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@jld
Created April 15, 2021 03:29
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Print how many clients the X server has (including this one)
/* Link with -lXRes -lX11 */
#include <X11/Xlib.h>
#include <X11/extensions/XRes.h>
#include <stdio.h>
int main() {
Display *display = NULL;
XResClient *clients = NULL;
int num_client = 0;
int ret = 1;
int event_base, error_base;
display = XOpenDisplay(NULL);
if (!display) {
fprintf(stderr, "Failed to open display.\n");
goto out;
}
if (!XResQueryExtension(display, &event_base, &error_base)) {
fprintf(stderr, "XRes not supported.\n");
goto out;
}
if (!XResQueryClients(display, &num_client, &clients)) {
fprintf(stderr, "QueryClients failed.\n");
goto out;
}
printf("%d\n", num_client);
ret = 0;
out:
XFree(clients);
if (display) {
XCloseDisplay(display);
}
return ret;
}
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