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Annotation of prex-old/usr/lib/posix/process/getpriority.c, Revision 1.1

1.1     ! nbrk        1: /*
        !             2:  * Copyright (c) 2007, Kohsuke Ohtani
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. Neither the name of the author nor the names of any co-contributors
        !            14:  *    may be used to endorse or promote products derived from this software
        !            15:  *    without specific prior written permission.
        !            16:  *
        !            17:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
        !            18:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            19:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            20:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
        !            21:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            22:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            23:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            24:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            25:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            26:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            27:  * SUCH DAMAGE.
        !            28:  */
        !            29:
        !            30: #include <prex/prex.h>
        !            31: #include <prex/posix.h>
        !            32: #include <server/proc.h>
        !            33: #include <sys/resource.h>
        !            34:
        !            35: #include <stddef.h>
        !            36: #include <unistd.h>
        !            37: #include <errno.h>
        !            38:
        !            39: int
        !            40: getpriority(int which, int who)
        !            41: {
        !            42:        int prio;
        !            43:
        !            44:        switch (which) {
        !            45:        case PRIO_PROCESS:
        !            46:        case PRIO_PGRP:
        !            47:                if (who != 0) {
        !            48:                        errno = EPERM;
        !            49:                        return -1;
        !            50:                }
        !            51:                break;
        !            52:        case PRIO_USER:
        !            53:                if (who != 1) {
        !            54:                        errno = EPERM;
        !            55:                        return -1;
        !            56:                }
        !            57:                break;
        !            58:        default:
        !            59:                errno = EINVAL;
        !            60:                return -1;
        !            61:        }
        !            62:        thread_getprio(thread_self(), &prio);
        !            63:
        !            64:        prio -= CONFIG_USER_PRIO;
        !            65:
        !            66:        if (prio < PRIO_MIN)
        !            67:                prio = PRIO_MIN;
        !            68:        if (prio > PRIO_MAX)
        !            69:                prio = PRIO_MAX;
        !            70:
        !            71:        return prio;
        !            72: }