Import LinuxCNC source tree

tests/halmodule.1/stream_writer.py

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+#!/usr/bin/env python3
+import hal
+import time
+c = hal.component("stream_writer")
+writer = hal.stream(c, hal.streamer_base, 10, "bfsu")
+
+for i in range(9):
+    assert writer.writable
+    writer.write((i % 2, i, i, i))
+assert not writer.writable
+assert writer.num_overruns == 0
+try:
+    writer.write((1,1,1,1))
+except:
+    pass
+else:
+    assert False, "failed to get exception on full stream"
+assert writer.num_overruns == 1
+c.ready()
+
+try:
+    while 1: time.sleep(1)
+except KeyboardInterrupt: pass