89 lines
1.8 KiB
C
89 lines
1.8 KiB
C
#ifndef lint
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static char *sccsid = "@(#)renice.c 1.1 92/07/30 SMI"; /* from UCB 4.6 83/07/24 */
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#endif
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <stdio.h>
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#include <pwd.h>
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/*
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* Change the priority (nice) of processes
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* or groups of processes which are already
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* running.
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*/
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main(argc, argv)
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char **argv;
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{
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int which = PRIO_PROCESS;
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int who = 0, prio, errs = 0;
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argc--, argv++;
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if (argc < 2) {
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fprintf(stderr, "usage: renice priority [ [ -p ] pids ] ");
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fprintf(stderr, "[ [ -g ] pgrps ] [ [ -u ] users ]\n");
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exit(1);
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}
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prio = atoi(*argv);
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argc--, argv++;
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if (prio > PRIO_MAX)
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prio = PRIO_MAX;
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if (prio < PRIO_MIN)
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prio = PRIO_MIN;
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for (; argc > 0; argc--, argv++) {
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if (strcmp(*argv, "-g") == 0) {
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which = PRIO_PGRP;
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continue;
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}
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if (strcmp(*argv, "-u") == 0) {
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which = PRIO_USER;
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continue;
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}
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if (strcmp(*argv, "-p") == 0) {
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which = PRIO_PROCESS;
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continue;
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}
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if (which == PRIO_USER) {
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register struct passwd *pwd = getpwnam(*argv);
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if (pwd == NULL) {
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fprintf(stderr, "renice: %s: unknown user\n",
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*argv);
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continue;
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}
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who = pwd->pw_uid;
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} else {
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who = atoi(*argv);
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if (who < 0) {
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fprintf(stderr, "renice: %s: bad value\n",
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*argv);
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continue;
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}
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}
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errs += donice(which, who, prio);
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}
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exit(errs != 0);
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/* NOTREACHED */
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}
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donice(which, who, prio)
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int which, who, prio;
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{
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int oldprio;
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extern int errno;
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errno = 0, oldprio = getpriority(which, who);
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if (oldprio == -1 && errno) {
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fprintf(stderr, "renice: %d: ", who);
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perror("getpriority");
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return (1);
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}
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if (setpriority(which, who, prio) < 0) {
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fprintf(stderr, "renice: %d: ", who);
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perror("setpriority");
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return (1);
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}
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printf("%d: old priority %d, new priority %d\n", who, oldprio, prio);
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return (0);
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}
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