Messages in this thread | | | Date | Wed, 6 Jun 2007 16:04:40 -0700 (PDT) | From | Davide Libenzi <> | Subject | Re: [patch 7/8] fdmap v2 - implement sys_socket2 |
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On Wed, 6 Jun 2007, Alan Cox wrote:
> > The sys_accept() system call has been modified to return a file > > descriptor inside the non-sequential area, if the listening fd is. > > The sys_socketcall() system call has been also changed to support > > a new SYS_SOCKET2 indentifier. > > This still all seems really really ugly. Is there anything wrong with > throwing all these extra cases out and replacing the entire lot with > > prctl(PR_SPARSEFD, 1); > > to turn on sparse fd allocation for a process ?
There was a little discussion where I tried to whisper something similar, but Linus and Uli shot me :) - with good reasons IMO. You may link to runtimes that are not non-sequentialfd aware, and will break them.
> Anyone needing to deal with certain special fds will use dup2() anyway so > a task global switch seems to be cleaner and make the behaviour simply to > flip on, with no extra calls (and you need to submit man pages for them > all too), and also more importantly no new glibc stuff should be needed, > and a process can try to set sparsefd, fail and carry on so its more > portable and back portable.
Man pages! Damn, I forgot Michael Kerrisk is already waiting for the other stuff :(
- Davide
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