4.4BSD snapshot (revision 8.1); add 1993 to copyright

new copyright; att/bsd/shared

from John Gilmore for gcc

port to tahoe by Nir peleg of CCI

Add copyright

changed to handle new px which sends itself a signal to breakpoint

modifications for running on a sun

changed "isatty" references to "isterm"

now checks if standard input is not a tty in "choose"
when about to ask whether or not to enter the debugger after an error
... the problem was when input was redirected and an error occurred
pdx

now checks if standard input is not a tty in "choose"
when about to ask whether or not to enter the debugger after an error
... the problem was when input was redirected and an error occurred
pdx would read from the input that was intended for the program

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muddled with "fetchpc", it now looks at the frame mask it see
if register 11 was saved as it wanders through the stack frames.
The last saved register 11 when unwinding corresponds to the
interpre

muddled with "fetchpc", it now looks at the frame mask it see
if register 11 was saved as it wanders through the stack frames.
The last saved register 11 when unwinding corresponds to the
interpreter's pc.

show more ...

slight change in the way signals are handled -- px now gets
all but interrupt, trap, and iot, it is assumed px handles the errors
and then sends itself a trap

fixed subtle frame pointer bug, made cosmetic change to how debugger is entered
when using "-r" or coming from pix

fixing -r option

date and time created 82/01/18 19:20:51 by linton