`info proc` doesn't work on replays
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Description
info proc mappings works fine, but the other parts of info proc, also requested in #1834, does not.
I've just rechecked: using "plain gdbserver + gdb" this works fine, a way to have this working in rr would be:
- include in trace and symlink similar to the proc mappings
- /proc/$pid/cmdline
- /proc/$pid/cwd
- /proc/$pid/exe
- otherwise interrupt the calls from GDB requesting those (the remote GDB shows those from the inferior, so has to ask gdbserver for that)
If for some reason those cannot be intercepted, then a new command rr-info proc could show them.
Originally posted by @GitMensch in https://github.com/rr-debugger/rr/issues/2032#issuecomment-879091625
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Research direction
Start at the existing handling for /proc/$pid/maps and the info proc entry point, then compare how GDB requests the other proc values during replay. Done means info proc can report mappings, cmdline, cwd, and exe for replays, or a documented rr-info proc alternative is provided.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp, linux
- Domain
- devtools, operating-systems
- Issue type
- Feature
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 30/100