From: NRK <nrk@disroot.org>
To: Rich Felker <dalias@libc.org>
Cc: musl@lists.openwall.com, Tamir Duberstein <tamird@google.com>
Subject: Re: [musl] undefined behavior in fread.c
Date: Fri, 24 Feb 2023 20:17:31 +0600 [thread overview]
Message-ID: <20230224141731.dm4w7fbfkczbx42e@gen2.localdomain> (raw)
In-Reply-To: <20230224140739.GF4163@brightrain.aerifal.cx>
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
next prev parent reply other threads:[~2023-02-24 14:17 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-24 12:52 Tamir Duberstein
2023-02-24 13:34 ` Rich Felker
2023-02-24 13:53 ` Jₑₙₛ Gustedt
2023-02-24 13:55 ` NRK
2023-02-24 14:07 ` Rich Felker
2023-02-24 14:17 ` NRK [this message]
2023-02-24 14:42 ` Tamir Duberstein
2023-02-24 15:13 ` NRK
2023-02-24 16:12 ` Tamir Duberstein
2023-02-24 16:40 ` Jₑₙₛ Gustedt
2023-02-24 16:42 ` Tamir Duberstein
2023-02-24 17:00 ` Jₑₙₛ Gustedt
2023-02-24 17:07 ` enh
2023-02-24 17:32 ` Tamir Duberstein
2023-02-24 16:42 ` enh
2023-02-24 20:07 ` Rich Felker
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