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/*
* UNG's Not GNU
*
* Copyright (c) 2011-2019, Jakob Kaivo <jkk@ung.org>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#define _XOPEN_SOURCE 500
#include <errno.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/resource.h>
#include <unistd.h>
static int renice(int increment, int which, const char *id)
{
id_t who = atoi(id);
errno = 0;
int current = getpriority(which, who);
if (current == -1 && errno != 0) {
fprintf(stderr, "renice: %s: %s\n", id, strerror(errno));
return 1;
}
if (setpriority(which, who, current - increment) != 0) {
fprintf(stderr, "renice: %s: %s\n", id, strerror(errno));
return 1;
}
return 0;
}
int main(int argc, char *argv[])
{
setlocale(LC_ALL, "");
int which = PRIO_PROCESS;
char *increment = NULL;
int c;
while ((c = getopt(argc, argv, "gn:pu")) != -1) {
switch (c) {
case 'p':
which = PRIO_PROCESS;
break;
case 'u':
which = PRIO_PGRP;
break;
case 'g':
which = PRIO_USER;
break;
case 'n':
increment = optarg;
break;
default:
return 1;
}
}
if (increment == NULL) {
fprintf(stderr, "renice: missing -n option\n");
return 1;
}
int inc = atoi(increment);
if (optind >= argc) {
fprintf(stderr, "renice: missing operands\n");
return 1;
}
int r = 0;
do {
r |= renice(inc, which, argv[optind++]);
} while (optind < argc);
return r;
}
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