# open_ex: ['ssh','-O','check','-T','-S','/root/.libnet-openssh-perl/user-10.253.10.10-25248-962213','-l','user','10.253.10.10','--']
# _waitpid(25251) => pid: 25251, rc: 0, err:
# open_ex: ['ssh','-S','/root/.libnet-openssh-perl/user-10.253.10.10-25248-962213','-l','user','10.253.10.10','--']
Pseudo-terminal will not be allocated because stdin is not a terminal.
# _waitpid(25252) => pid: 25252, rc: 65280, err:
Couldn't run remote command: child exited with code 255 at script.pl line 42.
# open_ex: ['ssh','-O','exit','-T','-S','/root/.libnet-openssh-perl/user-10.253.10.10-25248-962213','-l','user','10.253.10.10','--']
# _waitpid(25253) => pid: 25253, rc: 0, err: