diff --git a/ci/style.rs b/ci/style.rs
index f5aeabcc71b5..cad08f2eecc8 100644
--- a/ci/style.rs
+++ b/ci/style.rs
@@ -28,10 +28,9 @@
 //! * alignment
 //! * leading colons on paths
 
-use std::env;
-use std::fs;
 use std::io::prelude::*;
 use std::path::Path;
+use std::{env, fs};
 
 macro_rules! t {
     ($e:expr) => {
@@ -130,7 +129,7 @@ fn check_style(file: &str, path: &Path, err: &mut Errors) {
         let line = if is_pub { &line[4..] } else { line };
 
         let line_state = if line.starts_with("use ") {
-            if line.contains("c_void") {
+            if line.contains("c_void") || line.contains("c_char") {
                 continue;
             }
             if is_pub {
diff --git a/libc-test/build.rs b/libc-test/build.rs
index 1af2c40afdf1..1879334fb21a 100644
--- a/libc-test/build.rs
+++ b/libc-test/build.rs
@@ -364,6 +364,9 @@ fn test_apple(target: &str) {
             // FIXME: "'__uint128' undeclared" in C
             "__uint128" => true,
 
+            // `c_char_def` is always public but not always reexported.
+            "c_char_def" => true,
+
             _ => false,
         }
     });
@@ -758,6 +761,8 @@ fn test_windows(target: &str) {
         "ssize_t" if !gnu => true,
         // FIXME: The size and alignment of this type are incorrect
         "time_t" if gnu && i686 => true,
+        // `c_char_def` is always public but not always reexported.
+        "c_char_def" => true,
         _ => false,
     });
 
@@ -975,6 +980,8 @@ fn test_solarish(target: &str) {
 
     cfg.skip_type(move |ty| match ty {
         "sighandler_t" => true,
+        // `c_char_def` is always public but not always reexported.
+        "c_char_def" => true,
         _ => false,
     });
 
@@ -1278,6 +1285,8 @@ fn test_netbsd(target: &str) {
         match ty {
             // FIXME: sighandler_t is crazy across platforms
             "sighandler_t" => true,
+            // `c_char_def` is always public but not always reexported.
+            "c_char_def" => true,
             _ => false,
         }
     });
@@ -1497,7 +1506,8 @@ fn test_dragonflybsd(target: &str) {
         match ty {
             // sighandler_t is crazy across platforms
             "sighandler_t" => true,
-
+            // `c_char_def` is always public but not always reexported.
+            "c_char_def" => true,
             _ => false,
         }
     });
@@ -1659,6 +1669,8 @@ fn test_wasi(target: &str) {
         }
     });
 
+    cfg.skip_type(|ty| ty == "c_char_def");
+
     // These have a different and internal type in header files and are only
     // used here to generate a pointer to them in bindings so skip these tests.
     cfg.skip_static(|c| c.starts_with("_CLOCK_"));
@@ -1907,6 +1919,9 @@ fn test_android(target: &str) {
             // FIXME: "'__uint128' undeclared" in C
             "__uint128" => true,
 
+            // `c_char_def` is always public but not always reexported.
+            "c_char_def" => true,
+
             _ => false,
         }
     });
@@ -2669,6 +2684,9 @@ fn test_freebsd(target: &str) {
             // `eventfd(2)` and things come with it are added in FreeBSD 13
             "eventfd_t" if Some(13) > freebsd_ver => true,
 
+            // `c_char_def` is always public but not always reexported.
+            "c_char_def" => true,
+
             _ => false,
         }
     });
@@ -2989,6 +3007,9 @@ fn test_emscripten(target: &str) {
             // https://github.com/emscripten-core/emscripten/issues/5033
             ty if ty.starts_with("epoll") => true,
 
+            // `c_char_def` is always public but not always reexported.
+            "c_char_def" => true,
+
             // LFS64 types have been removed in Emscripten 3.1.44
             // https://github.com/emscripten-core/emscripten/pull/19812
             t => t.ends_with("64") || t.ends_with("64_t"),
@@ -3260,6 +3281,9 @@ fn test_neutrino(target: &str) {
             // Does not exist in Neutrino
             "locale_t" => true,
 
