93 lines
2.8 KiB
C
93 lines
2.8 KiB
C
/****************************************************************************
|
|
* libs/libc/unistd/lib_getpriority.c
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
#include <sys/resource.h>
|
|
|
|
#include <sched.h>
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
|
|
#include <nuttx/sched.h>
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: getpriority
|
|
*
|
|
* Description:
|
|
* The getpriority() function shall obtain the nice value of a process,
|
|
* process group, or user.
|
|
*
|
|
* Input Parameters:
|
|
* which - PRIO_PROCESS, PRIO_PGRP, or PRIO_USER, ignored in current
|
|
* implementation.
|
|
* who - Process id is interpreted relative to "which"
|
|
*
|
|
* Returned Value:
|
|
* Upon successful completion, getpriority() shall return an integer in
|
|
* the range -{NZERO} to {NZERO}-1. Otherwise, -1 shall be returned and
|
|
* errno set to indicate the error. The following errors may be
|
|
* reported:
|
|
*
|
|
* - ESRCH: No process was located using the which and who values
|
|
* specified.
|
|
* - EINVAL: which was not one of PRIO_PROCESS, PRIO_PGRP, or
|
|
* PRIO_USER.
|
|
*
|
|
* Assumptions:
|
|
*
|
|
****************************************************************************/
|
|
|
|
int getpriority(int which, id_t who)
|
|
{
|
|
struct sched_param param;
|
|
int ret;
|
|
|
|
if (which > PRIO_USER || which < PRIO_PROCESS)
|
|
{
|
|
set_errno(EINVAL);
|
|
return ERROR;
|
|
}
|
|
|
|
if (who == 0)
|
|
{
|
|
who = _SCHED_GETTID();
|
|
}
|
|
|
|
ret = sched_getparam(who, ¶m);
|
|
if (ret < 0)
|
|
{
|
|
return ret;
|
|
}
|
|
|
|
/* Since -1 is a legal return value, clear errno to avoid the chaos */
|
|
|
|
set_errno(0);
|
|
|
|
return NZERO - param.sched_priority;
|
|
}
|