[Bug tapsets/12471] Support wait4 *status printing

[jan.kratochvil at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12471

--- Comment #4 from Jan Kratochvil <jan.kratochvil at redhat dot com> 2011-02-09 18:13:52 UTC ---
(In reply to comment #3)
> probe syscall.wait4.return = kernel.function("sys_wait4").return
> {
>   name = "wait4"
>   status_str = ($stat_addr == 0) ? "NULL"
>      : _wait_status_str(user_int($stat_addr))
>   retstr = return_str(1, $return)
> }

OK, I can do it this way for now.


My longer plan were more adjustments for getting closer to the output of
strace, for strace reimplementation on top of systemtap, as discussed before:
http://jankratochvil.net/priv/staptrace-0.1.tar.xz 

strace prints the returned wait string already as part of the parameters.
wait4(-1, [{WIFSTOPPED(s) && WSTOPSIG(s) == SIGTRAP}], WNOHANG, NULL) = 8580

That may be resolved later, though.

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