[b32552c] | 1 | /* dso.h -*- mode:C; c-file-style: "eay" -*- */ |
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| 2 | /* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL |
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| 3 | * project 2000. |
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| 4 | */ |
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| 5 | /* ==================================================================== |
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| 6 | * Copyright (c) 2000 The OpenSSL 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 | * |
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| 12 | * 1. Redistributions of source code must retain the above copyright |
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| 13 | * notice, this list of conditions and the following disclaimer. |
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| 14 | * |
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| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 16 | * notice, this list of conditions and the following disclaimer in |
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| 17 | * the documentation and/or other materials provided with the |
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| 18 | * distribution. |
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| 19 | * |
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| 20 | * 3. All advertising materials mentioning features or use of this |
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| 21 | * software must display the following acknowledgment: |
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| 22 | * "This product includes software developed by the OpenSSL Project |
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| 23 | * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" |
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| 24 | * |
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| 25 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
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| 26 | * endorse or promote products derived from this software without |
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| 27 | * prior written permission. For written permission, please contact |
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| 28 | * licensing@OpenSSL.org. |
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| 29 | * |
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| 30 | * 5. Products derived from this software may not be called "OpenSSL" |
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| 31 | * nor may "OpenSSL" appear in their names without prior written |
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| 32 | * permission of the OpenSSL Project. |
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| 33 | * |
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| 34 | * 6. Redistributions of any form whatsoever must retain the following |
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| 35 | * acknowledgment: |
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| 36 | * "This product includes software developed by the OpenSSL Project |
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| 37 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" |
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| 38 | * |
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| 39 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
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| 40 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 41 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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| 42 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
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| 43 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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| 44 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 45 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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| 46 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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| 48 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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| 49 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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| 50 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 51 | * ==================================================================== |
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| 52 | * |
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| 53 | * This product includes cryptographic software written by Eric Young |
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| 54 | * (eay@cryptsoft.com). This product includes software written by Tim |
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| 55 | * Hudson (tjh@cryptsoft.com). |
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| 56 | * |
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| 57 | */ |
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| 58 | |
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| 59 | #ifndef HEADER_DSO_H |
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| 60 | #define HEADER_DSO_H |
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| 61 | |
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| 62 | #include <openssl/crypto.h> |
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| 63 | |
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| 64 | #ifdef __cplusplus |
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| 65 | extern "C" { |
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| 66 | #endif |
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| 67 | |
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| 68 | /* These values are used as commands to DSO_ctrl() */ |
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| 69 | #define DSO_CTRL_GET_FLAGS 1 |
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| 70 | #define DSO_CTRL_SET_FLAGS 2 |
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| 71 | #define DSO_CTRL_OR_FLAGS 3 |
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| 72 | |
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| 73 | /* By default, DSO_load() will translate the provided filename into a form |
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| 74 | * typical for the platform (more specifically the DSO_METHOD) using the |
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| 75 | * dso_name_converter function of the method. Eg. win32 will transform "blah" |
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| 76 | * into "blah.dll", and dlfcn will transform it into "libblah.so". The |
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| 77 | * behaviour can be overriden by setting the name_converter callback in the DSO |
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| 78 | * object (using DSO_set_name_converter()). This callback could even utilise |
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| 79 | * the DSO_METHOD's converter too if it only wants to override behaviour for |
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| 80 | * one or two possible DSO methods. However, the following flag can be set in a |
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| 81 | * DSO to prevent *any* native name-translation at all - eg. if the caller has |
