108 lines
3.1 KiB
C
108 lines
3.1 KiB
C
/*
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* Copyright (c) 1989, 1993, 1994
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* The Regents of the University of California. 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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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT 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 <sys/types.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <ctype.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#define DEFNICE 10
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void usage(void);
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int
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main(int argc, char *argv[])
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{
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long niceness = DEFNICE;
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int ch;
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char *ep;
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char arg1[10];
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/* Obsolescent syntax: -number, --number */
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if (argc >= 2 && argv[1][0] == '-' && (argv[1][1] == '-' ||
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isdigit((unsigned char)argv[1][1])) && strcmp(argv[1], "--") != 0) {
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snprintf(arg1, sizeof(arg1), "-n%s", argv[1] + 1);
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argv[1] = arg1;
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}
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while ((ch = getopt(argc, argv, "n:")) != -1) {
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switch (ch) {
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case 'n':
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errno = 0;
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niceness = strtol(optarg, &ep, 10);
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if (ep == optarg || *ep != '\0' || errno ||
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niceness < INT_MIN || niceness > INT_MAX) {
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fprintf(stderr, "%s: invalid nice value", optarg);
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return 1;
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}
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break;
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (argc == 0)
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usage();
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errno = 0;
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niceness += getpriority(PRIO_PROCESS, 0);
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if (errno) {
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perror("getpriority");
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return 1;
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}
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if (setpriority(PRIO_PROCESS, 0, (int)niceness)) {
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perror("setpriority");
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return 1;
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}
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errno = 0;
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execvp(*argv, argv);
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perror("execvp");
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return 1;
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}
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void
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usage(void)
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{
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(void)fprintf(stderr, "usage: nice [-n incr] utility [arguments]\n");
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exit(1);
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}
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