[llvm-branch-commits] [sanitizer] Add TryMemCpy (PR #112668)

[Florian Mayer via llvm-branch-commits]

================
@@ -325,6 +325,44 @@ bool IsAccessibleMemoryRange(uptr beg, uptr size) {
   return true;
 }
 
+bool TryMemCpy(void *dest, const void *src, uptr n) {
+  int sock_pair[2];
+  if (pipe(sock_pair))
+    return false;
+
+  auto cleanup = at_scope_exit([&]() {
+    internal_close(sock_pair[0]);
+    internal_close(sock_pair[1]);
+  });
+
+  SetNonBlock(sock_pair[0]);
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fmayer wrote:

Actually maybe not. Because we always read after writing, so there should always be space in the buffer for writing, and always be data for reading.

But we need to handle EINTR.

https://github.com/llvm/llvm-project/pull/112668