posix/src/sched_getprioritymin.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  *  @file
0005  *
0006  *  @brief Get the Minimum Priority Limit
0007  *  @ingroup POSIXAPI
0008  */
0009
0010 /*
0011  *  COPYRIGHT (c) 1989-2007.
0012  *  On-Line Applications Research Corporation (OAR).
0013  *
0014  * Redistribution and use in source and binary forms, with or without
0015  * modification, are permitted provided that the following conditions
0016  * are met:
0017  * 1. Redistributions of source code must retain the above copyright
0018  *    notice, this list of conditions and the following disclaimer.
0019  * 2. Redistributions in binary form must reproduce the above copyright
0020  *    notice, this list of conditions and the following disclaimer in the
0021  *    documentation and/or other materials provided with the distribution.
0022  *
0023  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0024  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0025  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0026  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0027  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0028  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0029  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0030  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0031  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0032  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0033  * POSSIBILITY OF SUCH DAMAGE.
0034  */
0035
0036 #ifdef HAVE_CONFIG_H
0037 #include "config.h"
0038 #endif
0039
0040 #include <sched.h>
0041 #include <errno.h>
0042
0043 #include <rtems/seterr.h>
0044 #include <rtems/posix/priorityimpl.h>
0045
0046 /**
0047  *  13.3.6 Get Scheduling Parameter Limits, P1003.1b-1993, p. 258
0048  */
0049 int sched_get_priority_min(
0050   int  policy
0051 )
0052 {
0053   switch ( policy ) {
0054     case SCHED_OTHER:
0055     case SCHED_FIFO:
0056     case SCHED_RR:
0057     case SCHED_SPORADIC:
0058       break;
0059
0060     default:
0061       rtems_set_errno_and_return_minus_one( EINVAL );
0062   }
0063
0064   return POSIX_SCHEDULER_MINIMUM_PRIORITY;
0065 }