implement clock_gettime, clock_getres, clock_settime #1100

kevinwern · 2019-07-24T04:24:43Z

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.

asomers · 2019-07-24T14:49:57Z

src/time.rs

+}
+
+pub fn clock_getres(clk_id: ClockId) -> Result<TimeSpec> {
+    let mut c_time = libc::timespec {tv_sec: 0, tv_nsec: 0};


Please use MaybeUninit instead of zero-initializing. That will cause the test to fail for now, but they'll pass as soon as #1096 is fixed.

MaybeUninit is the correct thing to do here, not zero-initialization.

asomers · 2019-07-24T14:55:09Z

test/test_time.rs

+pub fn test_clock_settime() {
+    require_capability!(CAP_SYS_TIME);
+    let ts = TimeSpec::from(timespec{tv_sec: 10000000, tv_nsec: 100});
+    let res = clock_settime(ClockId::CLOCK_REALTIME, ts).unwrap();


Lol, this will set the system time back to April 26, 1970! That's not a safe test. There's probably little you can do to test clock_settime. Perhaps it would be ok to set it to the current time.

asomers · 2019-07-24T14:55:58Z

test/test_time.rs

+
+#[test]
+pub fn test_clock_settime() {
+    require_capability!(CAP_SYS_TIME);


require_capability is a Linux-only macro.

kevinwern · 2019-07-31T18:56:07Z

Was making some of the changes but getting on a flight now...will follow up with the rest

asomers · 2019-08-07T01:48:35Z

src/time.rs

@@ -3,7 +3,8 @@ use {Result, Errno};
 use libc;

 libc_enum! {
-    #[repr(i32)]
+    #[cfg_attr(target_os = "darwin", repr(i32))]
+    #[cfg_attr(not(target_os = "darwin"), repr(u32))]


This isn't correct. Check the libc crate to see what the actual size is on various platforms:

> rg type.clockid_t linux_like/mod.rs 4:pub type clockid_t = ::c_int; newlib/mod.rs 4:pub type clockid_t = ::c_ulong; uclibc/mod.rs 6:pub type clockid_t = ::c_int; solarish/mod.rs 5:pub type clockid_t = ::c_int; haiku/mod.rs 9:pub type clockid_t = i32; redox/mod.rs 9:pub type clockid_t = ::c_int; hermit/mod.rs 39:pub type clockid_t = c_ulong; bsd/netbsdlike/mod.rs 10:pub type clockid_t = ::c_int; bsd/apple/mod.rs 16:pub type clockid_t = ::c_uint; bsd/freebsdlike/dragonfly/mod.rs 8:pub type clockid_t = ::c_ulong; bsd/freebsdlike/freebsd/mod.rs 6:pub type clockid_t = ::c_int;

asomers · 2019-08-07T01:52:49Z

src/time.rs

+}
+
+pub fn clock_getres(clk_id: ClockId) -> Result<TimeSpec> {
+    let mut c_time = libc::timespec {tv_sec: 0, tv_nsec: 0};


MaybeUninit is the correct thing to do here, not zero-initialization.

kevinwern · 2019-08-27T05:04:27Z

Sorry, ended up not having time for a while after pushing up some of the changes...will mark things as a WIP in that situation in the future. I should be around now, though.

Anyway, I updated the conditional compilation to reflect what is in libc and used MaybeUninit where we need to create and pass a timespec ourselves instead of expecting one from the caller.

Also decided to just ditch the set_* tests. Don't think there's much value in that, and I couldn't find a consistent, safe thing to use for all platforms (my computer uses NTP so I didn't catch that I had changed the clock ID to CLOCK_REALTIME in my stupid tinkering to create a "successful" test). I think I've been overtesting in my PRs anyway.

Let me know what you think. Sorry again for falling off for a bit.

asomers · 2019-09-03T22:04:35Z

src/time.rs

+                target_os = "illumos",
+                all(target_env = "newlib", target_arch = "arm"),
+               ), repr(i32))]
+    #[cfg_attr(target_os = "macos", repr(u32))]


Don't forget ios

asomers · 2019-09-03T22:05:47Z

src/time.rs

+                target_os = "emscripten",
+                target_os = "solaris",
+                target_os = "illumos",
+                all(target_env = "newlib", target_arch = "arm"),


Why the special case for target_arch on newlib? I don't see that in libc.

