EXIT(2-SVR4)        RISC/os Reference Manual         EXIT(2-SVR4)



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 mes-
          sage 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 SA_NOCLDWAIT 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 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)].



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EXIT(2-SVR4)        RISC/os Reference Manual         EXIT(2-SVR4)



          If the process is a controlling process, SIGHUP is sent
          to the foreground process group of its controlling ter-
          minal 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 pro-
          cess group that will be orphaned when the calling pro-
          cess 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 func-
     tions and cleanup.

     The symbols EXIT_SUCCESS and EXIT_FAILURE 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), sig-
     nal(2), times(2), wait(2), atexit(3C).

NOTES
     See signal(2) NOTES.





























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