45 lines
831 B
C
45 lines
831 B
C
#include <X11/Xlib.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <unistd.h>
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#include <string.h>
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static void die(const char *errstr);
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void die(const char *errstr) {
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fputs(errstr, stderr);
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exit(EXIT_FAILURE);
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}
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void show(Display *dpy, int root, struct tm *tm)
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{
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char s[6];
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strftime(s, sizeof(s), "%H:%M", tm);
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XStoreName(dpy, root, s);
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XSync(dpy, True);
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}
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int main() {
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Display *dpy;
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int root, h, m, init = 60;
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time_t t;
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struct tm *tm;
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if (!(dpy = XOpenDisplay(NULL)))
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die("lupan-clock: cannot open display\n");
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root = DefaultRootWindow(dpy);
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while (1) {
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t = time(NULL);
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tm = localtime(&t);
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if (tm->tm_hour != h || tm->tm_min != m || init > 0) {
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show(dpy, root, tm);
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h = tm->tm_hour;
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m = tm->tm_min;
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init = (init > 0) ? init - 1 : 0;
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}
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sleep(1);
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}
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return 1;
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}
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