[Bug translator/10690] New: need way to produce bigger procfs output

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

There exist uses for procfs("file").write and especially .read,
for which it is desirable for stap scripts to produce much more than
MAXSTRINGLEN bytes of output.

The probe point syntax could be extended to specify a .maxsize(NNN)
option for the probes.  Then, extra syntax of some sort would be
needed to write/read the $value variable.  Perhaps something like
this for the output side:

probe procfs("file").read.maxbuf(8192) {
  $value .= sprint("hello\n")
  $value .= sprint("more and more test\n")
}

(i.e., we'd have to special-case/optimize the concatenate-assign operator.)

I don't have a simple idea about new syntax to parse extra-long incoming
$value strings.  Maybe a special substr that takes string-references instead
of values.?

-- 
           Summary: need way to produce bigger procfs output
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: fche at redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=10690

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