int backend(int pfd)
{
signal(SIGTERM, sig);
for(;;) {
ssize_t res;
int cmd, tmp;
/* get command */
cmd = 0;
if(read(pfd, &cmd, 1) == -1 && errno != EINTR) {
perror("pipe read blew up in my face! wtf");
return -1;
}
switch(cmd) {
case CMD_PING:
tmp = (dpid = get_daemon_pid()) != -1;
write(pfd, &tmp, 1);
break;
case CMD_CFG:
{
char *buf = (char*)&cfg;
int sz = sizeof cfg;
while(sz && (res = read(pfd, buf, sz)) > 0) {
buf += res;
sz -= res;
}
update_cfg();
}
break;
case CMD_STARTX:
case CMD_STOPX:
if(dpid == -1) {
if((dpid = get_daemon_pid()) == -1) {
return -1;
}
}
if(kill(dpid, cmd == CMD_STARTX ? SIGUSR1 : SIGUSR2) == -1) {
if(errno != EPERM) {
dpid = -1;
kill(getppid(), SIGUSR2);
}
}
break;
default:
fprintf(stderr, "unknown CMD: %d\n", (int)cmd);
break;
}
}
return 0;
}
int is_myself_running(const char *pid_path)
{
int retVal = -1;
struct stat fStatBuf;
retVal = stat(pid_path, &fStatBuf);
if(0 == retVal)
{
pid_t pid = -1;
pid = get_daemon_pid(pid_path);
if (pid > 0) /*Process pid exist*/
{
if (kill(pid, 0) == 0)
{
logs(LOG_CRIT, "file \"%s\" already exists.\n"
"\t\tAnother program (pid: %d) seems to be running.\n", pid_path, pid);
return RUNNING;
}
else /*Send signal to the old process get no reply.*/
{
logs(LOG_DEBG, "Program (pid: %d) seems exit. Do some clean work now.\n", pid);
remove(pid_path);
return NOT_RUNNING;
}
}
else if(0 == pid)
{
logs(LOG_INFO, "Last Running PID file is empty, clean it now.\n");
remove(pid_path);
return NOT_RUNNING;
}
else /*Read pid from file "pid_path" failure*/
{
logs(LOG_CRIT, "File \"%s\" already exists, but I can not read the process pid."
"Maybe another program is running?\n"
"If the program is not running, remove it and try again.\n" ,
pid_path);
return RUNNING;
}
}
return NOT_RUNNING;
}
static int query_x11(void)
{
Display *dpy;
Window win, root_win;
XTextProperty wname;
Atom type, command_event;
int fmt;
unsigned long nitems, bytes_after;
unsigned char *prop;
if(!(dpy = XOpenDisplay(0))) {
return 0;
}
root_win = DefaultRootWindow(dpy);
if((command_event = XInternAtom(dpy, "CommandEvent", True)) == None) {
XCloseDisplay(dpy);
return 0;
}
XGetWindowProperty(dpy, root_win, command_event, 0, 1, False, AnyPropertyType,
&type, &fmt, &nitems, &bytes_after, &prop);
if(!prop) {
XCloseDisplay(dpy);
return 0;
}
win = *(Window*)prop;
XFree(prop);
if(!XGetWMName(dpy, win, &wname) || strcmp("Magellan Window", (char*)wname.value) != 0) {
XCloseDisplay(dpy);
return 0;
}
XCloseDisplay(dpy);
/* found a magellan window, still it might belong to the 3dxsrv driver */
if(get_daemon_pid() == -1) {
return 0;
}
/* this could still mean that the daemon crashed and left behind the pidfile... */
return 1; /* ... but wtf */
}
static int update_cfg(void)
{
if(write_cfg(CFGFILE, &cfg) == -1) {
return -1;
}
if(dpid == -1) {
if((dpid = get_daemon_pid()) == -1) {
return -1;
}
}
if(kill(dpid, SIGHUP) == -1 && errno != EPERM) {
dpid = -1; /* invalidate pid, will be searched again next time */
return -1;
}
return 0;
}
