void WaitForChild(void)
{
int pid;
struct display *d;
waitType status;
sigset_t mask, omask;
sigemptyset(&mask);
sigaddset(&mask, SIGCHLD);
sigaddset(&mask, SIGHUP);
sigprocmask(SIG_BLOCK, &mask, &omask);
WDMDebug("signals blocked\n");
if (!ChildReady && !Rescan)
sigsuspend(&omask);
ChildReady = 0;
sigprocmask(SIG_SETMASK, &omask, (sigset_t *) NULL);
while ((pid = waitpid(-1, &status, WNOHANG)) > 0)
{
WDMDebug("Manager wait returns pid: %d sig %d core %d code %d\n", pid, waitSig(status), waitCore(status), waitCode(status));
if (autoRescan.i)
RescanIfMod();
/* SUPPRESS 560 */
if ((d = FindDisplayByPid(pid))) {
d->pid = -1;
switch (waitVal(status)) {
case UNMANAGE_DISPLAY:
WDMDebug("Display exited with UNMANAGE_DISPLAY\n");
StopDisplay(d);
break;
case OBEYSESS_DISPLAY:
d->startTries = 0;
WDMDebug("Display exited with OBEYSESS_DISPLAY\n");
if (d->displayType.lifetime != Permanent || d->status == zombie)
StopDisplay(d);
else
RestartDisplay(d, FALSE);
break;
default:
WDMDebug("Display exited with unknown status %d\n", waitVal(status));
WDMError("Unknown session exit code %d from process %d\n", waitVal(status), pid);
StopDisplay(d);
break;
case OPENFAILED_DISPLAY:
WDMDebug("Display exited with OPENFAILED_DISPLAY, try %d of %d\n", d->startTries, d->startAttempts);
WDMError("Display %s cannot be opened\n", d->name);
/*
* no display connection was ever made, tell the
* terminal that the open attempt failed
*/
#ifdef XDMCP
if (d->displayType.origin == FromXDMCP)
SendFailed(d, "Cannot open display");
#endif
if (d->displayType.origin == FromXDMCP || d->status == zombie || ++d->startTries >= d->startAttempts) {
WDMError("Display %s is being disabled\n", d->name);
StopDisplay(d);
} else {
RestartDisplay(d, TRUE);
}
break;
case RESERVER_DISPLAY:
d->startTries = 0;
WDMDebug("Display exited with RESERVER_DISPLAY\n");
if (d->displayType.origin == FromXDMCP || d->status == zombie)
StopDisplay(d);
else
RestartDisplay(d, TRUE);
{
Time_t Time;
time(&Time);
WDMDebug("time %i %i\n", (int)Time, (int)d->lastCrash);
if (d->lastCrash && ((Time - d->lastCrash) < XDM_BROKEN_INTERVAL)) {
WDMDebug("Server crash frequency too high:" " removing display %s\n", d->name);
WDMError("Server crash rate too high:" " removing display %s\n", d->name);
RemoveDisplay(d);
} else
d->lastCrash = Time;
}
break;
case waitCompose(SIGTERM, 0, 0):
WDMDebug("Display exited on SIGTERM, try %d of %d\n", d->startTries, d->startAttempts);
if (d->displayType.origin == FromXDMCP || d->status == zombie || ++d->startTries >= d->startAttempts) {
WDMError("Display %s is being disabled\n", d->name);
StopDisplay(d);
} else
RestartDisplay(d, TRUE);
break;
case REMANAGE_DISPLAY:
d->startTries = 0;
WDMDebug("Display exited with REMANAGE_DISPLAY\n");
/*
* XDMCP will restart the session if the display
* requests it
*/
if (d->displayType.origin == FromXDMCP || d->status == zombie)
StopDisplay(d);
else
RestartDisplay(d, FALSE);
break;
}
}
/* SUPPRESS 560 */
else if ((d = FindDisplayByServerPid(pid))) {
d->serverPid = -1;
switch (d->status) {
case zombie:
WDMDebug("Zombie server reaped, removing display %s\n", d->name);
RemoveDisplay(d);
break;
case phoenix:
WDMDebug("Phoenix server arises, restarting display %s\n", d->name);
d->status = notRunning;
break;
case running:
WDMDebug("Server for display %s terminated unexpectedly, status %d %d\n", d->name, waitVal(status), status);
WDMError("Server for display %s terminated unexpectedly: %d\n", d->name, waitVal(status));
d->status = notRunning;
if (d->pid != -1) {
WDMDebug("Terminating session pid %d\n", d->pid);
TerminateProcess(d->pid, SIGTERM);
}
break;
case notRunning:
WDMDebug("Server exited for notRunning session on display %s\n", d->name);
break;
}
} else {
WDMDebug("Unknown child termination, status %d\n", waitVal(status));
}
}
StartDisplays();
}
void
WaitForChild (void)
{
pid_t pid;
struct display *d;
waitType status;
sigset_t mask, omask;
sigemptyset(&mask);
sigaddset(&mask, SIGCHLD);
sigaddset(&mask, SIGHUP);
sigprocmask(SIG_BLOCK, &mask, &omask);
Debug ("signals blocked\n");
