priority.c

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/*
priority.c
*/

#include <errno.h>
#include <sys/types.h>
#include <sys/resource.h>
#include <lib.h>
#include <unistd.h>
#include <string.h>
#include <stddef.h>


int getpriority(int which, int who)
{
        int v;
        message m;

        m.m1_i1 = which;
        m.m1_i2 = who;

        /* GETPRIORITY returns negative for error.
         * Otherwise, it returns the priority plus the minimum
         * priority, to distiginuish from error. We have to
         * correct for this. (The user program has to check errno
         * to see if something really went wrong.)
         */

        if((v = _syscall(MM, GETPRIORITY, &m)) < 0) {
                return v;
        }

        return v + PRIO_MIN;
}

int setpriority(int which, int who, int prio)
{
        message m;

        m.m1_i1 = which;
        m.m1_i2 = who;
        m.m1_i3 = prio;

        return _syscall(MM, SETPRIORITY, &m);
}

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