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/* gcc -g -Wall -L/usr/X11R6/lib/ -lXss -o test test.c */
#include <stdio.h>
#include <stdlib.h>
#include <X11/Xlib.h>
#include <X11/Xproto.h>
#include <X11/Xutil.h>
#include <X11/extensions/scrnsaver.h>
Display *dpy;
void elock_open_display(int argc, char *argv[])
{
char *display;
display = getenv("DISPLAY");
if (!(dpy = XOpenDisplay(display)))
{
perror("Cannot open display\n");
exit(1);
}
fprintf(stdout,"DISPLAY OPENDED\n");
}
int fatal(char *s)
{
printf ("fatal: %s\n", s);
exit (1);
}
void ignoreError (Display *dpy, XErrorEvent *error)
{
printf ("ignoring error\n");
}
char *stateNames[] = { "Off", "On", "Cycle", "Disable" };
char *kindNames[] = { "Blanked", "Internal", "External" };
int main(int argc, char **argv)
{
XEvent pe;
XScreenSaverNotifyEvent *se;
Window root, saver;
int screen;
int majorVersion, minorVersion;
int error_base, event_base;
XScreenSaverInfo *info;
XSetWindowAttributes attr;
unsigned long mask;
GC gc;
/*_Xdebug = 1;*/ /* turn on synchronization */
elock_open_display(argc, argv);
if (!XScreenSaverQueryExtension (dpy, &event_base, &error_base))
fatal ("QueryExtension failed");
printf ("event_base %d, error_base %d\n", event_base, error_base);
if (!XScreenSaverQueryVersion (dpy, &majorVersion, &minorVersion))
fatal ("QueryVersion failed");
printf ("majorVersion: %d, minorVersion: %d\n", majorVersion, minorVersion);
root = DefaultRootWindow (dpy);
info = XScreenSaverAllocInfo ();
if (!XScreenSaverQueryInfo (dpy, root, info))
fatal ("QueryInfo");
if ( stateNames[info->state] == "Disable" || info->til_or_since == 0 )
printf("YOU YOU YOU YOU ICI");
printf ("|| window: 0lx%lx\n", info->window);
printf ("|| state: %s\n", stateNames[info->state]);
printf ("|| kind: %s\n", kindNames[info->kind]);
printf ("|| til_or_since: %ld\n", info->til_or_since);
printf ("|| idle: %ld\n", info->idle);
printf ("|| eventMask: 0lx%lx\n\n", info->eventMask);
saver = info->window;
XFree (info);
XScreenSaverSelectInput (dpy, root, ScreenSaverNotifyMask|ScreenSaverCycleMask);
screen = DefaultScreen(dpy);
attr.background_pixel = BlackPixel (dpy, screen);
mask = CWBackPixel;
XScreenSaverSetAttributes (dpy, root, 0, 0,
DisplayWidth(dpy, screen),
DisplayHeight (dpy, screen),
0,
CopyFromParent,
CopyFromParent,
CopyFromParent,
mask, &attr);
gc = DefaultGC (dpy, screen);
XSetForeground (dpy, gc, WhitePixel(dpy, screen));
while (1)
{
if ( ! XNextEvent(dpy, &pe));
fprintf(stdout,"ERROR\n");
fprintf(stdout,"DEBUG pe.type:%s\n",pe.type);
if (pe.type == event_base)
{
se = (XScreenSaverNotifyEvent *) &pe;
printf ("ScreenSaverNotifyEvent\n");
printf ("serial: %ld\n", se->serial);
printf ("send_event: %d\n", se->send_event);
printf ("window: %ld\n", se->window);
printf ("root: %ld\n", se->root);
printf ("state: %s\n", stateNames[se->state]);
printf ("kind: %s\n", kindNames[se->kind]);
printf ("forced: %d\n", se->forced);
printf ("time: %ld\n", se->time);
if (se->state == ScreenSaverOn &&
se->kind == ScreenSaverExternal)
{
/* XSetErrorHandler (ignoreError); */
XDrawString (dpy, saver, gc, 100, 100, "Screen Saver Test", 17);
XSync (dpy, False);
/* XSetErrorHandler (NULL); */
}
}
else
{
printf ("unexpected event %d\n", pe.type);
}
}
}
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