stack: Improve error checking and exit code handling.
Check up front whether we attached correctly, if not error out. Make sure
callbacks report -1 only on real errors and DWARF_CB_ABORT if exiting early
(but not in error). Handle all errors from frame callback in print_frames
after printing of good frames. Print as much information as possible like
tid, address and module name if known with error messages. Only exit with
exit code zero if everything went fine. Exit with error code one if there
were any non-fatal errors. Exit with error code two if no frames could be
printed or a fatal error occurred.
Signed-off-by: Mark Wielaard <mjw@redhat.com>
2 files changed