@catch_sigpipe decorator not working in rdump

[yunzheng]

It seems that the @catch_sigpipe decorator stopped working since this change in rdump that catches any exceptions in the finally block during exit:

    finally:
        if record_writer:
            # Exceptions raised in threads can be thrown when deconstructing the writer.
            try:
                record_writer.__exit__()
            except Exception as e:
                print_error(e)
                ret = 1

This should be investigated if RecordWriter.__exit__() needs to raise any exceptions at all.

[yunzheng]

To reproduce:

$ uv run python3 examples/tcpconn.py | uv run rdump | head -n 1
[reading from stdin]
<network/traffic/tcp/connection ts=2025-08-19 08:08:44.902173+00:00 src=net.ipv4.address('127.0.0.1') srcport=22 dst=net.ipv4.address('1.2.3.4') dstport=443>
2025-08-19 10:08:44,907 ERROR rdump encountered a fatal error: [Errno 32] Broken pipe
2025-08-19 10:08:44,907 ERROR rdump encountered a fatal error: [Errno 32] Broken pipe
Exception ignored on flushing sys.stdout:
BrokenPipeError: [Errno 32] Broken pipe