SRV_SST

Purpose:        Set server state

Input Syntax:   SRV_SST <s><m>

Input Params:   s  CHAR(1) = state
                             'o'=open, 'c'=close, 's'=shutdown
                m  CHAR(1) = modifier
                             'n'=normal, 't'=transactional, 'i'=immediate

Output Syntax:  +<message>

Output Params:  <message> CHAR(128) = human-readable message

Right required: R_USER_STATE

Implementation: f4adp_server.c / f4adp_server_set_state()

Remarks:        Signal  ftpd                      ftps
                HUP     nothing                   shutdown transactional
                INT     nothing                   close transactional
                QUIT    nothing                   kick transactional
                TERM    shutdown immediate        shutdown/close/kick at once
                USR1    dump user&group files     cancel shutdown/close
                USR2    dump statistics           nothing
