Materiale scritto in treno

[gapil.git] / sources / test_timerfdfork.c

diff --git a/sources/test_timerfdfork.c b/sources/test_timerfdfork.c
index 04fad750973f0726300a3e987fc530d5fc59e7fb..34ceaedd1b317c0d29bf31397a2a7e5718ad54f0 100644 (file)
--- a/sources/test_timerfdfork.c
+++ b/sources/test_timerfdfork.c
@@ -37,18 +37,28 @@
 #include <stdio.h>      /* standard I/O library */
 #include <string.h>      /* C strings library */
 #include <sys/timerfd.h> /* timerfd */
+#include <sys/epoll.h>   /* Linux epoll interface */
 // #include <time.h>
 
+#include "macros.h"
+#include "Gapil.h"
+
 /* Help printing routine */
 void usage(void);
+void die(char *);
+
+#define MAX_EPOLL_EV 10
 
 int main(int argc, char *argv[])
 {
 /* 
  * Variables definition  
  */
-    int i, fd;
+    int i, n, nread, fd, epfd;
+    pid_t pid;
+    struct epoll_event epev, events[MAX_EPOLL_EV];
     struct itimerspec expiring;
+    uint64_t expirated;
     /*
      * Input section: decode command line parameters 
      * Use getopt function
@@ -83,15 +93,53 @@ int main(int argc, char *argv[])
        printf("From %d arguments, removed %d options\n", argc, optind);
        usage();
     }
-
+    /* timerfd setup */
     fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK);
     expiring.it_interval.tv_sec=1;
     expiring.it_interval.tv_nsec=0;
     expiring.it_value.tv_sec=5;
     expiring.it_value.tv_nsec=0;
-    if (timerfd_settime(fd, 0, expiring, NULL)) {
-       perror("Cannot set timer");
+    if (timerfd_settime(fd, 0, &expiring, NULL)) {
+       die("Cannot set timer");
     }
+    pid = fork();
+    /* epoll setup */
+    if ((epfd=epoll_create(5)) < 0)
+       die("Failing on epoll_create");
+    epev.data.fd = fd;
+    epev.events = EPOLLIN;
+    if (epoll_ctl(epfd, EPOLL_CTL_ADD, fd, &epev))
+       die("Failing in epoll_ctl"); 
+    /* main loop */
+    //while (1) {
+        if ((n=epoll_wait(epfd, events, MAX_EPOLL_EV, -1)) < 0) 
+           die("error on epoll_wait");
+       debug("Got %i events\n", n);
+       /* loop on epoll events */
+       for (i=0; i<n; i++) {
+           if (events[i].data.fd == fd) {             // if timer expired
+               printf("Timer expired:\n");
+               while(nread=read(fd, &expirated, sizeof(expirated))) {
+                   if (nread < 0) {
+                       if (errno != EAGAIN) 
+                           die("signalfd read error");
+                       else 
+                           break;
+                   }
+                   if (nread != sizeof(expirated)) {
+                       printf("Error on timer data read, '\n");
+                       continue;
+                   }
+                   printf("Expired %llu times\n", expirated);
+                   if (pid == 0) {
+                       printf("in child\n");
+                   } else {
+                       printf("in father\n");
+                   }
+               }
+           }
+       }
+    // }
     return 0;
 }
 /*
@@ -105,4 +153,11 @@ void usage(void) {
     
     exit(1);
 }
+/*
+ * Print error message and exit routine
+ */
+void die(char * mess) {
+    perror(mess);
+    exit(-1);
+}