Implement PTRACE_O_TRACESYSGOOD

[trasz]

Summary

Implement PTRACE_O_TRACESYSGOOD. This makes Linux strace(1) work.

[dchagin]

sys/amd64/linux/linux_ptrace.c

115

used from MI code, and in my understandig can be MI too,
after you finish we can reuse it and implement the rest

323

btw, in the Linuxulator we have linux_msg() :)
again, up to you

sys/compat/linux/linux_emul.h

35

I prefer to include imgact.h in the linux_ptrace.c, again, up to you

sys/compat/linux/linux_misc.c

927

it will break i386, arm64 Linuxulators

sys/compat/linux/linux_misc.h

152–154

only for amd64?

[trasz]

sys/amd64/linux/linux_ptrace.c

115

Could be, but it depends on kern_ptrace(), and a Linux-specific ptrace flag.

How about leaving it here, and just wrapping the call (below) with #ifdef amd64?

323

Good point; I'll change all the printfs here to linux_msg() in a future commit.

sys/compat/linux/linux_emul.h

35

Thing is, we don't need the entire imgact.h there - it's just a compilation fix.

sys/compat/linux/linux_misc.h

152–154

Yeah. I don't see much point in working on 32 bit ptrace; I'm not even sure if CentOS folks still distribute 32 bit strace(1) binary.

[trasz]

Ifdef out the thing.

[dchagin]

sys/compat/linux/linux_misc.h

152–154

I mean one more #ifdef amd64 )

[trasz]

One more ifdef, per dchagin's suggestion.

[trasz]

Okay, there's still something wrong. While "kldload linux64" works, the "kldload linux" doesn't due to "link_elf_obj: symbol linux_ptrace_status undefined" error.

[trasz]

Even more better ifdefs.

[dchagin]

:)
as I already say, moving linux_ptrace_status() to MI (linux_util.c or linux.c) solves you problem with ifdefs )

[emaste]

more betterer is good