[Bug tapsets/20363] New: syscall return probes should provide a richer retstr

["jistone at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20363

            Bug ID: 20363
           Summary: syscall return probes should provide a richer retstr
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: tapsets
          Assignee: systemtap at sourceware dot org
          Reporter: jistone at redhat dot com
  Target Milestone: ---

The result of most system calls is just a simple return value, and our
tapset-provided retstr=return_str(...) is sufficient.

Some system calls have additional data to return, and it would be nice to have
a uniform way to show this too.  A sys_read will have written some data in the
buffer, a sys_ptrace may have extra data depending on the sort of PTRACE_FOO
request, etc.  And these only apply when the primary return value was not an
error.

It would be nice if this were added to ALL syscalls, even if they have nothing
extra to show, so one could write something like:

  probe syscall.*.return { printf("%s = %s\n", name, detailed_retstr) }

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