root / prex-0.9.0 / usr / bin / nice / nice.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*
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2 | * Copyright (c) 1989 The Regents of the University of California.
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the University nor the names of its contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | #include <sys/types.h> |
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31 | #include <sys/time.h> |
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32 | #include <sys/resource.h> |
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33 | |||
34 | #include <ctype.h> |
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35 | #include <errno.h> |
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36 | #include <stdio.h> |
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37 | #include <stdlib.h> |
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38 | #include <unistd.h> |
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39 | #include <string.h> |
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40 | #include <err.h> |
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41 | |||
42 | #ifdef CMDBOX
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43 | #define main(argc, argv) nice_main(argc, argv)
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44 | #endif
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45 | |||
46 | #define DEFNICE 10 |
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47 | |||
48 | static void usage(void); |
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49 | |||
50 | int
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51 | main(int argc, char *argv[]) |
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52 | { |
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53 | int niceness = DEFNICE;
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54 | int c;
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55 | |||
56 | /* handle obsolete -number syntax */
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57 | if (argc > 1 && argv[1][0] == '-' && |
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58 | isdigit((unsigned char)argv[1][1])) { |
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59 | niceness = atoi (argv[1] + 1); |
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60 | argc--; argv++; |
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61 | } |
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62 | |||
63 | while ((c = getopt (argc, argv, "n:")) != -1) { |
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64 | switch (c) {
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65 | case 'n': |
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66 | niceness = atoi (optarg); |
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67 | break;
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68 | |||
69 | case '?': |
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70 | default:
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71 | usage(); |
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72 | break;
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73 | } |
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74 | } |
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75 | argc -= optind; argv += optind; |
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76 | |||
77 | if (argc == 0) |
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78 | usage(); |
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79 | |||
80 | errno = 0;
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81 | niceness += getpriority(PRIO_PROCESS, 0);
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82 | if (errno) {
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83 | err (1, "getpriority"); |
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84 | /* NOTREACHED */
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85 | } |
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86 | if (setpriority(PRIO_PROCESS, 0, niceness) == -1) { |
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87 | warn ("setpriority");
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88 | } |
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89 | execvp(argv[0], &argv[1]); |
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90 | err ((errno == ENOENT) ? 127 : 126, "%s", argv[0]); |
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91 | /* NOTREACHED */
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92 | return 0; |
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93 | } |
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94 | |||
95 | static void |
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96 | usage() |
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97 | { |
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98 | (void)fprintf(stderr,
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99 | "usage: nice [ -n increment ] utility [ argument ...]\n");
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100 | exit(1);
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101 | } |