When the program starts executing due to a gdb command such as
step or continue,
^Z^Zstarting
is output. When the program stops,
^Z^Zstopped
is output. Before the stopped annotation, a variety of
annotations describe how the program stopped.
^Z^Zexited exit-status
The program exited, and exit-status is the exit status (zero for
successful exit, otherwise nonzero).
^Z^Zsignalled
The program exited with a signal. After the ^Z^Zsignalled, the
annotation continues:
intro-text
^Z^Zsignal-name
name
^Z^Zsignal-name-end
middle-text
^Z^Zsignal-string
string
^Z^Zsignal-string-end
end-text
where name is the name of the signal, such as SIGILL or
SIGSEGV, and string is the explanation of the signal, such
as Illegal Instruction or Segmentation fault.
intro-text, middle-text, and end-text are for the
user's benefit and have no particular format.
^Z^Zsignal
The syntax of this annotation is just like signalled, but gdb is
just saying that the program received the signal, not that it was
terminated with it.
