Fix: build and tests on `FreeBSD 13.2`

Currently main branch does not compile on FreeBSD 13.2

build log

```➜ quinn git:(main) cargo build Compiling quinn-proto v0.10.0 (/usr/home/maksimv/quinn/quinn-proto) Compiling quinn-udp v0.4.0 (/usr/home/maksimv/quinn/quinn-udp) Compiling clap v3.2.25 Compiling serde v1.0.162 error[E0425]: cannot find value `SYS_sendmmsg` in crate `libc` --> quinn-udp/src/unix.rs:319:35 | 319 | let ret = libc::syscall(libc::SYS_sendmmsg, sockfd, msgvec, vlen, flags) as libc::c_int; | ^^^^^^^^^^^^ help: a function with a similar name exists: `sendmmsg` | ::: /home/maksimv/.cargo/registry/src/github.com-1ecc6299db9ec823/libc-0.2.142/src/unix/bsd/freebsdlike/freebsd/mod.rs:5162:5 | 5162 | / pub fn sendmmsg( 5163 | | sockfd: ::c_int, 5164 | | msgvec: *mut ::mmsghdr, 5165 | | vlen: ::size_t, 5166 | | flags: ::c_int, 5167 | | ) -> ::ssize_t; | |__________________- similarly named function `sendmmsg` defined here error[E0425]: cannot find value `SYS_recvmmsg` in crate `libc` --> quinn-udp/src/unix.rs:432:29 | 432 | libc::syscall(libc::SYS_recvmmsg, sockfd, msgvec, vlen, flags, timeout) as libc::c_int; | ^^^^^^^^^^^^ help: a function with a similar name exists: `recvmmsg` | ::: /home/maksimv/.cargo/registry/src/github.com-1ecc6299db9ec823/libc-0.2.142/src/unix/bsd/freebsdlike/freebsd/mod.rs:5168:5 | 5168 | / pub fn recvmmsg( 5169 | | sockfd: ::c_int, 5170 | | msgvec: *mut ::mmsghdr, 5171 | | vlen: ::size_t, 5172 | | flags: ::c_int, 5173 | | timeout: *const ::timespec, 5174 | | ) -> ::ssize_t; | |__________________- similarly named function `recvmmsg` defined here error[E0308]: mismatched types --> quinn-udp/src/unix.rs:352:29 | 352 | (*msgvec).msg_len = n as libc::c_uint; | ----------------- ^^^^^^^^^^^^^^^^^ expected `isize`, found `u32` | | | expected due to the type of this binding error[E0308]: mismatched types --> quinn-udp/src/unix.rs:465:29 | 465 | (*msgvec).msg_len = n as libc::c_uint; | ----------------- ^^^^^^^^^^^^^^^^^ expected `isize`, found `u32` | | | expected due to the type of this binding Some errors have detailed explanations: E0308, E0425. For more information about an error, try `rustc --explain E0308`. error: could not compile `quinn-udp` due to 4 previous errors warning: build failed, waiting for other jobs to finish... ```

Looks like FreeBSD implements recvmmsg and sendmmsg as high-level abstractions over recvmsg and sendmsg and not as direct system calls.

This Pull Requests resolves issue by calling recvmmsg/sendmmsg directly if target_os = "freebsd"

build and test log

``` ➜ quinn git:(build-and-tests-freebsd-13.2) cargo build Compiling quinn-udp v0.4.0 (/usr/home/maksimv/quinn/quinn-udp) Compiling serde_json v1.0.96 Compiling quinn v0.10.0 (/usr/home/maksimv/quinn/quinn) Compiling perf v0.1.0 (/usr/home/maksimv/quinn/perf) Compiling bench v0.1.0 (/usr/home/maksimv/quinn/bench) Finished dev [unoptimized + debuginfo] target(s) in 3.07s ➜ quinn git:(build-and-tests-freebsd-13.2) cargo test Compiling pin-project-internal v1.0.12 Compiling unicode-normalization v0.1.22 Compiling percent-encoding v2.2.0 Compiling unicode-bidi v0.3.13 Compiling dirs-sys-next v0.1.2 Compiling crc-catalog v2.2.0 Compiling bencher v0.1.5 Compiling hex-literal v0.4.1 Compiling assert_matches v1.5.0 Compiling bench v0.1.0 (/usr/home/maksimv/quinn/bench) Compiling perf v0.1.0 (/usr/home/maksimv/quinn/perf) Compiling crc v3.0.1 Compiling quinn-proto v0.10.0 (/usr/home/maksimv/quinn/quinn-proto) Compiling form_urlencoded v1.1.0 Compiling directories-next v2.0.0 Compiling quinn-udp v0.4.0 (/usr/home/maksimv/quinn/quinn-udp) Compiling idna v0.3.0 Compiling url v2.3.1 Compiling pin-project v1.0.12 Compiling tracing-futures v0.2.5 Compiling quinn v0.10.0 (/usr/home/maksimv/quinn/quinn) Finished test [unoptimized + debuginfo] target(s) in 6.74s Running unittests src/lib.rs (target/debug/deps/bench-ceeeb7873258cb39) running 0 tests test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s Running unittests src/bin/bulk.rs (target/debug/deps/bulk-0be315f4c5d52962) running 0 tests test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s Running unittests src/lib.rs (target/debug/deps/perf-287db6662727b10d) running 0 tests test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s Running unittests src/bin/perf_client.rs (target/debug/deps/perf_client-66fee0e3732847de) running 0 tests test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s Running unittests