diff --git a/src/header/sys_times/mod.rs b/src/header/sys_times/mod.rs
index f949566ad5..8149f352bf 100644
--- a/src/header/sys_times/mod.rs
+++ b/src/header/sys_times/mod.rs
@@ -1,9 +1,11 @@
-//! sys/times.h implementation
+//! `sys/times.h` implementation.
+//!
+//! See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/sys_times.h.html>.
 
-use platform;
-use platform::types::*;
-use platform::{Pal, Sys};
+use crate::platform;
+use platform::{Pal, Sys, types::clock_t};
 
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/sys_times.h.html>.
 #[repr(C)]
 pub struct tms {
     tms_utime: clock_t,
@@ -12,6 +14,7 @@ pub struct tms {
     tms_cstime: clock_t,
 }
 
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/times.html>.
 #[unsafe(no_mangle)]
 pub extern "C" fn times(out: *mut tms) -> clock_t {
     Sys::times(out)
diff --git a/src/header/termios/mod.rs b/src/header/termios/mod.rs
index feab8deea6..608ecf3555 100644
--- a/src/header/termios/mod.rs
+++ b/src/header/termios/mod.rs
@@ -1,11 +1,16 @@
-//! termios implementation, following http://pubs.opengroup.org/onlinepubs/7908799/xsh/termios.h.html
+//! `termios.h` implementation.
+//!
+//! See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/termios.h.html>.
 
 use crate::{
     header::{
         errno,
         sys_ioctl::{self, winsize},
     },
-    platform::{self, types::*},
+    platform::{
+        self,
+        types::{c_int, c_ulong, c_void},
+    },
 };
 
 pub use self::sys::*;
@@ -35,6 +40,7 @@ pub const TCSANOW: c_int = 0;
 pub const TCSADRAIN: c_int = 1;
 pub const TCSAFLUSH: c_int = 2;
 
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/termios.h.html>.
 #[cfg(target_os = "linux")]
 #[repr(C)]
 #[derive(Default, Clone)]
@@ -50,6 +56,7 @@ pub struct termios {
 }
 
 // Must match structure in redox_termios
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/termios.h.html>.
 #[cfg(target_os = "redox")]
 #[repr(C)]
 #[derive(Default, Clone)]
@@ -61,11 +68,13 @@ pub struct termios {
     pub c_cc: [cc_t; NCCS],
 }
 
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/tcgetattr.html>.
 #[unsafe(no_mangle)]
 pub unsafe extern "C" fn tcgetattr(fd: c_int, out: *mut termios) -> c_int {
     sys_ioctl::ioctl(fd, sys_ioctl::TCGETS, out as *mut c_void)
 }
 
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/tcsetattr.html>.
 #[unsafe(no_mangle)]
 pub unsafe extern "C" fn tcsetattr(fd: c_int, act: c_int, value: *const termios) -> c_int {
     if act < 0 || act > 2 {
@@ -76,12 +85,14 @@ pub unsafe extern "C" fn tcsetattr(fd: c_int, act: c_int, value: *const termios)
     sys_ioctl::ioctl(fd, sys_ioctl::TCSETS + act as c_ulong, value as *mut c_void)
 }
 
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/cfgetispeed.html>.
 #[cfg(target_os = "linux")]
 #[unsafe(no_mangle)]
 pub unsafe extern "C" fn cfgetispeed(termios_p: *const termios) -> speed_t {
     (*termios_p).__c_ispeed
 }
 
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/cfgetispeed.html>.
 #[cfg(target_os = "redox")]
 #[unsafe(no_mangle)]
 pub unsafe extern "C" fn cfgetispeed(termios_p: *const termios) -> speed_t {
@@ -89,12 +100,14 @@ pub unsafe extern "C" fn cfgetispeed(termios_p: *const termios) -> speed_t {
     0
 }
 
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/cfgetospeed.html>.
 #[cfg(target_os = "linux")]
 #[unsafe(no_mangle)]
 pub unsafe extern "C" fn cfgetospeed(termios_p: *const termios) -> speed_t {
     (*termios_p).__c_ospeed
 }
 
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/cfgetospeed.html>.
 #[cfg(target_os = "redox")]
 #[unsafe(no_mangle)]
 pub unsafe extern "C" fn cfgetospeed(termios_p: *const termios) -> speed_t {
@@ -102,6 +115,7 @@ pub unsafe extern "C" fn cfgetospeed(termios_p: *const termios) -> speed_t {
     0
 }
 
