On Sep 7, 10:02 pm, HISONA <hison...@gmail.com> wrote:
> When, I call recvfrom function, but "struct sockaddr *addr" parameter
> returns NULL value.
[...]
> int udp_read(int socket_no, char *str, int len, struct sockaddr
> *addr)
> {
> int read;
>
> return recvfrom(socket_no, str, len, 0, addr, &read);
The last argument is a value-result parameter ("fromlen") that should
hold sizeof(struct sockaddr) on entry. You're passing in an
uninitialized value. This will work or not depending on what value
happens to be passed in.
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