Merge pull request #9688 from xtqqczze/get_clock_resolution

date: remove unsafe

Cargo.lock

@@ -3191,7 +3191,7 @@ dependencies = [
  "clap",
  "fluent",
  "jiff",
- "libc",
+ "nix",
  "parse_datetime",
  "uucore",
  "windows-sys 0.61.2",

fuzz/Cargo.lock

@@ -1597,7 +1597,7 @@ dependencies = [
  "clap",
  "fluent",
  "jiff",
- "libc",
+ "nix",
  "parse_datetime",
  "uucore",
  "windows-sys 0.61.2",

src/uu/date/Cargo.toml

@@ -30,7 +30,7 @@ parse_datetime = { workspace = true }
 uucore = { workspace = true, features = ["parser"] }
 
 [target.'cfg(unix)'.dependencies]
-libc = { workspace = true }
+nix = { workspace = true, features = ["time"] }
 
 [target.'cfg(windows)'.dependencies]
 windows-sys = { workspace = true, features = [

src/uu/date/src/date.rs

@@ -9,10 +9,6 @@ use clap::{Arg, ArgAction, Command};
 use jiff::fmt::strtime;
 use jiff::tz::{TimeZone, TimeZoneDatabase};
 use jiff::{Timestamp, Zoned};
-#[cfg(all(unix, not(target_os = "macos"), not(target_os = "redox")))]
-use libc::clock_settime;
-#[cfg(all(unix, not(target_os = "redox")))]
-use libc::{CLOCK_REALTIME, clock_getres, timespec};
 use std::collections::HashMap;
 use std::fs::File;
 use std::io::{BufRead, BufReader};
@@ -700,25 +696,20 @@ fn get_clock_resolution() -> Timestamp {
 }
 
 #[cfg(all(unix, not(target_os = "redox")))]
+/// Returns the resolution of the system’s realtime clock.
+///
+/// # Panics
+///
+/// Panics if `clock_getres` fails. On a POSIX-compliant system this should not occur,
+/// as `CLOCK_REALTIME` is required to be supported.
+/// Failure would indicate a non-conforming or otherwise broken implementation.
 fn get_clock_resolution() -> Timestamp {
-    let mut timespec = timespec {
-        tv_sec: 0,
-        tv_nsec: 0,
-    };
-    unsafe {
-        // SAFETY: the timespec struct lives for the full duration of this function call.
-        //
-        // The clock_getres function can only fail if the passed clock_id is not
-        // a known clock. All compliant posix implementors must support
-        // CLOCK_REALTIME, therefore this function call cannot fail on any
-        // compliant posix implementation.
-        //
-        // See more here:
-        // https://pubs.opengroup.org/onlinepubs/9799919799/functions/clock_getres.html
-        clock_getres(CLOCK_REALTIME, &raw mut timespec);
-    }
+    use nix::time::{ClockId, clock_getres};
+
+    let timespec = clock_getres(ClockId::CLOCK_REALTIME).unwrap();
+
     #[allow(clippy::unnecessary_cast)] // Cast required on 32-bit platforms
-    Timestamp::constant(timespec.tv_sec as i64, timespec.tv_nsec as i32)
+    Timestamp::constant(timespec.tv_sec() as _, timespec.tv_nsec() as _)
 }
 
 #[cfg(all(unix, target_os = "redox"))]
@@ -766,20 +757,13 @@ fn set_system_datetime(_date: Zoned) -> UResult<()> {
 /// `<https://linux.die.net/man/3/clock_settime>`
 /// `<https://www.gnu.org/software/libc/manual/html_node/Time-Types.html>`
 fn set_system_datetime(date: Zoned) -> UResult<()> {
+    use nix::{sys::time::TimeSpec, time::ClockId};
+
     let ts = date.timestamp();
-    let timespec = timespec {
-        tv_sec: ts.as_second() as _,
-        tv_nsec: ts.subsec_nanosecond() as _,
-    };
+    let timespec = TimeSpec::new(ts.as_second() as _, ts.subsec_nanosecond() as _);
 
-    let result = unsafe { clock_settime(CLOCK_REALTIME, &raw const timespec) };
-
-    if result == 0 {
-        Ok(())
-    } else {
-        Err(std::io::Error::last_os_error()
-            .map_err_context(|| translate!("date-error-cannot-set-date")))
-    }
+    nix::time::clock_settime(ClockId::CLOCK_REALTIME, timespec)
+        .map_err_context(|| translate!("date-error-cannot-set-date"))
 }
 
 #[cfg(windows)]