Rollup merge of #110093 - beetrees:set-times-32-bit, r=joshtriplett

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

Add support to `set_times` for 64-bit `time_t` on 32-bit glibc Linux platforms which have a 32-bit `time_t`. Split from #109773.

Tracking issue: #98245

1 files changed, 17 insertions, 2 deletions

diff --git a/library/std/src/sys/unix/fs.rs b/library/std/src/sys/unix/fs.rs
index abef170dd5a..2a5a14209a1 100644
--- a/library/std/src/sys/unix/fs.rs
+++ b/library/std/src/sys/unix/fs.rs
@@ -1193,8 +1193,6 @@ 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`.
@@ -1206,6 +1204,7 @@ 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);
@@ -1232,6 +1231,22 @@ 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(())
             }