socket client
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <stdio.h>
#define DATA "Laboratorio di S.O."
int main(int argc, char *argv[])
{
 int sock;
 struct sockaddr_un server;
 char buf[1024];
 if (argc < 2) {
  printf("usage:%s <pathname>", argv[0]);
  exit(1);
 }
 sock = socket(AF_UNIX, SOCK_STREAM, 0);
 if (sock < 0) {
  perror("opening stream socket");
  exit(1);
 }
 server.sun_family = AF_UNIX;
 strcpy(server.sun_path, argv[1]);
 if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) {
  close(sock);
  perror("connecting stream socket");
  exit(1);
 }
 if (write(sock, DATA, sizeof(DATA)) < 0)
   perror("writing on stream socket");
 }
 close(sock);
}
