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rc: ignore sigwinch trap when theres no handler

--- a/sys/src/cmd/rc/trap.c

+++ b/sys/src/cmd/rc/trap.c

@@ -29,6 +29,9 @@

 			 */

 			while(!runq->iflag) Xreturn();

 		}

+		else if(strcmp(trapreq->name, "sigwinch") == 0){

+			/* ignore if theres no handler */

+		}

 		else Exit();

 	}

 }

-- 

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