1 | #include <machine/rtems-bsd-user-space.h> |
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2 | |
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3 | /*- |
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4 | * Copyright (c) 2008 Yahoo!, Inc. |
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5 | * All rights reserved. |
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6 | * Written by: John Baldwin <jhb@FreeBSD.org> |
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7 | * |
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8 | * Redistribution and use in source and binary forms, with or without |
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9 | * modification, are permitted provided that the following conditions |
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10 | * are met: |
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11 | * 1. Redistributions of source code must retain the above copyright |
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12 | * notice, this list of conditions and the following disclaimer. |
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13 | * 2. Redistributions in binary form must reproduce the above copyright |
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14 | * notice, this list of conditions and the following disclaimer in the |
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15 | * documentation and/or other materials provided with the distribution. |
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16 | * 3. Neither the name of the author nor the names of any co-contributors |
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17 | * may be used to endorse or promote products derived from this software |
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18 | * without specific prior written permission. |
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19 | * |
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20 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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21 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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26 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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28 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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29 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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30 | * SUCH DAMAGE. |
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31 | */ |
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32 | |
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33 | #include <sys/cdefs.h> |
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34 | __FBSDID("$FreeBSD$"); |
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35 | |
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36 | #include <rtems/bsd/sys/types.h> |
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37 | #include <sys/sysctl.h> |
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38 | #include <stdio.h> |
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39 | #include <stdlib.h> |
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40 | |
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41 | /* |
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42 | * Returns true if the named feature is present in the currently |
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43 | * running kernel. A feature's presence is indicated by an integer |
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44 | * sysctl node called kern.feature.<feature> that is non-zero. |
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45 | */ |
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46 | int |
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47 | feature_present(const char *feature) |
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48 | { |
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49 | char *mib; |
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50 | size_t len; |
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51 | int i; |
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52 | |
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53 | if (asprintf(&mib, "kern.features.%s", feature) < 0) |
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54 | return (0); |
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55 | len = sizeof(i); |
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56 | if (sysctlbyname(mib, &i, &len, NULL, 0) < 0) { |
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57 | free(mib); |
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58 | return (0); |
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59 | } |
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60 | free(mib); |
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61 | if (len != sizeof(i)) |
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62 | return (0); |
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63 | return (i != 0); |
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64 | } |
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