This lets one interrupt DDB's output, which is useful if paging is
disabled and the output device is slow.
This follows a previous implementation in svn r311952 / git
5fddef79998678d256ba30316353393b4d8ebb32 which was reverted because it
broke DDB type-ahead.
Now, try this again, but with a 512-byte type-ahead buffer. This will stillWhile there
result in a limit on the amount of type aheadis buffer space, being the buffer size.control input is handled and non-control input is
So, this may still result in truncation of buffered input. This couldbuffered. When the buffer is exhausted, the default is to print a
effect for example pasting a large script with multiple commands intowarning and drop further non-control input in order to continue handling
the control input. sysctl debug.ddb.prioritize_control_input can be set to
0 to instead preserve all input but lose immediate handling of control
input. This could for example effect pasting of a large script into the