[PATCH 2/2] libio: Perform write-only fflush as part of freopen (bug 30731)
Andreas Schwab
schwab@suse.de
Tue Aug 8 13:49:22 GMT 2023
On Aug 08 2023, Florian Weimer via Libc-alpha wrote:
> For standard streams that have a file descriptor, the read flush
> may change the file offset of the underlying file descriptor. This
> is undeseriable because it makes using freopen after fork unsafe
> even for read-only files.
The POSIX standard says that fflush should be called unconditionally,
which means that it expects all side effects to happen.
--
Andreas Schwab, SUSE Labs, schwab@suse.de
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"And now for something completely different."
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