Merge branch 'master' into dev

wangzhengquan

2021-01-18 fb3f4f606659af9cbf10b0b6710fb80fcaec5627

1
2
3
4
5
ipcrm -a
 
./dgram_mod_req_rep server 2 & node0=$! && sleep 1
./dgram_mod_req_rep client 2 node1
kill $node0