nuttx/libc/signal/sig_ismember.c

/****************************************************************************
 * libc/signal/sig_ismember.c
 *
 *   Copyright (C) 2007, 2008, 2011 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <signal.h>

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: sigismember
 *
 * Description:
 *   This function tests whether the signal specified by signo is a member
 *   of the set specified by set.
 *
 * Parameters:
 *   set - Signal set to test
 *   signo - Signal to test for
 *
 * Return Value:
 *   1 (true), if the specified signal is a member of the set,
 *   0 (OK or FALSE), if it is not, or
 *  -1 (ERROR) if the signal number is invalid.
 *
 * Assumptions:
 *
 ****************************************************************************/

int sigismember(FAR const sigset_t *set, int signo)
{
  int ret = ERROR;

  /* Verify the signal */

  if (GOOD_SIGNO(signo))
    {
      /* Check if the signal is in the set */

      ret = ((*set & SIGNO2SET(signo)) != 0);
    }

  return ret;
}