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56 lines
1.8 KiB
Markdown
56 lines
1.8 KiB
Markdown
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Adding new libraries
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====================
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When adding a new sub-library to OpenSSL, assign it a library number
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`ERR_LIB_XXX`, define a macro `XXXerr()` (both in `err.h`), add its
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name to `ERR_str_libraries[]` (in `crypto/err/err.c`), and add
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`ERR_load_XXX_strings()` to the `ERR_load_crypto_strings()` function
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(in `crypto/err/err_all.c`). Finally, add an entry:
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L XXX xxx.h xxx_err.c
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to `crypto/err/openssl.ec`, and add `xxx_err.c` to the `Makefile`.
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Running make errors will then generate a file `xxx_err.c`, and
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add all error codes used in the library to `xxx.h`.
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Additionally the library include file must have a certain form.
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Typically it will initially look like this:
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#ifndef HEADER_XXX_H
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#define HEADER_XXX_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Include files */
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#include <openssl/bio.h>
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#include <openssl/x509.h>
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/* Macros, structures and function prototypes */
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/* BEGIN ERROR CODES */
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The `BEGIN ERROR CODES` sequence is used by the error code
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generation script as the point to place new error codes, any text
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after this point will be overwritten when make errors is run.
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The closing `#endif` etc will be automatically added by the script.
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The generated C error code file `xxx_err.c` will load the header
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files `stdio.h`, `openssl/err.h` and `openssl/xxx.h` so the
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header file must load any additional header files containing any
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definitions it uses.
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Adding new error codes
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======================
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Instead of manually adding error codes into `crypto/err/openssl.txt`,
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it is recommended to leverage `make update` for error code generation.
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The target will process relevant sources and generate error codes for
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any *used* error codes.
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If an error code is added manually into `crypto/err/openssl.txt`,
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subsequent `make update` has no effect.
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