[libc-commits] [libc] [libc] Add sys/ucontext.h header (PR #194329)

[via libc-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-libc

Author: Jeff Bailey (kaladron)

<details>
<summary>Changes</summary>

POSIX historically provided <sys/ucontext.h> as an alias for <ucontext.h>. Some software still includes the sys/ path. Added the header as a simple wrapper that includes <ucontext.h>, gated to x86_64 alongside the existing ucontext support.

---
Full diff: https://github.com/llvm/llvm-project/pull/194329.diff


3 Files Affected:

- (modified) libc/config/linux/x86_64/headers.txt (+1) 
- (modified) libc/include/CMakeLists.txt (+6) 
- (added) libc/include/sys/ucontext.h (+14) 


``````````diff
diff --git a/libc/config/linux/x86_64/headers.txt b/libc/config/linux/x86_64/headers.txt
index 2b93c84b13b5f..fb461444b43d8 100644
--- a/libc/config/linux/x86_64/headers.txt
+++ b/libc/config/linux/x86_64/headers.txt
@@ -53,6 +53,7 @@ set(TARGET_PUBLIC_HEADERS
     libc.include.sys_syscall
     libc.include.sys_time
     libc.include.sys_types
+    libc.include.sys_ucontext
     libc.include.sys_un
     libc.include.sys_utsname
     libc.include.sys_wait
diff --git a/libc/include/CMakeLists.txt b/libc/include/CMakeLists.txt
index 6c5ecac302dc8..38e0c435006b7 100644
--- a/libc/include/CMakeLists.txt
+++ b/libc/include/CMakeLists.txt
@@ -476,6 +476,12 @@ if(LIBC_TARGET_ARCHITECTURE STREQUAL "x86_64")
       .llvm-libc-types.sigset_t
       .llvm-libc-types.stack_t
   )
+
+  add_header(
+    sys_ucontext
+    HDR
+      sys/ucontext.h
+  )
 endif()
 
 add_header_macro(
diff --git a/libc/include/sys/ucontext.h b/libc/include/sys/ucontext.h
new file mode 100644
index 0000000000000..7f0b830434475
--- /dev/null
+++ b/libc/include/sys/ucontext.h
@@ -0,0 +1,14 @@
+//===-- POSIX header sys/ucontext.h ---------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SYS_UCONTEXT_H
+#define LLVM_LIBC_SYS_UCONTEXT_H
+
+#include <ucontext.h>
+
+#endif // LLVM_LIBC_SYS_UCONTEXT_H

``````````

</details>


https://github.com/llvm/llvm-project/pull/194329