2 dnl Copyright (C) 2007 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
7 AC_DEFUN([gl_FUNC_LSEEK],
9 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
10 AC_REQUIRE([AC_PROG_CC])
11 AC_CACHE_CHECK([whether lseek detects pipes], [gl_cv_func_lseek_pipe],
12 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <unistd.h>],
13 [#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
14 /* mingw mistakenly returns 0 when trying to seek on pipes. */
17 [gl_cv_func_lseek_pipe=yes], [gl_cv_func_lseek_pipe=no])])
18 if test $gl_cv_func_lseek_pipe = no; then
23 AC_DEFUN([gl_REPLACE_LSEEK],
26 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
28 AC_DEFINE([LSEEK_PIPE_BROKEN], [1],
29 [Define to 1 if lseek does not detect pipes.])