2 dnl Copyright (C) 2011 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_READ],
9 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
10 dnl This ifdef is just an optimization, to avoid performing a configure
11 dnl check whose result is not used. It does not make the test of
12 dnl GNULIB_UNISTD_H_NONBLOCKING or GNULIB_NONBLOCKING redundant.
13 m4_ifdef([gl_NONBLOCKING_IO], [
15 if test $gl_cv_have_nonblocking != yes; then