Merge branch 'master' into dev

wangzhengquan

2021-01-18 24641678c68b5eadafa49c9341c7fcbfcff28262

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ipcrm -a
 
./dgram_mod_req_rep server 2 & node0=$! && sleep 1
./dgram_mod_req_rep client 2 node1
kill $node0