Date: Mon, 17 Apr 1995 07:31:03 +1000 From: Bruce Evans <bde@zeta.org.au> To: j@uriah.heep.sax.de, rpt@miles.sso.loral.com Cc: andreas@knobel.gun.de, hackers@FreeBSD.org Subject: Re: aspfilter & stdin Message-ID: <199504162131.HAA17611@godzilla.zeta.org.au>
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>[trying to get apsfilter to work on FreeBSD]
>> ... A companion program is supplied called 'rewindstdin'.
>>
>> main()
>> {
>> return lseek(0,0L,0) < 0;
>> }
>I've already wondered how this should work on a pipe after Andreas
>described it to me on the phone. I'd suggest you to contact Andreas
It must fail on pipes and set errno to ESPIPE.
I'm currently looking at a bug involving lseek() not failing on named
pipes. Ordinary pipes are handled correctly in vfs_syscalls.c:lseek()
because fp->f_type is DTYPE_SOCKET for them. For named pipes,
fp->f_type is DTYPE_VNODE (this seems appropriate because there really
is a vnode) so lseek() does the wrong thing. There are probably other
places where named pipes should be handled like ordinary pipes (mostly
in kern_descrip.c).
File timestamps are broken for both ordinary pipes and named pipes.
Bruce
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