Apply deny(unsafe_op_in_unsafe_fn) to all of sys/unsupported.

4 files changed, 10 insertions, 9 deletions

diff --git a/library/std/src/sys/unsupported/common.rs b/library/std/src/sys/unsupported/common.rs
index 80311d26819..2cdd9c4d19e 100644
--- a/library/std/src/sys/unsupported/common.rs
+++ b/library/std/src/sys/unsupported/common.rs
@@ -39,10 +39,13 @@ pub fn hashmap_random_keys() -> (u64, u64) {
 pub enum Void {}
 
 pub unsafe fn strlen(mut s: *const c_char) -> usize {
-    let mut n = 0;
-    while *s != 0 {
-        n += 1;
-        s = s.offset(1);
+    // SAFETY: The caller must guarantee `s` points to a valid 0-terminated string.
+    unsafe {
+        let mut n = 0;
+        while *s != 0 {
+            n += 1;
+            s = s.offset(1);
+        }
+        n
     }
-    return n;
 }
diff --git a/library/std/src/sys/unsupported/mod.rs b/library/std/src/sys/unsupported/mod.rs
index 8ba870c5dbc..d9efdec33d9 100644
--- a/library/std/src/sys/unsupported/mod.rs
+++ b/library/std/src/sys/unsupported/mod.rs
@@ -1,3 +1,5 @@
+#![deny(unsafe_op_in_unsafe_fn)]
+
 pub mod alloc;
 pub mod args;
 pub mod cmath;
diff --git a/library/std/src/sys/unsupported/mutex.rs b/library/std/src/sys/unsupported/mutex.rs
index 0e01edcaf39..3b97d0875bd 100644
--- a/library/std/src/sys/unsupported/mutex.rs
+++ b/library/std/src/sys/unsupported/mutex.rs
@@ -1,5 +1,3 @@
-#![deny(unsafe_op_in_unsafe_fn)]
-
 use crate::cell::Cell;
 
 pub struct Mutex {
diff --git a/library/std/src/sys/unsupported/rwlock.rs b/library/std/src/sys/unsupported/rwlock.rs
index 4e4f0f00f69..1a9c266196f 100644
--- a/library/std/src/sys/unsupported/rwlock.rs
+++ b/library/std/src/sys/unsupported/rwlock.rs
@@ -1,5 +1,3 @@
-#![deny(unsafe_op_in_unsafe_fn)]
-
 use crate::cell::Cell;
 
 pub struct RWLock {