src/bin/perf_server.rs (target/debug/deps/perf_server-3f22b6c9cef581ba) running 0 tests test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s Running unittests src/lib.rs (target/debug/deps/quinn-df0c7e4127e9d912) running 16 tests test tests::local_addr ... ok test tests::close_endpoint ... ok test tests::export_keying_material ... ok test tests::stream_id_flow_control ... ok test work_limiter::tests::limit_work ... ok test tests::rebind_recv ... ok test tests::two_datagram_readers ... ok test tests::echo_v4 ... ok test tests::echo_v6 ... ok test tests::zero_rtt ... ok test tests::accept_after_close ... ok test tests::read_after_close ... ok test tests::handshake_timeout ... ok test tests::stress_stream_receive_window ... ok test tests::stress_receive_window ... ok test tests::stress_both_windows ... ok test result: ok. 16 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 17.28s Running tests/many_connections.rs (target/debug/deps/many_connections-eb299f32f11e8ded) running 1 test test connect_n_nodes_to_1_and_send_1mb_data ... ignored test result: ok. 0 passed; 0 failed; 1 ignored; 0 measured; 0 filtered out; finished in 0.00s Running unittests src/lib.rs (target/debug/deps/quinn_proto-a984d5bd60ce9091) running 190 tests test cid_queue::tests::always_valid ... ok test cid_queue::tests::insert_duplicate ... ok test cid_queue::tests::next_dense ... ok test cid_queue::tests::insert_retired ... ok test cid_queue::tests::retire_many ... ok test cid_queue::tests::insert_limit ... ok test cid_queue::tests::retire_sparse ... ok test cid_queue::tests::next_sparse ... ok test cid_queue::tests::retire_then_insert_next ... ok test cid_queue::tests::retire_dense ... ok test cid_queue::tests::wrap ... ok test congestion::bbr::min_max::test::test ... ok test connection::assembler::test::assemble_complex ... ok test connection::assembler::test::assemble_contained ... ok test connection::assembler::test::assemble_complex_compact ... ok test connection::assembler::test::assemble_contained_compact ... ok test connection::assembler::test::assemble_contains ... ok test connection::assembler::test::assemble_contains_compact ... ok test connection::assembler::test::assemble_duplicate ... ok test connection::assembler::test::assemble_duplicate_compact ... ok test connection::assembler::test::assemble_ordered ... ok test connection::assembler::test::assemble_overlapping ... ok test connection::assembler::test::chunks_dedup ... ok test connection::assembler::test::assemble_overlapping_compact ... ok test connection::assembler::test::assemble_old ... ok test connection::assembler::test::compact ... ok test connection::assembler::test::defrag_read_chunk ... ok test connection::assembler::test::unordered_happy_path ... ok test connection::assembler::test::ordered_insert_unordered_read ... ok test connection::mtud::tests::black_hole_detector_ignores_burst_containing_non_suspicious_packet ... ok test connection::assembler::test::assemble_unordered ... ok test connection::mtud::tests::black_hole_detector_ignores_empty_burst ... ok test connection::mtud::tests::black_hole_detector_counts_burst_containing_only_suspicious_packets ... ok test connection::mtud::tests::mtu_discovery_disabled_does_nothing ... ok test connection::assembler::test::ordered_eager_discard ... ok test connection::mtud::tests::mtu_discovery_lost_half_of_probes_finds_maximum_udp_payload ... ok test connection::mtud::tests::mtu_discovery_after_complete_reactivates_when_interval_elapsed ... ok test connection::mtud::tests::mtu_discovery_disabled_lost_four_packet_bursts_triggers_black_hole_detection ... ok test connection::mtud::tests::mtu_discovery_lost_four_packet_bursts_triggers_black_hole_detection_and_resets_timer ... ok test connection::assembler::test::defrag_with_missing_prefix ... ok test connection::assembler::test::unordered_dedup ... ok test connection::mtud::tests::mtu_discovery_lost_three_probes_lowers_probe_size ... ok test connection::mtud::tests::mtu_discovery_no_lost_probes_finds_maximum_udp_payload ... ok test connection::mtud::tests::mtu_discovery_with_1500_limit_and_10000_upper_bound ... ok test connection::mtud::tests::mtu_discovery_with_1500_limit ... ok test connection::mtud::tests::mtu_discovery_lost_two_packet_bursts_does_not_trigger_black_hole_detection ... ok test connection::mtud::tests::mtu_discovery_with_previous_peer_max_udp_payload_size_clamps_upper_bound ... ok test connection::mtud::tests::mtu_discovery_with_peer_max_udp_payload_size_clamps_upper_bound ... ok test connection::mtud::tests::search_state_lower_bound_higher_than_peer_max_udp_payload_size_clamps_lower_bound ... ok test connection::mtud::tests::search_state_lower_bound_higher_than_upper_bound_clamps_upper_bound ... ok test connection::mtud::tests::search_state_upper_bound_higher_than_peer_max_udp_payload_size_clamps_upper_bound ... ok test connection::pacing::tests::adjusts_capacity ... ok test connection::mtud::tests::mtu_discovery_with_peer_max_udp_payload_size_after_search_panics - should panic ... ok test connection::pacing::tests::does_not_panic_on_bad_instant ... ok test connection::pacing::tests::derives_initial_capacity ... ok test connection::pacing::tests::computes_pause_correctly ... ok test connection::send_buffer::tests::retransmit ... ok test connection::send_buffer::tests::fragment_with_length ... ok test connection::send_buffer::tests::ack ... ok test connection::send_buffer::tests::reordered_ack ... ok test connection::send_buffer::tests::fragment_without_length ... ok test connection::spaces::test::sanity ... ok test connection::spaces::test::jump ... ok test connection::send_buffer::tests::multiple_segments ... ok test connection::spaces::test::sent_packet_size ... ok test connection::streams::send::tests::byte_slice ... ok test connection::streams::send::tests::bytes_array ... ok test connection::send_buffer::tests::reserves_encoded_offset ... ok test connection::streams::state::tests::expand_receive_window ... ok test connection::spaces::test::happypath ... ok test connection::streams::state::tests::final_offset_flow_control ... ok test connection::streams::state::tests::send_stopped ... ok test connection::streams::state::tests::remote_stream_capacity ... ok test connection::streams::state::tests::reset_stream_cannot_send ... ok test connection::streams::state::tests::requeue_stream_priority ... ok test connection::streams::state::tests::stopped_reset ... ok test connection::streams::state::tests::recv_stopped ... ok test connection::streams::state::tests::stop_finished ... ok test connection::streams::state::tests::reset_flow_control ... ok test connection::streams::state::tests::stream_limit_fixed ... ok test connection::streams::state::tests::stream_limit_grows ... ok test connection::streams::state::tests::reset_after_empty_frame_flow_control ... ok test frame::test::ack_coding ... ok test connection::streams::state::tests::stream_priority ... ok test connection::streams::state::tests::duplicate_reset_flow_control ... ok test connection::streams::state::tests::trivial_flow_control ... ok test packet::tests::pn_encode ... ok test packet::tests::roundtrip_packet_numbers ... ok test packet::tests::header_encoding ... ok test range_set::btree_range_set::tests::replace_contained ... ok test range_set::btree_range_set::tests::replace_exact_pred ... ok test connection::streams::state::tests::shrink_receive_window ... ok test range_set::btree_range_set::tests::replace_contains ... ok test connection::streams::state::tests::stream_limit_shrinks ... ok test range_set::tests::array_range_set::double_merge_wide ... ok test range_set::btree_range_set::tests::replace_pred ... ok test range_set::btree_range_set::tests::replace_exact_succ ... ok test range_set::btree_range_set::tests::replace_succ ... ok test range_set::tests::array_range_set::double_remove ... ok test range_set::tests::array_range_set::insert_multiple ... ok test range_set::tests::array_range_set::double_insert ... ok test range_set::tests::array_range_set::double_merge_exact ... ok test range_set::tests::array_range_set::single_merge_low ... ok test range_set::tests::array_range_set::remove_multiple ... ok test range_set::tests::array_range_set::skip_empty_ranges ... ok test range_set::tests::array_range_set::single_merge_high ... ok test range_set::tests::range_set::double_insert ... ok test range_set::tests::array_range_set::merge_and_split ... ok test range_set::tests::range_set::double_merge_wide ... ok test range_set::tests::range_set::double_merge_exact ... ok test range_set::tests::range_set::double_remove ... ok test range_set::tests::range_set::single_merge_high ... ok test range_set::tests::range_set::insert_multiple ... ok test range_set::tests::range_set::merge_and_split ... ok test range_set::tests::range_set::remove_multiple ... ok test range_set::tests::range_set::single_merge_low ... ok test range_set::tests::range_set::skip_empty_ranges ... ok test tests::client_alpn_unset ... ok test tests::alpn_mismatch ... ok test tests::concurrent_connections_full ... ok test tests::alpn_success ... ok test packet::tests::pn_expand_roundtrip ... ok test tests::blackhole_after_mtu_change_repairs_itself ... ok test tests::conn_flow_control ... ok test tests::client_stateless_reset ... ok test tests::congested_tail_loss ... ok test tests::connect_too_low_mtu ... ok test tests::cid_retirement ... ok test range_set::tests::array_range_set::compare_insert_to_reference ... ok test tests::cid_rotation ... ok test tests::connect_runs_mtud_again_after_600_seconds ... ok test tests::congestion ... ok test tests::datagram_recv_buffer_overflow ... ok test tests::connection_close_sends_acks ... ok test tests::datagram_unsupported ... ok test tests::connect_lost_mtu_probes_do_not_trigger_congestion_control ... ok test range_set::tests::range_set::compare_insert_to_reference ... ok test tests::export_keying_material ... ok test tests::handshake_anti_deadlock_probe ... ok test tests::datagram_send_recv ... ok test range_set::tests::array_range_set::compare_remove_to_reference ... ok test tests::draft_version_compat ... ok test tests::connect_detects_mtu ... ok test tests::finish_stream_flow_control_reordered ... ok test tests::instant_close_1 ... ok test tests::finish_retransmit ... ok test tests::finish_stream_simple ... ok test tests::instant_close_2 ... ok test tests::idle_timeout ... ok test tests::malformed_token_len ... ok test tests::finish_acked ... ok test tests::large_initial ... ok test tests::handshake_1rtt_handling ... ok test tests::high_latency_handshake ... ok test tests::key_update_simple ... ok test tests::implicit_open ... ok test tests::initial_retransmit ... ok test tests::lifecycle ... ok test tests::key_update_reordered ... ok test tests::migrate_detects_new_mtu_and_respects_original_peer_max_udp_payload_size ... ok test tests::packet_splitting_not_necessary_after_higher_mtu_discovered ... ok test tests::reject_self_signed_server_cert ... ok test tests::server_alpn_unset ... ok test tests::packet_splitting_with_default_mtu ... ok test tests::packet_loss_and_retry_too_low_mtu ... ok test tests::reject_missing_client_cert ... ok test range_set::tests::range_set::compare_remove_to_reference ... ok test tests::repeated_request_response ... ok test tests::reset_stream ... ok test tests::server_can_send_3_inital_packets ... ok test tests::migration ... ok test tests::version_negotiate_client ... ok test tests::version_negotiate_server ... ok test tests::keep_alive ... ok test tests::stop_before_finish ... ok test token::test::invalid_token_returns_err ... ok test token::test::token_sanity ... ok test transport_parameters::test::coding ... ok test transport_parameters::test::resumption_params_validation ... ok test tests::stop_during_finish ... ok test tests::stateless_retry ... ok test tests::stream_id_limit ... ok test tests::server_hs_retransmit ... ok test tests::server_stateless_reset ... ok test tests::stop_opens_bidi ... ok test tests::stream_flow_control ... ok test tests::stop_stream ... ok test tests::zero_rtt_rejection ... ok test tests::zero_length_cid ... ok test tests::zero_rtt_happypath ... ok test result: ok. 190 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.17s Running unittests src/lib.rs (target/debug/deps/quinn_udp-6337c310b84b504d) running 0 tests test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s Doc-tests bench running 0 tests test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s Doc-tests perf running 0 tests test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s Doc-tests quinn running 1 test test src/recv_stream.rs - recv_stream::RecvStream (line 40) - compile ... ok test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.03s Doc-tests quinn-proto running 3 tests test src/config.rs - config::TransportConfig::congestion_controller_factory (line 282) ... ok test src/config.rs - config::IdleTimeout (line 843) ... ok test src/config.rs - config::TransportConfig::max_idle_timeout (line 79) ... ok test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.16s Doc-tests quinn-udp running 0 tests test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s ➜ quinn git:(build-and-tests-freebsd-13.2) uname -a Linux bsdvm 4.4.0 FreeBSD 13.2-RELEASE releng/13.2-n254617-525ecfdad597 GENERIC x86_64 x86_64 x86_64 GNU/Linux ```

quinn-rs / quinn

Fix: build and tests on `FreeBSD 13.2` #1555