code: 9ferno

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added prints on errors

--- a/emu/port/sysfile.c

+++ b/emu/port/sysfile.c

@@ -608,11 +608,14 @@

 	volatile struct { Chan *c; } c;

 	vlong off;

-	if(waserror())

+	if(waserror()){

+		print("rread fd %d va 0x%p n %d offp %lld fdtochan failed: %r\n", fd, va, n, offp);

 		return -1;

+	}

 	c.c = fdtochan(up->env->fgrp, fd, OREAD, 1, 1);

 	if(waserror()){

+		print("rread fd %d va 0x%p n %d offp %lld fdtochan failed: %r\n", fd, va, n, offp);

 		cclose(c.c);

 		nexterror();

 	}