tools/testing/selftests/net/net_helper.sh

   1 #!/bin/bash
   2 # SPDX-License-Identifier: GPL-2.0
   3 #
   4 # Helper functions
   5
   6 wait_local_port_listen()
   7 {
   8         local listener_ns="${1}"
   9         local port="${2}"
  10         local protocol="${3}"
  11         local pattern
  12         local i
  13
  14         pattern=":$(printf "%04X" "${port}") "
  15
  16         # for tcp protocol additionally check the socket state
  17         [ ${protocol} = "tcp" ] && pattern="${pattern}0A"
  18         for i in $(seq 10); do
  19                 if ip netns exec "${listener_ns}" awk '{print $2" "$4}' \
  20                    /proc/net/"${protocol}"* | grep -q "${pattern}"; then
  21                         break
  22                 fi
  23                 sleep 0.1
  24         done
  25 }