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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_struct_semun.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_STRUCT_SEMUN
#
# DESCRIPTION
#
# This macro checks to see if sys/sem.h defines struct semun. Some systems
# do, some systems don't. Your code must be able to deal with this
# possibility; if HAVE_STRUCT_SEMUM isn't defined for a given system, you
# have to define this structure before you can call functions like
# semctl().
#
# You should call AX_SYSV_IPC before this macro, to separate the check for
# System V IPC headers from the check for struct semun.
#
# LICENSE
#
# Copyright (c) 2008 Warren Young <warren@etr-usa.com>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 9
AU_ALIAS([ETR_STRUCT_SEMUN], [AX_STRUCT_SEMUN])
AC_DEFUN([AX_STRUCT_SEMUN],
[
AC_CACHE_CHECK([for struct semun], ac_cv_struct_semun, [
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>
]],
[[struct semun s;]])],
[ac_cv_struct_semun=yes],
[ac_cv_struct_semun=no])
])
if test x"$ac_cv_struct_semun" = "xyes"
then
AC_DEFINE(HAVE_STRUCT_SEMUN, 1,
[ Define if your system's sys/sem.h file defines struct semun ])
fi
]) dnl AX_STRUCT_SEMUN
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