Auto merge of #103739 - Mark-Simulacrum:beta-next, r=Mark-Simulacrum

[beta] backport rollup

* poll_fn and Unpin: fix pinning #102737
* Support raw-dylib functions being used inside inlined functions #102988
* Fix line numbers for MIR inlined code #103071
* Add architectures to fn create_object_file #103240
* Add eval hack in super_relate_consts back #103279
* Mark std::os::wasi::io::AsFd etc. as stable. #103308
* Truncate thread names on Linux and Apple targets #103379
* Do not consider repeated lifetime params for elision. #103450
* rustdoc: add missing URL redirect #103588
* Remove commit_if_ok probe from NLL type relation #103601

Also includes a copy of the release notes.

r? `@ghost`

1 files changed, 18 insertions, 0 deletions

diff --git a/library/std/src/sys/unix/thread.rs b/library/std/src/sys/unix/thread.rs
index 56bb71b5dcb..f6b627afc12 100644
--- a/library/std/src/sys/unix/thread.rs
+++ b/library/std/src/sys/unix/thread.rs
@@ -132,8 +132,11 @@ impl Thread {
 
     #[cfg(target_os = "linux")]
     pub fn set_name(name: &CStr) {
+        const TASK_COMM_LEN: usize = 16;
+
         unsafe {
             // Available since glibc 2.12, musl 1.1.16, and uClibc 1.0.20.
+            let name = truncate_cstr(name, TASK_COMM_LEN);
             libc::pthread_setname_np(libc::pthread_self(), name.as_ptr());
         }
     }
@@ -148,6 +151,7 @@ impl Thread {
     #[cfg(any(target_os = "macos", target_os = "ios", target_os = "watchos"))]
     pub fn set_name(name: &CStr) {
         unsafe {
+            let name = truncate_cstr(name, libc::MAXTHREADNAMESIZE);
             libc::pthread_setname_np(name.as_ptr());
         }
     }
@@ -277,6 +281,20 @@ impl Drop for Thread {
     }
 }
 
+#[cfg(any(target_os = "linux", target_os = "macos", target_os = "ios", target_os = "watchos"))]
+fn truncate_cstr(cstr: &CStr, max_with_nul: usize) -> crate::borrow::Cow<'_, CStr> {
+    use crate::{borrow::Cow, ffi::CString};
+
+    if cstr.to_bytes_with_nul().len() > max_with_nul {
+        let bytes = cstr.to_bytes()[..max_with_nul - 1].to_vec();
+        // SAFETY: the non-nul bytes came straight from a CStr.
+        // (CString will add the terminating nul.)
+        Cow::Owned(unsafe { CString::from_vec_unchecked(bytes) })
+    } else {
+        Cow::Borrowed(cstr)
+    }
+}
+
 pub fn available_parallelism() -> io::Result<NonZeroUsize> {
     cfg_if::cfg_if! {
         if #[cfg(any(