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#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/select.h>
#include <time.h>
#include <unistd.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
static inline unsigned long _RGB(int r, int g, int b)
{
return b + (g << 8) + (r << 16);
}
int main(void) {
Display *display = XOpenDisplay(NULL);
assert(display);
int fd = ConnectionNumber(display);
XVisualInfo vinfo;
XMatchVisualInfo(display, DefaultScreen(display), 32, TrueColor, &vinfo);
XSetWindowAttributes attribs;
attribs.colormap = XCreateColormap(display, DefaultRootWindow(display), vinfo.visual, AllocNone);
attribs.override_redirect = 1;
attribs.border_pixel = 0;
attribs.background_pixel = 0;
Window window = XCreateWindow(display, DefaultRootWindow(display), 10, 10, 24 / 2 * 8, 24, 0,
vinfo.depth, InputOutput, vinfo.visual,
CWColormap | CWOverrideRedirect | CWBorderPixel | CWBackPixel, &attribs);
XMapWindow(display, window);
Font font = XLoadFont(display, "*x24");
GC ctx = XCreateGC(display, window, 0, NULL);
XSetForeground(display, ctx, _RGB(255, 255, 255));
XSetFont(display, ctx, font);
for (;;) {
time_t t = time(NULL);
struct tm *tm = localtime(&t);
char buf[9];
strftime(buf, 9, "%H:%M:%S", tm);
XClearWindow(display, window);
XDrawString(display, window, ctx, 0, 24, buf, 8);
XEvent event;
while (XPending(display))
XNextEvent(display, &event);
fd_set set;
FD_ZERO(&set);
FD_SET(fd, &set);
select(fd + 1, &set, NULL, NULL, &(struct timeval) {1, 0});
}
}
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