+            // `c_char_def` is always public but not always reexported.
+            "c_char_def" => true,
+
             _ => false,
         }
     });
@@ -3426,6 +3450,8 @@ fn test_vxworks(target: &str) {
     // FIXME
     cfg.skip_type(move |ty| match ty {
         "stat64" | "sighandler_t" | "off64_t" => true,
+        // `c_char_def` is always public but not always reexported.
+        "c_char_def" => true,
         _ => false,
     });
 
@@ -3773,6 +3799,9 @@ fn test_linux(target: &str) {
             // FIXME: "'__uint128' undeclared" in C
             "__uint128" => true,
 
+            // `c_char_def` is always public but not always reexported.
+            "c_char_def" => true,
+
             t => {
                 if musl {
                     // LFS64 types have been removed in musl 1.2.4+
@@ -4725,6 +4754,8 @@ fn test_linux_like_apis(target: &str) {
             })
             .skip_type(move |ty| match ty {
                 "Elf64_Phdr" | "Elf32_Phdr" => false,
+                // `c_char_def` is always public but not always reexported.
+                "c_char_def" => true,
                 _ => true,
             });
         cfg.generate(src_hotfix_dir().join("lib.rs"), "linux_elf.rs");
@@ -4960,6 +4991,8 @@ fn test_haiku(target: &str) {
             "pthread_condattr_t" => true,
             "pthread_mutexattr_t" => true,
             "pthread_rwlockattr_t" => true,
+            // `c_char_def` is always public but not always reexported.
+            "c_char_def" => true,
             _ => false,
         }
     });
diff --git a/libc-test/semver/freebsd.txt b/libc-test/semver/freebsd.txt
index 853e4c0043dd..486d11e64a60 100644
--- a/libc-test/semver/freebsd.txt
+++ b/libc-test/semver/freebsd.txt
@@ -1504,6 +1504,17 @@ S_IWRITE
 TAB0
 TAB3
 TABDLY
+TCP_BBR_ALGORITHM
+TCP_BBR_DRAIN_PG
+TCP_BBR_IWINTSO
+TCP_BBR_MAX_RTO
+TCP_BBR_MIN_RTO
+TCP_BBR_PACE_OH
+TCP_BBR_PROBE_RTT_INT
+TCP_BBR_STARTUP_LOSS_EXIT
+TCP_BBR_STARTUP_PG
+TCP_BBR_TSLIMITS
+TCP_BBR_USEDEL_RATE
 TCP_CCALGOOPT
 TCP_CONGESTION
 TCP_DELACK
@@ -1530,7 +1541,18 @@ TCP_PCAP_IN
 TCP_PCAP_OUT
 TCP_PERF_INFO
 TCP_PROC_ACCOUNTING
+TCP_RACK_EARLY_SEG
+TCP_RACK_MBUF_QUEUE
+TCP_RACK_MIN_TO
+TCP_RACK_PACE_ALWAYS
+TCP_RACK_PACE_MAX_SEG
+TCP_RACK_PKT_DELAY
+TCP_RACK_PRR_SENDALOT
+TCP_RACK_REORD_FADE
+TCP_RACK_REORD_THRESH
+TCP_RACK_TLP_REDUCE
 TCP_REMOTE_UDP_ENCAPS_PORT
+TCP_REUSPORT_LB_NUMA
 TCP_SHARED_CWND_ALLOWED
 TCP_USE_CMP_ACKS
 THOUSEP
diff --git a/libc-test/semver/fuchsia.txt b/libc-test/semver/fuchsia.txt
index f7bca9ab2e9c..12f67d8b4c60 100644
--- a/libc-test/semver/fuchsia.txt
+++ b/libc-test/semver/fuchsia.txt
@@ -1446,6 +1446,7 @@ sigwait
 sigwaitinfo
 sockaddr_ll
 sockaddr_nl
+sockaddr_vm
 splice
 spwd
 srand
diff --git a/src/fuchsia/mod.rs b/src/fuchsia/mod.rs
index 71b88f579a39..8e56e3f62928 100644
--- a/src/fuchsia/mod.rs
+++ b/src/fuchsia/mod.rs
@@ -357,6 +357,14 @@ s! {
         pub sin6_scope_id: u32,
     }
 
