================
@@ -122,8 +123,14 @@ struct ForkLaunchInfo {
ExitWithError(error_fd, "close");
break;
case FileAction::eFileActionDuplicate:
- if (dup2(action.fd, action.arg) == -1)
- ExitWithError(error_fd, "dup2");
+ if (action.fd != action.arg) {
----------------
labath wrote:
This says "I want to pass `action.fd` from *my* process as `action.arg` to the
*new* process". They're the same if the caller specifies them as such, except
that we now have special handling to ensure that the O_CLOEXEC flag is cleared
in the new process (and only in that process).
https://github.com/llvm/llvm-project/pull/126935
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