keyhook.c
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// !!! FIXME: this is X11 specific. :(
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <unistd.h>
#include <X11/Xlib.h>
#include <X11/Xlibint.h>
#include <X11/extensions/record.h>
#include "keyhook.h"
static volatile int keyPressFlags = 0;
static volatile int sawKeyCombo = 0;
static void keyhookCallback(XPointer priv, XRecordInterceptData *data)
{
const xEvent *xev = (const xEvent *) data->data;
if (data->category == XRecordFromServer)
{
const BYTE keycode = xev->u.u.detail;
if (xev->u.u.type == KeyPress)
{
// !!! FIXME: don't hardcode these keycodes.
if ((keycode == 64) && (keyPressFlags == 0))
keyPressFlags++;
else if ((keycode == 133) && (keyPressFlags == 1))
keyPressFlags++;
else if ((keycode == 51) && (keyPressFlags == 2))
{
sawKeyCombo = 1;
keyPressFlags = 0;
} // else if
else
keyPressFlags = 0;
} // if
else if (xev->u.u.type == KeyRelease)
{
keyPressFlags = 0;
} // else if
} // if
XRecordFreeData(data);
} // keyhookCallback
// every example I've seen needs two Display connections...one for the
// keyhook, and one to control it.
static Display *ctrldpy = NULL;
static Display *datadpy = NULL;
static XRecordContext xrc = 0;
int initKeyHook(void)
{
int major = 0;
int minor = 0;
XRecordRange *xrr = NULL;
XRecordClientSpec xrcs = XRecordAllClients;
if (ctrldpy)
return 0; // already initialized.
ctrldpy = XOpenDisplay(NULL);
if (!ctrldpy)
goto failed;
XSynchronize(ctrldpy, True);
datadpy = XOpenDisplay(NULL);
if (!datadpy)
goto failed;
else if (!XRecordQueryVersion(ctrldpy, &major, &minor))
goto failed;
else if ((xrr = XRecordAllocRange()) == NULL)
goto failed;
memset(xrr, '\0', sizeof (*xrr));
xrr->device_events.first = KeyPress;
xrr->device_events.last = KeyPress;
if ((xrc = XRecordCreateContext(ctrldpy, 0, &xrcs, 1, &xrr, 1)) == 0)
goto failed;
else if (!XRecordEnableContextAsync(datadpy, xrc, keyhookCallback, NULL))
goto failed;
XFree(xrr);
xrr = NULL;
return 1;
failed:
deinitKeyHook();
if (xrr) XFree(xrr);
return 0;
} // initKeyHook
void deinitKeyHook(void)
{
if (ctrldpy)
{
if (xrc)
{
XRecordDisableContext(ctrldpy, xrc);
XRecordFreeContext(ctrldpy, xrc);
} // if
XCloseDisplay(ctrldpy);
} // if
if (datadpy)
XCloseDisplay(datadpy);
ctrldpy = NULL;
datadpy = NULL;
xrc = 0;
sawKeyCombo = 0;
keyPressFlags = 0;
} // deinitKeyHook
int pumpKeyHook(void)
{
if (!datadpy)
return 0;
sawKeyCombo = 0;
XRecordProcessReplies(datadpy);
return sawKeyCombo;
} // pumpKeyHook
// end of keyhook.c ...