diff --git a/src/sys/uio.rs b/src/sys/uio.rs
index e893cb42f7..29e3647b35 100644
--- a/src/sys/uio.rs
+++ b/src/sys/uio.rs
@@ -182,7 +182,7 @@ feature! {
 /// [ptrace]: ../ptrace/index.html
 /// [`IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
 /// [`RemoteIoVec`]: struct.RemoteIoVec.html
-#[cfg(all(any(target_os = "linux", target_os = "android"), not(target_env = "uclibc")))]
+#[cfg(all(linux_android, not(target_env = "uclibc")))]
 pub fn process_vm_writev(
     pid: crate::unistd::Pid,
     local_iov: &[IoSlice<'_>],
@@ -217,7 +217,7 @@ pub fn process_vm_writev(
 /// [`ptrace`]: ../ptrace/index.html
 /// [`IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
 /// [`RemoteIoVec`]: struct.RemoteIoVec.html
-#[cfg(all(any(target_os = "linux", target_os = "android"), not(target_env = "uclibc")))]
+#[cfg(all(linux_android, not(target_env = "uclibc")))]
 pub fn process_vm_readv(
     pid: crate::unistd::Pid,
     local_iov: &mut [IoSliceMut<'_>],
diff --git a/src/sys/wait.rs b/src/sys/wait.rs
index 299ea1bec9..844e165c18 100644
--- a/src/sys/wait.rs
+++ b/src/sys/wait.rs
@@ -24,11 +24,10 @@ libc_bitflags!(
         /// [`SIGSTOP`](crate::sys::signal::Signal::SIGSTOP) signal.
         WUNTRACED;
         /// Report the status of selected processes which have terminated.
-        #[cfg(any(target_os = "android",
+        #[cfg(any(linux_android,
+                  apple_targets,
                   target_os = "freebsd",
                   target_os = "haiku",
-                  apple_targets,
-                  target_os = "linux",
                   target_os = "redox",
                   target_os = "netbsd"))]
         WEXITED;
@@ -37,31 +36,29 @@ libc_bitflags!(
         /// [`SIGCONT`](crate::sys::signal::Signal::SIGCONT) signal.
         WCONTINUED;
         /// An alias for WUNTRACED.
-        #[cfg(any(target_os = "android",
+        #[cfg(any(linux_android,
+                  apple_targets,
                   target_os = "freebsd",
                   target_os = "haiku",
-                  apple_targets,
-                  target_os = "linux",
                   target_os = "redox",
                   target_os = "netbsd"))]
         WSTOPPED;
         /// Don't reap, just poll status.
-        #[cfg(any(target_os = "android",
+        #[cfg(any(linux_android,
+                  apple_targets,
                   target_os = "freebsd",
                   target_os = "haiku",
-                  apple_targets,
-                  target_os = "linux",
                   target_os = "redox",
                   target_os = "netbsd"))]
         WNOWAIT;
         /// Don't wait on children of other threads in this group
-        #[cfg(any(target_os = "android", target_os = "linux", target_os = "redox"))]
+        #[cfg(any(linux_android, target_os = "redox"))]
         __WNOTHREAD;
         /// Wait on all children, regardless of type
-        #[cfg(any(target_os = "android", target_os = "linux", target_os = "redox"))]
+        #[cfg(any(linux_android, target_os = "redox"))]
         __WALL;
         /// Wait for "clone" children only.
-        #[cfg(any(target_os = "android", target_os = "linux", target_os = "redox"))]
+        #[cfg(any(linux_android, target_os = "redox"))]
         __WCLONE;
     }
 );
@@ -205,7 +202,7 @@ impl WaitStatus {
             WaitStatus::Signaled(pid, term_signal(status)?, dumped_core(status))
         } else if stopped(status) {
             cfg_if! {
-                if #[cfg(any(target_os = "android", target_os = "linux"))] {
+                if #[cfg(linux_android)] {
                     fn decode_stopped(pid: Pid, status: i32) -> Result<WaitStatus> {
                         let status_additional = stop_additional(status);
                         Ok(if syscall_stop(status) {
diff --git a/src/time.rs b/src/time.rs
index cdcad0977d..6e8aac6ac1 100644
--- a/src/time.rs
+++ b/src/time.rs
@@ -1,11 +1,5 @@
 use crate::sys::time::TimeSpec;
-#[cfg(any(
-    target_os = "freebsd",
-    target_os = "dragonfly",
-    target_os = "linux",
-    target_os = "android",
-    target_os = "emscripten",
-))]
+#[cfg(any(freebsdlike, linux_android, target_os = "emscripten"))]
 #[cfg(feature = "process")]
 use crate::unistd::Pid;
 use crate::{Errno, Result};
@@ -29,10 +23,8 @@ impl ClockId {
     #![feature = "process"]
     /// Returns `ClockId` of a `pid` CPU-time clock
     #[cfg(any(
-        target_os = "freebsd",
-        target_os = "dragonfly",
-        target_os = "linux",
-        target_os = "android",
+        freebsdlike,
