int main(){
int ret = kill_robot();
switch(ret){
case -2:
printf("WARNING: invalid contents in PID_FILE\n");
break;
case -1:
printf("Existing project failed to close and had to be killed.\n");
break;
case 0:
printf("No existing program is running.\n");
break;
case 1:
printf("An existing program was running and shut down cleanly.\n");
break;
default:
return 0;
}
return 0;
}
void
process_robots ()
{
int i, ret, rfd;
struct pollfd *pfd;
result_t result;
char buf[STD_BUF];
struct robot *robot;
int to_talk;
for (i = 0; i < max_robots; i++)
fds[i].events = POLLIN | POLLOUT;
do {
to_talk = 0;
rfd = -1;
for (i = 0; i < max_robots; i++) {
if (fds[i].fd != -1) {
to_talk++;
rfd = fds[i].fd;
}
}
if (to_talk == 0) {
if (winner)
ndprintf(stdout, "[GAME] Winner found\n");
else
ndprintf(stdout, "[GAME] Ended - No winner\n");
exit(EXIT_SUCCESS);
}
else if (to_talk == 1)
winner = 1;
poll(fds, max_robots, 10);
for (i = 0; i < max_robots; i++) {
robot = all_robots[i];
pfd = &fds[i];
if (pfd->fd == -1) // Dead robot
continue;
if (pfd->events == 0)
to_talk--;
if (pfd->revents & (POLLERR | POLLHUP)) { /* Error or disconnected robot -> kill */
close(pfd->fd);
pfd->fd = -1;
kill_robot(robot);
continue;
}
if (robot->damage >= 100) {
sockwrite(pfd->fd, DEAD, "Sorry!");
close(pfd->fd);
pfd->fd = -1;
continue;
}
if (!(pfd->revents & POLLIN))
continue;
if (!(pfd->revents & POLLOUT)) {
close(pfd->fd);
pfd->fd = -1;
kill_robot(robot);
continue;
}
ret = read(pfd->fd, buf, STD_BUF);
switch (ret) {
case -1:
close(pfd->fd);
pfd->fd = -1;
kill_robot(robot);
break;
case 0:
abort ();
default:
buf[ret] = '\0';
result = execute_cmd(robot, buf);
if (result.error) {
sockwrite(pfd->fd, ERROR, "Violation of the protocol!\n");
close(pfd->fd);
pfd->fd = -1;
kill_robot(robot);
}
else {
if (result.cycle)
pfd->events = 0;
if (winner && pfd->fd == rfd)
sockwrite(pfd->fd, END, "%d", result.result);
else
sockwrite(pfd->fd, OK, "%d", result.result);
}
break;
}
}
} while (to_talk && !timer);
}
void close_kill_robot(struct pollfd *pfd, struct robot *robot)
{
close(pfd->fd);
pfd->fd = -1;
kill_robot(robot);
}
