tapset/logging.stp


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// logging tapset
// Copyright (C) 2005, 2006 Red Hat Inc.
//
// This file is part of systemtap, and is free software.  You can
// redistribute it and/or modify it under the terms of the GNU General
// Public License (GPL); either version 2, or (at your option) any
// later version.

function print (msg:string) %{
    _stp_print (THIS->msg);
%}

// like print but with a newline
function log (msg:string) %{
    _stp_printf ("%s\n", THIS->msg);
%}

function warn (msg:string) %{
    _stp_warn ("%s", THIS->msg);
%}

// NB: exit() does *not* cause immediate return from current function/probe
function exit () %{
    atomic_set (&session_state, STAP_SESSION_STOPPING);
    _stp_exit ();
%}

function error (msg:string) %{
    /* This is an assignment of a local char[] to a global char*.
       It would normally be just as unsafe as returning a pointer to
       a local variable from a function.  However, the translated
       code ensures that upon an error (last_error != NULL), the
       context stack is only ever unwound, and not reused, before
       the probe-level stp-error call.  */
    CONTEXT->last_error = THIS->msg;
    CONTEXT->last_stmt = NULL;
%}