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lib9p: open internal file-descriptor with OCEXEC flag in getremotesys()

--- a/sys/src/lib9p/listen.c

+++ b/sys/src/lib9p/listen.c

@@ -100,7 +100,7 @@

 	snprint(buf, sizeof buf, "%s/remote", ndir);

 	sys = nil;

-	fd = open(buf, OREAD);

+	fd = open(buf, OREAD|OCEXEC);

 	if(fd >= 0){

 		n = read(fd, buf, sizeof(buf)-1);

 		if(n>0){

-- 

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