From: Andreas Schwab <schwab@suse.de>
To: Joe Simmons-Talbott <josimmon@redhat.com>
Cc: libc-alpha@sourceware.org
Subject: Re: [PATCH] nss: Get rid of alloca usage in makedb's write_output.
Date: Thu, 28 Sep 2023 15:32:31 +0200 [thread overview]
Message-ID: <mvmmsx6pgnk.fsf@suse.de> (raw)
In-Reply-To: <20230928131432.GB4098455@oak> (Joe Simmons-Talbott's message of "Thu, 28 Sep 2023 09:14:32 -0400")
On Sep 28 2023, Joe Simmons-Talbott wrote:
> On Thu, Sep 28, 2023 at 01:16:00PM +0200, Andreas Schwab wrote:
>> On Sep 26 2023, Joe Simmons-Talbott wrote:
>>
>> > @@ -802,6 +812,7 @@ write_output (int fd)
>> > assert (iov_nelts <= INT_MAX);
>> > if (writev (fd, iov, iov_nelts) != keydataoffset)
>> > {
>> > + scratch_buffer_free (&sbuf);
>> > error (0, errno, gettext ("failed to write new database file"));
>> > return EXIT_FAILURE;
>>
>> Does scratch_buffer_free guarantee that errno is not changed?
>
> scratch_buffer_free doesn't do anything other than call free when the
> buffer has been heap-allocated. IIUC free preserves errno since 2.33 in
> the default free. So I guess if there is a non-default free that
> doesn't preserve errno then there is no explicit guarantee. Should I
> adjust scratch_buffer_free to explicitly preserve errno (in a separate
> patch) or just preserve errno around this one call to
> scratch_buffer_free?
You could just move the call down.
--
Andreas Schwab, SUSE Labs, schwab@suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."
next prev parent reply other threads:[~2023-09-28 13:32 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-26 13:54 Joe Simmons-Talbott
2023-09-28 11:16 ` Andreas Schwab
2023-09-28 13:14 ` Joe Simmons-Talbott
2023-09-28 13:32 ` Andreas Schwab [this message]
2023-09-28 15:52 ` Gabriel Ravier
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