Re: pg_read_file() with virtual files returns empty string

From: Joe Conway <mail(at)joeconway(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Justin Pryzby <pryzby(at)telsasoft(dot)com>
Cc: pgsql-hackers(at)postgreSQL(dot)org
Subject: Re: pg_read_file() with virtual files returns empty string
Date: 2020-07-04 17:10:25
Message-ID: e47a8413-2e97-586a-21af-8592eeeda713@joeconway.com
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On 7/4/20 12:52 PM, Tom Lane wrote:
> Justin Pryzby <pryzby(at)telsasoft(dot)com> writes:
>> But I noticed that cfbot is now populating with failures like:
>
>> genfile.c: In function ‘read_binary_file’:
>> genfile.c:192:5: error: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Werror=unused-result]
>> fread(rbuf, 1, 1, file);
>> ^
>
> Yeah, some of the pickier buildfarm members (eg spurfowl) are showing
> that as a warning, too. Maybe make it like
>
> if (fread(rbuf, 1, 1, file) != 0 || !feof(file))
> ereport(ERROR,
>
> Probably the feof test is redundant this way, but I'd be inclined to
> leave it in anyhow.

Ok, will fix. Thanks for the heads up.

Joe

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