BSD 4_3_Net_2 release

[unix-history] / usr / src / usr.bin / renice / renice.c

/*
* Copyright (c) 1983 The Regents of the University of California.
* 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. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by the University of
*      California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*/

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1989 The Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)renice.c    5.3 (Berkeley) 6/1/90";
#endif /* not lint */

#include <sys/time.h>
#include <sys/resource.h>
#include <stdio.h>
#include <pwd.h>

/*
* Change the priority (nice) of processes
* or groups of processes which are already
* running.
*/
main(argc, argv)
       char **argv;
{
       int which = PRIO_PROCESS;
       int who = 0, prio, errs = 0;

       argc--, argv++;
       if (argc < 2) {
               fprintf(stderr, "usage: renice priority [ [ -p ] pids ] ");
               fprintf(stderr, "[ [ -g ] pgrps ] [ [ -u ] users ]\n");
               exit(1);
       }
       prio = atoi(*argv);
       argc--, argv++;
       if (prio > PRIO_MAX)
               prio = PRIO_MAX;
       if (prio < PRIO_MIN)
               prio = PRIO_MIN;
       for (; argc > 0; argc--, argv++) {
               if (strcmp(*argv, "-g") == 0) {
                       which = PRIO_PGRP;
                       continue;
               }
               if (strcmp(*argv, "-u") == 0) {
                       which = PRIO_USER;
                       continue;
               }
               if (strcmp(*argv, "-p") == 0) {
                       which = PRIO_PROCESS;
                       continue;
               }
               if (which == PRIO_USER) {
                       register struct passwd *pwd = getpwnam(*argv);
                       
                       if (pwd == NULL) {
                               fprintf(stderr, "renice: %s: unknown user\n",
                                       *argv);
                               continue;
                       }
                       who = pwd->pw_uid;
               } else {
                       who = atoi(*argv);
                       if (who < 0) {
                               fprintf(stderr, "renice: %s: bad value\n",
                                       *argv);
                               continue;
                       }
               }
               errs += donice(which, who, prio);
       }
       exit(errs != 0);
}

donice(which, who, prio)
       int which, who, prio;
{
       int oldprio;
       extern int errno;

       errno = 0, oldprio = getpriority(which, who);
       if (oldprio == -1 && errno) {
               fprintf(stderr, "renice: %d: ", who);
               perror("getpriority");
               return (1);
       }
       if (setpriority(which, who, prio) < 0) {
               fprintf(stderr, "renice: %d: ", who);
               perror("setpriority");
               return (1);
       }
       printf("%d: old priority %d, new priority %d\n", who, oldprio, prio);
       return (0);
}