Support `rr release` command

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#3,879 1 comment 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty
5/5
Estimated time
Over a week
Newbie friendliness
30/100
Issue type
Feature
Clarity
Needs clarification
Activity status
Stale
Tech stack
cpp, linux
Domain
devtools, operating-systems

Research direction

Compare the proposed rr release <cmd> [args...] wrapper with the release-on-exec configuration for rr record, including the shown RUNNING_UNDER_RR and --nested=release behavior. Choose and specify one approach, then verify that a forked-and-execed subprocess is released without changing other process behavior.

Written by the indexing model from the issue text.

Description

Motivation: sometimes it is desirable to make rr not track a subprocess spawned by fork+exec.

(see linux - Support in rr-debugger for not recording a subprocess? - Stack Overflow )

I think there could be two ways

  • define rr release <cmd> [args...] command that does something equivalent to the following

     if [[ "$RUNNING_UNDER_RR" == 1 ]]; then
 	rr record --nested=release env --unset=RUNNING_UNDER_RR "$@"
 else
 	"$@"
 fi

  • make a release-on-exec configuration that can be passed to rr record that releases a process on fork+exec. (ideally without affecting other things such as create new thread, fork without exec i.e. process spawn worker process, etc.)

The second would be more convenient, but the first would be more flexible, assume the user can modify and recompile the process.

Dominant language
C++
Stars
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Forks
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Avg merge
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Merged PRs (30d)
2

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