Merge #1100

1100: implement clock_gettime, clock_getres, clock_settime r=asomers a=kevinwern See: https://pubs.opengroup.org/onlinepubs/007908799/xsh/clock_settime.html Again related to: https://github.com/CraneStation/wasi-common/issues/16 Conditional inclusion of clock IDs based on looking through libc. Co-authored-by: Kevin Wern <kevin.m.wern@gmail.com>
nix-rust · Dec 22, 2019 · d2aa08b · d2aa08b
2 parents 1282815 + c9b4a36
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -4,6 +4,9 @@ All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased] - ReleaseDate
+### Added
+- Add `clock_gettime`, `clock_settime`, `clock_getres`
+  ([#1100](https://github.com/nix-rust/nix/pull/1100))
 
 ## [0.16.0] - 1 December 2019
 ### Added

diff --git a/src/lib.rs b/src/lib.rs
@@ -64,6 +64,7 @@ pub mod poll;
 pub mod pty;
 pub mod sched;
 pub mod sys;
+pub mod time;
 // This can be implemented for other platforms as soon as libc
 // provides bindings for them.
 #[cfg(all(target_os = "linux",

diff --git a/src/sys/time.rs b/src/sys/time.rs
@@ -67,6 +67,12 @@ impl AsRef<timespec> for TimeSpec {
     }
 }
 
+impl From<timespec> for TimeSpec {
+    fn from(ts: timespec) -> Self {
+        TimeSpec(ts)
+    }
+}
+
 impl Ord for TimeSpec {
     // The implementation of cmp is simplified by assuming that the struct is
     // normalized.  That is, tv_nsec must always be within [0, 1_000_000_000)

