add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/scripts/diffconfig
..
..
@@ -65,7 +65,7 @@
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         else:
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             print(" %s %s -> %s" % (config, value, new_value))
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-def main():
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+def show_diff():
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     global merge_style
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     # parse command line args
..
..
@@ -129,4 +129,16 @@
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     for config in new:
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         print_config("+", config, None, b[config])
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-main()
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+def main():
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+    try:
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+        show_diff()
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+    except BrokenPipeError:
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+        # Python flushes standard streams on exit; redirect remaining output
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+        # to devnull to avoid another BrokenPipeError at shutdown
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+        devnull = os.open(os.devnull, os.O_WRONLY)
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+        os.dup2(devnull, sys.stdout.fileno())
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+        sys.exit(1)  # Python exits with error code 1 on EPIPE
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+
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+
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+if __name__ == '__main__':
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+    main()