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screenlock: blank screen using /dev/mousectl (thanks sl)

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

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

@@ -8,7 +8,6 @@

 char pic[] = "/lib/bunny.bit";

-int vgactl;

 int debug;

 int doblank;

 int chatty = 0;

@@ -16,16 +15,6 @@

 char user[256];

 void

-blankscreen(int blank)

-{

-	if(vgactl < 0)

-		return;

-	seek(vgactl, 0, 0);

-	if(fprint(vgactl, blank? "blank": "unblank") < 0)

-		fprint(2, "blankscreen: can't blank: %r\n");

-}

-

-void

 error(char *fmt, ...)

 {

 	Fmt f;

@@ -122,7 +111,6 @@

 			fprint(2, "%s's screenlock password: ", user);

 		memset(buf, 0, sizeof buf);

 		readline(buf, sizeof buf);

-		blankscreen(0);

 		if(chatty || !must)

 			fprint(2, "\n");

 		if(buf[0] == '\0' || buf[0] == '\04'){

@@ -142,14 +130,16 @@

 		doblank = 1;

 	}

 	memset(buf, 0, sizeof buf);

-	blankscreen(0);

 }

 void

 blanker(void *)

 {

-	int tics;

+	int fd, tics;

+	fd = open("/dev/mousectl", OWRITE);

+	if(fd < 0)

+		return;

 	tics = 0;

 	for(;;){

 		if(doblank > 0){

@@ -157,7 +147,7 @@

 			tics = 10;

 		}

 		if(tics > 0 && --tics == 0)

-			blankscreen(1);

+			write(fd, "blank", 5);

 		sleep(1000);

 	}

 }

@@ -268,10 +258,6 @@

 threadmain(int argc, char *argv[])

 {

 	readfile("#c/user", user, sizeof user, 1);

-

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

-		vgactl = open("#v/vgactl", OWRITE);

-

 	ARGBEGIN{

 	case 'd':

 		debug++;