scoutos / prex-0.9.0 / usr / bin / nice / nice.c @ 03e9c04a
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/*
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* Copyright (c) 1989 The Regents of the University of California.
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* 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. 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 <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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#include <err.h> |
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#ifdef CMDBOX
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#define main(argc, argv) nice_main(argc, argv)
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#endif
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#define DEFNICE 10 |
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static 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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int niceness = DEFNICE;
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int c;
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/* handle obsolete -number syntax */
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if (argc > 1 && argv[1][0] == '-' && |
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isdigit((unsigned char)argv[1][1])) { |
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niceness = atoi (argv[1] + 1); |
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argc--; argv++; |
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} |
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while ((c = getopt (argc, argv, "n:")) != -1) { |
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switch (c) {
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case 'n': |
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niceness = atoi (optarg); |
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break;
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case '?': |
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default:
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usage(); |
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break;
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} |
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} |
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argc -= optind; 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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err (1, "getpriority"); |
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/* NOTREACHED */
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} |
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if (setpriority(PRIO_PROCESS, 0, niceness) == -1) { |
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warn ("setpriority");
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} |
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execvp(argv[0], &argv[1]); |
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err ((errno == ENOENT) ? 127 : 126, "%s", argv[0]); |
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/* NOTREACHED */
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return 0; |
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} |
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static void |
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usage() |
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{ |
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(void)fprintf(stderr,
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"usage: nice [ -n increment ] utility [ argument ...]\n");
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exit(1);
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} |