Received Warnings and errors while compiling the Fedora Linux kernel

[Irfan Ahmed <ahm_irf@xxxxxxxxx>]

I am using Fedora Linux 2.6.18. I have updated file ~/linux-2.6.18.2/net/ipv6/tcp_ipv6.c file.
I am working on a project  and at first stage, I need to write the ipsec decrypted packets to disk.
For this reason, I have embeded the following code in "tcp_v6_rcv" function.
    file_desc = open('/testlog.txt',O_WRONLY|O_APPEND);
    file_write_status = write(file_desc,skb->data,skb->len);   
    close(file_desc);

When I compiling the kernel, I received the following warnings and errors
------------------------------------------tcp_ipv6.c---------------------------------------------------------------
[root@localhost linux-2.6.18.2]# make modules
  CHK     include/linux/version.h
  CHK     include/linux/utsrelease.h
  CC [M]  net/ipv6/tcp_ipv6.o
net/ipv6/tcp_ipv6.c: In function ?tcp_v6_rcv?:
net/ipv6/tcp_ipv6.c:1224: warning: implicit declaration of function ?open?
net/ipv6/tcp_ipv6.c:1224:19: warning: character constant too long for its type
net/ipv6/tcp_ipv6.c:1225: warning: implicit declaration of function ?write?
net/ipv6/tcp_ipv6.c:1226: warning: implicit declaration of function ?close?
  LD [M]  net/ipv6/ipv6.o
  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: "close" [net/ipv6/ipv6.ko] undefined!
WARNING: "open" [net/ipv6/ipv6.ko] undefined!
WARNING: "write" [net/ipv6/ipv6.ko] undefined!
  CC      net/ipv6/ipv6.mod.o
  LD [M]  net/ipv6/ipv6.ko
------------------------------------------------------------------------------------------------------------------------------------------------

Any one has any idea about it to solve the warnings.

Regards,

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