1 files changed, 26 insertions, 12 deletions

diff --git a/library/std/src/sys/unix/time.rs b/library/std/src/sys/unix/time.rs
index 6f5358340..a9fbc7ab1 100644
--- a/library/std/src/sys/unix/time.rs
+++ b/library/std/src/sys/unix/time.rs
@@ -113,11 +113,7 @@ impl Timespec {
     }
 
     pub fn checked_add_duration(&self, other: &Duration) -> Option<Timespec> {
-        let mut secs = other
-            .as_secs()
-            .try_into() // <- target type would be `i64`
-            .ok()
-            .and_then(|secs| self.tv_sec.checked_add(secs))?;
+        let mut secs = self.tv_sec.checked_add_unsigned(other.as_secs())?;
 
         // Nano calculations can't overflow because nanos are <1B which fit
         // in a u32.
@@ -126,15 +122,11 @@ impl Timespec {
             nsec -= NSEC_PER_SEC as u32;
             secs = secs.checked_add(1)?;
         }
-        Some(Timespec::new(secs, nsec as i64))
+        Some(Timespec::new(secs, nsec.into()))
     }
 
     pub fn checked_sub_duration(&self, other: &Duration) -> Option<Timespec> {
-        let mut secs = other
-            .as_secs()
-            .try_into() // <- target type would be `i64`
-            .ok()
-            .and_then(|secs| self.tv_sec.checked_sub(secs))?;
+        let mut secs = self.tv_sec.checked_sub_unsigned(other.as_secs())?;
 
         // Similar to above, nanos can't overflow.
         let mut nsec = self.tv_nsec.0 as i32 - other.subsec_nanos() as i32;
@@ -142,7 +134,7 @@ impl Timespec {
             nsec += NSEC_PER_SEC as i32;
             secs = secs.checked_sub(1)?;
         }
-        Some(Timespec::new(secs, nsec as i64))
+        Some(Timespec::new(secs, nsec.into()))
     }
 
     #[allow(dead_code)]
@@ -166,6 +158,16 @@ impl Timespec {
         }
         self.to_timespec()
     }
+
+    #[cfg(all(
+        target_os = "linux",
+        target_env = "gnu",
+        target_pointer_width = "32",
+        not(target_arch = "riscv32")
+    ))]
+    pub fn to_timespec64(&self) -> __timespec64 {
+        __timespec64::new(self.tv_sec, self.tv_nsec.0 as _)
+    }
 }
 
 impl From<libc::timespec> for Timespec {
@@ -196,6 +198,18 @@ pub(in crate::sys::unix) struct __timespec64 {
     target_pointer_width = "32",
     not(target_arch = "riscv32")
 ))]
+impl __timespec64 {
+    pub(in crate::sys::unix) fn new(tv_sec: i64, tv_nsec: i32) -> Self {
+        Self { tv_sec, tv_nsec, _padding: 0 }
+    }
+}
+
+#[cfg(all(
+    target_os = "linux",
+    target_env = "gnu",
+    target_pointer_width = "32",
+    not(target_arch = "riscv32")
+))]
 impl From<__timespec64> for Timespec {
     fn from(t: __timespec64) -> Timespec {
         Timespec::new(t.tv_sec, t.tv_nsec.into())