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/*
* Copyright (c) 2008, The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google, Inc. 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 COPYRIGHT HOLDERS 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
* COPYRIGHT OWNER 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.
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sched.h>
static void
usage(const char *s)
{
fprintf(stderr, "USAGE: %s [[-r] priority pids ...] [-g pid]\n", s);
exit(EXIT_FAILURE);
}
void print_prio(pid_t pid)
{
int sched;
struct sched_param sp;
printf("pid %d's priority: %d\n", pid, getpriority(PRIO_PROCESS, pid));
printf("scheduling class: ");
sched = sched_getscheduler(pid);
switch (sched) {
case SCHED_FIFO:
printf("FIFO\n");
break;
case SCHED_RR:
printf("RR\n");
break;
case SCHED_OTHER:
printf("Normal\n");
break;
case -1:
perror("sched_getscheduler");
break;
default:
printf("Unknown\n");
}
sched_getparam(pid, &sp);
printf("RT prio: %d (of %d to %d)\n", sp.sched_priority,
sched_get_priority_min(sched), sched_get_priority_max(sched));
}
int renice_main(int argc, char *argv[])
{
int prio;
int realtime = 0;
char *cmd = argv[0];
// consume command name
argc--;
argv++;
if (argc < 1)
usage(cmd);
if(strcmp("-r", argv[0]) == 0) {
// do realtime priority adjustment
realtime = 1;
argc--;
argv++;
}
if(strcmp("-g", argv[0]) == 0) {
if (argc < 2)
usage(cmd);
print_prio(atoi(argv[1]));
return 0;
}
if (argc < 1)
usage(cmd);
prio = atoi(argv[0]);
argc--;
argv++;
if (argc < 1)
usage(cmd);
while(argc) {
pid_t pid;
pid = atoi(argv[0]);
argc--;
argv++;
if (realtime) {
struct sched_param sp = { .sched_priority = prio };
int ret;
ret = sched_setscheduler(pid, SCHED_RR, &sp);
if (ret) {
perror("sched_set_scheduler");
exit(EXIT_FAILURE);
}
} else {
int ret;
ret = setpriority(PRIO_PROCESS, pid, prio);
if (ret) {
perror("setpriority");
exit(EXIT_FAILURE);
}
}
}
return 0;
}