I am writing a simple client using UDP sockets.
I am wondering if there is any way to determine what local port a
socket was bound to when bind() is not explicitly called.

This is what my program looks like:

sock = socket(PF_INET, SOCK_DGRAM, 0);
sendto(sock, message, strlen(message) + 1, 0, (struct sockaddr *)
&server, sizeof(server));

Note that bind() was not called, and the socket was arbitrarily(?)
bound to a local port by the kernel. How do I determine what port it
was bound to?

Thanks.
Anket Mathur

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anketm@gmail.com writes:

> I am writing a simple client using UDP sockets.
> I am wondering if there is any way to determine what local port a
> socket was bound to when bind() is not explicitly called.
>
> This is what my program looks like:
>
> sock = socket(PF_INET, SOCK_DGRAM, 0);
> sendto(sock, message, strlen(message) + 1, 0, (struct sockaddr *)
>                &server, sizeof(server));
>
> Note that bind() was not called, and the socket was arbitrarily(?)
> bound to a local port by the kernel. How do I determine what port it
> was bound to?

getsockname

--
Måns Rullgård
mru@inprovide.com

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