+        linux_android,
         target_os = "emscripten",
     ))]
     pub fn pid_cpu_clock_id(pid: Pid) -> Result<Self> {
@@ -62,28 +54,13 @@ impl ClockId {
         self.0
     }
 
-    #[cfg(any(
-        target_os = "android",
-        target_os = "emscripten",
-        target_os = "fuchsia",
-        target_os = "linux"
-    ))]
+    #[cfg(any(linux_android, target_os = "emscripten", target_os = "fuchsia"))]
     pub const CLOCK_BOOTTIME: ClockId = ClockId(libc::CLOCK_BOOTTIME);
-    #[cfg(any(
-        target_os = "android",
-        target_os = "emscripten",
-        target_os = "fuchsia",
-        target_os = "linux"
-    ))]
+    #[cfg(any(linux_android, target_os = "emscripten", target_os = "fuchsia"))]
     pub const CLOCK_BOOTTIME_ALARM: ClockId =
         ClockId(libc::CLOCK_BOOTTIME_ALARM);
     pub const CLOCK_MONOTONIC: ClockId = ClockId(libc::CLOCK_MONOTONIC);
-    #[cfg(any(
-        target_os = "android",
-        target_os = "emscripten",
-        target_os = "fuchsia",
-        target_os = "linux"
-    ))]
+    #[cfg(any(linux_android, target_os = "emscripten", target_os = "fuchsia"))]
     pub const CLOCK_MONOTONIC_COARSE: ClockId =
         ClockId(libc::CLOCK_MONOTONIC_COARSE);
     #[cfg(freebsdlike)]
@@ -92,42 +69,25 @@ impl ClockId {
     #[cfg(freebsdlike)]
     pub const CLOCK_MONOTONIC_PRECISE: ClockId =
         ClockId(libc::CLOCK_MONOTONIC_PRECISE);
-    #[cfg(any(
-        target_os = "android",
-        target_os = "emscripten",
-        target_os = "fuchsia",
-        target_os = "linux"
-    ))]
+    #[cfg(any(linux_android, target_os = "emscripten", target_os = "fuchsia"))]
     pub const CLOCK_MONOTONIC_RAW: ClockId = ClockId(libc::CLOCK_MONOTONIC_RAW);
     #[cfg(any(
-        target_os = "android",
+        linux_android,
+        apple_targets,
+        freebsdlike,
         target_os = "emscripten",
         target_os = "fuchsia",
-        apple_targets,
-        target_os = "freebsd",
-        target_os = "dragonfly",
         target_os = "redox",
-        target_os = "linux"
     ))]
     pub const CLOCK_PROCESS_CPUTIME_ID: ClockId =
         ClockId(libc::CLOCK_PROCESS_CPUTIME_ID);
     #[cfg(freebsdlike)]
     pub const CLOCK_PROF: ClockId = ClockId(libc::CLOCK_PROF);
     pub const CLOCK_REALTIME: ClockId = ClockId(libc::CLOCK_REALTIME);
-    #[cfg(any(
-        target_os = "android",
-        target_os = "emscripten",
-        target_os = "fuchsia",
-        target_os = "linux"
-    ))]
+    #[cfg(any(linux_android, target_os = "emscripten", target_os = "fuchsia"))]
     pub const CLOCK_REALTIME_ALARM: ClockId =
         ClockId(libc::CLOCK_REALTIME_ALARM);
-    #[cfg(any(
-        target_os = "android",
-        target_os = "emscripten",
-        target_os = "fuchsia",
-        target_os = "linux"
-    ))]
+    #[cfg(any(linux_android, target_os = "emscripten", target_os = "fuchsia"))]
     pub const CLOCK_REALTIME_COARSE: ClockId =
         ClockId(libc::CLOCK_REALTIME_COARSE);
     #[cfg(freebsdlike)]
@@ -143,21 +103,14 @@ impl ClockId {
         all(target_os = "linux", target_env = "musl")
     ))]
     pub const CLOCK_SGI_CYCLE: ClockId = ClockId(libc::CLOCK_SGI_CYCLE);
-    #[cfg(any(
-        target_os = "android",
-        target_os = "emscripten",
-        target_os = "fuchsia",
-        target_os = "linux"
-    ))]
+    #[cfg(any(linux_android, target_os = "emscripten", target_os = "fuchsia"))]
     pub const CLOCK_TAI: ClockId = ClockId(libc::CLOCK_TAI);
     #[cfg(any(
-        target_os = "android",
+        linux_android,
+        apple_targets,
+        freebsdlike,
         target_os = "emscripten",
         target_os = "fuchsia",
-        apple_targets,
-        target_os = "freebsd",
-        target_os = "dragonfly",
-        target_os = "linux"
     ))]
     pub const CLOCK_THREAD_CPUTIME_ID: ClockId =
         ClockId(libc::CLOCK_THREAD_CPUTIME_ID);
@@ -224,13 +177,7 @@ pub fn clock_settime(clock_id: ClockId, timespec: TimeSpec) -> Result<()> {
 
 /// Get the clock id of the specified process id, (see
 /// [clock_getcpuclockid(3)](https://pubs.opengroup.org/onlinepubs/009695399/functions/clock_getcpuclockid.html)).
-#[cfg(any(
-    target_os = "freebsd",
-    target_os = "dragonfly",
-    target_os = "linux",
-    target_os = "android",
-    target_os = "emscripten",
-))]
+#[cfg(any(freebsdlike, linux_android, target_os = "emscripten"))]
 #[cfg(feature = "process")]
 #[cfg_attr(docsrs, doc(cfg(feature = "process")))]
 pub fn clock_getcpuclockid(pid: Pid) -> Result<ClockId> {