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/*------------------------------------------------------------------------
* What happens if you stuff the X11 server with large and large amounts
* of atoms? When does it run out of memory? How is its performance
* impaired by this? This is a little program to experimenting with
* torturing the X11 server by overfeeding it with atoms.
*
* (c) 2013 datenwolf
*
* License agreement: This source code is provided "as is". You
* can use this source code however you want for your own personal
* use. If you give this source code to anybody else then you must
* leave this message in it.
------------------------------------------------------------------------*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <X11/Xatom.h>
#include <X11/Xutil.h>
static int Xscreen;
static Display *Xdisplay;
char const doitkey[] = "wastemyX11server";
int main(int argc, char *argv[])
{
unsigned int i;
if( argc < 2 || strcmp(argv[1], doitkey) ) {
fprintf(stderr,
"***************** WARNING! *****************\n"
"\n"
"This program wastes serious resources of the\n"
"X11 server it is started on. Do not execute\n"
"this program on a production X11 session as\n"
"the allocated resources can not be reclaimed\n"
"without resetting or quiting the X11 server.\n"
"\n"
"To actually perform this, do the following:\n"
"\n"
"%s %s\n"
"\n"
"***************** WARNING! *****************\n",
argv[0], doitkey);
return 0;
}
Xdisplay = XOpenDisplay(NULL);
if (!Xdisplay) {
fprintf(stderr, "Couldn't connect to X server\n");
return -1;
}
Xscreen = DefaultScreen(Xdisplay);
unsigned int r = getpid() ^ time(NULL);
for(i=0; i < 0xffffffff; i++) {
char atomstr[33];
snprintf(atomstr,32, "_wasted_0x%08x_0x%08x", r, i);
XInternAtom(Xdisplay, atomstr, False);
if( !(i % 0x00010000 ) ) {
fprintf(stderr, "%s\n", atomstr);
}
}
return 0;
}
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