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| 82 | * prompted the user for a path to a driver library so the filename should be |
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| 83 | * interpreted as-is. */ |
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| 84 | #define DSO_FLAG_NO_NAME_TRANSLATION 0x01 |
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| 85 | /* An extra flag to give if only the extension should be added as |
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| 86 | * translation. This is obviously only of importance on Unix and |
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| 87 | * other operating systems where the translation also may prefix |
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| 88 | * the name with something, like 'lib', and ignored everywhere else. |
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| 89 | * This flag is also ignored if DSO_FLAG_NO_NAME_TRANSLATION is used |
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| 90 | * at the same time. */ |
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| 91 | #define DSO_FLAG_NAME_TRANSLATION_EXT_ONLY 0x02 |
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| 92 | |
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| 93 | /* The following flag controls the translation of symbol names to upper |
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| 94 | * case. This is currently only being implemented for OpenVMS. |
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| 95 | */ |
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| 96 | #define DSO_FLAG_UPCASE_SYMBOL 0x10 |
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| 97 | |
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| 98 | /* This flag loads the library with public symbols. |
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| 99 | * Meaning: The exported symbols of this library are public |
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| 100 | * to all libraries loaded after this library. |
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| 101 | * At the moment only implemented in unix. |
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| 102 | */ |
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| 103 | #define DSO_FLAG_GLOBAL_SYMBOLS 0x20 |
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| 104 | |
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| 105 | |
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| 106 | typedef void (*DSO_FUNC_TYPE)(void); |
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| 107 | |
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| 108 | typedef struct dso_st DSO; |
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| 109 | |
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| 110 | /* The function prototype used for method functions (or caller-provided |
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| 111 | * callbacks) that transform filenames. They are passed a DSO structure pointer |
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| 112 | * (or NULL if they are to be used independantly of a DSO object) and a |
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| 113 | * filename to transform. They should either return NULL (if there is an error |
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| 114 | * condition) or a newly allocated string containing the transformed form that |
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| 115 | * the caller will need to free with OPENSSL_free() when done. */ |
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| 116 | typedef char* (*DSO_NAME_CONVERTER_FUNC)(DSO *, const char *); |
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| 117 | /* The function prototype used for method functions (or caller-provided |
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| 118 | * callbacks) that merge two file specifications. They are passed a |
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| 119 | * DSO structure pointer (or NULL if they are to be used independantly of |
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| 120 | * a DSO object) and two file specifications to merge. They should |
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| 121 | * either return NULL (if there is an error condition) or a newly allocated |
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| 122 | * string containing the result of merging that the caller will need |
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| 123 | * to free with OPENSSL_free() when done. |
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| 124 | * Here, merging means that bits and pieces are taken from each of the |
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| 125 | * file specifications and added together in whatever fashion that is |
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| 126 | * sensible for the DSO method in question. The only rule that really |
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| 127 | * applies is that if the two specification contain pieces of the same |
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| 128 | * type, the copy from the string string takes priority. One could see |
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| 129 | * it as the first specification is the one given by the user and the |
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| 130 | * second being a bunch of defaults to add on if they're missing in the |
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| 131 | * first. */ |
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| 132 | typedef char* (*DSO_MERGER_FUNC)(DSO *, const char *, const char *); |
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| 133 | |
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| 134 | typedef struct dso_meth_st |
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| 135 | { |
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| 136 | const char *name; |
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| 137 | /* Loads a shared library, NB: new DSO_METHODs must ensure that a |
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| 138 | * successful load populates the loaded_filename field, and likewise a |
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| 139 | * successful unload OPENSSL_frees and NULLs it out. */ |
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| 140 | int (*dso_load)(DSO *dso); |
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| 141 | /* Unloads a shared library */ |
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| 142 | int (*dso_unload)(DSO *dso); |
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| 143 | /* Binds a variable */ |
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| 144 | void *(*dso_bind_var)(DSO *dso, const char *symname); |
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| 145 | /* Binds a function - assumes a return type of DSO_FUNC_TYPE. |
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| 146 | * This should be cast to the real function prototype by the |
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| 147 | * caller. Platforms that don't have compatible representations |
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| 148 | * for different prototypes (this is possible within ANSI C) |
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| 149 | * are highly unlikely to have shared libraries at all, let |
