NetBSD/usr.bin/nice/nice.c

124 lines
3.4 KiB
C

/* $NetBSD: nice.c,v 1.15 2008/07/21 14:19:24 lukem Exp $ */
/*
* Copyright (c) 1989 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name of the University 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 REGENTS 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 REGENTS 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 <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1989\
The Regents of the University of California. All rights reserved.");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)nice.c 5.4 (Berkeley) 6/1/90";
#endif
__RCSID("$NetBSD: nice.c,v 1.15 2008/07/21 14:19:24 lukem Exp $");
#endif /* not lint */
#include <sys/time.h>
#include <sys/resource.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <locale.h>
#include <ctype.h>
#include <errno.h>
#include <err.h>
#include <unistd.h>
#define DEFNICE 10
static void usage(void) __dead;
int
main(int argc, char **argv)
{
char *ep;
int niceness = DEFNICE;
int c;
long tmp;
setprogname(argv[0]);
(void)setlocale(LC_ALL, "");
/* handle obsolete -number syntax */
if (argc > 1 && argv[1][0] == '-' &&
isdigit((unsigned char)argv[1][1])) {
niceness = atoi (argv[1] + 1);
argc--; argv++;
}
while ((c = getopt (argc, argv, "n:")) != -1) {
switch (c) {
case 'n':
errno = 0;
tmp = strtol(optarg, &ep, 10);
if (*ep != '\0' || tmp < INT_MIN || tmp > INT_MAX)
errx(EXIT_FAILURE, "invalid argument: `%s'",
optarg);
niceness = (int)tmp;
break;
default:
usage();
break;
}
}
argc -= optind;
argv += optind;
if (argc == 0)
usage();
errno = 0;
niceness += getpriority(PRIO_PROCESS, 0);
if (errno) {
err(EXIT_FAILURE, "getpriority");
/* NOTREACHED */
}
if (setpriority(PRIO_PROCESS, 0, niceness) == -1) {
warn("setpriority");
}
(void)execvp(argv[0], &argv[0]);
err((errno == ENOENT || errno == ENOTDIR) ? 127 : 126, "%s", argv[0]);
/* NOTREACHED */
}
static void
usage(void)
{
(void)fprintf(stderr,
"Usage: %s [ -n increment ] utility [ argument ...]\n",
getprogname());
exit(EXIT_FAILURE);
}