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Differential D58327

procdesc: report NOTE_PDSIGCHLD for traced/stopped process
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Authored by kib on Jul 18 2026, 5:35 PM.
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kevans
markj
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rGb328975b9d7c: procdesc: report NOTE_PDSIGCHLD for traced and stopped process
Summary
on attach of the knote.  It is same as for NOTE_EXIT when attaching to
the exiting process.

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rG FreeBSD src repository
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kib created this revision.Jul 18 2026, 5:35 PM
Herald added subscribers: olce, imp. · View Herald TranscriptJul 18 2026, 5:35 PM
kib requested review of this revision.Jul 18 2026, 5:35 PM
markj added inline comments.Jul 19 2026, 6:13 PM
sys/kern/sys_procdesc.c
504

The code is just checking whether the proc is stopped, it might not be traced.

510
kib marked 2 inline comments as done.Jul 19 2026, 6:42 PM
kib added inline comments.
sys/kern/sys_procdesc.c
504

P_STOPPED_TRACE means that the process is traced (and stopped in ptracestop()).
Checking P_STOPPED_TRACE might be redundant, but I think it is more correct to check.

markj added inline comments.Jul 19 2026, 6:45 PM
sys/kern/sys_procdesc.c
504

I mean, we will generate an event if just P_STOPPED_SIG is set. In that case, the process might not be traced.

kib updated this revision to Diff 182242.Jul 19 2026, 6:45 PM
kib marked an inline comment as done.

Use atomic to load p_flag.

kib marked an inline comment as done.Jul 19 2026, 6:52 PM
kib added inline comments.
sys/kern/sys_procdesc.c
504

I added 'stopped or traced'.

kib updated this revision to Diff 182249.Jul 19 2026, 6:52 PM
kib marked an inline comment as done.

Update comment.

markj accepted this revision.Jul 20 2026, 12:45 AM
markj added inline comments.
sys/kern/sys_procdesc.c
504
This revision is now accepted and ready to land.Jul 20 2026, 12:45 AM
kib marked an inline comment as done.Jul 20 2026, 1:59 AM
Closed by commit rGb328975b9d7c: procdesc: report NOTE_PDSIGCHLD for traced and stopped process (authored by kib). · Explain WhyJul 20 2026, 2:01 AM
This revision was automatically updated to reflect the committed changes.
kib added a commit: rGb328975b9d7c: procdesc: report NOTE_PDSIGCHLD for traced and stopped process.

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sys/
kern/
15 lines

Diff 182269

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sys/kern/sys_procdesc.c

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