From 855570b229f1d23e4ed39df9a8d916b7a3943955 Mon Sep 17 00:00:00 2001
From: usamoi <usamoi@outlook.com>
Date: Tue, 7 Oct 2025 16:51:16 +0800
Subject: [PATCH 1/2] fix compilation on uefi targets

Signed-off-by: usamoi <usamoi@outlook.com>
---
 rand_core/src/os.rs | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/rand_core/src/os.rs b/rand_core/src/os.rs
index 49111632d9f..dc4125c9604 100644
--- a/rand_core/src/os.rs
+++ b/rand_core/src/os.rs
@@ -66,6 +66,14 @@ impl std::error::Error for OsError {
     }
 }
 
+// If [`RawOsError`](https://doc.rust-lang.org/std/io/type.RawOsError.html) is stablized, we can use it.
+
+#[cfg(not(target_os = "uefi"))]
+type RawOsError = i32;
+
+#[cfg(target_os = "uefi")]
+type RawOsError = usize;
+
 impl OsError {
     /// Extract the raw OS error code (if this error came from the OS)
     ///
@@ -75,7 +83,7 @@ impl OsError {
     ///
     /// [1]: https://doc.rust-lang.org/std/io/struct.Error.html#method.raw_os_error
     #[inline]
-    pub fn raw_os_error(self) -> Option<i32> {
+    pub fn raw_os_error(self) -> Option<RawOsError> {
         self.0.raw_os_error()
     }
 }

From 23fe09be63dec2cedc24c3d8f77b7e4634f59a2f Mon Sep 17 00:00:00 2001
From: usamoi <usamoi@outlook.com>
Date: Wed, 15 Oct 2025 21:04:18 +0800
Subject: [PATCH 2/2] add changelog

---
 rand_core/CHANGELOG.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/rand_core/CHANGELOG.md b/rand_core/CHANGELOG.md
index a060625114f..ee1b45d0579 100644
--- a/rand_core/CHANGELOG.md
+++ b/rand_core/CHANGELOG.md
@@ -7,6 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## Unreleased
 ### API changes
 - Relax `Sized` bound on impls of `SeedableRng` (#1641)
+- Fix `OsError::raw_os_error` on UEFI targets by returning `Option<usize>` (#1665)
 
 ## [0.9.3] — 2025-02-29
 ### Other