Re: Re Where should I declare the global variable

[kanishk rastogi <kanishk_rastogi85@xxxxxxxxx>]

----- Original Message ----
From: pradeep singh <2500.pradeep@xxxxxxxxx>
To: kanishk rastogi <kanishk_rastogi85@xxxxxxxxx>
Sent: Friday, May 4, 2007 10:38:58 AM
Subject: Re: Re Where should I declare the global variable

rusty i cannot see your message. :-(
did you send an empty message??

~rautela
On 5/4/07, kanishk rastogi <kanishk_rastogi85@xxxxxxxxx> wrote:
>
>
>
>
>
> ----- Original Message ----
> From: Irfan Ahmed <ahm_irf@xxxxxxxxx>
> To: kernelnewbies@xxxxxxxxxxxx
> Sent: Friday, May 4, 2007 9:13:02 AM
> Subject: Where should I declare the global variable
>
>
> Hi,
>
>
>  I am need to use one global variable in two files.
>  One is ~/net/ipv6/tcp_ipv6.c where I have defined the global variable as
> extern int global_fd;
>  Second is my custom system call code. Its code is as follows
>  __________
>  #include<linux/linkage.h>
>  #include<linux/kernel.h>
>
>  int global_fd;
>
>  asmlinkage int sys_mycall(int fd)
>  {
>  global_fd = fd;
>  return fd;
>  }
>  ___________
>

where is this code getting compiled

> where is this code
> is it getting compiled
>

>
>  Now I am still getting the follwing error
>  ___________________________
>  CHK include/linux/version.h
>  CHK include/linux/utsrelease.h
>  Building modules, stage 2.
>  MODPOST
>  WARNING: drivers/atm/he.o - Section mismatch: reference to .init.text: from
> .text between 'he_start' (at offset 0x2074) and 'he_service_tbrq'
>  WARNING: "global_fd" [net/ipv6/ipv6.ko] undefined!
>  WARNING: "sys_write" [net/ipv6/ipv6.ko] undefined!
>  [root@localhost linux-2.6.18.2]#
>  ________________
>
>  Anther thing that I want to ask about sys_write . Can I use it in kernel
> code other than kernel module. and how can I solve the undefined problem of
> sys_write even I have also added the syscalls.h header file.
>
>  Regards,
>
>  Irfan
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