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dnl @synopsis AX_FUNC_SYSCALL
dnl
dnl This macro will find out how to call syscall. One or more of the following
dnl defines will be made as appropriate:
dnl HAVE_UNISTD_H - If unistd.h is available
dnl HAVE_SYS_SYSCALL_H - If sys/syscall.h is available
dnl HAVE_SYSCALL - If syscall() is available and is defined in unistd.h
dnl HAVE___SYSCALL - If __syscall() is available and is defined in unistd.h
dnl HAVE___SYSCALL_NEED_DEFN - If __syscall() is available but is not defined in unistd.h
dnl
dnl @category C
dnl @author Martin Ebourne
dnl @version 2005/07/01
dnl @license AllPermissive
AC_DEFUN([AX_FUNC_SYSCALL], [
AC_CHECK_HEADERS([sys/syscall.h unistd.h])
AC_CHECK_FUNCS([syscall __syscall])
if test "x$ac_cv_func_syscall" != "xyes" &&
test "x$ac_cv_func___syscall" != "xyes"; then
AC_CACHE_CHECK([for __syscall needing definition], [have___syscall_need_defn],
[AC_RUN_IFELSE([AC_LANG_PROGRAM([[
$ac_includes_default
#ifdef HAVE_SYS_SYSCALL_H
#include <sys/syscall.h>
#endif
extern "C" off_t __syscall(quad_t number, ...);
]], [[
__syscall(SYS_exit, 0);
return 1;
]])],
[have___syscall_need_defn=yes], [have___syscall_need_defn=no]
)])
if test "x$have___syscall_need_defn" = "xyes"; then
AC_DEFINE([HAVE___SYSCALL_NEED_DEFN], 1,
[Define to 1 if __syscall is available but needs a definition])
fi
fi
])dnl
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