void MythSystemSignalManager::run(void)
{
RunProlog();
LOG(VB_GENERAL, LOG_INFO, "Starting process signal handler");
while( run_system )
{
struct timespec ts;
ts.tv_sec = 0;
ts.tv_nsec = 50 * 1000 * 1000; // 50ms
nanosleep(&ts, NULL); // sleep 50ms
while( run_system )
{
// handle cleanup and signalling for closed processes
listLock.lock();
if( msList.isEmpty() )
{
listLock.unlock();
break;
}
MythSystemUnix *ms = msList.takeFirst();
listLock.unlock();
// This can happen if it has been deleted already
if (!ms)
continue;
ms->m_parent->HandlePostRun();
if (ms->m_stdpipe[0] > 0)
writeThread->remove(ms->m_stdpipe[0]);
CLOSE(ms->m_stdpipe[0]);
if (ms->m_stdpipe[1] > 0)
readThread->remove(ms->m_stdpipe[1]);
CLOSE(ms->m_stdpipe[1]);
if (ms->m_stdpipe[2] > 0)
readThread->remove(ms->m_stdpipe[2]);
CLOSE(ms->m_stdpipe[2]);
if( ms->GetStatus() == GENERIC_EXIT_OK )
emit ms->finished();
else
emit ms->error(ms->GetStatus());
ms->disconnect();
bool cleanup = ms->m_parent->doAutoCleanup();
ms->Unlock();
if( cleanup )
ms->deleteLater();
}
}
RunEpilog();
}
void MythSystemManager::run(void)
{
RunProlog();
LOG(VB_GENERAL, LOG_INFO, "Starting process manager");
// run_system is set to NULL during shutdown, and we need this thread to
// exit during shutdown.
while( run_system )
{
usleep(100000); // sleep 100ms
// check for any running processes
m_mapLock.lock();
if( m_pMap.isEmpty() )
{
m_mapLock.unlock();
continue;
}
m_mapLock.unlock();
MythSystemUnix *ms;
pid_t pid;
int status;
// check for any newly exited processes
listLock.lock();
while( (pid = waitpid(-1, &status, WNOHANG)) > 0 )
{
m_mapLock.lock();
// unmanaged process has exited
if( !m_pMap.contains(pid) )
{
LOG(VB_SYSTEM, LOG_INFO,
QString("Unmanaged child (PID: %1) has exited!") .arg(pid));
m_mapLock.unlock();
continue;
}
// pop exited process off managed list, add to cleanup list
ms = m_pMap.take(pid);
m_mapLock.unlock();
msList.append(ms);
// handle normal exit
if( WIFEXITED(status) )
{
ms->SetStatus(WEXITSTATUS(status));
LOG(VB_SYSTEM, LOG_INFO,
QString("Managed child (PID: %1) has exited! "
"command=%2, status=%3, result=%4")
.arg(pid) .arg(ms->GetLogCmd()) .arg(status)
.arg(ms->GetStatus()));
}
// handle forced exit
else if( WIFSIGNALED(status) &&
ms->GetStatus() != GENERIC_EXIT_TIMEOUT )
{
// Don't override a timed out process which gets killed, but
// otherwise set the return status appropriately
int sig = WTERMSIG(status);
ms->SetStatus( GENERIC_EXIT_KILLED );
LOG(VB_SYSTEM, LOG_INFO,
QString("Managed child (PID: %1) has signalled! "
"command=%2, status=%3, result=%4, signal=%5")
.arg(pid) .arg(ms->GetLogCmd()) .arg(status)
.arg(ms->GetStatus()) .arg(sig));
}
// handle abnormal exit (crash)
else
{
ms->SetStatus( GENERIC_EXIT_NOT_OK );
LOG(VB_SYSTEM, LOG_ERR,
QString("Managed child (PID: %1) has terminated! "
"command=%2, status=%3, result=%4")
.arg(pid) .arg(ms->GetLogCmd()) .arg(status)
.arg(ms->GetStatus()));
}
}
// loop through running processes for any that require action
MSMap_t::iterator i, next;
time_t now = time(NULL);
m_mapLock.lock();
m_jumpLock.lock();
for( i = m_pMap.begin(); i != m_pMap.end(); i = next )
{
next = i + 1;
pid = i.key();
ms = i.value();
if (!ms)
continue;
// handle processes beyond marked timeout
if( ms->m_timeout > 0 && ms->m_timeout < now )
{
// issuing KILL signal after TERM failed in a timely manner
if( ms->GetStatus() == GENERIC_EXIT_TIMEOUT )
{
LOG(VB_SYSTEM, LOG_INFO,
QString("Managed child (PID: %1) timed out"
", issuing KILL signal").arg(pid));
// Prevent constant attempts to kill an obstinate child
ms->m_timeout = 0;
ms->Signal(SIGKILL);
}
// issuing TERM signal
else
{
LOG(VB_SYSTEM, LOG_INFO,
QString("Managed child (PID: %1) timed out"
", issuing TERM signal").arg(pid));
ms->SetStatus( GENERIC_EXIT_TIMEOUT );
ms->m_timeout = now + 1;
ms->Term();
}
}
if ( m_jumpAbort && ms->GetSetting("AbortOnJump") )
ms->Term();
}
m_jumpAbort = false;
m_jumpLock.unlock();
m_mapLock.unlock();
// hold off unlocking until all the way down here to
// give the buffer handling a chance to run before
// being closed down by signal thread
listLock.unlock();
}
// kick to allow them to close themselves cleanly
if (readThread)
readThread->wake();
if (writeThread)
writeThread->wake();
RunEpilog();
}