busybox

/* vi: set sw=4 ts=4: */

/*

 * nice implementation for busybox

 *

 * Copyright (C) 2005  Manuel Novoa III  <mjn3@codepoet.org>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

 * General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

 *

 */

​

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <limits.h>

#include <errno.h>

#include <unistd.h>

#include <sys/time.h>

#include <sys/resource.h>

#include "busybox.h"

​

static inline int int_add_no_wrap(int a, int b)

{

    int s = a + b;

​

    if (b < 0) {

        if (s > a) s = INT_MIN;

    } else {

        if (s < a) s = INT_MAX;

    }

​

    return s;

}

​

int nice_main(int argc, char **argv)

{

    static const char Xetpriority_msg[] = "cannot %cet priority";

​

    int old_priority, adjustment;

​

    errno = 0;           /* Needed for getpriority error detection. */

    old_priority = getpriority(PRIO_PROCESS, 0);

    if (errno) {

        bb_perror_msg_and_die(Xetpriority_msg, 'g');

    }

​

    if (!*++argv) { /* No args, so (GNU) output current nice value. */

        bb_printf("%d\n", old_priority);

        bb_fflush_stdout_and_exit(EXIT_SUCCESS);

    }

​

    adjustment = 10;            /* Set default adjustment. */