get_myaddress problem

[ARQUER Stephane]

Hello,

Thanks for your answer,

After some investigations, I don't think my probleme is in this file.  
The error is caused by an abnormal thread terminaition which cause an  
exit. I have to look for the reason now.

Thanks again.

sa


> Hi,
>
> I had a quick look at this the other day and couldn't see anything
> obvious wrong, but I have put some comments in your email below:
>
>
> ARQUER Stephane wrote:
>> Hello,
>>
>> I'm trying to debug my problem of get_myadress seg fault, I don't    
>> understand something strange:
>>
>> the function  get_myadress use a struct sockaddr_in * as input    
>> parameter : addr.
>>
>> but the struct ifreq doesn't have a struct sockaddr_in field ?
>> The ifr->ifr_addr (ifr->ifr_ifru.ifru_addr) is a struct sockaddr .
>> Is it normal ?
>
> This appears to be normal in the networking code.  sockaddr is defined
> in cpukit/libnetworking/sys/scoket.h as:
>
> struct sockaddr {
> 	unsigned char	sa_len;			/* total length */
> 	sa_family_t	sa_family;		/* address family */
> 	char	sa_data[14];		/* actually longer; address value */
> };
>
> where as sockaddr_in is the internet style of a sockaddr defined in
> cpukit/libnetworking/netinet/in.h as:
>
> /* Socket address, internet style. */
> struct sockaddr_in {
> 	uint8_t	sin_len;
> 	sa_family_t	sin_family;
> 	in_port_t	sin_port;
> 	struct	in_addr sin_addr;
> 	char	sin_zero[8];
> };
>
> In get_myaddress it is cast to the sockaddr_in format, and looking at
> the two structures, the first two elements are the same.
>
> The sockaddr then has an array of 14 chars where sockaddr_in contains
> sin_port which is defined as uint16_t and sin_addr which is a uint32_t
> followed by 8 chars, and if packed would be 14 chars.
>
> The only thing I could think that it could be would be some sort of
> packing issue, but I couldn't really see that the sockaddr would be
> bigger than the sockaddr_in.
>
> regards,
>
> Ian Caddy
>
>
>
> -- 
> Ian Caddy
> Goanna Technologies Pty Ltd
> +61 8 9444 2634



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