dnl Simple macro to find the type of the ioctl request parameter
dnl Copyright (c) 2007 xine project
dnl
dnl This program is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU General Public License as published by
dnl the Free Software Foundation; either version 2, or (at your option)
dnl any later version.
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dnl This program is distributed in the hope that it will be useful,
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dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
dnl GNU General Public License for more details.
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dnl along with this program; if not, write to the Free Software
dnl Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
dnl 02110-1301, USA.
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dnl macro gives unlimited permission to copy, distribute and modify the
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dnl Usage AC_IOCTL_REQUEST
AC_DEFUN([AC_IOCTL_REQUEST], [
  AC_CACHE_CHECK([type of request parameter for ioctl()],
    ac_cv_ioctl_request,
    [for ac_ioctl_request_type in "unsigned long" "int"
     do
       AC_LINK_IFELSE([AC_LANG_PROGRAM([[
        #include <sys/ioctl.h>
        int ioctl(int fd, $ac_ioctl_request_type request, ...);
       ]], [[]])],[ac_cv_ioctl_request=$ac_ioctl_request_type],[])
     done])

  if test "x$ac_cv_ioctl_request" = "x"; then
    AC_MSG_ERROR([Unable to determine the type for ioctl() request parameter])
  fi

  AC_DEFINE_UNQUOTED([IOCTL_REQUEST_TYPE], $ac_cv_ioctl_request, [Type of the request parameter for ioctl()])
])
