vtysh bug

[jx_wq]

When I exit vtysh and go back to shell, I can't see the input command string. 
But the command still can be executed if press enter.
Possible reason: processing of "exit" command in vtysh used "exit(0)" system 
calls, which didn't close the pipe opened by "popen" system call. 

zebra version: 0.93a
os version: red hat linux 7.1
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