For newlib, the supported target_archs are only arm and aarch64. While the type clockid_t is defined here:
https://github.com/rust-lang/libc/blob/49c1d138e3b4719e21ee7cbce7dd903543cda80d/src/unix/newlib/mod.rs#L4

c_ulong is defined for each arch in their respective modules:
https://github.com/rust-lang/libc/blob/49c1d138e3b4719e21ee7cbce7dd903543cda80d/src/unix/newlib/arm/mod.rs#L5
https://github.com/rust-lang/libc/blob/49c1d138e3b4719e21ee7cbce7dd903543cda80d/src/unix/newlib/aarch64/mod.rs#L5

Just realized that I had put the "arm" case under i32 rather than u32. Hopefully makes more sense now.

asomers · 2019-09-03T22:09:40Z

src/time.rs

+                target_os = "netbsd",
+                target_os = "openbsd",
+                target_os = "haiku",
+                target_os = "linux",


This should be all(target_os = "linux", not(target_env = "newlib")) and likewise for android and emscripten.

Ah, that's very tricky. Added that in the case of everything that appears after newlib/uclibc. In some cases it had to be all(target_os = "<x>", not(target_env = "newlib", target_env = "uclibc")).

asomers · 2019-09-20T02:12:19Z

You should be able to fix the test failures by rebasing now.

asomers · 2019-09-28T16:30:55Z

Ok, I think this is good, but you need to squash before we can merge.

kevinwern · 2019-12-02T23:07:50Z

Squashed a while ago and just rebased again for the changelog. Hopefully good to merge now.

asomers

bors r+

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>

bors · 2019-12-22T00:50:59Z

Build failed

continuous-integration/travis-ci/push

asomers · 2019-12-22T01:30:48Z

I've seen this before. I think it's a bug in glibc. It's certainly nothing to do with your PR.

bors retry

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>

bors · 2019-12-22T01:57:59Z

Build failed

continuous-integration/travis-ci/push

asomers · 2019-12-23T03:21:48Z

Please rebase to fix the musl failure.

xonatius · 2020-07-26T04:38:09Z

I'm interested in some of these functions too for #1275. @kevinwern do you mind if I pick up this PR to implement them?

@kevinwern

1281: Added clock_gettime, clock_getres, clock_settime, clock_getcpuclockid r=asomers a=xonatius Picked up #1100 and added `clock_getcpuclockid` call as well. Credits to @kevinwern for the initial version. https://www.man7.org/linux/man-pages/man2/clock_gettime.2.html https://www.man7.org/linux/man-pages/man3/clock_getcpuclockid.3.html Closes #1275 Co-authored-by: Daniil Bondarev <xonatius@gmail.com>

cemeyer · 2021-09-07T02:34:43Z

Can we close this one after #1281?

asomers · 2021-09-07T23:50:46Z

Yep

kevinwern force-pushed the feature/implement-time-funcs branch 3 times, most recently from 14fce4c to 0b16e15 Compare July 24, 2019 13:50

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kevinwern force-pushed the feature/implement-time-funcs branch from e1b481f to e480d1e Compare September 17, 2019 02:38

kevinwern added a commit to kevinwern/nix that referenced this pull request Sep 17, 2019

CHANGELOG: move nix-rust#1100 (this) to unreleased after rebase

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kevinwern added a commit to kevinwern/nix that referenced this pull request Sep 22, 2019

CHANGELOG: move nix-rust#1100 (this) to unreleased after rebase

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kevinwern force-pushed the feature/implement-time-funcs branch from 19f57d4 to 7a10cae Compare September 22, 2019 22:07

kevinwern force-pushed the feature/implement-time-funcs branch from 7a10cae to 8051751 Compare September 30, 2019 03:18

kevinwern force-pushed the feature/implement-time-funcs branch 2 times, most recently from d2a1c8d to e84c05b Compare December 2, 2019 22:04

implement clock_gettime, clock_getres, clock_settime

c9b4a36

kevinwern force-pushed the feature/implement-time-funcs branch from e84c05b to c9b4a36 Compare December 2, 2019 22:08

asomers approved these changes Dec 22, 2019

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xonatius mentioned this pull request Aug 1, 2020

Added clock_gettime, clock_getres, clock_settime, clock_getcpuclockid #1281

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implement clock_gettime, clock_getres, clock_settime #1100

implement clock_gettime, clock_getres, clock_settime #1100

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implement clock_gettime, clock_getres, clock_settime #1100

implement clock_gettime, clock_getres, clock_settime #1100

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