exit(2P)         INTERACTIVE UNIX System (POSIX)         exit(2P)



          NAME
               exit, _exit - terminate process

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

          DESCRIPTION
               The exit system call 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 or waitpid, 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 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 will be sent to each process in the newly-orphaned
               process group.

               If the parent process of the calling process is not execut-
               ing 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 processes'
               existing child processes and zombie processes is set to 1.
               This means the initialization process (see intro(2)) inher-
               its each of these processes.

               Each attached shared memory segment is detached and the
               value of shm_nattach 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)).


          Rev. 1.1                                                   Page 1

          exit(2P)         INTERACTIVE UNIX System (POSIX)         exit(2P)



               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.

               A death of child signal is sent to the parent.

               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(2), sigset(2),
               wait(2).

          DIAGNOSTICS
               None.  There can be no return from an exit system call.







































          Rev. 1.1                                                   Page 2