Add 64-bit time_t support on 32-bit glibc Linux to set_times

Author: beetrees

library/std/src/sys/unix/fs.rs

@@ -1192,8 +1192,6 @@ impl File {
                 None => Ok(libc::timespec { tv_sec: 0, tv_nsec: libc::UTIME_OMIT as _ }),
             }
         };
-        #[cfg(not(any(target_os = "redox", target_os = "espidf", target_os = "horizon")))]
-        let times = [to_timespec(times.accessed)?, to_timespec(times.modified)?];
         cfg_if::cfg_if! {
             if #[cfg(any(target_os = "redox", target_os = "espidf", target_os = "horizon"))] {
                 // Redox doesn't appear to support `UTIME_OMIT`.
@@ -1205,6 +1203,7 @@ impl File {
                     "setting file times not supported",
                 ))
             } else if #[cfg(any(target_os = "android", target_os = "macos"))] {
+                let times = [to_timespec(times.accessed)?, to_timespec(times.modified)?];
                 // futimens requires macOS 10.13, and Android API level 19
                 cvt(unsafe {
                     weak!(fn futimens(c_int, *const libc::timespec) -> c_int);
@@ -1231,6 +1230,22 @@ impl File {
                 })?;
                 Ok(())
             } else {
+                #[cfg(all(target_os = "linux", target_env = "gnu", target_pointer_width = "32", not(target_arch = "riscv32")))]
+                {
+                    use crate::sys::{time::__timespec64, weak::weak};
+
+                    // Added in glibc 2.34
+                    weak!(fn __futimens64(libc::c_int, *const __timespec64) -> libc::c_int);
+
+                    if let Some(futimens64) = __futimens64.get() {
+                        let to_timespec = |time: Option<SystemTime>| time.map(|time| time.t.to_timespec64())
+                            .unwrap_or(__timespec64::new(0, libc::UTIME_OMIT as _));
+                        let times = [to_timespec(times.accessed), to_timespec(times.modified)];
+                        cvt(unsafe { futimens64(self.as_raw_fd(), times.as_ptr()) })?;
+                        return Ok(());
+                    }
+                }
+                let times = [to_timespec(times.accessed)?, to_timespec(times.modified)?];
                 cvt(unsafe { libc::futimens(self.as_raw_fd(), times.as_ptr()) })?;
                 Ok(())
             }

library/std/src/sys/unix/time.rs

@@ -166,6 +166,16 @@ 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 {
@@ -190,6 +200,18 @@ pub(in crate::sys::unix) struct __timespec64 {
     _padding: i32,
 }
 
+#[cfg(all(
+    target_os = "linux",
+    target_env = "gnu",
+    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",