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scoutos / prex-0.9.0 / usr / lib / posix / process / setpriority.c @ 03e9c04a

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/*
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 * Copyright (c) 2007, Kohsuke Ohtani
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. Neither the name of the author nor the names of any co-contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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#include <sys/prex.h>
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#include <sys/posix.h>
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#include <ipc/proc.h>
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#include <sys/resource.h>
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#include <stddef.h>
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#include <unistd.h>
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#include <errno.h>
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/*
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 * setpriority - set priority for process or process group.
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 *
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 * Note: support only for current process.
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 */
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int
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setpriority(int which, int who, int pri)
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{
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        int error, val;
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        switch (which) {
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        case PRIO_PROCESS:
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        case PRIO_PGRP:
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                if (who != 0) {
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                        errno = EPERM;
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                        return -1;
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                }
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                break;
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        case PRIO_USER:
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                if (who != 1) {
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                        errno = EPERM;
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                        return -1;
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                }
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                break;
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        default:
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                errno = EINVAL;
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                return -1;
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        }
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        if (pri < MINPRI)
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                pri = MINPRI;
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        if (pri > MAXPRI)
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                pri = MAXPRI;
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        val = PRI_DEFAULT + pri;
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        error = thread_setpri(thread_self(), val);
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        if (error) {
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                errno = error;
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                return -1;
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        }
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        return 0;
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}