which buffer address is this ?

[g_siddu]

found out its the inet6 or ipv6 address :)

Hello All,

I was running strace over  ifconfig command  and part of the output is shown
below . I notice something strange in the length of the buffer address of
the  read syscall . *Can somebody throw some light on this ?*

open("/proc/net/if_inet6", O_RDONLY)    = 10
fstat64(10, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0xb7ce8000
*read(10, "fe80000000000000021676fffe79ceb2"..., 1024) = 108*


write(1, "          inet6 addr: fe80::216:"..., 61          inet6 addr:
fe80::216:76ff:fe79:ceb2/64 Scope:Link
) = 61
read(10, "", 1024)                      = 0
read(10, "", 1024)                      = 0
close(10)                               = 0

--
Regards,
~Sid~
http://sidsenclave.blogspot.com



--
Regards,
~Sid~
http://sidsenclave.blogspot.com



--
Regards,
~Sid~
http://sidsenclave.blogspot.com


[Non-text portions of this message have been removed]

[uma-8]

Hi Siddu,

I guess the three dots, followed by some string, in second argument of
read() represents variable arguments.
Return value of read() should match the length of the buffer anyway.

thanks,
uma..


On Wed, Jul 15, 2009 at 8:03 PM, Siddu <siddu.sjce@...> wrote:

> found out its the inet6 or ipv6 address :)
>
> Hello All,
>
> I was running strace over  ifconfig command  and part of the output is
> shown
> below . I notice something strange in the length of the buffer address of
> the  read syscall . *Can somebody throw some light on this ?*
>
> open("/proc/net/if_inet6", O_RDONLY)    = 10
> fstat64(10, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
> mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0xb7ce8000
> *read(10, "fe80000000000000021676fffe79ceb2"..., 1024) = 108*
>
>
> write(1, "          inet6 addr: fe80::216:"..., 61          inet6 addr:
> fe80::216:76ff:fe79:ceb2/64 Scope:Link
> ) = 61
> read(10, "", 1024)                      = 0
> read(10, "", 1024)                      = 0
> close(10)                               = 0
>
> --
> Regards,
> ~Sid~
> http://sidsenclave.blogspot.com
>
>
>
> --
> Regards,
> ~Sid~
> http://sidsenclave.blogspot.com
>
>
>
> --
> Regards,
> ~Sid~
> http://sidsenclave.blogspot.com
>
>
> [Non-text portions of this message have been removed]
>
>
>
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>
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[Non-text portions of this message have been removed]