[Bug tapsets/20618] New: Cannot get the real syscall return code value

["mysecondaccountabc at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20618

            Bug ID: 20618
           Summary: Cannot get the real syscall return code value
           Product: systemtap
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: tapsets
          Assignee: systemtap at sourceware dot org
          Reporter: mysecondaccountabc at gmail dot com
  Target Milestone: ---

We need to get the syscall return value and the errno separately. However, when
for instance, the connect syscall is executed in a non-blocking socket and it
returns -1 and errno=115 (EINPROGRESS) all we get in a "probe syscall.*.return"
is:
  returnval() = -115
  retstr = "-115 (EINPROGRESS)"

We couldn't find in any part of the documentation that returnval() or the
syscall return value will be replaced with the errno value, so I wonder if it's
a bug or in any case, how can we get/recover the original syscall return code?

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