--- /dev/null
+dnl $Id$
+
+dnl Copyright (C) 2004 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
+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; version 2 of the License.
+dnl
+dnl This program is distributed in the hope that it will be useful,
+dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+dnl GNU General Public License for more details.
+dnl
+dnl You should have received a copy of the GNU General Public License
+dnl along with this program; if not, write to the Free Software
+dnl Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+dnl Usage: ENSC_SYSCALL
+
+AC_DEFUN([ENSC_SYSCALL],
+[
+ AC_REQUIRE([ENSC_KERNEL_HEADERS])
+ AC_MSG_CHECKING([for syscall(2) invocation method])
+ AC_ARG_WITH([syscall],
+ [AC_HELP_STRING([--with-syscall=METHOD],
+ [call syscall(2) with the specified METHOD; valid values are 'fast', 'traditional' and 'auto' (default: auto)])],
+ [],
+ [with_syscall=auto])
+ AC_MSG_RESULT([$with_syscall])
+
+ case x"$with_syscall" in
+ xauto)
+ AC_CACHE_CHECK([which syscall(2) invocation works], [ensc_cv_test_syscall],
+ [
+ old_CPPFLAGS=$CPPFLAGS
+ CPPFLAGS="-I$ensc_cv_path_kernelheaders"
+ AC_LANG_PUSH(C)
+ AC_COMPILE_IFELSE([
+#include <asm/unistd.h>
+#include <syscall.h>
+#include <errno.h>
+#define __NR_foo0 300
+#define __NR_foo1 301
+#define __NR_foo2 302
+#define __NR_foo3 303
+#define __NR_foo4 304
+#define __NR_foo5 305
+inline static _syscall0(int, foo0)
+inline static _syscall1(int, foo1, int, a)
+inline static _syscall2(int, foo2, int, a, int, b)
+inline static _syscall3(int, foo3, int, a, int, b, int, c)
+inline static _syscall4(int, foo4, int, a, int, b, int, c, int, d)
+inline static _syscall5(int, foo5, int, a, int, b, int, c, int, d, int, e)
+
+int main() {
+ return foo0() || \
+ foo1(1) || \
+ foo2(1,2) || \
+ foo3(1,2,3) || \
+ foo4(1,2,3,4) || \
+ foo5(1,2,3,4,5);
+}
+ ],
+ [ensc_cv_test_syscall=fast],
+ [ensc_cv_test_syscall=traditional])
+
+ AC_LANG_POP
+ CPPFLAGS=$old_CPPFLAGS
+ ])
+ with_syscall=$ensc_cv_test_syscall
+ ;;
+ xfast|xtraditional)
+ ;;
+ *)
+ AC_MSG_ERROR(['$with_syscall' is not a valid value for '--with-syscall'])
+ ;;
+ esac
+
+ if test x"$with_syscall" = xtraditional; then
+ AC_DEFINE(ENSC_SYSCALL_TRADITIONAL, 1, [Define to 1 when the fast syscall(2) invocation does not work])
+ fi
+
+ AH_BOTTOM([
+#if defined(__pic__) && defined(__i386) && !defined(ENSC_SYSCALL_TRADITIONAL)
+# define ENSC_SYSCALL_TRADITIONAL 1
+#endif])
+])