# These GDB commands should make watching tcsetattr failures much easier.  
# You can use them with UML in skas mode just by doing "gdb linux".  No 
# arguments are needed to demonstrate the problem.
#
# Pass signals through that UML uses.
handle SIGSEGV pass nostop noprint
handle SIGUSR1 pass nostop noprint
# Find out where tcsetattr is and try to guess where the breakpoint should 
# go.  We want the breakpoint just before tcsetattr returns.  You can always
# set it manually if this doesn't work.
x tcsetattr
set $tcsetattr_start = $_
set $tcsetattr_ret = $tcsetattr_start+17
# Set our breakpoint to run after a failed call to tcsetattr.  This should
# trigger just before tcsetattr returns with a non-zero return value.
break *$tcsetattr_ret
condition 1 $eax != 0
commands 1
silent
printf " *** tcsetattr failed, returned = %d, errno = %d *** \n", $eax, errno
c
end
# Break on panic so we don't lose our xterm when the kernel panics, which it
# should do as long as you run it without any arguments.
break panic
# Ok, time to run our test.  You don't have to use an xterm, but it will
# keep the error messages from printing out on your console.
r con=xterm