Subprocess: Use pidfd (PIDFD_GET_INFO if supported) to monitor an imported process for exit status - #18922

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tomponline wants to merge 15 commits into

canonical:mainfrom

tomponline:tp-subprocess-wait

Commits on Aug 25, 2026

lxd/subprocess: Adds waitProcess function that uses pidfd to detect when a process exits
tomponline
committed
4a177a1
lxd/subprocess: Make ImportProcess spawn a monitor that uses pidfd for monitoring the process' exit status
tomponline
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1cd12af
lxd/subprocess/proc: Update Save to avoid races
tomponline
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06fd3e9
lxd/subprocess: Update tests to use Save command in savePidFile
tomponline
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e9f6fb1
lxd/subprocess: Add TestImportWaitExitCode test
tomponline
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38d1017

Commits on Aug 26, 2026

lxd/subprocess: Extend TestImportRoundTripLive test with Stop check
tomponline
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909b526
TestImportWaitExitCode WIP
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b4c4236
monitorImported
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a338d48
lxd/subprocess/procwait
tomponline
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9ef89cb
lxd/subprocess: Adds ErrAlreadyRunning error
tomponline
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d57da1a
lxd/subprocess: Clear hasMonitor in finish
tomponline
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a68207a
lxd/subprocess: Release process if running check fails in ImportProcess
tomponline
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6949e40
lxd/subprocess: Dont allow start of a running process
tomponline
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c8c85fa
lxd/subprocess: ImportProcess ordering
tomponline
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3d92ab3
lxd/subprocess/procwait_linux: Fix import
tomponline
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bd97b76