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/cfsetispeed.html>.
 #[cfg(target_os = "linux")]
 #[unsafe(no_mangle)]
 pub unsafe extern "C" fn cfsetispeed(termios_p: *mut termios, speed: speed_t) -> c_int {
@@ -117,6 +131,7 @@ pub unsafe extern "C" fn cfsetispeed(termios_p: *mut termios, speed: speed_t) ->
     }
 }
 
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/cfsetispeed.html>.
 #[cfg(target_os = "redox")]
 #[unsafe(no_mangle)]
 pub unsafe extern "C" fn cfsetispeed(termios_p: *mut termios, speed: speed_t) -> c_int {
@@ -125,6 +140,7 @@ pub unsafe extern "C" fn cfsetispeed(termios_p: *mut termios, speed: speed_t) ->
     -1
 }
 
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/cfsetospeed.html>.
 #[cfg(target_os = "linux")]
 #[unsafe(no_mangle)]
 pub unsafe extern "C" fn cfsetospeed(termios_p: *mut termios, speed: speed_t) -> c_int {
@@ -140,6 +156,7 @@ pub unsafe extern "C" fn cfsetospeed(termios_p: *mut termios, speed: speed_t) ->
     }
 }
 
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/cfsetospeed.html>.
 #[cfg(target_os = "redox")]
 #[unsafe(no_mangle)]
 pub unsafe extern "C" fn cfsetospeed(termios_p: *mut termios, speed: speed_t) -> c_int {
@@ -148,6 +165,9 @@ pub unsafe extern "C" fn cfsetospeed(termios_p: *mut termios, speed: speed_t) ->
     -1
 }
 
+/// Non-POSIX, 4.4 BSD extension
+///
+/// See <https://www.man7.org/linux/man-pages/man3/cfsetispeed.3.html>.
 #[unsafe(no_mangle)]
 pub unsafe extern "C" fn cfsetspeed(termios_p: *mut termios, speed: speed_t) -> c_int {
     let r = cfsetispeed(termios_p, speed);
@@ -157,16 +177,19 @@ pub unsafe extern "C" fn cfsetspeed(termios_p: *mut termios, speed: speed_t) ->
     cfsetospeed(termios_p, speed)
 }
 
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/tcflush.html>.
 #[unsafe(no_mangle)]
 pub unsafe extern "C" fn tcflush(fd: c_int, queue: c_int) -> c_int {
     sys_ioctl::ioctl(fd, sys_ioctl::TCFLSH, queue as *mut c_void)
 }
 
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/tcdrain.html>.
 #[unsafe(no_mangle)]
 pub unsafe extern "C" fn tcdrain(fd: c_int) -> c_int {
     sys_ioctl::ioctl(fd, sys_ioctl::TCSBRK, 1 as *mut _)
 }
 
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/tcsendbreak.html>.
 #[unsafe(no_mangle)]
 pub unsafe extern "C" fn tcsendbreak(fd: c_int, _dur: c_int) -> c_int {
     // non-zero duration is ignored by musl due to it being
@@ -174,11 +197,13 @@ pub unsafe extern "C" fn tcsendbreak(fd: c_int, _dur: c_int) -> c_int {
     sys_ioctl::ioctl(fd, sys_ioctl::TCSBRK, 0 as *mut _)
 }
 
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/tcsetwinsize.html>.
 #[unsafe(no_mangle)]
 pub unsafe extern "C" fn tcsetwinsize(fd: c_int, mut sws: winsize) -> c_int {
     sys_ioctl::ioctl(fd, sys_ioctl::TIOCSWINSZ, &mut sws as *mut _ as *mut c_void)
 }
 
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/tcflow.html>.
 #[unsafe(no_mangle)]
 pub unsafe extern "C" fn tcflow(fd: c_int, action: c_int) -> c_int {
     // non-zero duration is ignored by musl due to it being
@@ -186,6 +211,9 @@ pub unsafe extern "C" fn tcflow(fd: c_int, action: c_int) -> c_int {
     sys_ioctl::ioctl(fd, sys_ioctl::TCXONC, action as *mut _)
 }
 
+/// Non-POSIX, BSD extension
+///
+/// See <https://www.man7.org/linux/man-pages/man3/cfmakeraw.3.html>.
 #[unsafe(no_mangle)]
 pub unsafe extern "C" fn cfmakeraw(termios_p: *mut termios) {
     (*termios_p).c_iflag &=