+    pub struct sockaddr_vm {
+        pub svm_family: sa_family_t,
+        pub svm_reserved1: c_ushort,
+        pub svm_port: crate::in_port_t,
+        pub svm_cid: c_uint,
+        pub svm_zero: [u8; 4],
+    }
+
     pub struct addrinfo {
         pub ai_flags: c_int,
         pub ai_family: c_int,
diff --git a/src/hermit.rs b/src/hermit.rs
index 2b470e78d3af..9363fed78830 100644
--- a/src/hermit.rs
+++ b/src/hermit.rs
@@ -1,15 +1,8 @@
 //! Hermit C type definitions
 
+pub use crate::arch::c_char_def as c_char;
 use crate::prelude::*;
 
-cfg_if! {
-    if #[cfg(any(target_arch = "aarch64", target_arch = "riscv64"))] {
-        pub type c_char = u8;
-    } else {
-        pub type c_char = i8;
-    }
-}
-
 pub type c_schar = i8;
 pub type c_uchar = u8;
 pub type c_short = i16;
diff --git a/src/lib.rs b/src/lib.rs
index 9ac6df16073e..569775095fa8 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -41,6 +41,44 @@ cfg_if! {
 
 pub use core::ffi::c_void;
 
+/// Type definitions that are coupled tighter to architecture than OS.
+mod arch {
+    cfg_if! {
+        // This configuration comes from `rust-lang/rust` in `library/core/src/ffi/mod.rs`.
+        if #[cfg(all(
+            not(windows),
+            // FIXME(ctest): just use `target_vendor` = "apple"` once `ctest` supports it
+            not(any(
+                target_os = "macos",
+                target_os = "ios",
+                target_os = "tvos",
+                target_os = "watchos",
+                target_os = "visionos",
+            )),
+            any(
+                target_arch = "aarch64",
+                target_arch = "arm",
+                target_arch = "csky",
+                target_arch = "hexagon",
+                target_arch = "msp430",
+                target_arch = "powerpc",
+                target_arch = "powerpc64",
+                target_arch = "riscv64",
+                target_arch = "riscv32",
+                target_arch = "s390x",
+                target_arch = "xtensa",
+            )
+        ))] {
+            // To be reexported as `c_char`
+            // FIXME(ctest): just name these `c_char` once `ctest` learns that these don't get
+            // exported.
+            pub type c_char_def = u8;
+        } else {
+            pub type c_char_def = i8;
+        }
+    }
+}
+
 cfg_if! {
     if #[cfg(windows)] {
         mod fixed_width_ints;
diff --git a/src/solid/aarch64.rs b/src/solid/aarch64.rs
index ceabea397b80..4032488b6c0d 100644
--- a/src/solid/aarch64.rs
+++ b/src/solid/aarch64.rs
@@ -1,4 +1,4 @@
-pub type c_char = i8;
+pub type c_char = u8;
 pub type wchar_t = u32;
 pub type c_long = i64;
 pub type c_ulong = u64;
diff --git a/src/solid/arm.rs b/src/solid/arm.rs
index 04cc1542deae..55240068aa08 100644
--- a/src/solid/arm.rs
+++ b/src/solid/arm.rs
@@ -1,4 +1,4 @@
-pub type c_char = i8;
+pub type c_char = u8;
 pub type wchar_t = u32;
 pub type c_long = i32;
 pub type c_ulong = u32;
diff --git a/src/teeos/mod.rs b/src/teeos/mod.rs
index b9a46f946a84..40bc0c0549a0 100644
--- a/src/teeos/mod.rs
+++ b/src/teeos/mod.rs
@@ -5,9 +5,6 @@
 #![allow(non_camel_case_types)]
 #![allow(non_snake_case)]
 
-// only supported on Rust > 1.59, so we can directly reexport c_void from core.
-pub use core::ffi::c_void;
-
 use crate::prelude::*;
 
 pub type c_schar = i8;
diff --git a/src/trusty.rs b/src/trusty.rs
index 2d2b78881a75..676a456d892f 100644
--- a/src/trusty.rs
+++ b/src/trusty.rs
@@ -1,18 +1,10 @@
-pub use core::ffi::c_void;
-
+pub use crate::arch::c_char_def as c_char;
+use crate::prelude::*;
 pub type size_t = usize;
 pub type ssize_t = isize;
 
 pub type off_t = i64;
 
