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dnl @synopsis AX_CHECK_SYSCALL_LSEEK([ACTION-IF-TRUE], [ACTION-IF-FALSE])
dnl
dnl This macro will find out if the lseek syscall requires a dummy middle
dnl parameter
dnl
dnl The following defines will be set as appropriate:
dnl HAVE_LSEEK_DUMMY_PARAM
dnl Also ACTION-IF-TRUE and ACTION-IF-FALSE are run as appropriate
dnl
dnl @category C
dnl @author Martin Ebourne
dnl @version 2005/07/03
dnl @license AllPermissive
AC_DEFUN([AX_CHECK_SYSCALL_LSEEK], [
AC_REQUIRE([AX_FUNC_SYSCALL])dnl
if test "x$ac_cv_header_sys_syscall_h" = "xyes"; then
AC_CACHE_CHECK([[whether syscall lseek requires dummy parameter]], [have_lseek_dummy_param],
[AC_RUN_IFELSE(
[AC_LANG_PROGRAM([[
$ac_includes_default
#include <fcntl.h>
#include <sys/syscall.h>
#ifdef HAVE___SYSCALL_NEED_DEFN
extern "C" off_t __syscall(quad_t number, ...);
#endif
#ifndef HAVE_SYSCALL
#undef syscall
#define syscall __syscall
#endif
]], [[
int fh = creat("lseektest", 0600);
int res = 0;
if(fh>=0)
{
res = syscall(SYS_lseek, fh, 0, SEEK_SET, 99);
close(fh);
}
unlink("lseektest");
return res!=-1;
]])],
[have_lseek_dummy_param=yes], [have_lseek_dummy_param=no]
)])
if test "x$have_lseek_dummy_param" = "xyes"; then
AC_DEFINE([HAVE_LSEEK_DUMMY_PARAM], 1,
[Define to 1 if syscall lseek requires a dummy middle parameter])
fi
fi
if test "x$have_lseek_dummy_param" = "xno"
then
m4_ifvaln([$1],[$1],[:])dnl
m4_ifvaln([$2],[else $2])dnl
fi
])dnl
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