//--------------------------------------------------------------------------------------------------
static void SigChildHandler
(
int sigNum
)
{
// More than one child may have changed state so keep checking until we get all of them.
while (1)
{
// Get the pid of the child process that changed state but do not reap the child so that we
// can look at the child process's info.
pid_t pid = wait_Peek();
if (pid == 0)
{
// No more children have terminated.
break;
}
// Send the pid to the apps SIGCHILD handler for processing.
le_result_t result = apps_SigChildHandler(pid);
if (result == LE_FAULT)
{
// There was an app fault that could not be handled so restart the framework.
Reboot();
}
if (result == LE_NOT_FOUND)
{
// Send the pid to the framework daemon's SIGCHILD handler for processing.
le_result_t r = fwDaemons_SigChildHandler(pid);
if (r == LE_FAULT)
{
CaptureDebugData();
Reboot();
}
else if (r == LE_NOT_FOUND)
{
// The child is neither an application process nor a framework daemon.
// Reap the child now.
wait_ReapChild(pid);
LE_CRIT("Unknown child process %d.", pid);
}
}
}
}
//--------------------------------------------------------------------------------------------------
proc_FaultAction_t proc_SigChildHandler
(
proc_Ref_t procRef, ///< [IN] The process reference.
int procExitStatus ///< [IN] The status of the process given by wait().
)
{
proc_FaultAction_t faultAction = PROC_FAULT_ACTION_NO_FAULT;
if (WIFSTOPPED(procExitStatus))
{
procRef->paused = true;
LE_INFO("Process '%s' (PID: %d) has paused.", procRef->name, procRef->pid);
}
else if (WIFCONTINUED(procExitStatus))
{
procRef->paused = false;
LE_INFO("Process '%s' (PID: %d) has been continued.", procRef->name, procRef->pid);
}
else
{
// The process died.
if (WIFEXITED(procExitStatus))
{
LE_INFO("Process '%s' (PID: %d) has exited with exit code %d.",
procRef->name, procRef->pid, WEXITSTATUS(procExitStatus));
if (WEXITSTATUS(procExitStatus) != EXIT_SUCCESS)
{
faultAction = GetFaultAction(procRef);
}
}
else if (WIFSIGNALED(procExitStatus))
{
int sig = WTERMSIG(procExitStatus);
// WARNING: strsignal() is non-reentrant. We use it here because the Supervisor is
// single threaded.
LE_INFO("Process '%s' (PID: %d) has exited due to signal %d (%s).",
procRef->name, procRef->pid, sig, strsignal(sig));
faultAction = GetFaultAction(procRef);
}
// Check the fault action. If it indicates that the process stopped due to an error, save
// all relevant data for future diagnosis.
if (faultAction != PROC_FAULT_ACTION_NO_FAULT)
{
// Check if we're rebooting. If we are, this data needs to be saved in a more permanent
// location.
bool isRebooting = faultAction == PROC_FAULT_ACTION_REBOOT;
CaptureDebugData(procRef, isRebooting);
}
procRef->pid = -1;
procRef->paused = false;
}
return faultAction;
}
