30 lines
874 B
Ruby
30 lines
874 B
Ruby
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#!/usr/bin/env ruby
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require 'open3'
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# Wait until the given PID had no network activity for `Timeout` seconds, then exit.
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pid = ARGV.first
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Timeout = 2
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stdin, out, err, wait_thread = Open3.popen3("strace -f -e trace=network -s 1 -q -p #{pid}")
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while IO.select([err], nil, nil, Timeout)
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begin
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out = err.read_nonblock(1 << 10)
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rescue EOFError
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status = wait_thread.value
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if status.success?
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puts "Monitored process #{pid} exited"
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exit 0
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else
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puts "Strace failed with exit code #{status.to_i}. Last output:\n#{out}"
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# strace often fails with code 256 which looks like success to shells. fail with 1 instead.
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exit 1
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end
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end
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end
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# If we exit without an explicit kill,
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# ptrace can fail on reattachment: ptrace(PTRACE_SEIZE, $PID): Operation not permitted
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# Only relevant for testing.
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Process.kill("TERM", wait_thread.pid)
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