usr.bin/ioprio/ioprio.c

   1 /*
   2  * Copyright (c) 1989, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1989, 1993, 1994 The Regents of the University of California.  All rights reserved.
  30  * @(#)nice.c   8.2 (Berkeley) 4/16/94
  31  * $FreeBSD: src/usr.bin/nice/nice.c,v 1.4.2.1 2002/06/18 08:40:28 tjr Exp $
  32  */
  33
  34 #include <sys/time.h>
  35 #include <sys/resource.h>
  36
  37 #include <ctype.h>
  38 #include <err.h>
  39 #include <errno.h>
  40 #include <limits.h>
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <unistd.h>
  45
  46 #define DEFPRIO 4
  47
  48 static void     usage(void);
  49
  50 int
  51 main(int argc, char **argv)
  52 {
  53         long ioprio = DEFPRIO;
  54         int ch;
  55         char *ep;
  56
  57         while ((ch = getopt(argc, argv, "n:")) != -1) {
  58                 switch (ch) {
  59                 case 'n':
  60                         errno = 0;
  61                         ioprio = strtol(optarg, &ep, 10);
  62                         if (ep == optarg || *ep != '\0' || errno ||
  63                             ioprio < INT_MIN || ioprio > INT_MAX)
  64                                 errx(1, "%s: invalid ioprio value", optarg);
  65                         break;
  66                 default:
  67                         usage();
  68                 }
  69         }
  70         argc -= optind;
  71         argv += optind;
  72
  73         if (argc == 0)
  74                 usage();
  75
  76         errno = 0;
  77         if (ioprio_set(PRIO_PROCESS, 0, (int)ioprio))
  78                 warn("ioprio_set");
  79         execvp(*argv, argv);
  80         err(errno == ENOENT || errno == ENOTDIR ? 127 : 126, "%s", *argv);
  81 }
  82
  83 static void
  84 usage(void)
  85 {
  86
  87         fprintf(stderr, "usage: ioprio [-n priority] utility [argument ...]\n");
  88         exit(1);
  89 }