Hi all,
What is the purpose of the padding in this function?
static struct udp_connection * udp_demux ( struct sockaddr_tcpip *local ) {
static const struct sockaddr_tcpip empty_sockaddr = { .pad = {
0, } };
struct udp_connection *udp;
list_for_each_entry ( udp, &udp_conns, list ) {
if ( ( ( udp->local.st_family ==
local->st_family ) ||
( udp->local.st_family == 0 ) ) &&
( ( udp->local.st_port == local->st_port )
||
( udp->local.st_port == 0 ) ) &&
( ( memcmp ( udp->local.pad, local->pad,
sizeof (
udp->local.pad ) ) == 0 ) ||
( memcmp ( udp->local.pad,
empty_sockaddr.pad,
sizeof (
udp->local.pad ) ) == 0 ) ) ) {
return udp;
}
}
return NULL;
}
What is the purpose of these checks in the expression?
( ( memcmp ( udp->local.pad, local->pad,
sizeof ( udp->local.pad ) ) == 0 ) ||
( memcmp ( udp->local.pad, empty_sockaddr.pad,
sizeof ( udp->local.pad ) ) == 0 ) ) ) {
Thanks,
Wissam
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