yang zhang commented: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/300#note_114724


I'm trying porting ssh.
Currently ssh work on no-pty mode, shell's stdin/stdout/stderr is redirected on 
socket pair, it does not support tcgetattr and tcsetattr.

When exiting ssh session shell, if tcgetattr failed, i think it is not 
neccessary to call tcsetattr again to avoid some unnecessary logs.
"PTY allocation request failed on channel 0

logs:
RTEMS Shell on no console. Use 'help' to list commands.
exit
hell: cannot reset terminal attributes (no console)"

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https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/300#note_114724
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