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--- a/sys/src/cmd/screenlock.c

+++ b/sys/src/cmd/screenlock.c

@@ -119,14 +119,19 @@

 void

 top(void*)

 {

-	int fd;

+	int fd, n;

+	char buf[128];

-	if((fd = open("/dev/wctl", OWRITE)) < 0)

+	if((fd = open("/dev/wctl", ORDWR)) < 0)

 		return;

 	for(;;){

-		write(fd, "current", 7);

-		sleep(500);

+		n = read(fd, buf, sizeof buf-1);

+		if(n > 48){

+			buf[n] = '\0';

+			if(strstr(buf+48, "notcurrent"))

+				write(fd, "current", 7);

+		}

 	}

 }

@@ -186,7 +191,7 @@

 		tm = localtime(time(&blank));

 		s = smprint("user %s at %d:%02.2d", getuser(), tm->hour, tm->min);

 		p = subpt(p, Pt(stringwidth(font, "m") * strlen(s) / 2, 0));

-		string(screen, p, screen->display->white, ZP, font, s);

+		stringbg(screen, p, display->white, ZP, font, s, display->black, ZP);

 	}

 	flushimage(display, 1);

-- 

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