[syslinux] isohybrid: seek error - 6: Invalid argument

[H. Peter Anvin]

By the way, using seek + write for this is pretty broken.  A much better 
option is to use ftruncate().

	-hpa


On 09/12/2010 10:25 PM, P J P wrote:
>     Hello Gerardo,
>
> --- On Mon, 13/9/10, Gerardo Exequiel Pozzi<vmlinuz386 at yahoo.com.ar>
>> Recently while playing with bigger iso images (>2G)
>> looks like isohybrid from syslinux-4.02 fails. Sometimes
>> tunning heads/sectors (-h/-s) works, because no padding is
>> needed depending of size of the image.
>>
>> isohybrid: pandereta-2010.09.13-i686.iso: seek error - 6:
>> Invalid argument
>
>    Thanks for the update. The error seems to come while seeking(fseek(3)) to fix the file pointer at the end of the file, just before adding required padding to the iso.
>
> ---
>      if (fseek(fp, isostat.st_size, SEEK_SET))
>          err(1, "%s: seek error - 6", argv[0]);
>
>      memset(buf, 0, padding);
>      if (fwrite(buf, sizeof(char), padding, fp) != (size_t)padding)
>          err(1, "%s: write error - 2", argv[0]);
> ---
>
> Strange, that it should happen. I guess, may be, HPA could be better able to explain why it should happen for 2G files.
>
> Can I have the iso file?
>
> Thank you.
> ---
> Regards
>      -Prasad
> PS: Please don't send me html/attachment/Fwd mails
>
>
>