On Thu, Sep 30, 2004 at 19:50:18 +0530, Rakesh Jagota wrote:
> Hello All,
>
> I developed on kernel module which provides wrapper functions to all sys_*
> funtions related to sockets. With this i developed one application , and i
> could run TCP server which is communicating with TCP client on the other
> m/c.
>
> Now Developed one kernel module (instead of application in the earlier
> case)for TCP server (now Kernel module) . when the server is executing the
> bind function
> it has given Error No -14.
>
> I know that It is accessing bad area. Any suggestions.
First, errno 14 is Bad Address. In kernel, errno values are negative.
Now, I have two suggestions:
1) Don't use syscalls from kernel. Use the sock_* functions directly.
2) If you have to call a syscall, or any other function that does
copy_to/from_user with data in kernel, do:
mm_segment_t oldfs = get_fs();
set_fs(KERNEL_DS);
<do-the-call-here>
set_fs(oldfs);
In fact, even if you avoid calling syscalls, read and write (and send,
recv etc...) file/socket methods will still need this, because they
copy_to/from_user.
-------------------------------------------------------------------------------
Jan 'Bulb' Hudec <bulb@xxxxxx>
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