nuttx/sched/pthread/pthread_get_stacksize_np.c

/****************************************************************************
 * sched/pthread/pthread_get_stacksize_np.c
 *
 *   Copyright (C) 2018 Geoff Norton. All rights reserved.
 *   Author: Geoff Norton <grompf@gmail.com>
 *
 * 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,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

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

#include <nuttx/config.h>

#include <sys/types.h>
#include <pthread.h>
#include <errno.h>

#include "pthread/pthread.h"

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

/****************************************************************************
 * Name: pthread_get_stacksize_np
 *
 * Description:
 *   Get a pointer to the base of the pthread stack
 *
 * Parameters:
 *   pthread_t - The pthread being queried
 *
 * Returned Value:
 *   A positive, non-zerp pthread stack address is returned on success.  A
 *   negative value is returned in the case that the 'thread' argument does
 *   not refer to a valid thread.
 *
 ****************************************************************************/

ssize_t pthread_get_stacksize_np(pthread_t thread)
{
  FAR struct pthread_tcb_s *tcb =
    (FAR struct pthread_tcb_s *)sched_gettcb((pid_t)thread);

  if (tcb == NULL)
    {
      return -EINVAL;
    }

  return tcb->cmn.adj_stack_size;
}