ioctl(2)                                                 ioctl(2)



     NAME
          ioctl - control device

     SYNOPSIS
          int ioctl(fildes, request, arg)
          int fildes, request;

     DESCRIPTION
          ioctl performs a variety of functions on character special
          files (devices).  Section 7 of the A/UX System
          Administrator's Reference describes the ioctl requests that
          apply to the given device.

     RETURN VALUE
          If an error has occurred, a value of -1 is returned and
          errno is set to indicate the error.

     ERRORS
          ioctl will fail if one or more of the following are true:

          [EBADF]      fildes is not a valid open file descriptor.

          [ENOTTY]     fildes is not associated with a character spe-
                       cial device.

          [EINVAL]     request or arg is not valid.  See Section 7 of
                       the A/UX System Administrator's Reference.

          [EINTR]      A signal was caught during the ioctl system
                       call.

     SEE ALSO
          intro(2), fcntl(2), intro(7).  termio(7).






















     April, 1990                                                     1