diff --git a/src/time.rs b/src/time.rs
@@ -0,0 +1,184 @@
+use sys::time::TimeSpec;
+use std::mem::MaybeUninit;
+use {Result, Errno};
+use libc;
+
+libc_enum! {
+    #[cfg_attr(any(
+                target_env = "uclibc",
+                target_os = "fuchsia",
+                target_os = "redox",
+                target_os = "freebsd",
+                target_os = "netbsd",
+                target_os = "openbsd",
+                target_os = "haiku",
+                all(not(target_env = "newlib"),
+                    any(target_os = "linux",
+                        target_os = "android",
+                        target_os = "emscripten",
+                        target_os = "solaris",
+                        target_os = "illumos")),
+               ), repr(i32))]
+    #[cfg_attr(any(
+            all(target_env = "newlib", target_arch = "arm"),
+            target_os = "macos",
+            target_os = "ios",
+            ), repr(u32))]
+    #[cfg_attr(any(
+                all(target_env = "newlib", target_arch = "aarch64"),
+                all(not(any(target_env = "newlib", target_env = "uclibc")), target_os = "hermit"),
+                target_os = "dragonfly",
+              ), repr(u64))]
+    pub enum ClockId {
+        #[cfg(any(target_os = "fuchsia",
+                  all(not(any(target_env = "uclibc",
+                              target_env = "newlib")),
+                      any(target_os = "linux",
+                          target_os = "android",
+                          target_os = "emscripten"),
+                      )
+                  ))]
+        CLOCK_BOOTTIME,
+        #[cfg(any(target_os = "fuchsia",
+                  all(not(any(target_env = "uclibc",
+                              target_env = "newlib")),
+                      any(target_os = "linux",
+                          target_os = "android",
+                          target_os = "emscripten"))))]
+        CLOCK_BOOTTIME_ALARM,
+        CLOCK_MONOTONIC,
+        #[cfg(any(target_os = "fuchsia",
+                  all(not(any(target_env = "uclibc",
+                              target_env = "newlib")),
+                      any(target_os = "linux",
+                          target_os = "android",
+                          target_os = "emscripten"))))]
+        CLOCK_MONOTONIC_COARSE,
+        #[cfg(any(target_os = "freebsd",
+                  target_os = "dragonfly"))]
+        CLOCK_MONOTONIC_FAST,
+        #[cfg(any(target_os = "freebsd",
+                  target_os = "dragonfly"))]
+        CLOCK_MONOTONIC_PRECISE,
+        #[cfg(any(target_os = "fuchsia",
+                  all(not(any(target_env = "uclibc",
+                              target_env = "newlib")),
+                      any(target_os = "linux",
+                          target_os = "android",
+                          target_os = "emscripten"))))]
+        CLOCK_MONOTONIC_RAW,
+        #[cfg(any(target_os = "fuchsia",
+                  target_env = "uclibc",
+                  target_os = "macos",
+                  target_os = "ios",
+                  target_os = "freebsd",
+                  target_os = "dragonfly",
+                  all(not(target_env = "newlib"),
+                      any(target_os = "linux",
+                          target_os = "android",
+                          target_os = "emscripten"))))]
+        CLOCK_PROCESS_CPUTIME_ID,
+        #[cfg(any(target_os = "freebsd",
+                  target_os = "dragonfly"))]
+        CLOCK_PROF,
+        CLOCK_REALTIME,
+        #[cfg(any(target_os = "fuchsia",
+                  all(not(any(target_env = "uclibc",
+                              target_env = "newlib")),
+                      any(target_os = "linux",
+                          target_os = "android",
+                          target_os = "emscripten"))))]
+        CLOCK_REALTIME_ALARM,
+        #[cfg(any(target_os = "fuchsia",
+                  all(not(any(target_env = "uclibc",
+                              target_env = "newlib")),
+                      any(target_os = "linux",
+                          target_os = "android",
+                          target_os = "emscripten"))))]
+        CLOCK_REALTIME_COARSE,
+        #[cfg(any(target_os = "freebsd",
+                  target_os = "dragonfly"))]
+        CLOCK_REALTIME_FAST,
+        #[cfg(any(target_os = "freebsd",
+                  target_os = "dragonfly"))]
+        CLOCK_REALTIME_PRECISE,
+        #[cfg(any(target_os = "freebsd",
+                  target_os = "dragonfly"))]
+        CLOCK_SECOND,
+        #[cfg(any(target_os = "fuchsia",
+                  all(not(any(target_env = "uclibc", target_env = "newlib")),
+                      any(target_os = "emscripten",
+                          all(target_os = "linux", target_env = "musl")))))]
+        CLOCK_SGI_CYCLE,
+        #[cfg(any(target_os = "fuchsia",
+                  all(not(any(target_env = "uclibc", target_env = "newlib")),
+                      any(target_os = "emscripten",
+                          all(target_os = "linux", target_env = "musl")))))]
+        CLOCK_TAI,
+        #[cfg(any(
+                  target_env = "uclibc",
+                  target_os = "fuchsia",
+                  target_os = "ios",
+                  target_os = "macos",
+                  target_os = "freebsd",
+                  target_os = "dragonfly",
+                  all(
+                      not(target_env = "newlib"),
+                      any(
+                          target_os = "linux",
+                          target_os = "android",
+                          target_os = "emscripten",
+                      ),
+                  ),
+                )
+            )]
+        CLOCK_THREAD_CPUTIME_ID,
+        #[cfg(any(target_os = "freebsd",
+                  target_os = "dragonfly"))]
+        CLOCK_UPTIME,
+        #[cfg(any(target_os = "freebsd",
+                  target_os = "dragonfly"))]
+        CLOCK_UPTIME_FAST,
+        #[cfg(any(target_os = "freebsd",
+                  target_os = "dragonfly"))]
+        CLOCK_UPTIME_PRECISE,
+        #[cfg(any(target_os = "freebsd",
+                  target_os = "dragonfly"))]
+        CLOCK_VIRTUAL,
+    }
+}
+
+pub fn clock_getres(clk_id: ClockId) -> Result<TimeSpec> {
+    let mut c_time: MaybeUninit<libc::timespec> = MaybeUninit::uninit();
+    let errno = unsafe { libc::clock_getres(clk_id as libc::clockid_t, c_time.as_mut_ptr()) };
+    Errno::result(errno)?;
+    let res = unsafe { c_time.assume_init() };
+    Ok(TimeSpec::from(res))
+}
+
+pub fn clock_gettime(clk_id: ClockId) -> Result<TimeSpec> {
+    let mut c_time: MaybeUninit<libc::timespec> = MaybeUninit::uninit();
+    let errno = unsafe { libc::clock_gettime(clk_id as libc::clockid_t, c_time.as_mut_ptr()) };
+    Errno::result(errno)?;
+    let res = unsafe { c_time.assume_init() };
+    Ok(TimeSpec::from(res))
+}
+
+#[cfg(not(
+        any(
+            target_os = "macos",
+            target_os = "ios",
+            all(
+                not(any(target_env = "uclibc", target_env = "newlibc")),
+                any(
+                    target_os = "redox",
+                    target_os = "hermit",
+                ),
+            ),
+        )
+    )
+ )]
+pub fn clock_settime(clk_id: ClockId, timespec: TimeSpec) -> Result<()> {
+    let res = unsafe { libc::clock_settime(clk_id as libc::clockid_t, timespec.as_ref()) };
+    Errno::result(res).map(drop)
+}
diff --git a/test/test.rs b/test/test.rs
@@ -126,6 +126,7 @@ mod test_sched;
           target_os = "macos"))]
 mod test_sendfile;
 mod test_stat;
+mod test_time;
 mod test_unistd;
 
 use std::os::unix::io::RawFd;

diff --git a/test/test_time.rs b/test/test_time.rs
@@ -0,0 +1,11 @@
+use nix::time::{clock_getres, clock_gettime, ClockId};
+
+#[test]
+pub fn test_clock_getres() {
+    assert!(clock_getres(ClockId::CLOCK_REALTIME).is_ok());
+}
+
+#[test]
+pub fn test_clock_gettime() {
+    assert!(clock_gettime(ClockId::CLOCK_REALTIME).is_ok());
+}