/usr/share/systemtap/tapset/linux/logging.stp is in systemtap-common 2.9-2ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | // logging tapset
// 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 ftrace - Send a message to the ftrace ring-buffer
*
* @msg: The formatted message string
*
* Description: If the ftrace ring-buffer is configured & available,
* see /debugfs/tracing/trace for the message. Otherwise, the
* message may be quietly dropped. An implicit end-of-line is added.
*/
function ftrace (msg:string) %{ /* unmodified-fnargs */
#ifdef STAPCONF_TRACE_PRINTK
static char *fmt = "%s\n";
trace_printk (fmt, STAP_ARG_msg);
/* The "fmt" is designed to be non __builtin_constant_p(), so as
to defeat trace_printk -> __trace_bprintk optimization. That's
because bprintk doesn't save the incoming strings, only their
addresses. */
#endif
%}
/**
* sfunction printk - Send a message to the kernel trace buffer
*
* @level: an integer for the severity level (0=KERN_EMERG ... 7=KERN_DEBUG)
* @msg: The formatted message string
*
* Description: Print a line of text to the kernel dmesg/console with the
* given severity. An implicit end-of-line is added. This function may
* not be safely called from all kernel probe contexts, so is restricted
* to guru mode only.
*/
function printk (level:long,msg:string) %{ /* guru */ /* unmodified-fnargs */
printk (STAP_ARG_level == 0 ? KERN_EMERG "%s\n":
STAP_ARG_level == 1 ? KERN_ALERT "%s\n":
STAP_ARG_level == 2 ? KERN_CRIT "%s\n":
STAP_ARG_level == 3 ? KERN_ERR "%s\n":
STAP_ARG_level == 4 ? KERN_WARNING "%s\n":
STAP_ARG_level == 5 ? KERN_NOTICE "%s\n":
STAP_ARG_level == 6 ? KERN_INFO "%s\n":
STAP_ARG_level == 7 ? KERN_DEBUG "%s\n":
#ifdef KERN_DEFAULT
KERN_DEFAULT "%s\n"
#else
KERN_INFO "%s\n"
#endif
, STAP_ARG_msg);
%}
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