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| 150 | * alone a DSO_METHOD implemented for them. */ |
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| 151 | DSO_FUNC_TYPE (*dso_bind_func)(DSO *dso, const char *symname); |
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| 152 | |
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| 153 | /* I don't think this would actually be used in any circumstances. */ |
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| 154 | #if 0 |
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| 155 | /* Unbinds a variable */ |
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| 156 | int (*dso_unbind_var)(DSO *dso, char *symname, void *symptr); |
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| 157 | /* Unbinds a function */ |
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| 158 | int (*dso_unbind_func)(DSO *dso, char *symname, DSO_FUNC_TYPE symptr); |
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| 159 | #endif |
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| 160 | /* The generic (yuck) "ctrl()" function. NB: Negative return |
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| 161 | * values (rather than zero) indicate errors. */ |
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| 162 | long (*dso_ctrl)(DSO *dso, int cmd, long larg, void *parg); |
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| 163 | /* The default DSO_METHOD-specific function for converting filenames to |
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| 164 | * a canonical native form. */ |
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| 165 | DSO_NAME_CONVERTER_FUNC dso_name_converter; |
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| 166 | /* The default DSO_METHOD-specific function for converting filenames to |
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| 167 | * a canonical native form. */ |
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| 168 | DSO_MERGER_FUNC dso_merger; |
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| 169 | |
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| 170 | /* [De]Initialisation handlers. */ |
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| 171 | int (*init)(DSO *dso); |
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| 172 | int (*finish)(DSO *dso); |
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| 173 | } DSO_METHOD; |
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| 174 | |
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| 175 | /**********************************************************************/ |
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| 176 | /* The low-level handle type used to refer to a loaded shared library */ |
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| 177 | |
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| 178 | struct dso_st |
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| 179 | { |
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| 180 | DSO_METHOD *meth; |
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| 181 | /* Standard dlopen uses a (void *). Win32 uses a HANDLE. VMS |
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| 182 | * doesn't use anything but will need to cache the filename |
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| 183 | * for use in the dso_bind handler. All in all, let each |
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| 184 | * method control its own destiny. "Handles" and such go in |
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| 185 | * a STACK. */ |
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| 186 | STACK *meth_data; |
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| 187 | int references; |
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| 188 | int flags; |
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| 189 | /* For use by applications etc ... use this for your bits'n'pieces, |
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| 190 | * don't touch meth_data! */ |
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| 191 | CRYPTO_EX_DATA ex_data; |
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| 192 | /* If this callback function pointer is set to non-NULL, then it will |
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| 193 | * be used in DSO_load() in place of meth->dso_name_converter. NB: This |
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| 194 | * should normally set using DSO_set_name_converter(). */ |
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| 195 | DSO_NAME_CONVERTER_FUNC name_converter; |
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| 196 | /* If this callback function pointer is set to non-NULL, then it will |
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| 197 | * be used in DSO_load() in place of meth->dso_merger. NB: This |
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| 198 | * should normally set using DSO_set_merger(). */ |
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| 199 | DSO_MERGER_FUNC merger; |
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| 200 | /* This is populated with (a copy of) the platform-independant |
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| 201 | * filename used for this DSO. */ |
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| 202 | char *filename; |
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| 203 | /* This is populated with (a copy of) the translated filename by which |
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| 204 | * the DSO was actually loaded. It is NULL iff the DSO is not currently |
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| 205 | * loaded. NB: This is here because the filename translation process |
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| 206 | * may involve a callback being invoked more than once not only to |
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| 207 | * convert to a platform-specific form, but also to try different |
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| 208 | * filenames in the process of trying to perform a load. As such, this |
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| 209 | * variable can be used to indicate (a) whether this DSO structure |
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| 210 | * corresponds to a loaded library or not, and (b) the filename with |
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| 211 | * which it was actually loaded. */ |
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| 212 | char *loaded_filename; |
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| 213 | }; |
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| 214 | |
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| 215 | |
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| 216 | DSO * DSO_new(void); |
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| 217 | DSO * DSO_new_method(DSO_METHOD *method); |
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| 218 | int DSO_free(DSO *dso); |
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| 219 | int DSO_flags(DSO *dso); |
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| 220 | int DSO_up_ref(DSO *dso); |
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| 221 | long DSO_ctrl(DSO *dso, int cmd, long larg, void *parg); |
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| 222 | |
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| 223 | /* This function sets the DSO's name_converter callback. If it is non-NULL, |
