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root/usr/bin/nice/nice.c

DEFINITIONS

1. main
2. usage

   1 /*
   2  * Copyright (c) 1989 The Regents of the University of California.
   3  * 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  */
  30 #include <sys/types.h>
  31 #include <sys/time.h>
  32 #include <sys/resource.h>
  34 #include <ctype.h>
  35 #include <errno.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <unistd.h>
  39 #include <string.h>
  40 #include <err.h>
  42 #ifdef CMDBOX
  43 #define main(argc, argv)        nice_main(argc, argv)
  44 #endif
  46 #define DEFNICE 10
  48 static void usage(void);
  50 int
main(int argc, char *argv[])
  52 {
  53         int niceness = DEFNICE;
  54         int c;
  56         /* handle obsolete -number syntax */
  57         if (argc > 1 && argv[1][0] == '-' &&
isdigit((unsigned char)argv[1][1])) {
niceness = atoi (argv[1] + 1);
argc--; argv++;
  61         }
  63         while ((c = getopt (argc, argv, "n:")) != -1) {
  64                 switch (c) {
  65                 case 'n':
niceness = atoi (optarg);
  67                         break;
  69                 case '?':
  70                 default:
usage();
  72                         break;
  73                 }
  74         }
argc -= optind; argv += optind;
  77         if (argc == 0)
usage();
errno = 0;
niceness += getpriority(PRIO_PROCESS, 0);
  82         if (errno) {
err (1, "getpriority");
  84                 /* NOTREACHED */
  85         }
  86         if (setpriority(PRIO_PROCESS, 0, niceness) == -1) {
warn ("setpriority");
  88         }
execvp(argv[0], &argv[1]);
err ((errno == ENOENT) ? 127 : 126, "%s", argv[0]);
  91         /* NOTREACHED */
  92         return 0;
  93 }
  95 static void
usage()
  97 {
  98         (void)fprintf(stderr,
  99             "usage: nice [ -n increment ] utility [ argument ...]\n");
exit(1);
 101 }