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Topen implemented Implement Topen plus some basic testing. ORCLOSE (remove file when the fid is clunked) is mapped to O_CLOEXEC and tried to be honoured on fid_free. "vanilla" 9P2000 uses reads on directories to list the entries while 9P2000.L (and .U too possibly) introduces an explicit Treaddir. I'm planning to support 9P2000-style read-on-dir but not yet.
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 1 021481ca 2021-12-13 op include "lib.9ps"

 2 021481ca 2021-12-13 op 

 3 021481ca 2021-12-13 op testing "open + clunk works" dir "./root" {

 4 021481ca 2021-12-13 op 	mount(0, "/")

 5 021481ca 2021-12-13 op 	walk(0, 1, "dir", "subdir", "file")

 6 021481ca 2021-12-13 op 	walk-ok()

 7 021481ca 2021-12-13 op 

 8 021481ca 2021-12-13 op 	open(1, OREAD)

 9 021481ca 2021-12-13 op 	m = recv()

10 021481ca 2021-12-13 op 	assert m.type == Ropen

11 021481ca 2021-12-13 op 

12 021481ca 2021-12-13 op 	clunk(1)

13 021481ca 2021-12-13 op 	m = recv()

14 021481ca 2021-12-13 op 	assert m.type == Rclunk

15 021481ca 2021-12-13 op }