes are also set to 1.	This means that the initialization
       process (see intro(2)) inherits each of these processes as well.  Any stopped children are restarted with a hangup signal (SIGHUP).

       Most C programs call the library routine exit(3), which performs cleanup actions in the standard I/O library before calling _exit.

RETURN VALUE
       This call never returns.

SEE ALSO
       fork(2), sigvec(2), wait(2), exit(3)

4th Berkeley Distribution					   May 22, 1986 							   EXIT(2)