/**
* \brief Initializes signal lock and signal values.
*
* Start() must be called to actually begin continuous
* signal monitoring. The timeout is set to 3 seconds,
* and the signal threshold is initialized to 0%.
*
* \param db_cardnum Recorder number to monitor,
* if this is less than 0, SIGNAL events will not be
* sent to the frontend even if SetNotifyFrontend(true)
* is called.
* \param _channel ExternalChannel for card
* \param _flags Flags to start with
*/
ExternalSignalMonitor::ExternalSignalMonitor(
int db_cardnum, ExternalChannel *_channel, uint64_t _flags) :
DTVSignalMonitor(db_cardnum, _channel, _flags),
m_stream_handler(NULL), m_stream_handler_started(false)
{
QString result;
LOG(VB_CHANNEL, LOG_INFO, LOC + "ctor");
m_stream_handler = ExternalStreamHandler::Get(_channel->GetDevice());
if (!m_stream_handler || m_stream_handler->HasError())
LOG(VB_GENERAL, LOG_ERR, LOC + "Open failed");
else
m_lock_timeout = GetLockTimeout() * 1000;
}
void DotLock::Lock(const char *lockfile)
{
Unlock();
unsigned nseconds=GetLockSleep();
unsigned timeout=GetLockTimeout();
const char *q, *r;
refresh_interval=GetLockRefresh();
for (q=r=lockfile; *q; q++)
if (*q == '/') r=q+1;
q= TempName( r-lockfile ? lockfile:"", r-lockfile);
struct stat last_stat;
int has_last_stat=0;
AlarmTimer stat_timer;
memset(&last_stat, 0, sizeof(last_stat));
while (attemptlock(q, lockfile))
{
struct stat current_stat;
if (stat(lockfile, ¤t_stat) == 0)
{
if (!has_last_stat ||
current_stat.st_ino != last_stat.st_ino ||
current_stat.st_ctime != last_stat.st_ctime ||
current_stat.st_atime != last_stat.st_atime)
{
has_last_stat=1;
last_stat=current_stat;
stat_timer.Set(timeout);
}
else if (stat_timer.Expired())
{
unlink(lockfile);
}
}
AlarmSleep sleep(nseconds);
}
if (refresh_interval >= 10)
refresh.Set(refresh_interval);
}
