Beispiel #1
0
int main(int argc, char ** argv, char ** envp) {
  while(1) {
    fprintf(stderr, "Sleep...\n");
    slepp(1);
  }
  return 0;
}
Beispiel #2
0
int main(int argc, char ** argv, char ** envp) {
  int i, j;
  char buf[16];
  char * args[3];
  struct sigaction action;
  action.sa_flags = SA_SIGINFO;
  action.sa_sigaction = sig_handler;
  sigemptyset(&action.sa_mask);
  sigaction(SIGCHLD, &action, NULL);
  sigaction(SIGTERM, &action, NULL);

  srand(time(NULL));
  fprintf(stderr, "hello, pid=%d, argc=%d, argv0=[%s], argv1=[%s]\n", getpid(), argc, argv[0], argv[1]);

  while(1) {
    slepp(1);
    switch(rand() & 0xf) {
      case 0: // Fork...
        if (fork() == 0) {
          srand(getpid());
          fprintf(stderr, "fork, pid=%d\n", getpid());
        }
        break;
      case 1: // Exit...
        fprintf(stderr, "exit, pid=%d\n", getpid());
        exit(0);
      case 2:
      case 3: // Exec...
        j = 0;
        if (argc > 1) sscanf(argv[1], "%d", &j);
        sprintf(buf, "%d", ++j);
        args[0] = argv[0];
        args[1] = buf;
        args[2] = NULL;
        fprintf(stderr, "exec, argv0=[%s], argv1=[%s]\n", argv[0], buf);
        execve(argv[0], args, envp);
        break;
      default: // Do nothing by default...
        fprintf(stderr, "sleep, zzzz...\n");
        slepp(2 + (rand() % 5));
    }
  }
  return 0;
}
int main()
{
  int server_sockfd, client_sockfd;
  int server_len, client_len;
  struct sockaddr_in server_address;
  struct sockaddr_in client_address;

  server_sockfd = socket(AF_INET,SOCK_STREAM,0);
  server_address.sin_family = AF_INET;
  server_address.sin_addr.s_addr = htonl(INADDR_ANY);
  server_address.sin_port = htons(9734);
  server_len = sizeof(server_address);
  bind(server_sockfd, (struct sockaddr *)&server_address, server_len);
  
  listen(server_sockfd, 5);
  signal(SIGCHLD,SIG_INT);

  while(1)
  {
    char ch;
    printf("server waititng \n");
  
    client_len = sizeof(client_address);
    client_sockfd = accept(server_sockfd,(struct sockaddr *)&client_address,&client_len);
    if (fork() == 0) {
        read(client_sockfd, &ch, 1);
        slepp(5);
        ch++;
        write(client_sockfd, &ch, 1);
        close(client_sockfd);
        exit(EXIT_SUCCESS);
    }
    else {
       close(client_sockfd);
    }
  }
}