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Message-ID: <20230224141731.dm4w7fbfkczbx42e@gen2.localdomain>
Date: Fri, 24 Feb 2023 20:17:31 +0600
From: NRK <nrk@...root.org>
To: Rich Felker <dalias@...c.org>
Cc: musl@...ts.openwall.com, Tamir Duberstein <tamird@...gle.com>
Subject: Re: undefined behavior in fread.c
On Fri, Feb 24, 2023 at 09:07:41AM -0500, Rich Felker wrote:
> stdio functions are required (by POSIX) to behave as if they take a
> mutex on the FILE. If fread with a length of zero makes forward
> progress when another thread holds the lock, this is non-conforming.
OK, I see. Wasn't aware of that.
On a sidenote, if I'm reading the right function (libio/iofread.c) then
glibc is taking the lock _after_ they do the size check.
if (bytes_requested == 0)
return 0;
_IO_acquire_lock (fp);
/* ... */
- NRK
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