[Bug runtime/13537] New: standardize error code handling

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

http://sourceware.org/bugzilla/show_bug.cgi?id=13537

             Bug #: 13537
           Summary: standardize error code handling
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
        AssignedTo: systemtap@sourceware.org
        ReportedBy: fche@redhat.com
    Classification: Unclassified


staprun and friends have a lot of functions that return 0 for ok
and -1 (and sometimes a few other codes) for errors.  This loses errno
values, and doesn't let callers discriminate between problems properly.
These should be standardized to return 0 for ok and -errno, basically
as per the kernel.

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