[KinoSearch] KinoSearch Death
marvin at rectangular.com
Fri Oct 20 05:18:36 PDT 2006
On Oct 20, 2006, at 4:55 AM, Aaron Crane wrote:
> Marvin Humphrey writes:
>> When PerlIO_read fails, it's supposed to set errno to a positive
>> number indicating the type of error that occurred -- just like the
>> stdio function fread(). Here's a snippet from its documentation in
>> Returns a byte count if successful (which may be zero or
>> returns negative value and sets errno on error.
>> So, it looks like we've tickled a bug in PerlIO_read. It thinks it
>> succeeded by giving us 0 bytes, even though we asked for 1024.
> I strongly suspect that's not a bug in PerlIO_read. If PerlIO_read()
> really is like stdio fread() (or POSIX read(), for that matter), it's
> designed to treat a short read as success. That is, the read
> returns as
> many bytes as you asked for, or as many as were available,
> whichever is
> less. In particular, if you attempt to read from a file when there
> no more bytes of the file left to read, that gives you a successful
> of 0 bytes -- an EOF condition.
Mmmf, yeah, good catch, you're right. I wonder how that squares with
the NFS sync hypothesis.
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