adding tcp_info struct to linux musl/glibc.

(backport <rust-lang#3480>)
(cherry picked from commit ee0bf57)

libc-test/build.rs

@@ -4480,7 +4480,17 @@ fn test_linux(target: &str) {
         // the `ifc_ifcu` field is an anonymous union
         (struct_ == "ifconf" && field == "ifc_ifcu") ||
         // glibc uses a single array `uregs` instead of individual fields.
-        (struct_ == "user_regs" && arm)
+        (struct_ == "user_regs" && arm) ||
+        // the `ifr_ifrn` field is an anonymous union
+        (struct_ == "iwreq" && field == "ifr_ifrn") ||
+        // the `key` field is a zero-sized array
+        (struct_ == "iw_encode_ext" && field == "key") ||
+        // the `tcpi_snd_rcv_wscale` map two bitfield fields stored in a u8
+        (struct_ == "tcp_info" && field == "tcpi_snd_rcv_wscale") ||
+        // the `tcpi_delivery_rate_app_limited` field is a bitfield on musl
+        (musl && struct_ == "tcp_info" && field == "tcpi_delivery_rate_app_limited") ||
+        // the `tcpi_fast_open_client_fail` field is a bitfield on musl
+        (musl && struct_ == "tcp_info" && field == "tcpi_fast_open_client_fail")
     });
 
     cfg.skip_roundtrip(move |s| match s {

libc-test/semver/linux-gnu.txt

@@ -712,3 +712,4 @@ putgrent
 execveat
 close_range
 epoll_pwait2
+tcp_info

libc-test/semver/linux-musl.txt

@@ -80,6 +80,7 @@ process_vm_writev
 pwritev2
 pwritev64
 reallocarray
+tcp_info
 timex
 euidaccess
 eaccess

src/unix/linux_like/linux/gnu/mod.rs

@@ -454,6 +454,44 @@ s! {
         pub aio_flags: ::__u32,
         pub aio_resfd: ::__u32,
     }
+
+    // netinet/tcp.h
+
+    pub struct tcp_info {
+        pub tcpi_state: u8,
+        pub tcpi_ca_state: u8,
+        pub tcpi_retransmits: u8,
+        pub tcpi_probes: u8,
+        pub tcpi_backoff: u8,
+        pub tcpi_options: u8,
+        /// This contains the bitfields `tcpi_snd_wscale` and `tcpi_rcv_wscale`.
+        /// Each is 4 bits.
+        pub tcpi_snd_rcv_wscale: u8,
+        pub tcpi_rto: u32,
+        pub tcpi_ato: u32,
+        pub tcpi_snd_mss: u32,
+        pub tcpi_rcv_mss: u32,
+        pub tcpi_unacked: u32,
+        pub tcpi_sacked: u32,
+        pub tcpi_lost: u32,
+        pub tcpi_retrans: u32,
+        pub tcpi_fackets: u32,
+        pub tcpi_last_data_sent: u32,
+        pub tcpi_last_ack_sent: u32,
+        pub tcpi_last_data_recv: u32,
+        pub tcpi_last_ack_recv: u32,
+        pub tcpi_pmtu: u32,
+        pub tcpi_rcv_ssthresh: u32,
+        pub tcpi_rtt: u32,
+        pub tcpi_rttvar: u32,
+        pub tcpi_snd_ssthresh: u32,
+        pub tcpi_snd_cwnd: u32,
+        pub tcpi_advmss: u32,
+        pub tcpi_reordering: u32,
+        pub tcpi_rcv_rtt: u32,
+        pub tcpi_rcv_space: u32,
+        pub tcpi_total_retrans: u32,
+    }
 }
 
 impl siginfo_t {

src/unix/linux_like/linux/musl/mod.rs

@@ -348,6 +348,73 @@ s! {
         pub len: ::__u32,
         pub options: ::__u32,
     }
+
+    // netinet/tcp.h
+
+    pub struct tcp_info {
+        pub tcpi_state: u8,
+        pub tcpi_ca_state: u8,
+        pub tcpi_retransmits: u8,
+        pub tcpi_probes: u8,
+        pub tcpi_backoff: u8,
+        pub tcpi_options: u8,
+        /*
+         * FIXME(musl): when musl headers are more up to date
+        /// This contains the bitfields `tcpi_snd_wscale` and `tcpi_rcv_wscale`.
+        /// Each is 4 bits.
+        pub tcpi_snd_rcv_wscale: u8,
+        /// This contains the bitfields `tcpi_delivery_rate_app_limited` (1 bit) and
+        /// `tcpi_fastopen_client_fail` (2 bits).
+        pub tcpi_delivery_fastopen_bitfields: u8,
+        */
+        pub tcpi_rto: u32,
+        pub tcpi_ato: u32,
+        pub tcpi_snd_mss: u32,
+        pub tcpi_rcv_mss: u32,
+        pub tcpi_unacked: u32,
+        pub tcpi_sacked: u32,
+        pub tcpi_lost: u32,
+        pub tcpi_retrans: u32,
+        pub tcpi_fackets: u32,
+        pub tcpi_last_data_sent: u32,
+        pub tcpi_last_ack_sent: u32,
+        pub tcpi_last_data_recv: u32,
+        pub tcpi_last_ack_recv: u32,
+        pub tcpi_pmtu: u32,
+        pub tcpi_rcv_ssthresh: u32,
+        pub tcpi_rtt: u32,
+        pub tcpi_rttvar: u32,
+        pub tcpi_snd_ssthresh: u32,
+        pub tcpi_snd_cwnd: u32,
+        pub tcpi_advmss: u32,
+        pub tcpi_reordering: u32,
+        pub tcpi_rcv_rtt: u32,
+        pub tcpi_rcv_space: u32,
+        pub tcpi_total_retrans: u32,
+        pub tcpi_pacing_rate: u64,
+        pub tcpi_max_pacing_rate: u64,
+        pub tcpi_bytes_acked: u64,
+        pub tcpi_bytes_received: u64,
+        pub tcpi_segs_out: u32,
+        pub tcpi_segs_in: u32,
+        pub tcpi_notsent_bytes: u32,
+        pub tcpi_min_rtt: u32,
+        pub tcpi_data_segs_in: u32,
+        pub tcpi_data_segs_out: u32,
+        pub tcpi_delivery_rate: u64,
+        pub tcpi_busy_time: u64,
+        pub tcpi_rwnd_limited: u64,
+        pub tcpi_sndbuf_limited: u64,
+        pub tcpi_delivered: u32,
+        pub tcpi_delivered_ce: u32,
+        pub tcpi_bytes_sent: u64,
+        pub tcpi_bytes_retrans: u64,
+        pub tcpi_dsack_dups: u32,
+        pub tcpi_reord_seen: u32,
+        // FIXME(musl): to uncomment once CI musl is updated
+        //pub tcpi_rcv_ooopack: u32,
+        //pub tcpi_snd_wnd: u32,
+    }
 }
 
 s_no_extra_traits! {