dso.h

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	STACK *meth_data;
	int references;
	int flags;
	/* For use by applications etc ... use this for your bits'n'pieces,
	 * don't touch meth_data! */
	CRYPTO_EX_DATA ex_data;
	/* If this callback function pointer is set to non-NULL, then it will
	 * be used in DSO_load() in place of meth->dso_name_converter. NB: This
	 * should normally set using DSO_set_name_converter(). */
	DSO_NAME_CONVERTER_FUNC name_converter;
	/* If this callback function pointer is set to non-NULL, then it will
	 * be used in DSO_load() in place of meth->dso_merger. NB: This
	 * should normally set using DSO_set_merger(). */
	DSO_MERGER_FUNC merger;
	/* This is populated with (a copy of) the platform-independant
	 * filename used for this DSO. */
	char *filename;
	/* This is populated with (a copy of) the translated filename by which
	 * the DSO was actually loaded. It is NULL iff the DSO is not currently
	 * loaded. NB: This is here because the filename translation process
	 * may involve a callback being invoked more than once not only to
	 * convert to a platform-specific form, but also to try different
	 * filenames in the process of trying to perform a load. As such, this
	 * variable can be used to indicate (a) whether this DSO structure
	 * corresponds to a loaded library or not, and (b) the filename with
	 * which it was actually loaded. */
	char *loaded_filename;
	};


DSO *	DSO_new(void);
DSO *	DSO_new_method(DSO_METHOD *method);
int	DSO_free(DSO *dso);
int	DSO_flags(DSO *dso);
int	DSO_up_ref(DSO *dso);
long	DSO_ctrl(DSO *dso, int cmd, long larg, void *parg);

/* This function sets the DSO's name_converter callback. If it is non-NULL,
 * then it will be used instead of the associated DSO_METHOD's function. If
 * oldcb is non-NULL then it is set to the function pointer value being
 * replaced. Return value is non-zero for success. */
int	DSO_set_name_converter(DSO *dso, DSO_NAME_CONVERTER_FUNC cb,
				DSO_NAME_CONVERTER_FUNC *oldcb);
/* These functions can be used to get/set the platform-independant filename
 * used for a DSO. NB: set will fail if the DSO is already loaded. */
const char *DSO_get_filename(DSO *dso);
int	DSO_set_filename(DSO *dso, const char *filename);
/* This function will invoke the DSO's name_converter callback to translate a
 * filename, or if the callback isn't set it will instead use the DSO_METHOD's
 * converter. If "filename" is NULL, the "filename" in the DSO itself will be
 * used. If the DSO_FLAG_NO_NAME_TRANSLATION flag is set, then the filename is
 * simply duplicated. NB: This function is usually called from within a
 * DSO_METHOD during the processing of a DSO_load() call, and is exposed so that
 * caller-created DSO_METHODs can do the same thing. A non-NULL return value
 * will need to be OPENSSL_free()'d. */
char	*DSO_convert_filename(DSO *dso, const char *filename);
/* This function will invoke the DSO's merger callback to merge two file
 * specifications, or if the callback isn't set it will instead use the
 * DSO_METHOD's merger.  A non-NULL return value will need to be
 * OPENSSL_free()'d. */
char	*DSO_merge(DSO *dso, const char *filespec1, const char *filespec2);
/* If the DSO is currently loaded, this returns the filename that it was loaded
 * under, otherwise it returns NULL. So it is also useful as a test as to
 * whether the DSO is currently loaded. NB: This will not necessarily return
 * the same value as DSO_convert_filename(dso, dso->filename), because the
 * DSO_METHOD's load function may have tried a variety of filenames (with
 * and/or without the aid of the converters) before settling on the one it
 * actually loaded. */
const char *DSO_get_loaded_filename(DSO *dso);

void	DSO_set_default_method(DSO_METHOD *meth);
DSO_METHOD *DSO_get_default_method(void);
DSO_METHOD *DSO_get_method(DSO *dso);
DSO_METHOD *DSO_set_method(DSO *dso, DSO_METHOD *meth);

/* The all-singing all-dancing load function, you normally pass NULL
 * for the first and third parameters. Use DSO_up and DSO_free for
 * subsequent reference count handling. Any flags passed in will be set
 * in the constructed DSO after its init() function but before the
 * load operation. If 'dso' is non-NULL, 'flags' is ignored. */
DSO *DSO_load(DSO *dso, const char *filename, DSO_METHOD *meth, int flags);

/* This function binds to a variable inside a shared library. */
void *DSO_bind_var(DSO *dso, const char *symname);

/* This function binds to a function inside a shared library. */
DSO_FUNC_TYPE DSO_bind_func(DSO *dso, const char *symname);

