[Crash-utility] Question on prompt behavior

hi crash-utility community, When stdin is not a TTY, but all the other flags remain the same, prompt ("crash> ") won't be displayed. An example use case is, the stdin of crash is replaced by a piped fd connected to another process. In process_command_line(), it checks if pc->flags does NOT have any of the flag: READLINE|SILENT|CMDLINE_IFILE|RCHOME_IFILE|RCLOCAL_IFILE, a prompt should be printed. But in setup_environment(), pc->flags is set to have READLINE flag[2], the above check will not be true at all. Should READLINE be set for all cases in setup_environment()? - If true, should the check in process_command_line() look for TTY instead of READLINE? Since if pc->flags has TTY, [2] won't be true and the prompt will be printed later in TTY's case[3]. - If false, where should be a proper place and conditions to set READLINE? Or is the current behavior intended? I may not fully understand the design logic. Any explanations are appreciated. Thanks! [1] https://github.com/crash-utility/crash/blob/05a3a328fcd8920e49926b6d1c9c8... [2] https://github.com/crash-utility/crash/blob/8246dce99dd23457e8c7a3fe9609c... [3] https://github.com/crash-utility/crash/blob/05a3a328fcd8920e49926b6d1c9c8...