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From: mitchmcc on 3 Jul 2008 16:32
I have a simple UDP client program where getsockname appears to be
behaving incorrectly. This is on Solaris 10.

This is more or less what I am doing. You can find many
examples of code like this on the web... I do more error
checking. :-)

struct sockaddr_in server;

server.sin_family = AF_INET;
server.sin_addr.s_addr = htonl(INADDR_ANY);
server.sin_port = htons(0);

/*** Create socket on which to send and receive ***/
sd = socket (AF_INET,SOCK_DGRAM,0);

bind( sd, (SA *) &server, sizeof(server) );

/*** get port information and prints it out ***/
length = sizeof(server);
getsockname (sd, (SA *)&server,&length) );

printf("Server Port is: %d\n", ntohs(server.sin_port));


So I am asking for INADDR_ANY and port 0 initially, which
means "give me any port".

The problem is getsockname is returning 0, which causes
a problem in my application.

Has anyone seen this, or can anyone guess what might
cause it?

I *do* check the return from getsockname, and it is NOT returning
an error.

Thanks,

Mitch


From: Neo - Techpulp on 12 Jul 2008 14:10
On Jul 4, 1:32 am, "mitch...(a)yahoo.com" <mitch...(a)yahoo.com> wrote:
> I have a simple UDP client program where getsockname appears to be
> behaving incorrectly. This is on Solaris 10.
>
> This is more or less what I am doing. You can find many
> examples of code like this on the web... I do more error
> checking. :-)
>
> struct sockaddr_in server;
>
> server.sin_family = AF_INET;
> server.sin_addr.s_addr = htonl(INADDR_ANY);
> server.sin_port = htons(0);
>
> /*** Create socket on which to send and receive ***/
> sd = socket (AF_INET,SOCK_DGRAM,0);
>
> bind( sd, (SA *) &server, sizeof(server) );
>
> /*** get port information and prints it out ***/
> length = sizeof(server);
> getsockname (sd, (SA *)&server,&length) );
>
> printf("Server Port is: %d\n", ntohs(server.sin_port));
>
> So I am asking for INADDR_ANY and port 0 initially, which
> means "give me any port".
>
> The problem is getsockname is returning 0, which causes
> a problem in my application.
>
> Has anyone seen this, or can anyone guess what might
> cause it?
>
> I *do* check the return from getsockname, and it is NOT returning
> an error.
>
> Thanks,
>
> Mitch

Hi Mitch,

There seems to be no error in your code. However you can check the
following article and copy paste the example program and verify if it
works for you.

http://www.techpulp.com/articles/networking/snip-find-local-addr-using-getsockname.php

It works well in Linux. I don't see any reason why it shouldn't work
in Solaris.

- Neo
Techpulp Technologies
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