/* This method is the default, but will beg, borrow, or steal whatever
 * method should be the default on any particular platform (including
 * DSO_METH_null() if necessary). */
DSO_METHOD *DSO_METHOD_openssl(void);

/* This method is defined for all platforms - if a platform has no
 * DSO support then this will be the only method! */
DSO_METHOD *DSO_METHOD_null(void);

/* If DSO_DLFCN is defined, the standard dlfcn.h-style functions
 * (dlopen, dlclose, dlsym, etc) will be used and incorporated into
 * this method. If not, this method will return NULL. */
DSO_METHOD *DSO_METHOD_dlfcn(void);

/* If DSO_DL is defined, the standard dl.h-style functions (shl_load, 
 * shl_unload, shl_findsym, etc) will be used and incorporated into
 * this method. If not, this method will return NULL. */
DSO_METHOD *DSO_METHOD_dl(void);

/* If WIN32 is defined, use DLLs. If not, return NULL. */
DSO_METHOD *DSO_METHOD_win32(void);

/* If VMS is defined, use shared images. If not, return NULL. */
DSO_METHOD *DSO_METHOD_vms(void);

/* BEGIN ERROR CODES */
/* The following lines are auto generated by the script mkerr.pl. Any changes
 * made after this point may be overwritten when the script is next run.
 */
void ERR_load_DSO_strings(void);

/* Error codes for the DSO functions. */

/* Function codes. */
#define DSO_F_DLFCN_BIND_FUNC				 100
#define DSO_F_DLFCN_BIND_VAR				 101
#define DSO_F_DLFCN_LOAD				 102
#define DSO_F_DLFCN_MERGER				 130
#define DSO_F_DLFCN_NAME_CONVERTER			 123
#define DSO_F_DLFCN_UNLOAD				 103
#define DSO_F_DL_BIND_FUNC				 104
#define DSO_F_DL_BIND_VAR				 105
#define DSO_F_DL_LOAD					 106
#define DSO_F_DL_MERGER					 131
#define DSO_F_DL_NAME_CONVERTER				 124
#define DSO_F_DL_UNLOAD					 107
#define DSO_F_DSO_BIND_FUNC				 108
#define DSO_F_DSO_BIND_VAR				 109
#define DSO_F_DSO_CONVERT_FILENAME			 126
#define DSO_F_DSO_CTRL					 110
#define DSO_F_DSO_FREE					 111
#define DSO_F_DSO_GET_FILENAME				 127
#define DSO_F_DSO_GET_LOADED_FILENAME			 128
#define DSO_F_DSO_LOAD					 112
#define DSO_F_DSO_MERGE					 132
#define DSO_F_DSO_NEW_METHOD				 113
#define DSO_F_DSO_SET_FILENAME				 129
#define DSO_F_DSO_SET_NAME_CONVERTER			 122
#define DSO_F_DSO_UP_REF				 114
#define DSO_F_VMS_BIND_SYM				 115
#define DSO_F_VMS_LOAD					 116
#define DSO_F_VMS_MERGER				 133
#define DSO_F_VMS_UNLOAD				 117
#define DSO_F_WIN32_BIND_FUNC				 118
#define DSO_F_WIN32_BIND_VAR				 119
#define DSO_F_WIN32_JOINER				 135
#define DSO_F_WIN32_LOAD				 120
#define DSO_F_WIN32_MERGER				 134
#define DSO_F_WIN32_NAME_CONVERTER			 125
#define DSO_F_WIN32_SPLITTER				 136
#define DSO_F_WIN32_UNLOAD				 121

/* Reason codes. */
#define DSO_R_CTRL_FAILED				 100
#define DSO_R_DSO_ALREADY_LOADED			 110
#define DSO_R_EMPTY_FILE_STRUCTURE			 113
#define DSO_R_FAILURE					 114
#define DSO_R_FILENAME_TOO_BIG				 101
#define DSO_R_FINISH_FAILED				 102
#define DSO_R_INCORRECT_FILE_SYNTAX			 115
#define DSO_R_LOAD_FAILED				 103
#define DSO_R_NAME_TRANSLATION_FAILED			 109
#define DSO_R_NO_FILENAME				 111
#define DSO_R_NO_FILE_SPECIFICATION			 116
#define DSO_R_NULL_HANDLE				 104
#define DSO_R_SET_FILENAME_FAILED			 112
#define DSO_R_STACK_ERROR				 105
#define DSO_R_SYM_FAILURE				 106
#define DSO_R_UNLOAD_FAILED				 107
#define DSO_R_UNSUPPORTED				 108

#ifdef  __cplusplus
}
#endif
#endif