#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <stdbool.h>

int main() {
        int fds[2];
        int domain;
        domain = AF_UNIX;
        // domain = AF_INET; // works
        printf("Domain: %i\n", domain);
        int ret = socketpair(domain, SOCK_DGRAM, 0, fds); // try also: SOCK_STREAM
        if(ret) {
                perror("Could not get socketpair");
                return 1;
        }

        /*
        struct timeval v = {
                .tv_sec = 1,
                .tv_usec = 0
        };
        ret = setsockopt(fds[0], SOL_SOCKET, SO_RCVTIMEO, &v, sizeof(v));
        if(ret) {
                perror("setsockopt");
        }
        */

        size_t bufLen = 1024;
        char *buf = calloc(bufLen, 1);
        int ok = 0;
        while(true) {
                printf("recv %i\n", ok);
                ret = recv(fds[0], &buf[0], bufLen, MSG_DONTWAIT);
                // expected: EWOULDBLOCK/EAGAIN (on Linux, macOS, Haiku)
                printf("%i\n", ret);
                if(ret < 0) {
                        perror("recv");
                        break;
                } else {
                        ok++;
                }
        }

        return 0;
}