exit(2) [bsd man page]

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)

EXIT(2) 						      BSD System Calls Manual							   EXIT(2)

NAME

     _exit -- terminate the calling process

SYNOPSIS

     #include <unistd.h>

     void
     _exit(int status);

DESCRIPTION

     The _exit() function terminates a process, with the following consequences:

     o	 All of the descriptors that were 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.

     o	 If the parent process of the calling process has an outstanding wait call or catches the SIGCHLD signal, it is notified of the calling
	 process's termination; the status is set as defined by wait(2).

     o	 The parent process-ID of all of the calling process's existing child processes are set to 1; the initialization process (see the DEFINI-
	 TIONS section of intro(2)) inherits each of these processes.

     o	 If the termination of the process causes any process group to become orphaned (usually because the parents of all members of the group
	 have now exited; see ``orphaned process group'' in intro(2)), and if any member of the orphaned group is stopped, the SIGHUP signal and
	 the SIGCONT signal are sent to all members of the newly-orphaned process group.

     o	 If the process is a controlling process (see intro(2)), the SIGHUP signal is sent to the foreground process group of the controlling ter-
	 minal.  All current access to the controlling terminal is revoked.

     Most C programs call the library routine exit(3), which flushes buffers, closes streams, unlinks temporary files, etc., before calling
     _exit().

RETURN VALUE

     _exit() can never return.

SEE ALSO

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

STANDARDS

     The _exit function is defined by IEEE Std 1003.1-1988 (``POSIX.1'').

4th Berkeley Distribution					   June 4, 1993 					 4th Berkeley Distribution