# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
# vim: set filetype=python:
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.


@template
def check_clock_monotonic_support(lib=None, when=None):
    check_msg = "for clock_gettime(CLOCK_MONOTONIC)"
    flags = []

    if lib is not None:
        check_msg += f" in {lib}"
        flags.append(f"-l{lib}")

    check_when = building_with_gnu_cc
    if when is not None:
        check_when &= when

    return try_link(
        includes=["time.h"],
        body="struct timespec ts; clock_gettime(CLOCK_MONOTONIC, &ts);",
        check_msg=check_msg,
        flags=flags,
        when=check_when,
    )


have_raw_clock_monotonic_support = check_clock_monotonic_support()
have_rt_clock_monotonic_support = check_clock_monotonic_support(
    lib="rt", when=~have_raw_clock_monotonic_support
)

set_define(
    "HAVE_CLOCK_MONOTONIC",
    have_raw_clock_monotonic_support | have_rt_clock_monotonic_support,
)
set_config(
    "HAVE_CLOCK_MONOTONIC",
    have_raw_clock_monotonic_support | have_rt_clock_monotonic_support,
)

set_config("REALTIME_LIBS", ["-lrt"], when=have_rt_clock_monotonic_support)


have_res_ninit = try_link(
    includes=["sys/types.h", "netinet/in.h", "arpa/nameser.h", "resolv.h"],
    body="int foo = res_ninit(&_res);",
    check_msg="for res_ninit()",
    flags=depends(when=building_linux)(["-D_BSD_SOURCE=1"]),
    when=building_with_gnu_cc & ~target_is_netbsd & ~target_is_openbsd,
)

set_define("HAVE_RES_NINIT", have_res_ninit)