exit(2)                   DG/UX 4.30                    exit(2)



     NAME
          _exit - Terminate a process.

     SYNOPSIS
          void _exit (status)
          int status;

     DESCRIPTION
          The exit() function shall terminate the calling process
          with the following consequences:

               (1) All open file descriptors and directory streams in
               the calling process are closed.

               (2) If the parent process of the calling process is
               executing a wait() or waitpid(), it is notified of the
               calling process's termination and the low order 8 bits
               of status() are made available to it; see wait(2).

               (3) If the parent process of the calling process is not
               executing a wait() or waitpid() function, the exit
               status() code is saved for return to the parent process
               whenever the parent process executes an appropriate
               subsequent wait() or waitpid().

               (4) Termination of a process does not directly
               terminate its children.  The sending of a SIGHUP signal
               as described below indirectly terminates children in
               some circumstances.  Children of a terminated process
               shall be assigned a new parent process ID,
               corresponding to an implementation-defined system
               process.

               (5) If the implementation supports the SIGCHLD signal,
               a SIGCHLD signal shall be sent to the parent process.

               (6) If the process is a controlling process, the SIGHUP
               signal shall be sent to each process in the foreground
               process group of the controlling terminal belonging to
               the calling process.

               (7) If the process is a controlling process, the
               controlling terminal associated with the session is
               disassociated from the session, allowing it to be
               acquired by a new controlling process.

               (8) If the implementation supports job control, and if
               the exit of the process causes a process group to
               become orphaned, and if any member of the newly-
               orphaned process group is stopped, then a SIGHUP signal
               followed by a SIGCONT signal shall be sent to each
               process in the newly-orphaned process group.



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     exit(2)                   DG/UX 4.30                    exit(2)



          These consequences shall occur on process termination for
          any reason.

     RETURNS
          The exit() function cannot return to its caller.

     SEE ALSO
          close(2), sigaction(2), wait(2)

     COPYRIGHTS
          Portions of this text are reprinted from IEEE Std 1003.1-
          1988, Portable Operating System Interface for Computer
          Environment, copyright © 1988 by the Institute of Electrical
          and Electronics Engineers, Inc., with the permission of the
          IEEE Standards Department.  To purchase IEEE Standards, call
          800/678-IEEE.

          In the event of a discrepancy between the electronic and the
          original printed version, the original version takes
          precedence.

     STANDARDS
          Both the SIGCHLD signal and job control are supported by the
          implementation.

          Note that the closing of all file descriptors opened in the
          calling process means that all file locks held by the
          process will be released.

          The calling process's working and root directories are
          released.

          Until the calling process's parent acknowledges the
          termination using wait() or waitpid(), the terminating
          process's PID is not available for reuse, and the process
          still counts against per-user and system-wide limits on the
          number of processes.

          A SIGCHLD signal shall be sent to the parent of the
          terminating process.  If the parent is ignoring SIGCHLD, the
          child's system-wide resources will be freed anyway during
          the parent's next system-call (when the parent processes
          signals).

          All of the terminating process's existing children and
          unacknowledged terminated children have their parent process
          set to be PID 1, the root of the process tree.

          Any child processes that were being traced are terminated by
          sending them the signal SIGKILL.

          If the process is a child created by vfork(), all shared



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     exit(2)                   DG/UX 4.30                    exit(2)



          memory segments are returned to its parent.  Otherwise, each
          attached shared memory segment is detached.

          For each semaphore for which the calling process has set a
          semaphore adjust value (see semop()), that value is added to
          the value of the specified semaphore.

          If the process has a text or data lock, an unlock is
          performed (see plock()).  However, if the process is a child
          created by vfork(), these locks are returned to its parent
          along with the rest of the address space.

          All interval timers are discarded.

          An accounting record is written on the accounting file if
          the system's accounting routine is enabled; see acct().







































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