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Date: Thu, 5 Sep 2019 19:29:04 +0200
From: Markus Wichmann <>
Subject: Re: About those weak aliases

On Thu, Sep 05, 2019 at 06:58:22PM +0200, Szabolcs Nagy wrote:
> can you show an example use of open in musl code
> where it is called form an api implementation
> that is defined by iso c?

No, I can't. And I think I understand now.

musl is trying to prevent linker errors from namespace pollution. More
specifically, to prevent double definition errors. Such an error would
happen during static linking, if a strong symbol from an unrelated
standard were pulled in. To that end, weak aliases are handed out on an
as-needed basis. open() is not needed to implement any interface from a
standard it is not a part of (fopen() inlines the syscall), so it gets
no alias. mmap() is needed to implement malloc(), so it gets one. Repeat
for all other functions.

How close am I?


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