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kbdfs: mouse button 2 emulation by changing mouse buttonmap when shift is pressed

--- a/sys/src/9/boot/bootrc

+++ b/sys/src/9/boot/bootrc

@@ -5,7 +5,7 @@

 unmount /root

 bind -q '#p' /proc

-for(i in S f k æ t)

+for(i in S f k æ t m)

 	bind -a '#'^$i /dev >/dev/null >[2=1]

 # make variables settable by copying them from #ec

--- a/sys/src/cmd/aux/kbdfs/kbdfs.c

+++ b/sys/src/cmd/aux/kbdfs/kbdfs.c

@@ -88,6 +88,7 @@

 int scanfd;

 int ledsfd;

 int consfd;

+int mctlfd;

 int kbdopen;

 int consctlopen;

@@ -391,10 +392,21 @@

 			}

 			rb[0] = 'k';

 		}

-		if(rb[0] && kbdopen){

-			s = utfconv(rb, nb+1);

-			if(nbsendp(kbdchan, s) <= 0)

-				free(s);

+		if(rb[0]){

+			if(key.r == Kshift && mctlfd >= 0){

+				if(key.down){

+					fprint(mctlfd, "buttonmap 132");

+				} else {

+					fprint(mctlfd, "swap");

+					fprint(mctlfd, "swap");

+				}

+			}

+

+			if(kbdopen){

+				s = utfconv(rb, nb+1);

+				if(nbsendp(kbdchan, s) <= 0)

+					free(s);

+			}

 		}

 	}

 }

@@ -1259,6 +1271,8 @@

 		fprint(2, "%s: warning: can't open /dev/scancode: %r\n", argv0);

 	if((ledsfd = open("/dev/leds", OWRITE)) < 0)

 		fprint(2, "%s: warning: can't open /dev/leds: %r\n", argv0);

+	if((mctlfd = open("/dev/mousectl", OWRITE)) < 0)

+		fprint(2, "%s: warning: can't open /dev/mousectl: %r\n", argv0);

 	if(*argv)

 		if((consfd = open(*argv, OREAD)) < 0)