119 lines
2.0 KiB
C
119 lines
2.0 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <sys/resource.h>
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#include <errno.h>
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#include <limits.h>
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#include <pwd.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "util.h"
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static int strtop(const char *);
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static bool renice(int, int, long);
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static void eusage(void);
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int
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main(int argc, char **argv)
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{
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const char *adj = NULL;
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long val;
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int i, which = PRIO_PROCESS, status = EXIT_SUCCESS;
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ARGBEGIN {
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case 'n':
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adj = EARGF(eusage());
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break;
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case 'g':
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which = PRIO_PGRP;
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break;
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case 'p':
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which = PRIO_PROCESS;
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break;
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case 'u':
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which = PRIO_USER;
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break;
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default:
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eusage();
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break;
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} ARGEND;
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if(argc == 0 || !adj)
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eusage();
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val = estrtol(adj, 10);
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for(i = 0; i < argc; i++) {
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int who = -1;
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if(which == PRIO_USER) {
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const struct passwd *pwd;
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errno = 0;
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do pwd = getpwnam(argv[i]); while(errno == EINTR);
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if(pwd)
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who = pwd->pw_uid;
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else if(errno != 0) {
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perror("can't read passwd");
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status = EXIT_FAILURE;
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continue;
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}
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}
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if(who < 0)
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who = strtop(argv[i]);
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if(who < 0 || !renice(which, who, val))
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status = EXIT_FAILURE;
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}
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return status;
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}
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static int
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strtop(const char *s)
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{
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char *end;
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long n;
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errno = 0;
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n = strtol(s, &end, 10);
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if(*end != '\0') {
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fprintf(stderr, "%s: not an integer\n", s);
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return -1;
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}
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if(errno != 0 || n <= 0 || n > INT_MAX) {
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fprintf(stderr, "%s: invalid value\n", s);
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return -1;
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}
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return (int)n;
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}
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static bool
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renice(int which, int who, long adj)
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{
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errno = 0;
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adj += getpriority(which, who);
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if(errno != 0) {
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fprintf(stderr, "can't get %d nice level: %s\n",
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who, strerror(errno));
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return false;
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}
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/* PRIO_{MIN,MAX} does not exist in musl libc */
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adj = MAX(-20, MIN(adj, 20));
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if(setpriority(which, who, (int)adj) == -1) {
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fprintf(stderr, "can't set %d nice level: %s\n",
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who, strerror(errno));
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return false;
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}
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return true;
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}
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static void
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eusage(void)
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{
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eprintf("renice -n inc [-g | -p | -u] ID ...\n");
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}
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