listati/FifoReporter-main.c

   1     /* Main body: wait something to report */
   2     while (1) {
   3         if ((n=epoll_wait(epfd, events, MAX_EPOLL_EV, -1)) < 0)
   4             die("error on epoll_wait");
   5         for (i=0; i<n; i++) {    // loop on ready file descriptors
   6             if (events[i].data.fd == sigfd) {  // look if signalfd ready
   7                 printf("Signal received:\n");
   8                 while(nread=read(sigfd, &siginf, sizeof(siginf))) {
   9                     if (nread < 0) {
  10                         if (errno != EAGAIN)
  11                             die("signalfd read error");
  12                         else
  13                             break;
  14                     }
  15                     if (nread != sizeof(siginf)) {
  16                         printf("Error on signal data read, '\n");
  17                         continue;
  18                     }
  19                     printf("Got %s\n", sig_names[siginf.ssi_signo]);
  20                     printf("From pid %i\n", siginf.ssi_pid);
  21                     if(siginf.ssi_signo == SIGINT) { // SIGINT stop program
  22                         unlink(fifoname);
  23                         exit(0);
  24                     }
  25                 }
  26             } else if (events[i].data.fd == fifofd) { // look if fifofd ready
  27                 printf("Message from fifo:\n");
  28                 while ((nread = read(fifofd, buffer, 5000))) {
  29                     if (nread < 0) {
  30                         if (errno != EAGAIN)
  31                             die("fifo read error");
  32                         else
  33                             printf("end message\n");
  34                         break;
  35                     }
  36                     buffer[nread] = 0;
  37                     if (fputs(buffer, stdout) == EOF)
  38                         die("Errore in scrittura su terminale");
  39                 }
  40             } else {   // anything else is an error
  41                 printf("epoll activity on unknown %i file descriptor\n",
  42                        epev.data.fd);
  43                 exit(-1);
  44             }
  45         }
  46     }