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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1989, 1993, 1994 The Regents of the University of California.  All rights reserved.
  34  * @(#)nice.c   8.2 (Berkeley) 4/16/94
  35  * $FreeBSD: src/usr.bin/nice/nice.c,v 1.4.2.1 2002/06/18 08:40:28 tjr Exp $
  36  */
  37
  38 #include <sys/time.h>
  39 #include <sys/resource.h>
  40
  41 #include <ctype.h>
  42 #include <err.h>
  43 #include <errno.h>
  44 #include <limits.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48 #include <unistd.h>
  49
  50 #define DEFPRIO 4
  51
  52 static void     usage(void);
  53
  54 int
  55 main(int argc, char **argv)
  56 {
  57         long ioprio = DEFPRIO;
  58         int ch;
  59         char *ep;
  60
  61         while ((ch = getopt(argc, argv, "n:")) != -1) {
  62                 switch (ch) {
  63                 case 'n':
  64                         errno = 0;
  65                         ioprio = strtol(optarg, &ep, 10);
  66                         if (ep == optarg || *ep != '\0' || errno ||
  67                             ioprio < INT_MIN || ioprio > INT_MAX)
  68                                 errx(1, "%s: invalid ioprio value", optarg);
  69                         break;
  70                 default:
  71                         usage();
  72                 }
  73         }
  74         argc -= optind;
  75         argv += optind;
  76
  77         if (argc == 0)
  78                 usage();
  79
  80         errno = 0;
  81         if (ioprio_set(PRIO_PROCESS, 0, (int)ioprio))
  82                 warn("ioprio_set");
  83         execvp(*argv, argv);
  84         err(errno == ENOENT || errno == ENOTDIR ? 127 : 126, "%s", *argv);
  85 }
  86
  87 static void
  88 usage(void)
  89 {
  90
  91         fprintf(stderr, "usage: ioprio [-n priority] utility [argument ...]\n");
  92         exit(1);
  93 }