Use the double fork method to daemonize jailer #4259
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## main #4259 +/- ##
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- Coverage 81.72% 81.66% -0.07%
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Files 240 240
Lines 29266 29288 +22
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Use the double fork method to daemonize jailer as suggested in https://0xjet.github.io/3OHA/2022/04/11/post.html 1st fork to make sure setsid doesn't fail and 2nd fork is to make sure the daemon code cannot reacquire a controlling terminal. Signed-off-by: Sudan Landge <sudanl@amazon.com>
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This was referenced Feb 9, 2024
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Changes
1st fork to make sure setsid doesn't fail and 2nd fork is to
make sure the daemon code cannot reacquire a controlling terminal.
In addition to the CI tried running --daemonize manually as per steps mentioned in #4140 and didn't see the setsid error.
Reason
to start if it was started a process group leader, because setsid()
returns an error if the calling process is already a process group
leader.
This was a common reported issue by users running jailer manually.
Compared to maintaining a document which was rather difficult to
understand and explain, it is easier to handle this case in jailer by not
calling setsid when process id is same as process groud id (i.e. when
jailer is not the process group leader).
License Acceptance
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CONTRIBUTING.md.PR Checklist
[ ] If a specific issue led to this PR, this PR closes the issue.[ ] API changes follow the Runbook for Firecracker API changes.[ ] User-facing changes are mentioned inCHANGELOG.md.[ ] NewTODOs link to an issue.rust-vmm.