Sample Codes : Use abstract unix socket to do IPC

Server Codes:
#include <errno.h>
#include <iostream>
#include <stddef.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>

using namespace std;

int main()
{
  // create socket fd
  int server_sockfd = socket(AF_UNIX, SOCK_STREAM, 0);
  if (-1 == server_sockfd) {
    cout << strerror(errno) << endl;
    return -1;
  }

  // create local socket
  struct sockaddr_un server_address;
  server_address.sun_family = AF_UNIX;
  // use abstract namespace
  server_address.sun_path[0] = '\0';
  strncpy(server_address.sun_path+1, SERVER_NAME, strlen(SERVER_NAME));

  // bind fd with named socket
  if (-1 == bind(server_sockfd, (struct sockaddr *)&server_address, offsetof(sockaddr_un, sun_path) + 1 + strlen(SERVER_NAME))) {
    cout << strerror(errno) << endl;
    return -2;
  }

  // passive socket as a server, the maximum length to which the queue of pending
  // connections for sockfd may grow is 5
  if (-1 == listen(server_sockfd, 5)) {
    cout << strerror(errno) << endl;
    return -3;
  }

  while(1) {
    cout << "tizen ads server is running" << endl;
    struct sockaddr_un client_address;
    socklen_t len;
    int client_sockfd = accept(server_sockfd, (struct sockaddr *)&client_address, &len);
    if (-1 == client_sockfd) {
        cout << strerror(errno) << endl;
        continue;
    }
    char ch;
    read(client_sockfd, &ch, 1);
    ch++;
    write(client_sockfd, &ch, 1);
    close(client_sockfd);
  }

  return 0;
}

Client codes:
#include <errno.h>
#include <iostream>
#include <stddef.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/un.h>
#include <unistd.h>

using namespace std;

int main()
{
  // create socket fd
  int sockfd = socket(AF_UNIX, SOCK_STREAM, 0);
  if (-1 == sockfd) {
    cout << strerror(errno) << endl;
    return -1;
  }

  // create local socket
  struct sockaddr_un address;
  address.sun_family = AF_UNIX;
  // use abstract namespace
  address.sun_path[0] = '\0';
  strncpy(address.sun_path+1, SERVER_NAME, strlen(SERVER_NAME));

  // connect server
  if (-1 == connect(sockfd, (struct sockaddr *)&address, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(SERVER_NAME))) {
    if (EINPROGRESS != errno) {
      cout << strerror(errno) << endl;
      return -2;
    }
  }

  char ch = 'A';
  cout << "client send 'A' " << endl;
  write(sockfd, &ch, 1);
  read(sockfd, &ch, 1);
  cout << "server send back " << ch << endl;

  close(sockfd);
  return 0;
}

PS:
1. please define SERVER_NAME by your self.
2. the red color line are key codes, keep same, otherwise you will get connection refused error.

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