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kbdfs: kill input buffer on interrupt key

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

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

@@ -564,12 +564,13 @@

 		do {

 			recv(cook, &r);

 			switch(r){

+			case Kdel:

+				if(notefd < 0)

+					continue;

+				write(notefd, "interrupt", 9);

+				/* no break */

 			case '\0':	/* flush */

 				nr = 0;

-				continue;

-			case Kdel:

-				if(notefd >= 0)

-					write(notefd, "interrupt", 9);

 				continue;

 			case Kbs:	/* ^H: erase character */

 			case Knack:	/* ^U: erase line */

-- 

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