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/*
* x11misc.c: miscellaneous stuff for dealing directly with X servers.
*/
#include <ctype.h>
#include <unistd.h>
#include <assert.h>
#include <stdlib.h>
#include <errno.h>
#include "putty.h"
#ifndef NOT_X_WINDOWS
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xatom.h>
#include "x11misc.h"
/* ----------------------------------------------------------------------
* Error handling mechanism which permits us to ignore specific X11
* errors from particular requests. We maintain a list of upcoming
* potential error events that we want to not treat as fatal errors.
*/
static int (*orig_x11_error_handler)(Display *thisdisp, XErrorEvent *err);
struct x11_err_to_ignore {
Display *display;
unsigned char error_code;
unsigned long serial;
};
static struct x11_err_to_ignore *errs;
static size_t nerrs, errsize;
static int x11_error_handler(Display *thisdisp, XErrorEvent *err)
{
for (size_t i = 0; i < nerrs; i++) {
if (thisdisp == errs[i].display &&
err->serial == errs[i].serial &&
err->error_code == errs[i].error_code) {
/* Ok, this is an error we're happy to ignore */
return 0;
}
}
return (*orig_x11_error_handler)(thisdisp, err);
}
void x11_ignore_error(Display *disp, unsigned char errcode)
{
/*
* Install our error handler, if we haven't already.
*/
if (!orig_x11_error_handler)
orig_x11_error_handler = XSetErrorHandler(x11_error_handler);
/*
* This is as good a moment as any to winnow the ignore list based
* on requests we know to have been processed.
*/
{
unsigned long last = LastKnownRequestProcessed(disp);
size_t i, j;
for (i = j = 0; i < nerrs; i++) {
if (errs[i].display == disp && errs[i].serial <= last)
continue;
errs[j++] = errs[i];
}
nerrs = j;
}
sgrowarray(errs, errsize, nerrs);
errs[nerrs].display = disp;
errs[nerrs].error_code = errcode;
errs[nerrs].serial = NextRequest(disp);
nerrs++;
}
#endif
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