144 lines
3.7 KiB
C
144 lines
3.7 KiB
C
/*
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* Copyright (c) 2008, The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google, Inc. nor the names of its contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sched.h>
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static void
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usage(const char *s)
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{
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fprintf(stderr, "USAGE: %s [[-r] priority pids ...] [-g pid]\n", s);
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exit(EXIT_FAILURE);
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}
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void print_prio(pid_t pid)
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{
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int sched;
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struct sched_param sp;
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printf("pid %d's priority: %d\n", pid, getpriority(PRIO_PROCESS, pid));
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printf("scheduling class: ");
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sched = sched_getscheduler(pid);
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switch (sched) {
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case SCHED_FIFO:
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printf("FIFO\n");
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break;
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case SCHED_RR:
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printf("RR\n");
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break;
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case SCHED_OTHER:
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printf("Normal\n");
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break;
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case -1:
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perror("sched_getscheduler");
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break;
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default:
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printf("Unknown\n");
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}
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sched_getparam(pid, &sp);
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printf("RT prio: %d (of %d to %d)\n", sp.sched_priority,
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sched_get_priority_min(sched), sched_get_priority_max(sched));
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}
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int renice_main(int argc, char *argv[])
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{
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int prio;
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int realtime = 0;
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char *cmd = argv[0];
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// consume command name
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argc--;
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argv++;
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if (argc < 1)
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usage(cmd);
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if(strcmp("-r", argv[0]) == 0) {
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// do realtime priority adjustment
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realtime = 1;
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argc--;
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argv++;
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}
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if(strcmp("-g", argv[0]) == 0) {
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if (argc < 2)
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usage(cmd);
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print_prio(atoi(argv[1]));
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return 0;
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}
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if (argc < 1)
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usage(cmd);
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prio = atoi(argv[0]);
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argc--;
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argv++;
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if (argc < 1)
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usage(cmd);
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while(argc) {
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pid_t pid;
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pid = atoi(argv[0]);
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argc--;
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argv++;
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if (realtime) {
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struct sched_param sp = { .sched_priority = prio };
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int ret;
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ret = sched_setscheduler(pid, SCHED_RR, &sp);
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if (ret) {
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perror("sched_set_scheduler");
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exit(EXIT_FAILURE);
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}
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} else {
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int ret;
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ret = setpriority(PRIO_PROCESS, pid, prio);
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if (ret) {
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perror("setpriority");
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exit(EXIT_FAILURE);
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}
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}
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}
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return 0;
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}
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