/usr/share/systemtap/tapset/linux/guru-signal.stp is in systemtap-common 2.3-1ubuntu1.
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 | // Copyright (C) 2013 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.
//
// <tapsetdescription>
// Functions in the guru-signal tapset allow a probe handler to queue
// a user-space signals. Such operations may only be safe from some
// kinds of probe points, therefore are guru-mode only.
// </tapsetdescription>
/**
* sfunction raise - raise a signal in the current thread
* @signo: signal number
*
* Description: This function calls the kernel send_sig routine on
* the current thread, with the given raw unchecked signal number.
* It may raise an error if send_sig() failed.
* It requires guru mode.
*/
function raise(signo:long) %{
/* guru */
int rc = send_sig ((int) STAP_ARG_signo, current, 1);
if (rc) {
snprintf (CONTEXT->error_buffer, sizeof(CONTEXT->error_buffer),
"raise/send_sig error %d", rc);
CONTEXT->last_error = CONTEXT->error_buffer;
}
%}
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