added second thread

Makefile

@@ -1,6 +1,7 @@
 
 PROG	= anyscroll
-FLAGS	= -lX11 -lXtst
+FLAGS	= -lX11 -lXtst -lXi -lpthread
+
 
 
 ${PROG}: ${PROG}.o 

anyscroll.c

@@ -4,25 +4,68 @@
 #include <X11/Xlib.h>
 #include <X11/extensions/XTest.h>
 #include <unistd.h>
-
+#include <X11/extensions/XInput2.h>
+#include <pthread.h>
 
 static Display *dpy;
 static int scr, sw, sh;
-
+static int sx, sy;
 static Window root;
 
-static void pressButton(int btn) {
-	XTestFakeButtonEvent(dpy, btn, True, CurrentTime);
-	XFlush(dpy);
-}
-static void releaseButton(int btn) {
-	XTestFakeButtonEvent(dpy, btn, False, CurrentTime);
+static void select_events(Display *dpy, Window win) {
+    XIEventMask evmasks[1];
+    unsigned char mask1[(XI_LASTEVENT + 7)/8];
+
+    memset(mask1, 0, sizeof(mask1));
+
+    /* select for button and key events from all master devices */
+    XISetMask(mask1, XI_RawButtonPress);
+    XISetMask(mask1, XI_RawButtonRelease);
+
+    evmasks[0].deviceid = XIAllMasterDevices;
+    evmasks[0].mask_len = sizeof(mask1);
+    evmasks[0].mask = mask1;
+
+    XISelectEvents(dpy, win, evmasks, 1);
     XFlush(dpy);
 }
 
+static void getmousepos(int *px, int *py) {
+	Window r, child;
+	int rx, ry;
+	unsigned int mask;
+	XQueryPointer(dpy, root, &r,  &child, px, py, &rx, &ry, &mask);
+}
+
+static void* loop() {
+	int px, py, lx, ly, dx, dy;
+	while (1) {
+		lx =  px, ly = py;
+		getmousepos(&px, &py);
+		dx = px - lx;
+		dy = py - ly;
+		printf("(%d, %d) from (%d, %d)\n", px, py, sx, sy);
+		sleep(1);
+
+
+	}
+}
+
+static void mouse_down(XIRawEvent *xev) {
+	getmousepos(&sx, &sy);
+	
+	printf("Button pressed %d @ %d, %d\n", xev->detail, sx, sy);
+
+}
+
+static void mouse_up(XIRawEvent *xev) {
+	sx = -1;
+	sy = -1;
+	printf("Button released %d %d\n", xev->detail);
+}
 
 int main(int argc, const char **argv) {
-	
+	XInitThreads();
 	for (int i = 1; i < argc; i++) {
 		if (argv[i][1] == 'h') {
 			fprintf(stdout, "there is no help to be given\n");
@@ -38,33 +81,36 @@ int main(int argc, const char **argv) {
 	
 	fprintf(stdout, "waiting for events\n");
 
-	const long mask = ButtonPressMask|ButtonReleaseMask;
-//	XGrabPointer(dpy, root, True, mask, GrabModeSync, GrabModeAsync, None, None, CurrentTime);
-	XGrabButton(dpy, 2, AnyModifier, root, True, mask, GrabModeSync, GrabModeAsync, None, None);
-	//XSelectInput(dpy, root, KeyPressMask | KeyReleaseMask | ButtonPressMask | ButtonReleaseMask);
-
 	XEvent ev;
-	XButtonEvent *eb;
+	XIEvent *xi_event;
+	XIRawEvent *xev;
+	XGenericEventCookie *cookie = &ev.xcookie;
 	
-	int grab = 0; 
+	select_events(dpy, root);
+
+	pthread_t id[2];
+	pthread_create(&id[0], NULL, loop, &argv);
 	
 	for (;;) {
-		XNextEvent(dpy, &ev);
-		if (ev.type == ButtonPress) {
-			eb = &ev.xbutton;
-			printf("%d button pressed!\n", eb->button);
-//			XGrabPointer(dpy, root, True, PointerMotionMask|ButtonReleaseMask, GrabModeAsync, GrabModeAsync, None, None, CurrentTime);
-
-		} else if (ev.type == ButtonRelease) {
-			eb = &ev.xbutton;
-			printf("%d button released!\n", eb->button);
-			//releaseButton(2);
-		//	XUngrabPointer(dpy, CurrentTime);			
+		if (XCheckTypedEvent(dpy, GenericEvent ,&ev)) {
+			if (cookie->type != GenericEvent || !XGetEventData(dpy, cookie)) {
+				continue;
 			}
 
-		XAllowEvents(dpy, ReplayPointer, CurrentTime);
-		XSync(dpy, 0);
-//		XFlush(dpy);
+
+			xi_event = (XIEvent *) cookie->data;
+			xev = (XIRawEvent *) xi_event;
+			switch (cookie->evtype) {
+				case XI_RawButtonPress:
+					if (xev->detail == 2) mouse_down(xev);
+					break;
+				case XI_RawButtonRelease:
+					if (xev->detail == 2) mouse_up(xev);
+					break;
+			}
+	
+			XFreeEventData(dpy, cookie);
+		}
 	}
 	XCloseDisplay(dpy);
 	return 0;

window.c

@@ -0,0 +1,32 @@
+#include <X11/Xlib.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main(int argc, const char **argv) {
+	Display *d;
+	XEvent e;
+	const char *message = "do you see the fun in gcc?";
+	
+	d = XOpenDisplay(NULL);
+	if (d == NULL) {
+		fprintf(stderr, "error opening display\n");
+		exit(1);
+	}
+
+	int s = DefaultScreen(d);
+	Window w = XCreateSimpleWindow(d, RootWindow(d, s), 10, 10, 100, 100, 1, BlackPixel(d, s), WhitePixel(d, s));
+	
+	XSelectInput(d, w, ExposureMask | KeyPressMask);
+	XMapWindow(d, w);
+	
+	while (1) {
+		XNextEvent(d, &e);
+		if (e.type == Expose) {
+			XDrawString(d, w, DefaultGC(d, s), 10, 50, message, strlen(message));
+		}	
+	}
+
+	XCloseDisplay(d);
+	return 0;
+}