resize the buf allocation as dynamic allocate.

fujuntang

2021-09-07 a300adf15342aa4d3b030698d40d61edb6272ea0

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ipcrm -a
rm *.txt
./test_lostdata
sort -n c.txt  > c1.txt
sort -n p.txt  > p1.txt
diff -u p1.txt c1.txt