scoutos / prex-0.9.0 / usr / lib / posix / process / setpriority.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*
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2 | * Copyright (c) 2007, Kohsuke Ohtani
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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 author nor the names of any co-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 AUTHOR 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 AUTHOR 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/prex.h> |
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31 | #include <sys/posix.h> |
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32 | #include <ipc/proc.h> |
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33 | #include <sys/resource.h> |
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34 | |||
35 | #include <stddef.h> |
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36 | #include <unistd.h> |
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37 | #include <errno.h> |
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38 | |||
39 | /*
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40 | * setpriority - set priority for process or process group.
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41 | *
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42 | * Note: support only for current process.
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43 | */
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44 | int
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45 | setpriority(int which, int who, int pri) |
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46 | { |
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47 | int error, val;
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48 | |||
49 | switch (which) {
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50 | case PRIO_PROCESS:
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51 | case PRIO_PGRP:
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52 | if (who != 0) { |
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53 | errno = EPERM; |
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54 | return -1; |
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55 | } |
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56 | break;
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57 | case PRIO_USER:
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58 | if (who != 1) { |
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59 | errno = EPERM; |
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60 | return -1; |
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61 | } |
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62 | break;
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63 | default:
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64 | errno = EINVAL; |
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65 | return -1; |
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66 | } |
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67 | |||
68 | if (pri < MINPRI)
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69 | pri = MINPRI; |
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70 | if (pri > MAXPRI)
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71 | pri = MAXPRI; |
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72 | |||
73 | val = PRI_DEFAULT + pri; |
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74 | |||
75 | error = thread_setpri(thread_self(), val); |
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76 | if (error) {
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77 | errno = error; |
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78 | return -1; |
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79 | } |
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80 | return 0; |
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81 | } |