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vncs: create dummy /dev/mousein and /dev/mousectl files

this should prevent accidential fiddeling with the kernels
mouse driver.

--- a/sys/src/cmd/vnc/devmouse.c

+++ b/sys/src/cmd/vnc/devmouse.c

@@ -53,6 +53,8 @@

 	Qdir,

 	Qcursor,

 	Qmouse,

+	Qmousein,

+	Qmousectl,

 };

 static Dirtab mousedir[]={

@@ -59,6 +61,8 @@

 	".",	{Qdir, 0, QTDIR},	0,			DMDIR|0555,

 	"cursor",	{Qcursor},	0,			0666,

 	"mouse",	{Qmouse},	0,			0666,

+	"mousein",	{Qmousein},	0,			0222,

+	"mousectl",	{Qmousectl},	0,			0222,

 };

 static uchar buttonmap[8] = {

@@ -122,6 +126,10 @@

 		mouse.open = 1;

 		mouse.ref++;

 		unlock(&mouse);

+		break;

+	case Qmousein:

+	case Qmousectl:

+		error(Egreg);	/* dummy */

 		break;

 	default:

 		incref(&mouse);

-- 

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