1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * nice implementation for busybox
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4 | *
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5 | * Copyright (C) 2005 Manuel Novoa III <mjn3@codepoet.org>
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6 | *
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7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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8 | */
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9 |
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10 | //usage:#define nice_trivial_usage
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11 | //usage: "[-n ADJUST] [PROG ARGS]"
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12 | //usage:#define nice_full_usage "\n\n"
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13 | //usage: "Change scheduling priority, run PROG\n"
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14 | //usage: "\n -n ADJUST Adjust priority by ADJUST"
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15 |
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16 | #include <sys/resource.h>
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17 | #include "libbb.h"
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18 |
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19 | int nice_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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20 | int nice_main(int argc, char **argv)
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21 | {
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22 | int old_priority, adjustment;
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23 |
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24 | old_priority = getpriority(PRIO_PROCESS, 0);
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25 |
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26 | if (!*++argv) { /* No args, so (GNU) output current nice value. */
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27 | printf("%d\n", old_priority);
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28 | fflush_stdout_and_exit(EXIT_SUCCESS);
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29 | }
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30 |
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31 | adjustment = 10; /* Set default adjustment. */
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32 |
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33 | if (argv[0][0] == '-') {
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34 | if (argv[0][1] == 'n') { /* -n */
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35 | if (argv[0][2]) { /* -nNNNN (w/o space) */
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36 | argv[0] += 2; argv--; argc++;
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37 | }
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38 | } else { /* -NNN (NNN may be negative) == -n NNN */
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39 | argv[0] += 1; argv--; argc++;
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40 | }
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41 | if (argc < 4) { /* Missing priority and/or utility! */
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42 | bb_show_usage();
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43 | }
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44 | adjustment = xatoi_range(argv[1], INT_MIN/2, INT_MAX/2);
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45 | argv += 2;
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46 | }
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47 |
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48 | { /* Set our priority. */
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49 | int prio = old_priority + adjustment;
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50 |
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51 | if (setpriority(PRIO_PROCESS, 0, prio) < 0) {
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52 | bb_perror_msg_and_die("setpriority(%d)", prio);
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53 | }
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54 | }
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55 |
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56 | BB_EXECVP_or_die(argv);
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57 | }
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