#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/un.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

int create_socket(const char* path) {
  struct sockaddr_un domain_socket_address;

  // Check that the provided path will fit into the socket address.
  // [Add your code here]

  // Check whether the socket already exists, and remove it if so.
  struct stat file_stat;
  if (!stat(path, &file_stat)) {
    if ((file_stat.st_mode & S_IFMT) == S_IFSOCK) {
      unlink(path);
    }
  }

  // Now set up the socket address (domain_socket_address).
  // [Add your code here]

  // Next, create a SOCK_SEQPACKET socket using socket(2).
  // [Add your code here]

  // Bind the socket to the address using bind(2).
  // [Add your code here]

  // Mark the socket as a listening socket using listen(2).
  // [Add your code here]


  return listener_socket;
}

void accept_loop(int listen_socket) {
  // Repeatedly accept connections using accept(2).
  // [Add your code here]
  //   Repeatedly recv(2) from the connection and print the result until no more data is recv(2)ed.
  //   [Add your code here]
  //   close(2) the connection.
  //   [Add your code here]
}

void cleanup_socket(int socket, const char* path) {
  // close(2) the socket
  // [Add your code here]

  // unlink(2) the socket from the filesystem
  // [Add your code here]
}

int main(int argc, char** argv) {

  if (argc != 2) {
    fprintf(stderr, "USAGE: domain-listener <socket path>\n");
    return 1;
  }

  const char* path = argv[1];
  int sock = create_socket(path);
  if (sock < 0) {
    fprintf(stderr, "Failed to create listener socket: %s\n", strerror(errno));
    return 1;
  }

  accept_loop(sock);

  cleanup_socket(sock, path);

  return 0;
}