exit(2)                        DG/UX R4.11MU05                       exit(2)


NAME
       exit, exit - terminate process

SYNOPSIS
       #include <stdlib.h>

       void exit(int status);

       #include <unistd.h>

       void exit(int status);

   where:
       status  An integer indicating the status to be returned

DESCRIPTION
       The functions exit() and exit() terminate the calling process.  The
       function exit() can cause additional processing to be done before the
       process exits [see atexit(3C) and fclose(3S)].

       In addition, termination will have the following consequences:

              All of the file descriptors, directory streams and message
              catalogue descriptors open in the calling process are closed.

              A SIGCHLD signal is sent to the calling process's parent
              process.

              If the parent process of the calling process is executing
              either wait(), waitpid(), or waitid() see [wait(2), waitpid(),
              waitid()],and has not set its SANOCLDWAIT flag [see
              sigaction(2)], it is notified of the calling process'
              termination, the calling process' status is made available to
              it, and the lifetime of the calling process ends.

              If the calling process' parent process is not executing either
              wait(), waitpid(), or waitid(), and has not set its
              SANOCLDWAIT flag, the calling process is transformed into a
              zombie process.  The status of the child process will be
              available to the parent process when the parent process
              subsequently executes a wait function.  At that time, the
              lifetime of the calling process will end.

              If the parent process of the calling process has set its
              SANOCLDWAIT flag, the status will be discarded, and the
              lifetime of the calling process will end immediately.

              The parent process ID of all of the calling process' child
              processes is set to the process ID of a the initialization
              process, which has a process ID of 1.  This means the
              initialization process [see intro(2)] inherits each of these
              processes.

              Each attached shared memory segment is detached and the value
              of shmnattach in the data structure associated with its
              shared memory identifier is decremented by 1.

              For each semaphore for which the calling process has set a
              semadj value [see semop(2)], that semadj value is added to the
              semval of the specified semaphore.

              An accounting record is written on the accounting file if the
              system's accounting routine is enabled [see acct(2)].

              If the process is a controlling process, SIGHUP is sent to the
              foreground process group of its controlling terminal and its
              controlling terminal is deallocated.

              If the calling process has any stopped children whose process
              group will be orphaned when the calling process exits, or if
              the calling process is a member of a process group that will
              be orphaned when the calling process exits, that process group
              will be sent SIGHUP and SIGCONT signals.

       The C function exit(3C) calls any functions registered through the
       atexit function in the reverse order of their registration.  The
       function exit circumvents all such functions and cleanup.

       The symbols EXITSUCCESS and EXITFAILURE are defined in stdlib.h and
       may be used as the value of status to indicate successful or
       unsuccessful termination, respectively.

SEE ALSO
       acct(2), intro(2), semop(2), sigaction(2), signal(2), times(2),
       wait(2), atexit(3C).

NOTES
       See signal(2).


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