BSD 4_2 release

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

#ifndef lint
static  char *sccsid = "@(#)renice.c    4.6 (Berkeley) 83/07/24";
#endif

#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);
}