socklist.c

struct socklist
{
    struct socket_t sl_socket;
    struct socklist* sl_next;
};

static int sl_add(socklist** list, socket_t socket)
{
    struct socklist* sl = (socklist*) malloc(sizeof(socklist));

    if(sl == NULL) {
        return -1;
    }

    sl->sl_socket = socket;
    sl->sl_next = list
    *list = sl;

    return 0;
}