-cfg_if! {
-    if #[cfg(any(target_arch = "aarch64", target_arch = "arm"))] {
-        pub type c_char = u8;
-    } else if #[cfg(target_arch = "x86_64")] {
-        pub type c_char = i8;
-    }
-}
-
 pub type c_schar = i8;
 pub type c_uchar = u8;
 pub type c_short = i16;
diff --git a/src/unix/bsd/freebsdlike/freebsd/mod.rs b/src/unix/bsd/freebsdlike/freebsd/mod.rs
index 72e5e7fdae55..ae4e366afdd4 100644
--- a/src/unix/bsd/freebsdlike/freebsd/mod.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/mod.rs
@@ -3764,6 +3764,30 @@ pub const TCP_FUNCTION_ALIAS: c_int = 8193;
 pub const TCP_FASTOPEN_PSK_LEN: c_int = 16;
 pub const TCP_FUNCTION_NAME_LEN_MAX: c_int = 32;
 
+pub const TCP_REUSPORT_LB_NUMA: c_int = 1026;
+pub const TCP_RACK_MBUF_QUEUE: c_int = 1050;
+pub const TCP_RACK_TLP_REDUCE: c_int = 1052;
+pub const TCP_RACK_PACE_MAX_SEG: c_int = 1054;
+pub const TCP_RACK_PACE_ALWAYS: c_int = 1055;
+pub const TCP_RACK_PRR_SENDALOT: c_int = 1057;
+pub const TCP_RACK_MIN_TO: c_int = 1058;
+pub const TCP_RACK_EARLY_SEG: c_int = 1060;
+pub const TCP_RACK_REORD_THRESH: c_int = 1061;
+pub const TCP_RACK_REORD_FADE: c_int = 1062;
+pub const TCP_RACK_TLP_THRESH: c_int = 1063;
+pub const TCP_RACK_PKT_DELAY: c_int = 1064;
+pub const TCP_BBR_IWINTSO: c_int = 1067;
+pub const TCP_BBR_STARTUP_PG: c_int = 1069;
+pub const TCP_BBR_DRAIN_PG: c_int = 1070;
+pub const TCP_BBR_PROBE_RTT_INT: c_int = 1072;
+pub const TCP_BBR_STARTUP_LOSS_EXIT: c_int = 1074;
+pub const TCP_BBR_TSLIMITS: c_int = 1076;
+pub const TCP_BBR_PACE_OH: c_int = 1077;
+pub const TCP_BBR_USEDEL_RATE: c_int = 1079;
+pub const TCP_BBR_MIN_RTO: c_int = 1080;
+pub const TCP_BBR_MAX_RTO: c_int = 1081;
+pub const TCP_BBR_ALGORITHM: c_int = 1083;
+
 pub const IP_BINDANY: c_int = 24;
 pub const IP_BINDMULTI: c_int = 25;
 pub const IP_RSS_LISTEN_BUCKET: c_int = 26;
diff --git a/src/unix/linux_like/android/b64/riscv64/mod.rs b/src/unix/linux_like/android/b64/riscv64/mod.rs
index f214fe33702a..d35c40895510 100644
--- a/src/unix/linux_like/android/b64/riscv64/mod.rs
+++ b/src/unix/linux_like/android/b64/riscv64/mod.rs
@@ -1,7 +1,7 @@
 use crate::off64_t;
 use crate::prelude::*;
 
-pub type c_char = i8;
+pub type c_char = u8;
 pub type wchar_t = u32;
 pub type greg_t = i64;
 pub type __u64 = c_ulonglong;
diff --git a/src/unix/linux_like/linux/uclibc/x86_64/mod.rs b/src/unix/linux_like/linux/uclibc/x86_64/mod.rs
index ce9191476558..709b0d152444 100644
--- a/src/unix/linux_like/linux/uclibc/x86_64/mod.rs
+++ b/src/unix/linux_like/linux/uclibc/x86_64/mod.rs
@@ -6,7 +6,7 @@ use crate::prelude::*;
 pub type blkcnt_t = i64;
 pub type blksize_t = i64;
 pub type clock_t = i64;
-pub type c_char = u8;
+pub type c_char = i8;
 pub type c_long = i64;
 pub type c_ulong = u64;
 pub type fsblkcnt_t = c_ulong;
diff --git a/src/unix/newlib/espidf/mod.rs b/src/unix/newlib/espidf/mod.rs
index 4e3898153357..1ac5113c917b 100644
--- a/src/unix/newlib/espidf/mod.rs
+++ b/src/unix/newlib/espidf/mod.rs
@@ -1,7 +1,7 @@
 use crate::prelude::*;
 
