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iostats: dup 9p pipe to both fd 0 and fd 1 for exportfs

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

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

@@ -354,6 +354,7 @@

 		sysfatal("fork: %r");

 	case 0:

 		dup(efd[0], 0);

+		dup(efd[0], 1);

 		close(efd[0]);

 		close(efd[1]);

 		close(pfd[1]);