/usr/share/systemtap/tapset/logging.stp is in systemtap-common 2.6-0.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Copyright (C) 2005-2011 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.
/**
* sfunction log - Send a line to the common trace buffer
*
* @msg: The formatted message string
*
* Description: This function logs data. log sends the
* message immediately to staprun and to the bulk transport
* (relayfs) if it is being used. If the last character given
* is not a newline, then one is added. This function is not
* as efficient as printf and should be used only for urgent
* messages.
*/
function log (msg:string) %{ /* unprivileged */
_stp_printf ("%s\n", STAP_ARG_msg);
%}
/**
* sfunction warn - Send a line to the warning stream
*
* @msg: The formatted message string
*
* Description: This function sends a warning message immediately to
* staprun. It is also sent over the bulk transport (relayfs) if it is
* being used. If the last characater is not a newline, the one is added.
*/
function warn (msg:string) %{ /* unprivileged */
_stp_warn ("%s", STAP_ARG_msg);
%}
/**
* sfunction exit - Start shutting down probing script.
*
* Description: This only enqueues a request to start
* shutting down the script. New probes will not fire
* (except "end" probes), but all currently
* running ones may complete their work.
*/
function exit () %{ /* unprivileged */
atomic_set (session_state(), STAP_SESSION_STOPPING);
_stp_exit ();
%}
/**
* sfunction error - Send an error message
*
* @msg: The formatted message string
*
* Description: An implicit end-of-line is added. staprun prepends
* the string "ERROR:". Sending an error message aborts the currently
* running probe. Depending on the MAXERRORS parameter, it may
* trigger an exit().
*/
function error (msg:string) %{ /* unprivileged */
/* 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 = STAP_ARG_msg;
CONTEXT->last_stmt = NULL;
%}
function stp_print_binary(n:long, arg1:long, arg2:long, arg3:long, arg4:long) %{
_stp_print_binary (STAP_ARG_n, STAP_ARG_arg1, STAP_ARG_arg2, STAP_ARG_arg3, STAP_ARG_arg4);
%}
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