EXIT(2-SVR3)        RISC/os Reference Manual         EXIT(2-SVR3)



NAME
     exit, _exit - terminate process

SYNOPSIS
     #include <bsd/sys/types.h>
     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 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 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



                        Printed 11/19/92                   Page 1

EXIT(2-SVR3)        RISC/os Reference Manual         EXIT(2-SVR3)



     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).

WARNING
     See NOTE in signal(2) and WARNING in sigset(2).

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







































 Page 2                 Printed 11/19/92