1 | /* Copyright (C) 1996,97,98,99,2000,2002,2004 Free Software Foundation, Inc. |
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2 | This file is part of the GNU C Library. |
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3 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. |
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4 | |
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5 | The GNU C Library is free software; you can redistribute it and/or |
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6 | modify it under the terms of the GNU Lesser General Public |
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7 | License as published by the Free Software Foundation; either |
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8 | version 2.1 of the License, or (at your option) any later version. |
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9 | |
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10 | The GNU C Library is distributed in the hope that it will be useful, |
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11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 | Lesser General Public License for more details. |
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14 | |
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15 | You should have received a copy of the GNU Lesser General Public |
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16 | License along with the GNU C Library; if not, write to the Free |
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17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
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18 | 02111-1307 USA. */ |
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19 | |
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20 | #include <errno.h> |
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21 | #define _IO_MTSAFE_IO |
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22 | #include <bits/libc-lock.h> |
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23 | |
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24 | #include "nsswitch.h" |
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25 | |
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26 | /*******************************************************************\ |
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27 | |* Here we assume several symbols to be defined: *| |
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28 | |* *| |
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29 | |* LOOKUP_TYPE - the return type of the function *| |
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30 | |* *| |
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31 | |* SETFUNC_NAME - name of the non-reentrant setXXXent function *| |
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32 | |* *| |
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33 | |* GETFUNC_NAME - name of the non-reentrant getXXXent function *| |
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34 | |* *| |
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35 | |* ENDFUNC_NAME - name of the non-reentrant endXXXent function *| |
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36 | |* *| |
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37 | |* DATABASE_NAME - name of the database the function accesses *| |
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38 | |* (e.g., host, services, ...) *| |
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39 | |* *| |
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40 | |* Optionally the following vars can be defined: *| |
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41 | |* *| |
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42 | |* STAYOPEN - variable declaration for setXXXent function *| |
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43 | |* *| |
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44 | |* STAYOPEN_VAR - variable name for setXXXent function *| |
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45 | |* *| |
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46 | |* NEED_H_ERRNO - an extra parameter will be passed to point to *| |
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47 | |* the global `h_errno' variable. *| |
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48 | |* *| |
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49 | \*******************************************************************/ |
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50 | |
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51 | /* To make the real sources a bit prettier. */ |
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52 | #define REENTRANT_GETNAME APPEND_R (GETFUNC_NAME) |
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53 | #define APPEND_R(Name) CONCAT2_2 (Name, _r) |
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54 | #define INTERNAL(Name) CONCAT2_2 (__, Name) |
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55 | #define CONCAT2_1(Pre, Post) CONCAT2_2 (Pre, Post) |
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56 | #define CONCAT2_2(Pre, Post) Pre##Post |
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57 | #define NEW(name) NEW1 (name) |
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58 | #define NEW1(name) __new_##name |
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59 | |
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60 | #define SETFUNC_NAME_STRING STRINGIZE (SETFUNC_NAME) |
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61 | #define GETFUNC_NAME_STRING STRINGIZE (REENTRANT_GETNAME) |
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62 | #define ENDFUNC_NAME_STRING STRINGIZE (ENDFUNC_NAME) |
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63 | #define DATABASE_NAME_STRING STRINGIZE (DATABASE_NAME) |
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64 | #define STRINGIZE(Name) STRINGIZE1 (Name) |
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65 | #define STRINGIZE1(Name) #Name |
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66 | |
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67 | #ifndef DB_LOOKUP_FCT |
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68 | # define DB_LOOKUP_FCT CONCAT3_1 (__nss_, DATABASE_NAME, _lookup) |
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69 | # define CONCAT3_1(Pre, Name, Post) CONCAT3_2 (Pre, Name, Post) |
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70 | # define CONCAT3_2(Pre, Name, Post) Pre##Name##Post |
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71 | #endif |
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72 | |
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73 | /* Sometimes we need to store error codes in the `h_errno' variable. */ |
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74 | #ifdef NEED_H_ERRNO |
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75 | # define H_ERRNO_PARM , int *h_errnop |
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76 | # define H_ERRNO_VAR , &h_errno |
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77 | # define H_ERRNO_VAR_P &h_errno |
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78 | #else |
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79 | # define H_ERRNO_PARM |
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80 | # define H_ERRNO_VAR |
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81 | # define H_ERRNO_VAR_P NULL |
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82 | #endif |
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83 | |
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84 | /* Some databases take the `stayopen' flag. */ |
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85 | #ifdef STAYOPEN |
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86 | # define STAYOPEN_TMP CONCAT2_1 (STAYOPEN, _tmp) |
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87 | # define STAYOPEN_TMPVAR &CONCAT2_1 (STAYOPEN_VAR, _tmp) |
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88 | #else |
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89 | # define STAYOPEN void |
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90 | # define STAYOPEN_VAR 0 |
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91 | # define STAYOPEN_TMPVAR NULL |
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92 | #endif |
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93 | |
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94 | #ifndef NEED__RES |
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95 | # define NEED__RES 0 |
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96 | #endif |
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97 | |
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98 | /* This handle for the NSS data base is shared between all |
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99 | set/get/endXXXent functions. */ |
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100 | static service_user *nip; |
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101 | /* Remember the last service used since the last call to `endXXent'. */ |
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102 | static service_user *last_nip; |
