On Monday 15 October 2007 8:15:29 pm Jeff Carr wrote: > Has anyone looked into finding a way to pass SIGWINCH through to the > guest? I started looking at linux-user/signal.c. > > For those that might not be familiar with SIGWINCH, supporting it > would allow qemu -nographic to tell when the terminal is a different > size than 80x24.
The problem is a serial port is essentially a pipe. You don't get tty information about the terminal plugged into the other side, because that's a separate machine on the other side of a piece of hardware which doesn't pass through that info. (What _is_ the width and height of a modem?) Have your program send an ansi probe sequence: echo -e "\e[s\e[999C\e[999B\e[6n\e[u" Then parse the return string, which should look something like escape left bracket 25 semicolon 80 capital R, and use it to set $LINES=25 and $COLUMNS=80. Any modern terminal program should handle that and spit back a result telling you big the tty is (although it doesn't tell you when it _changes_, you have to re-probe). Yes, it's in-band signalling but over a serial connection that's all you've got. Rob -- "One of my most productive days was throwing away 1000 lines of code." - Ken Thompson.
