/* SPDX-License-Identifier: BSD-2-Clause */

/**
 * @file
 *
 * @ingroup POSIXAPI
 *
 * @brief Limits for Scheduling Parameter
 */

/*
 *  13.3.6 Get Scheduling Parameter Limits, P1003.1b-1993, p. 258
 *
 *  COPYRIGHT (c) 1989-2007.
 *  On-Line Applications Research Corporation (OAR).
 *
 * 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.
 *
 * 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
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 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <unistd.h> /* getpid */
#include <sched.h>
#include <errno.h>

#include <rtems/score/timespec.h>
#include <rtems/config.h>
#include <rtems/seterr.h>

int sched_rr_get_interval(
  pid_t             pid,
  struct timespec  *interval
)
{
  /*
   *  Only supported for the "calling process" (i.e. this node).
   */

  if ( pid && pid != getpid() )
    rtems_set_errno_and_return_minus_one( ESRCH );

  if ( !interval )
    rtems_set_errno_and_return_minus_one( EINVAL );

  _Timespec_From_ticks(
    rtems_configuration_get_ticks_per_timeslice(),
    interval
  );

  return 0;
}