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name : net_helper.sh

 #!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# Helper functions

wait_local_port_listen()
{
	local listener_ns="${1}"
	local port="${2}"
	local protocol="${3}"
	local pattern
	local i

	pattern=":$(printf "%04X" "${port}") "

	# for tcp protocol additionally check the socket state
	[ ${protocol} = "tcp" ] && pattern="${pattern}0A"
	for i in $(seq 10); do
		if ip netns exec "${listener_ns}" awk '{print $2" "$4}' \
		   /proc/net/"${protocol}"* | grep -q "${pattern}"; then
			break
		fi
		sleep 0.1
	done
}

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