Re: help with a simple C program
On Sat, Jun 03, 2000 at 11:58:50PM +1000, Shao Zhang wrote:
> Hi,
> Could anyone explain to me why the following C program always fails?
> I mean the setsockopt always fails. Thanks for the help.
>
> Thanks for any help in advance.
>
> Regards,
>
>
> Shao.
>
>
> =====cut here======
> #include <stdio.h>
> #include <stdlib.h>
> #include <sys/socket.h>
> #include <sys/types.h>
> int main(void)
> {
> int sd, error;
> const char f = 1;
^^^^^^^^^^ (make it an int)
>
> sd = socket(AF_INET, SOCK_DGRAM, 0); /* 0 for IP protocol */
> error = setsockopt(sd, SOL_SOCKET, SO_BROADCAST, (char *) &f, 1);
^^^^^^^^^^^^^^
no cast,
sizeof(f)
> if (error == -1)
> printf("setsockopt on %d failed!!\n", sd);
>
> close(sd);
> return 0;
> }
Realize, I could be wrong (but those changes made it work here).
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