89 lines
1.7 KiB
C++
89 lines
1.7 KiB
C++
#ifndef TEST_X11MON
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/* Copyright (C) 2006 J.F.Dockes */
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// Poll state of X11 connectibility (to detect end of user session).
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#include "autoconfig.h"
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#ifndef DISABLE_X11MON
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#include <stdio.h>
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#include <X11/Xlib.h>
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#include <signal.h>
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#include <setjmp.h>
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#define DODEBUG
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#ifdef DODEBUG
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#define DEBUG(X) fprintf X
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#else
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#define DEBUG(X) fprintf X
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#endif
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static Display *m_display;
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static bool m_ok;
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static jmp_buf env;
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static int errorHandler(Display *, XErrorEvent*)
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{
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DEBUG((stderr, "x11mon: error handler: Got X11 error\n"));
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m_ok = false;
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return 0;
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}
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static int ioErrorHandler(Display *)
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{
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DEBUG((stderr, "x11mon: error handler: Got X11 IO error\n"));
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m_ok = false;
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m_display = 0;
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longjmp(env, 1);
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}
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bool x11IsAlive()
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{
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// Xlib always exits on IO errors. Need a setjmp to avoid this (will jump
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// from IO error handler instead of returning).
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if (setjmp(env)) {
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DEBUG((stderr, "x11IsAlive: Long jump\n"));
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return false;
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}
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if (m_display == 0) {
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signal(SIGPIPE, SIG_IGN);
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XSetErrorHandler(errorHandler);
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XSetIOErrorHandler(ioErrorHandler);
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if ((m_display = XOpenDisplay(0)) == 0) {
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DEBUG((stderr, "x11IsAlive: cant connect\n"));
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m_ok = false;
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return false;
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}
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}
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m_ok = true;
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bool sync= XSynchronize(m_display, true);
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XNoOp(m_display);
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XSynchronize(m_display, sync);
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return m_ok;
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}
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#else
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bool x11IsAlive()
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{
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return true;
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}
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#endif /* DISABLE_X11MON */
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#else
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// Test driver
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "x11mon.h"
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int main(int argc, char **argv)
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{
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for (;;) {
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if (!x11IsAlive()) {
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fprintf(stderr, "x11IsAlive failed\n");
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} else {
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fprintf(stderr, "x11IsAlive Ok\n");
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}
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sleep(1);
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}
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}
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#endif
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