if (!ChildReady && !Rescan)
sigsuspend(&omask);
ChildReady = 0;
sigprocmask(SIG_SETMASK, &omask, (sigset_t *)NULL);
while ((pid = waitpid (-1, &status, WNOHANG)) > 0)
{
Debug ("Manager wait returns pid: %d sig %d core %d code %d\n",
pid, waitSig(status), waitCore(status), waitCode(status));
if (autoRescan)
RescanIfMod ();
/* SUPPRESS 560 */
if ((d = FindDisplayByPid (pid))) {
d->pid = -1;
switch (waitVal (status)) {
case UNMANAGE_DISPLAY:
Debug ("Display exited with UNMANAGE_DISPLAY\n");
StopDisplay (d);
break;
case OBEYSESS_DISPLAY:
d->startTries = 0;
d->reservTries = 0;
Debug ("Display exited with OBEYSESS_DISPLAY\n");
if (d->status == zombie)
StopDisplay (d);
else
RestartDisplay (d, FALSE);
break;
case OPENFAILED_DISPLAY:
Debug ("Display exited with OPENFAILED_DISPLAY, try %d of %d\n",
d->startTries, d->startAttempts);
LogError ("Display %s cannot be opened\n", d->name);
/*
* no display connection was ever made, tell the
* terminal that the open attempt failed
*/
if (d->status == zombie ||
++d->startTries >= d->startAttempts)
{
LogError ("Display %s is being disabled\n", d->name);
StopDisplay (d);
}
else
{
RestartDisplay (d, TRUE);
}
break;
case RESERVER_DISPLAY:
d->startTries = 0;
Debug ("Display exited with RESERVER_DISPLAY\n");
if (d->status == zombie)
StopDisplay(d);
else {
Time_t now;
int crash;
time(&now);
crash = d->lastReserv &&
((now - d->lastReserv) < XDM_BROKEN_INTERVAL);
Debug("time %lli %lli try %i of %i%s\n",
(long long)now, (long long)d->lastReserv,
d->reservTries, d->reservAttempts,
crash ? " crash" : "");
if (!crash)
d->reservTries = 0;
if (crash && ++d->reservTries >= d->reservAttempts) {
const char *msg =
"Server crash frequency too high: stopping display";
Debug("%s %s\n", msg, d->name);
LogError("%s %s\n", msg, d->name);
/* For a local X server either:
* 1. The server exit was returned by waitpid(). So
* serverPid==-1 => StopDisplay() calls RemoveDisplay()
*
* 2. The server is in zombie state or still running. So
* serverPid>1 => StopDisplay()
* a. sets status=zombie,
* b. kills the server.
* The next waitpid() returns this zombie server pid
* and the 'case zombie:' below then calls
* RemoveDisplay().
*/
StopDisplay(d);
} else {
RestartDisplay(d, TRUE);
}
d->lastReserv = now;
}
break;
case waitCompose (SIGTERM,0,0):
Debug ("Display exited on SIGTERM, try %d of %d\n",
d->startTries, d->startAttempts);
if (d->status == zombie ||
++d->startTries >= d->startAttempts)
{
/*
* During normal xdm shutdown, killed local X servers
* can be zombies; this is not an error.
*/
if (d->status == zombie &&
(d->startTries < d->startAttempts))
LogInfo ("display %s is being disabled\n", d->name);
else
LogError ("display %s is being disabled\n", d->name);
StopDisplay(d);
} else
RestartDisplay (d, TRUE);
break;
case REMANAGE_DISPLAY:
d->startTries = 0;
Debug ("Display exited with REMANAGE_DISPLAY\n");
/*
* XDMCP will restart the session if the display
* requests it
*/
if (d->status == zombie)
StopDisplay(d);
else
RestartDisplay (d, FALSE);
break;
default:
Debug ("Display exited with unknown status %d\n", waitVal(status));
LogError ("Unknown session exit code %d from process %d\n",
waitVal (status), pid);
StopDisplay (d);
break;
}
}
/* SUPPRESS 560 */
else if ((d = FindDisplayByServerPid (pid)))
{
d->serverPid = -1;
switch (d->status)
{
case zombie:
Debug ("Zombie server reaped, removing display %s\n", d->name);
RemoveDisplay (d);
break;
case phoenix:
Debug ("Phoenix server arises, restarting display %s\n", d->name);
d->status = notRunning;
break;
case running:
Debug ("Server for display %s terminated unexpectedly, status %d %d\n", d->name, waitVal (status), status);
LogError ("Server for display %s terminated unexpectedly: %d\n", d->name, waitVal (status));
if (d->pid != -1)
{
Debug ("Terminating session pid %d\n", d->pid);
kill (d->pid, SIGTERM);
}
break;
case notRunning:
Debug ("Server exited for notRunning session on display %s\n", d->name);
break;
}
}
else
{
Debug ("Unknown child termination, status %d\n", waitVal (status));
}
}
StartDisplays ();
}