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plan9: don't just quit on exit menu hit, ask for confirmation

--- a/plan9.c

+++ b/plan9.c

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

 #include <keyboard.h>

 #include <thread.h>

 #include <plumb.h>

+#include <cursor.h>

 #define MIN(x,y) ((x)<=(y)?(x):(y))

 #define MAX(x,y) ((x)>=(y)?(x):(y))

@@ -103,6 +104,20 @@

 static int numsnaps, nextsnap;

 static int maxsnaps = 100;

+Cursor quitcursor = {

+	{0, 0},

+	{ 0xf7, 0xfe, 0x15, 0x54, 0x1d, 0x54, 0x09, 0x54,

+	  0x09, 0xdc, 0x00, 0x00, 0x75, 0x77, 0x45, 0x54,

+	  0x75, 0x66, 0x15, 0x54, 0x77, 0x57, 0x00, 0x00,

+	  0x00, 0x02, 0x2a, 0x84, 0x11, 0x28, 0x2a, 0x90,

+	},

+	{ 0xea, 0x2b, 0xea, 0xab, 0xe2, 0xab, 0xf6, 0xab,

+	  0xf6, 0x23, 0xff, 0xff, 0x8a, 0x88, 0xba, 0xab,

+	  0x8a, 0x99, 0xea, 0xab, 0x88, 0xa8, 0xff, 0xff,

+	  0xff, 0xfd, 0xd5, 0x7b, 0xee, 0xd7, 0xd5, 0x6f,

+	},

+};

+

 static struct {

 	struct {

 		char *menu;

@@ -1575,7 +1590,16 @@

 				} else if (n == Menu3colors) {

 					proccreate(colorsproc, nil, mainstacksize);

 				} else if (n == Menu3exit) {

-					goto end;

+					setcursor(mctl, &quitcursor);

+					for (;;) {

+						if (recv(mctl->c, &m) == 1) {

+							if (m.buttons == 4)

+								goto end;

+							if (m.buttons)

+								break;

+						}

+					}

+					setcursor(mctl, nil);

 				}

 				complete = true;

 			} else {