1 | #include <machine/rtems-bsd-user-space.h> |
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2 | |
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3 | /*- |
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4 | * SPDX-License-Identifier: BSD-2-Clause-FreeBSD |
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5 | * |
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6 | * Copyright (c) 2006 The FreeBSD Project. All rights reserved. |
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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 | * |
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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 | * $FreeBSD$ |
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30 | */ |
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31 | |
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32 | #include <sys/types.h> |
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33 | #include <sys/stat.h> |
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34 | #include <sys/time.h> |
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35 | #include <netinet/in.h> |
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36 | #include <arpa/nameser.h> |
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37 | #include <resolv.h> |
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38 | #include <stdlib.h> |
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39 | |
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40 | #include "namespace.h" |
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41 | #include "reentrant.h" |
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42 | #include "un-namespace.h" |
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43 | |
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44 | #include "res_private.h" |
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45 | |
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46 | #undef _res |
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47 | |
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48 | struct __res_state _res; |
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49 | |
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50 | static thread_key_t res_key; |
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51 | static once_t res_init_once = ONCE_INITIALIZER; |
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52 | static int res_thr_keycreated = 0; |
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53 | |
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54 | static void |
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55 | free_res(void *ptr) |
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56 | { |
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57 | res_state statp = ptr; |
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58 | |
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59 | if (statp->_u._ext.ext != NULL) |
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60 | res_ndestroy(statp); |
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61 | free(statp); |
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62 | } |
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63 | |
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64 | static void |
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65 | res_keycreate(void) |
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66 | { |
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67 | res_thr_keycreated = thr_keycreate(&res_key, free_res) == 0; |
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68 | } |
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69 | |
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70 | static res_state |
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71 | res_check_reload(res_state statp) |
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72 | { |
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73 | struct timespec now; |
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74 | struct stat sb; |
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75 | struct __res_state_ext *ext; |
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76 | |
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77 | if ((statp->options & RES_INIT) == 0) { |
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78 | return (statp); |
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79 | } |
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80 | |
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81 | ext = statp->_u._ext.ext; |
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82 | if (ext == NULL || ext->reload_period == 0) { |
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83 | return (statp); |
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84 | } |
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85 | |
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86 | if (clock_gettime(CLOCK_MONOTONIC_FAST, &now) != 0 || |
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87 | (now.tv_sec - ext->conf_stat) < ext->reload_period) { |
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88 | return (statp); |
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89 | } |
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90 | |
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91 | ext->conf_stat = now.tv_sec; |
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92 | if (stat(_PATH_RESCONF, &sb) == 0 && |
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93 | (sb.st_mtim.tv_sec != ext->conf_mtim.tv_sec || |
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94 | sb.st_mtim.tv_nsec != ext->conf_mtim.tv_nsec)) { |
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95 | statp->options &= ~RES_INIT; |
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96 | } |
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97 | |
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98 | return (statp); |
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99 | } |
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100 | |
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101 | res_state |
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102 | __res_state(void) |
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103 | { |
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104 | res_state statp; |
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105 | |
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106 | #ifndef __rtems__ |
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107 | if (thr_main() != 0) |
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108 | return res_check_reload(&_res); |
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109 | #endif /* __rtems__ */ |
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110 | |
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111 | if (thr_once(&res_init_once, res_keycreate) != 0 || |
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112 | !res_thr_keycreated) |
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113 | return (&_res); |
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114 | |
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115 | statp = thr_getspecific(res_key); |
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116 | if (statp != NULL) |
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117 | return res_check_reload(statp); |
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118 | statp = calloc(1, sizeof(*statp)); |
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119 | if (statp == NULL) |
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120 | return (&_res); |
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121 | #ifdef __BIND_RES_TEXT |
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122 | statp->options = RES_TIMEOUT; /* Motorola, et al. */ |
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123 | #endif |
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124 | if (thr_setspecific(res_key, statp) == 0) |
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125 | return (statp); |
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126 | free(statp); |
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127 | return (&_res); |
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128 | } |
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