exit(2)                                                   exit(2)



     NAME
          exit, _exit - terminate process

     SYNOPSIS
          void exit (status)
          int status; void exit (status)
          int status;

     DESCRIPTION
          exit terminates the calling process with the following
          consequences: All of the file descriptors open in the
          calling process are closed.  If the parent process of the
          calling process is executing a wait, it is notified of the
          calling process's termination and the low order eight bits
          (i.e., bits 0377) of status are made available to it; see
          wait(2).  If the parent process of the calling process is
          not executing a wait, 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 times.  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 ID, tty group ID, and process group ID of the
          calling process are equal, the SIGHUP signal is sent to each
          process that has a process group ID equal to that of the
          calling process.

          The C function exit may cause cleanup actions before the
          process exits.  The function exit circumvents all cleanup.

     SEE ALSO
          acct(2), intro(2), plock(2), semop(2), signal(3), wait(2).

     WARNING
          See WARNING section in signal(3).







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