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Filename : guru-signal.stp
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// 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;
  }
%}