DragonFly On-Line Manual Pages

EXIT(2)                  DragonFly 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() function terminates a process with the following conse-
     quences:

     *   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 1; the initialization process (see the
         DEFINITIONS section of intro(2)) inherits each of these processes.

     *   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
     _exit() can never return.

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

STANDARDS
     The _exit() function call is expected to conform to ISO/IEC 9945-1:1990
     (``POSIX.1'').

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

DragonFly 3.5                    June 4, 1993                    DragonFly 3.5