Display DSO if symbol is unknown

[Xyene]

Closes #173.

Signed-off-by: Tudor Brindus tbrindus@janestreet.com

[cgaebel]

Could you please add a test with real dsos in it? Feel free to just regenerate one of the hello-world tests.

Also maybe worth trying a dso with spaces or close parens in the path, at least to demonstrate the edges of where things break down.

[shoffmeister]

FWIW, I cherry-picked the one real applicable commit on top of the current master (git fetch git@github.com:Xyene/magic-trace.git track-dso && git cherry-pick 2578e7157256f399dd7cb07a6aaf7ae23e2668fd) and get

from doing an attach (as root) on a /usr/libexec/Xorg process (which is a Linux X11 server process).

From what I can tell, the module path / name resolution is correct (also the implicit vdso).

I'd be happy to see this in an official build.

[cgaebel]

LGTM, thanks!