guile/m4/accept4.m4

# accept4.m4 serial 3
dnl Copyright (C) 2009-2023 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

AC_DEFUN([gl_FUNC_ACCEPT4],
[
  AC_REQUIRE([gl_SYS_SOCKET_H_DEFAULTS])

  dnl Persuade glibc <sys/socket.h> to declare accept4().
  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])

  AC_CHECK_DECLS([accept4], , , [[
#include <sys/types.h>
#include <sys/socket.h>
]])
  if test $ac_cv_have_decl_accept4 != yes; then
    HAVE_ACCEPT4=0
  fi
])