[Bug tapsets/12471] Support wait4 *status printing

["jan.kratochvil at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

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

Jan Kratochvil <jan.kratochvil at redhat dot com> changed:

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--- Comment #5 from Jan Kratochvil <jan.kratochvil at redhat dot com> 2011-02-15 19:35:21 UTC ---
Created attachment 5244
  --> http://sourceware.org/bugzilla/attachment.cgi?id=5244
Fix.

(In reply to comment #3)
> Here's what I was suggesting:
> 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, done this way.


> This patch provides the WIFEXITED/WEXITSTATUS data as a string.  My thought
> above was that we could provide functions like this:
> 
> function WTERMSIG:long(status:long) {
>  return (status & 0x7f)
> }

Done this way, the code looks much better now.

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