#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>

const char *path = "/tmp/socket_test";

void handle_error(char *txt)
{
    perror(txt);
    exit(-1);
}

int main()
{
    int sfd, cfd;
    socklen_t peer_addr_size;
    struct sockaddr_un my_addr, peer_addr;

    sfd = socket(AF_UNIX, SOCK_STREAM, 0);
    if (sfd == -1)
        handle_error("socket");

    memset(&my_addr, 0, sizeof(my_addr));
    my_addr.sun_family = AF_UNIX;
    strncpy(my_addr.sun_path, path,
            sizeof(my_addr.sun_path) - 1);

    if (bind(sfd, (struct sockaddr *)&my_addr,
             sizeof(my_addr)) == -1)
        handle_error("bind");

    if (listen(sfd, 1) == -1)
        handle_error("listen");

    /* Now we can accept incoming connections one
       at a time using accept(2). */

    peer_addr_size = sizeof(peer_addr);
    cfd = accept(sfd, (struct sockaddr *)&peer_addr,
                 &peer_addr_size);
    if (cfd == -1)
        handle_error("accept");

    double d1;
    read(cfd, (void *)&d1, sizeof(double));
    printf("%f\n", d1);
    close(cfd);
    /* Code to deal with incoming connection(s)... */

    if (close(sfd) == -1)
        handle_error("close");

    if (unlink(path) == -1)
        handle_error("unlink");

    return 0;
}