EXIT(2)                   FreeBSD System Calls Manual                  EXIT(2)

NAME
     _exit - terminate the calling process

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <unistd.h>

     void
     _exit(int status);

DESCRIPTION
     The _exit() system call 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 has an outstanding
         wait(2) call or catches the SIGCHLD signal, it is notified of the
         calling process's termination and the status is set as defined by
         wait(2).

     •   The parent process-ID of all of the calling process's existing child
         processes are set to the process-ID of the calling process's reaper;
         the reaper (normally the initialization process) inherits each of
         these processes (see procctl(2), init(8) and the DEFINITIONS section
         of intro(2)).

     •   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.

     •   If the process is a controlling process (see intro(2)), the SIGHUP
         signal is sent to the foreground process group of the controlling
         terminal, and 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 VALUES
     The _exit() system call can never return.

SEE ALSO
     fork(2), sigaction(2), wait(2), exit(3), init(8)

STANDARDS
     The _exit() system call is expected to conform to IEEE Std 1003.1-1990
     ("POSIX.1").

HISTORY
     The _exit() function appeared in Version 7 AT&T UNIX.

FreeBSD 13.1-RELEASE-p6        September 8, 2016       FreeBSD 13.1-RELEASE-p6