libxc/evtchn: Missed events when using several handles.

[Vincent Bernardoff <vb@luminar.eu.org>]

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Using the attached test programs, the select fails when using h2, and 
works with using h1 (line 41).

It seems that using several evtchn handles does not work correctly. What 
is the expected behaviour when using multiple event channel handles ?

Cheers,

Vincent

[-- Attachment #2: test_evtchn.c --]
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#include <stdio.h>
#include <stdlib.h>
#include <sys/select.h>
#include <xenctrl.h>

int main(int argc, char** argv)
{
  // This test is to check that you can use several handles to evtchn.

  xc_evtchn *h1, *h2;
  evtchn_port_or_error_t dest, src;
  int fd, ret;

  fd_set fdset;

  FD_ZERO(&fdset);

  h1 = xc_evtchn_open(NULL, 0);
  h2 = xc_evtchn_open(NULL, 0);

  if (h1 == NULL || h2 == NULL)
    {
      perror("xc_evtchn_open");
      exit(EXIT_FAILURE);
    }

  dest = xc_evtchn_bind_unbound_port(h1, 0);
  if (dest == -1)
    {
      perror("xc_evtchn_bind_unbound_port");
      exit(EXIT_FAILURE);
    }

  src = xc_evtchn_bind_interdomain(h1, 0, dest);
  if (src == -1)
    {
      perror("xc_evtchn_bind_interdomain");
      exit(EXIT_FAILURE);
    }

  fd = xc_evtchn_fd(h2);
  if (fd < 0)
    {
      perror("xc_evtchn_fd");
      exit(EXIT_FAILURE);
    }

  FD_SET(fd, &fdset);

  ret = xc_evtchn_notify(h1, src);
  if (ret == -1)
    {
      perror("xc_evtchn_notify");
      exit(EXIT_FAILURE);
    }

  ret = select(fd+1, &fdset, NULL, NULL, NULL);
  if (ret == -1)
    {
      perror("select");
      exit(EXIT_FAILURE);
    }

  printf("select says there is %d bit set in the bitmask.\n", ret);
  exit(EXIT_SUCCESS);
}

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