alternative.c

int netaccept(int fd, char *server, int *port)
{
    int cfd = 0;
    int one = 0;
    union {
      struct sockaddr_in ipv4;
      struct sockaddr_in6 ipv6;
    } sa;
    socklen_t len = sizeof sa;
    int rc = 0, af;
   
    rc = fdwait(fd, 'r');
    check(rc != -1, "Failed waiting on non-block accept.");

    taskstate("netaccept");
    cfd = accept(fd, (void*)&sa, &len);
    check(cfd != -1, "Failed calling accept on socket that was ready.");
    af = sa.ipv4.sin_family;

    if(server) {
        check(inet_ntop(af, af == AF_INET ? &sa.ipv4.sin_addr : &sa.ipv6.sin6_addr,
			server, IPADDR_SIZE) != NULL,
	      "Major failure, cannot ntop ipaddresses.");
    }

    if(port) {
        *port = ntohs(af == AF_INET ? sa.ipv4.sin_port : sa.ipv6.sin6_port);
    }

    fdnoblock(cfd);

    if(SET_NODELAY) {
        one = 1;
        setsockopt(cfd, IPPROTO_TCP, TCP_NODELAY, (char*)&one, sizeof one);
    }

    taskstate("netaccept succeeded");
    return cfd;

error:
    taskstate("accept failed");
    return -1;
}