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rio: open /dev/snarf with OCEXEC flag when writing

--- a/sys/src/cmd/rio/rio.c

+++ b/sys/src/cmd/rio/rio.c

@@ -244,7 +244,7 @@

 	if(snarffd<0 || nsnarf==0)

 		return;

-	fd = open("/dev/snarf", OWRITE);

+	fd = open("/dev/snarf", OWRITE|OCEXEC);

 	if(fd < 0)

 		return;

 	/* snarf buffer could be huge, so fprint will truncate; do it in blocks */