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| 224 | * then it will be used instead of the associated DSO_METHOD's function. If |
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| 225 | * oldcb is non-NULL then it is set to the function pointer value being |
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| 226 | * replaced. Return value is non-zero for success. */ |
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| 227 | int DSO_set_name_converter(DSO *dso, DSO_NAME_CONVERTER_FUNC cb, |
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| 228 | DSO_NAME_CONVERTER_FUNC *oldcb); |
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| 229 | /* These functions can be used to get/set the platform-independant filename |
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| 230 | * used for a DSO. NB: set will fail if the DSO is already loaded. */ |
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| 231 | const char *DSO_get_filename(DSO *dso); |
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| 232 | int DSO_set_filename(DSO *dso, const char *filename); |
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| 233 | /* This function will invoke the DSO's name_converter callback to translate a |
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| 234 | * filename, or if the callback isn't set it will instead use the DSO_METHOD's |
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| 235 | * converter. If "filename" is NULL, the "filename" in the DSO itself will be |
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| 236 | * used. If the DSO_FLAG_NO_NAME_TRANSLATION flag is set, then the filename is |
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| 237 | * simply duplicated. NB: This function is usually called from within a |
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| 238 | * DSO_METHOD during the processing of a DSO_load() call, and is exposed so that |
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| 239 | * caller-created DSO_METHODs can do the same thing. A non-NULL return value |
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| 240 | * will need to be OPENSSL_free()'d. */ |
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| 241 | char *DSO_convert_filename(DSO *dso, const char *filename); |
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| 242 | /* This function will invoke the DSO's merger callback to merge two file |
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| 243 | * specifications, or if the callback isn't set it will instead use the |
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| 244 | * DSO_METHOD's merger. A non-NULL return value will need to be |
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| 245 | * OPENSSL_free()'d. */ |
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| 246 | char *DSO_merge(DSO *dso, const char *filespec1, const char *filespec2); |
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| 247 | /* If the DSO is currently loaded, this returns the filename that it was loaded |
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| 248 | * under, otherwise it returns NULL. So it is also useful as a test as to |
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| 249 | * whether the DSO is currently loaded. NB: This will not necessarily return |
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| 250 | * the same value as DSO_convert_filename(dso, dso->filename), because the |
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| 251 | * DSO_METHOD's load function may have tried a variety of filenames (with |
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| 252 | * and/or without the aid of the converters) before settling on the one it |
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| 253 | * actually loaded. */ |
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| 254 | const char *DSO_get_loaded_filename(DSO *dso); |
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| 255 | |
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| 256 | void DSO_set_default_method(DSO_METHOD *meth); |
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| 257 | DSO_METHOD *DSO_get_default_method(void); |
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| 258 | DSO_METHOD *DSO_get_method(DSO *dso); |
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| 259 | DSO_METHOD *DSO_set_method(DSO *dso, DSO_METHOD *meth); |
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| 260 | |
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| 261 | /* The all-singing all-dancing load function, you normally pass NULL |
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| 262 | * for the first and third parameters. Use DSO_up and DSO_free for |
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| 263 | * subsequent reference count handling. Any flags passed in will be set |
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| 264 | * in the constructed DSO after its init() function but before the |
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| 265 | * load operation. If 'dso' is non-NULL, 'flags' is ignored. */ |
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| 266 | DSO *DSO_load(DSO *dso, const char *filename, DSO_METHOD *meth, int flags); |
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| 267 | |
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| 268 | /* This function binds to a variable inside a shared library. */ |
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| 269 | void *DSO_bind_var(DSO *dso, const char *symname); |
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| 270 | |
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| 271 | /* This function binds to a function inside a shared library. */ |
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| 272 | DSO_FUNC_TYPE DSO_bind_func(DSO *dso, const char *symname); |
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| 273 | |
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| 274 | /* This method is the default, but will beg, borrow, or steal whatever |
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| 275 | * method should be the default on any particular platform (including |
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| 276 | * DSO_METH_null() if necessary). */ |
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| 277 | DSO_METHOD *DSO_METHOD_openssl(void); |
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| 278 | |
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| 279 | /* This method is defined for all platforms - if a platform has no |
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| 280 | * DSO support then this will be the only method! */ |
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| 281 | DSO_METHOD *DSO_METHOD_null(void); |
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| 282 | |
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| 283 | /* If DSO_DLFCN is defined, the standard dlfcn.h-style functions |
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| 284 | * (dlopen, dlclose, dlsym, etc) will be used and incorporated into |
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| 285 | * this method. If not, this method will return NULL. */ |
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| 286 | DSO_METHOD *DSO_METHOD_dlfcn(void); |
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| 287 | |
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| 288 | /* If DSO_DL is defined, the standard dl.h-style functions (shl_load, |
