exit(2)                          UNIX System V                          exit(2)


NAME
      exit, exit - terminate process

SYNOPSIS
      #include <stdlib.h>

      void exit(int status);

      #include <unistd.h>

      void exit(int status);

DESCRIPTION
      exit terminates the calling process with 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 has not specified the
            SANOCLDWAIT flag [see sigaction(2)], the calling process is
            transformed into a ``zombie process.''  A zombie process is a
            process that only occupies a slot in the process table.  It has no
            other space allocated either in user or kernel space.  The process
            table slot that it occupies is partially overlaid with time
            accounting information [see <sys/proc.h>] to be used by the times
            system call.

            The parent process ID of all of the calling process's existing
            child processes  and zombie processes is set to 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.

            If the process has a process, text, or data lock, an unlock is
            performed [see plock(2)].

            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.



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exit(2)                          UNIX System V                          exit(2)


            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), plock(2), semop(2), sigaction(2), signal(2), times(2),
      wait(2), atexit(3C).

NOTES
      See signal(2) NOTES.


































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