int
startRouting (int column, int row, int screen) {
#ifdef SIGUSR1
int started = 0;
stopRouting();
switch (routingProcess = fork()) {
case 0: { /* child: cursor routing subprocess */
int result = ROUTING_ERROR;
if (!ROUTING_INTERVAL) {
int niceness = nice(ROUTING_NICENESS);
if (niceness == -1) {
logSystemError("nice");
}
}
if (constructRoutingScreen()) {
result = doRouting(column, row, screen); /* terminate child process */
destructRoutingScreen(); /* close second thread of screen reading */
}
_exit(result); /* terminate child process */
}
case -1: /* error: fork() failed */
logSystemError("fork");
routingProcess = NOT_ROUTING;
break;
default: /* parent: continue while cursor is being routed */
{
static int first = 1;
if (first) {
first = 0;
onProgramExit(exitRouting, "routing");
}
}
started = 1;
break;
}
return started;
#else /* SIGUSR1 */
routingStatus = doRouting(column, row, screen);
return 1;
#endif /* SIGUSR1 */
}
static void
exitRouting (void) {
stopRouting();
}
static void
exitCursorRouting (void *data) {
stopRouting();
}
