Colony » Colony Scout » Colony Scout OS

/*

 * Copyright (c) 2007, Kohsuke Ohtani

 * All rights reserved.

 *

 * 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 of the author nor the names of any co-contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.

 */

#include <sys/prex.h>

#include <sys/posix.h>

#include <ipc/proc.h>

#include <sys/resource.h>

#include <stddef.h>

#include <unistd.h>

#include <errno.h>

/*

 * setpriority - set priority for process or process group.

 *

 * Note: support only for current process.

 */

int

setpriority(int which, int who, int pri)

{

        int error, val;

        switch (which) {

        case PRIO_PROCESS:

        case PRIO_PGRP:

                if (who != 0) {

                        errno = EPERM;

                        return -1;

                }

                break;

        case PRIO_USER:

                if (who != 1) {

                        errno = EPERM;

                        return -1;

                }

                break;

        default:

                errno = EINVAL;

                return -1;

        }

        if (pri < MINPRI)

                pri = MINPRI;

        if (pri > MAXPRI)

                pri = MAXPRI;

        val = PRI_DEFAULT + pri;

        error = thread_setpri(thread_self(), val);

        if (error) {

                errno = error;

                return -1;

        }

        return 0;

}