Messages in this thread |  | | Subject | Re: Floppy disk strange behavior | Date | Tue, 9 Jan 2001 21:37:07 +0000 (GMT) | From | Alan Cox <> |
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> dd bug. It tries to ftruncate() the output file and gets all upset when > kernel refuses to truncate a block device (surprise, surprise).
Standards compliant but unexpected.
> Basically, dd(1) expects kernel to fake success for ftruncate() on the > things that can't be truncated. Bad idea. 2.2 didn't bother to report
Actually its explicitly mentioned by the spec that truncate _may_ extend a file but need not do so.
> Try to build GNU dd on other Unices and you will be able to trigger that > bug on quite a few of them.
I think not
> ftruncate(2) is _not_ supposed to succeed on anything other than regular > files. I.e. dd(1) should not call it and expect success if file is not > regular. Plain and simple...
2.2 is least suprise 2.4 is most information, but misleading errno IMHO
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