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103 | /* Remember the first service_entry, it's always the same. */ |
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104 | static service_user *startp; |
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105 | |
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106 | #ifdef STAYOPEN_TMP |
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107 | /* We need to remember the last `stayopen' flag given by the user |
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108 | since the `setent' function is only called for the first available |
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109 | service. */ |
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110 | static STAYOPEN_TMP; |
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111 | #endif |
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112 | |
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113 | /* Protect above variable against multiple uses at the same time. */ |
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114 | __libc_lock_define_initialized (static, lock) |
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115 | |
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116 | /* The lookup function for the first entry of this service. */ |
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117 | extern int DB_LOOKUP_FCT (service_user **nip, const char *name, void **fctp) |
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118 | internal_function; |
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119 | libc_hidden_proto (DB_LOOKUP_FCT) |
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120 | |
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121 | void |
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122 | SETFUNC_NAME (STAYOPEN) |
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123 | { |
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124 | int save; |
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125 | |
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126 | __libc_lock_lock (lock); |
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127 | __nss_setent (SETFUNC_NAME_STRING, DB_LOOKUP_FCT, &nip, &startp, |
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128 | &last_nip, STAYOPEN_VAR, STAYOPEN_TMPVAR, NEED__RES); |
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129 | |
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130 | save = errno; |
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131 | __libc_lock_unlock (lock); |
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132 | __set_errno (save); |
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133 | } |
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134 | |
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135 | |
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136 | void |
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137 | ENDFUNC_NAME (void) |
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138 | { |
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139 | int save; |
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140 | |
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141 | /* If the service has not been used before do not do anything. */ |
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142 | if (startp != NULL) |
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143 | { |
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144 | __libc_lock_lock (lock); |
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145 | __nss_endent (ENDFUNC_NAME_STRING, DB_LOOKUP_FCT, &nip, &startp, |
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146 | &last_nip, NEED__RES); |
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147 | save = errno; |
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148 | __libc_lock_unlock (lock); |
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149 | __set_errno (save); |
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150 | } |
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151 | } |
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152 | |
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153 | |
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154 | int |
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155 | INTERNAL (REENTRANT_GETNAME) (LOOKUP_TYPE *resbuf, char *buffer, size_t buflen, |
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156 | LOOKUP_TYPE **result H_ERRNO_PARM) |
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157 | { |
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158 | int status; |
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159 | int save; |
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160 | |
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161 | __libc_lock_lock (lock); |
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162 | status = __nss_getent_r (GETFUNC_NAME_STRING, SETFUNC_NAME_STRING, |
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163 | DB_LOOKUP_FCT, &nip, &startp, &last_nip, |
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164 | STAYOPEN_TMPVAR, NEED__RES, resbuf, buffer, |
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165 | buflen, (void **) result, H_ERRNO_VAR_P); |
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166 | save = errno; |
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167 | __libc_lock_unlock (lock); |
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168 | __set_errno (save); |
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169 | return status; |
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170 | } |
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171 | |
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172 | |
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173 | #include <shlib-compat.h> |
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174 | #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1_2) |
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175 | #define OLD(name) OLD1 (name) |
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176 | #define OLD1(name) __old_##name |
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177 | |
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178 | int |
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179 | attribute_compat_text_section |
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180 | OLD (REENTRANT_GETNAME) (LOOKUP_TYPE *resbuf, char *buffer, size_t buflen, |
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181 | LOOKUP_TYPE **result H_ERRNO_PARM) |
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182 | { |
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183 | int ret = INTERNAL (REENTRANT_GETNAME) (resbuf, buffer, buflen, |
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184 | result H_ERRNO_VAR); |
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185 | |
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186 | if (ret != 0) |
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187 | ret = -1; |
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188 | |
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189 | return ret; |
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190 | } |
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191 | |
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192 | #define do_symbol_version(real, name, version) \ |
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193 | compat_symbol (libc, real, name, version) |
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194 | do_symbol_version (OLD (REENTRANT_GETNAME), REENTRANT_GETNAME, GLIBC_2_0); |
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195 | #endif |
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196 | |
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197 | /* As INTERNAL (REENTRANT_GETNAME) may be hidden, we need an alias |
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198 | in between so that the REENTRANT_GETNAME@@GLIBC_2.1.2 is not |
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199 | hidden too. */ |
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200 | strong_alias (INTERNAL (REENTRANT_GETNAME), NEW (REENTRANT_GETNAME)); |
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201 | |
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202 | #define do_default_symbol_version(real, name, version) \ |
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203 | versioned_symbol (libc, real, name, version) |
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204 | do_default_symbol_version (NEW (REENTRANT_GETNAME), |
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205 | REENTRANT_GETNAME, GLIBC_2_1_2); |
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206 | |
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207 | static_link_warning (SETFUNC_NAME) |
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208 | static_link_warning (ENDFUNC_NAME) |
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209 | static_link_warning (REENTRANT_GETNAME) |
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