2 dnl Copyright (C) 2009-2018 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_ACCEPT4],
9 AC_REQUIRE([gl_SYS_SOCKET_H_DEFAULTS])
11 dnl Persuade glibc <sys/socket.h> to declare accept4().
12 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
14 AC_CHECK_FUNCS_ONCE([accept4])
15 if test $ac_cv_func_accept4 != yes; then