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    SubjectRe: [patch 7/8] fdmap v2 - implement sys_socket2
    On Wed, 6 Jun 2007, David Miller wrote:

    > From: Davide Libenzi <davidel@xmailserver.org>
    > Date: Wed, 06 Jun 2007 15:30:31 -0700
    >
    > > This patch implement a new syscall sys_socket2(), that accepts an
    > > extra "flags" parameter:
    > >
    > > int socket2(int domain, int type, int protocol, int flags);
    > >
    > > The flags parameter is used to pass extra flags to the kernel, and is
    > > at the moment used to select the file descriptor allocations inside
    > > the non-sequential area (O_NONSEQFD). The remaining parameters are
    > > exactly the same as the ones of sys_socket().
    > > 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.
    > >
    > > Signed-off-by: Davide Libenzi <davidel@xmailserver.org>
    >
    > Since the valid range of "domain" values is quite small,
    > we could avoid the new system call by cribbing some of the
    > upper bits of the 'domain' argument.
    >
    > Valid existing programs pass in valid 'domain' values and
    > thus will not set any of the new flags.
    >
    > Just an idea.

    I have no huge preferences. If not the slight one of using the same flags
    for open() and socket{2}() (O_NONSEQFD). If we overload socket() we may
    need to fight with existing O_* flags. OTOH the current free ones are
    pretty high in bits, so it may be OK too.



    - Davide


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