 pub type clock_t = c_ulong;
-pub type c_char = i8;
+pub type c_char = u8;
 pub type wchar_t = u32;
 
 pub type c_long = i32;
diff --git a/src/unix/newlib/vita/mod.rs b/src/unix/newlib/vita/mod.rs
index 120c4d54972f..1a8c89319fa2 100644
--- a/src/unix/newlib/vita/mod.rs
+++ b/src/unix/newlib/vita/mod.rs
@@ -3,7 +3,7 @@ use crate::prelude::*;
 
 pub type clock_t = c_long;
 
-pub type c_char = i8;
+pub type c_char = u8;
 pub type wchar_t = u32;
 
 pub type c_long = i32;
diff --git a/src/unix/nuttx/mod.rs b/src/unix/nuttx/mod.rs
index 95d1156bfc48..ed3e1ed8bfa3 100644
--- a/src/unix/nuttx/mod.rs
+++ b/src/unix/nuttx/mod.rs
@@ -1,3 +1,4 @@
+pub use crate::arch::c_char_def as c_char;
 use crate::prelude::*;
 use crate::{in6_addr, in_addr_t, timespec, DIR};
 
@@ -5,7 +6,6 @@ pub type nlink_t = u16;
 pub type ino_t = u16;
 pub type blkcnt_t = u64;
 pub type blksize_t = i16;
-pub type c_char = i8;
 pub type c_long = isize;
 pub type c_ulong = usize;
 pub type cc_t = u8;
diff --git a/src/unix/redox/mod.rs b/src/unix/redox/mod.rs
index 3a8886e289a3..c55750922443 100644
--- a/src/unix/redox/mod.rs
+++ b/src/unix/redox/mod.rs
@@ -1,6 +1,6 @@
+pub use crate::arch::c_char_def as c_char;
 use crate::prelude::*;
 
-pub type c_char = i8;
 pub type wchar_t = i32;
 
 cfg_if! {
diff --git a/src/unix/solarish/mod.rs b/src/unix/solarish/mod.rs
index 6f35a1e71284..0f398ca44826 100644
--- a/src/unix/solarish/mod.rs
+++ b/src/unix/solarish/mod.rs
@@ -1,8 +1,8 @@
 use core::mem::size_of;
 
+pub use crate::arch::c_char_def as c_char;
 use crate::prelude::*;
 
-pub type c_char = i8;
 pub type c_long = i64;
 pub type c_ulong = u64;
 pub type caddr_t = *mut c_char;
diff --git a/src/vxworks/riscv32.rs b/src/vxworks/riscv32.rs
index e617bb83c6ce..40a8e338e83a 100644
--- a/src/vxworks/riscv32.rs
+++ b/src/vxworks/riscv32.rs
@@ -1,4 +1,4 @@
-pub type c_char = i8;
+pub type c_char = u8;
 pub type wchar_t = i32;
 pub type c_long = i32;
 pub type c_ulong = u32;
diff --git a/src/vxworks/riscv64.rs b/src/vxworks/riscv64.rs
index 5e95ea2567dd..ccd68b0c64f8 100644
--- a/src/vxworks/riscv64.rs
+++ b/src/vxworks/riscv64.rs
@@ -1,4 +1,4 @@
-pub type c_char = i8;
+pub type c_char = u8;
 pub type wchar_t = i32;
 pub type c_long = i64;
 pub type c_ulong = u64;
diff --git a/triagebot.toml b/triagebot.toml
index 6f8200cb14c2..7a103b8fb72a 100644
--- a/triagebot.toml
+++ b/triagebot.toml
@@ -11,7 +11,6 @@ contributing_url = "https://github.com/rust-lang/libc/blob/HEAD/CONTRIBUTING.md"
 
 [assign.owners]
 "*" = [
-    "@JohnTitor",
     "@tgross35",
 ]