lkml.org 
[lkml]   [2000]   [Jul]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: Reading a file inside the device driver.
       Date: Wed, 26 Jul 2000 20:09:15 +0100 (BST)
    From: Tigran Aivazian <tigran@veritas.com>

    > There are games you can play to get around this, but such approaches are
    > fragile and complicated, and not what I'd recommend.

    ok, then I'd recommend it instead :)

    Vinay, have a look at how fs/exec.c:sys_uselib() (uselib(2) system
    call) works by using name lookup and then dentry_open() and
    file->f_op->read().

    sys_uselib doesn't actually try to use f_op->read. For that, you have
    to look at kernel_read(); note the magic calls to set_fs(get_ds()) and
    setfs(old_fs). This does work, but it's not something which I suspect
    we want to encourage wide-spread usage of in the kernel.

    In general, it's far better to do file i/o outside the kernel than
    inside the kernel, if it is at all possible.

    - Ted

    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.rutgers.edu
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2005-03-22 13:57    [W:0.020 / U:29.748 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site