/* a server in the unix domain.  The pathname of 
   the socket address is passed as an argument */
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/un.h>
#include <stdio.h>
void error(const char *);
int main(int argc, char *argv[])
{
   int sockfd, newsockfd, servlen, n;
   socklen_t clilen;
   struct sockaddr_un  cli_addr, serv_addr;
   char buf[80];

   if ((sockfd = socket(AF_UNIX,SOCK_STREAM,0)) < 0)
       error("creating socket");
   bzero((char *) &serv_addr, sizeof(serv_addr));
   serv_addr.sun_family = AF_UNIX;
   strcpy(serv_addr.sun_path, argv[1]);
   servlen=strlen(serv_addr.sun_path) + 
                     sizeof(serv_addr.sun_family);
   if(bind(sockfd,(struct sockaddr *)&serv_addr,servlen)<0)
       error("binding socket"); 

   listen(sockfd,5);
   clilen = sizeof(cli_addr);
   newsockfd = accept(
        sockfd,(struct sockaddr *)&cli_addr,&clilen);
   if (newsockfd < 0) 
        error("accepting");
   n=read(newsockfd,buf,80);
   printf("A connection has been established\n");
   write(1,buf,n);
   write(newsockfd,"I got your message\n",19);
   close(newsockfd);
   close(sockfd);
   return 0;
}

void error(const char *msg)
{
    perror(msg);
    exit(0);
}