func (s *State) waitForNextCommand(dev Device, ch chan bool) {
for {
pfd := []unix.PollFd{
{
Fd: devFd,
Events: unix.POLLIN,
Revents: 0,
},
{
Fd: int32(pipeFds[0]),
Events: unix.POLLIN,
Revents: 0,
},
}
_, err := unix.Poll(pfd, -1)
if err != nil {
log.Errorln("Poll command failed: ", err)
ch <- false
break
}
if pfd[1].Revents == unix.POLLIN {
log.Infoln("Poll command receive finish signal")
ch <- false
break
}
if pfd[0].Revents != 0 && pfd[0].Revents != unix.POLLIN {
log.Errorln("Poll received unexpect event: ", pfd[0].Revents)
ch <- false
break
}
ch <- true
}
}
func TestPoll(t *testing.T) {
f, cleanup := mktmpfifo(t)
defer cleanup()
const timeout = 100
ok := make(chan bool, 1)
go func() {
select {
case <-time.After(10 * timeout * time.Millisecond):
t.Errorf("Poll: failed to timeout after %d milliseconds", 10*timeout)
case <-ok:
}
}()
fds := []unix.PollFd{{Fd: int32(f.Fd()), Events: unix.POLLIN}}
n, err := unix.Poll(fds, timeout)
ok <- true
if err != nil {
t.Errorf("Poll: unexpected error: %v", err)
return
}
if n != 0 {
t.Errorf("Poll: wrong number of events: got %v, expected %v", n, 0)
return
}
}