=?utf-8?q?Balázs_Kéri?= <balazs.k...@ericsson.com>
Message-ID:
In-Reply-To: <llvm.org/llvm/llvm-project/pull/147...@github.com>
steakhal wrote:
> > BTW wouldn't this patch break the semantics of `freopen`? That one should
> > invalidate the file ptr, right? Could you demonstrate this?
>
> No, `freopen` should _not_ invalidate the file _ptr_, because it modifies the
> stream object (associating it with a different file) _without_ changing the
> pointer identity of the stream object. In fact, if you consider the
> signature, you can see that in
>
> ```c
> FILE *freopen(const char *pathname, const char *mode, FILE *stream);
> ```
>
> the third parameter takes an _rvalue_ of type `FILE *`, so if you call e.g.
> `freopen("somefile.txt", "r", stdin)` then this cannot invalidate the `FILE
> *` pointer stored in the global variable `stdin`.
makes sense, thx
https://github.com/llvm/llvm-project/pull/147766
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