Differential D7045

Add PTRACE_VFORK to trace vfork events.
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Authored by jhb on Jul 1 2016, 1:47 AM.

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rS303001: Add PTRACE_VFORK to trace vfork events.

Summary

Add PTRACE_VFORK to trace vfork events.

First, PL_FLAG_FORKED events now also set a PL_FLAG_VFORKED flag when
the new child was created via vfork() rather than fork(). Second, a
new PL_FLAG_VFORK_DONE event can now be enabled via the PTRACE_VFORK
event mask. This new stop is reported after the vfork parent resumes
due to the child calling exit or exec. Debuggers can use this stop to
reinsert breakpoints in the vfork parent process before it resumes.

Test Plan

Run new tests.

Diff Detail

Repository

rS FreeBSD src repository - subversion

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jhb updated this revision to Diff 18052.Jul 1 2016, 1:47 AM

jhb retitled this revision from to Add PTRACE_VFORK to trace vfork events..

jhb updated this object.

jhb edited the test plan for this revision. (Show Details)

jhb added a reviewer: kib.

Herald added subscribers: emaste, imp. · View Herald TranscriptJul 1 2016, 1:47 AM

Rebase after ptrace events were committed upstream.
Add PTRACE_VFORK to the list of valid event flags.
Document PTRACE_VFORK.

Herald added a reviewer: manpages. · View Herald TranscriptJul 16 2016, 5:07 PM

The changes to let gdb use this (along with some other fixes) are here:

https://github.com/bsdjhb/gdb/compare/vfork_done2

I will post those patches to gdb-patches@ once PTRACE_VFORK lands in HEAD.

kib accepted this revision.Jul 16 2016, 11:44 PM

kib edited edge metadata.

This revision is now accepted and ready to land.Jul 16 2016, 11:44 PM

Closed by commit rS303001: Add PTRACE_VFORK to trace vfork events. (authored by jhb). · Explain WhyJul 18 2016, 2:54 PM

This revision was automatically updated to reflect the committed changes.

Revision Contents
Changeset List

Path

Size

head/

lib/

libc/

sys/

44 lines

sys/

kern/

1 line

8 lines

8 lines

sys/

1 line

3 lines

tests/

sys/

kern/

126 lines

Diff 18509

head/lib/libc/sys/ptrace.2

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head/sys/kern/kern_fork.c

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head/sys/kern/subr_syscall.c

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head/sys/kern/sys_process.c

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head/sys/sys/proc.h

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head/sys/sys/ptrace.h

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head/tests/sys/kern/ptrace_test.c

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