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| 289 | * shl_unload, shl_findsym, etc) will be used and incorporated into |
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| 290 | * this method. If not, this method will return NULL. */ |
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| 291 | DSO_METHOD *DSO_METHOD_dl(void); |
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| 292 | |
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| 293 | /* If WIN32 is defined, use DLLs. If not, return NULL. */ |
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| 294 | DSO_METHOD *DSO_METHOD_win32(void); |
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| 295 | |
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| 296 | /* If VMS is defined, use shared images. If not, return NULL. */ |
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| 297 | DSO_METHOD *DSO_METHOD_vms(void); |
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| 298 | |
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| 299 | /* BEGIN ERROR CODES */ |
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| 300 | /* The following lines are auto generated by the script mkerr.pl. Any changes |
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| 301 | * made after this point may be overwritten when the script is next run. |
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| 302 | */ |
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| 303 | void ERR_load_DSO_strings(void); |
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| 304 | |
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| 305 | /* Error codes for the DSO functions. */ |
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| 306 | |
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| 307 | /* Function codes. */ |
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| 308 | #define DSO_F_DLFCN_BIND_FUNC 100 |
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| 309 | #define DSO_F_DLFCN_BIND_VAR 101 |
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| 310 | #define DSO_F_DLFCN_LOAD 102 |
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| 311 | #define DSO_F_DLFCN_MERGER 130 |
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| 312 | #define DSO_F_DLFCN_NAME_CONVERTER 123 |
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| 313 | #define DSO_F_DLFCN_UNLOAD 103 |
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| 314 | #define DSO_F_DL_BIND_FUNC 104 |
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| 315 | #define DSO_F_DL_BIND_VAR 105 |
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| 316 | #define DSO_F_DL_LOAD 106 |
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| 317 | #define DSO_F_DL_MERGER 131 |
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| 318 | #define DSO_F_DL_NAME_CONVERTER 124 |
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| 319 | #define DSO_F_DL_UNLOAD 107 |
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| 320 | #define DSO_F_DSO_BIND_FUNC 108 |
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| 321 | #define DSO_F_DSO_BIND_VAR 109 |
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| 322 | #define DSO_F_DSO_CONVERT_FILENAME 126 |
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| 323 | #define DSO_F_DSO_CTRL 110 |
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| 324 | #define DSO_F_DSO_FREE 111 |
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| 325 | #define DSO_F_DSO_GET_FILENAME 127 |
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| 326 | #define DSO_F_DSO_GET_LOADED_FILENAME 128 |
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| 327 | #define DSO_F_DSO_LOAD 112 |
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| 328 | #define DSO_F_DSO_MERGE 132 |
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| 329 | #define DSO_F_DSO_NEW_METHOD 113 |
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| 330 | #define DSO_F_DSO_SET_FILENAME 129 |
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| 331 | #define DSO_F_DSO_SET_NAME_CONVERTER 122 |
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| 332 | #define DSO_F_DSO_UP_REF 114 |
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| 333 | #define DSO_F_VMS_BIND_SYM 115 |
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| 334 | #define DSO_F_VMS_LOAD 116 |
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| 335 | #define DSO_F_VMS_MERGER 133 |
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| 336 | #define DSO_F_VMS_UNLOAD 117 |
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| 337 | #define DSO_F_WIN32_BIND_FUNC 118 |
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| 338 | #define DSO_F_WIN32_BIND_VAR 119 |
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| 339 | #define DSO_F_WIN32_JOINER 135 |
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| 340 | #define DSO_F_WIN32_LOAD 120 |
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| 341 | #define DSO_F_WIN32_MERGER 134 |
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| 342 | #define DSO_F_WIN32_NAME_CONVERTER 125 |
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| 343 | #define DSO_F_WIN32_SPLITTER 136 |
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| 344 | #define DSO_F_WIN32_UNLOAD 121 |
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| 345 | |
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| 346 | /* Reason codes. */ |
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| 347 | #define DSO_R_CTRL_FAILED 100 |
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| 348 | #define DSO_R_DSO_ALREADY_LOADED 110 |
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| 349 | #define DSO_R_EMPTY_FILE_STRUCTURE 113 |
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| 350 | #define DSO_R_FAILURE 114 |
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| 351 | #define DSO_R_FILENAME_TOO_BIG 101 |
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| 352 | #define DSO_R_FINISH_FAILED 102 |
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| 353 | #define DSO_R_INCORRECT_FILE_SYNTAX 115 |
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| 354 | #define DSO_R_LOAD_FAILED 103 |
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| 355 | #define DSO_R_NAME_TRANSLATION_FAILED 109 |
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| 356 | #define DSO_R_NO_FILENAME 111 |
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| 357 | #define DSO_R_NO_FILE_SPECIFICATION 116 |
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| 358 | #define DSO_R_NULL_HANDLE 104 |
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| 359 | #define DSO_R_SET_FILENAME_FAILED 112 |
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| 360 | #define DSO_R_STACK_ERROR 105 |
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| 361 | #define DSO_R_SYM_FAILURE 106 |
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| 362 | #define DSO_R_UNLOAD_FAILED 107 |
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| 363 | #define DSO_R_UNSUPPORTED 108 |
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| 364 | |
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| 365 | #ifdef __cplusplus |
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| 366 | } |
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| 367 | #endif |
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| 368 | #endif |
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