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-=pod
-
-=head1 NAME
-
-err - error codes
-
-=head1 SYNOPSIS
-
- #include <openssl/err.h>
-
- unsigned long ERR_get_error(void);
- unsigned long ERR_peek_error(void);
- unsigned long ERR_get_error_line(const char **file, int *line);
- unsigned long ERR_peek_error_line(const char **file, int *line);
- unsigned long ERR_get_error_line_data(const char **file, int *line,
- const char **data, int *flags);
- unsigned long ERR_peek_error_line_data(const char **file, int *line,
- const char **data, int *flags);
-
- int ERR_GET_LIB(unsigned long e);
- int ERR_GET_FUNC(unsigned long e);
- int ERR_GET_REASON(unsigned long e);
-
- void ERR_clear_error(void);
-
- char *ERR_error_string(unsigned long e, char *buf);
- const char *ERR_lib_error_string(unsigned long e);
- const char *ERR_func_error_string(unsigned long e);
- const char *ERR_reason_error_string(unsigned long e);
-
- void ERR_print_errors(BIO *bp);
- void ERR_print_errors_fp(FILE *fp);
-
- void ERR_load_crypto_strings(void);
- void ERR_free_strings(void);
-
- void ERR_remove_state(unsigned long pid);
-
- void ERR_put_error(int lib, int func, int reason, const char *file,
- int line);
- void ERR_add_error_data(int num, ...);
-
- void ERR_load_strings(int lib,ERR_STRING_DATA str[]);
- unsigned long ERR_PACK(int lib, int func, int reason);
- int ERR_get_next_error_library(void);
-
-=head1 DESCRIPTION
-
-When a call to the OpenSSL library fails, this is usually signalled
-by the return value, and an error code is stored in an error queue
-associated with the current thread. The B<err> library provides
-functions to obtain these error codes and textual error messages.
-
-The L<ERR_get_error(3)|ERR_get_error(3)> manpage describes how to
-access error codes.
-
-Error codes contain information about where the error occurred, and
-what went wrong. L<ERR_GET_LIB(3)|ERR_GET_LIB(3)> describes how to
-extract this information. A method to obtain human-readable error
-messages is described in L<ERR_error_string(3)|ERR_error_string(3)>.
-
-L<ERR_clear_error(3)|ERR_clear_error(3)> can be used to clear the
-error queue.
-
-Note that L<ERR_remove_state(3)|ERR_remove_state(3)> should be used to
-avoid memory leaks when threads are terminated.
-
-=head1 ADDING NEW ERROR CODES TO OPENSSL
-
-See L<ERR_put_error(3)> if you want to record error codes in the
-OpenSSL error system from within your application.
-
-The remainder of this section is of interest only if you want to add
-new error codes to OpenSSL or add error codes from external libraries.
-
-=head2 Reporting errors
-
-Each sub-library has a specific macro XXXerr() that is used to report
-errors. Its first argument is a function code B<XXX_F_...>, the second
-argument is a reason code B<XXX_R_...>. Function codes are derived
-from the function names; reason codes consist of textual error
-descriptions. For example, the function ssl23_read() reports a
-"handshake failure" as follows:
-
- SSLerr(SSL_F_SSL23_READ, SSL_R_SSL_HANDSHAKE_FAILURE);
-
-Function and reason codes should consist of upper case characters,
-numbers and underscores only. The error file generation script translates
-function codes into function names by looking in the header files
-for an appropriate function name, if none is found it just uses
-the capitalized form such as "SSL23_READ" in the above example.
-
-The trailing section of a reason code (after the "_R_") is translated
-into lower case and underscores changed to spaces.
-
-When you are using new function or reason codes, run B<make errors>.
-The necessary B<#define>s will then automatically be added to the
-sub-library's header file.
-
-Although a library will normally report errors using its own specific
-XXXerr macro, another library's macro can be used. This is normally
-only done when a library wants to include ASN1 code which must use
-the ASN1err() macro.
-
-=head2 Adding new libraries
-
-When adding a new sub-library to OpenSSL, assign it a library number
-B<ERR_LIB_XXX>, define a macro XXXerr() (both in B<err.h>), add its
-name to B<ERR_str_libraries[]> (in B<crypto/err/err.c>), and add
-C<ERR_load_XXX_strings()> to the ERR_load_crypto_strings() function
-(in B<crypto/err/err_all.c>). Finally, add an entry
-
- L XXX xxx.h xxx_err.c
-
-to B<crypto/err/openssl.ec>, and add B<xxx_err.c> to the Makefile.
-Running B<make errors> will then generate a file B<xxx_err.c>, and
-add all error codes used in the library to B<xxx.h>.
-
-Additionally the library include file must have a certain form.
-Typically it will initially look like this:
-
- #ifndef HEADER_XXX_H
- #define HEADER_XXX_H
-
- #ifdef __cplusplus
- extern "C" {
- #endif
-
- /* Include files */
-
- #include <openssl/bio.h>
- #include <openssl/x509.h>
-
- /* Macros, structures and function prototypes */
-
-
- /* BEGIN ERROR CODES */
-
-The B<BEGIN ERROR CODES> sequence is used by the error code
-generation script as the point to place new error codes, any text
-after this point will be overwritten when B<make errors> is run.
-The closing #endif etc will be automatically added by the script.
-
-The generated C error code file B<xxx_err.c> will load the header
-files B<stdio.h>, B<openssl/err.h> and B<openssl/xxx.h> so the
-header file must load any additional header files containing any
-definitions it uses.
-
-=head1 USING ERROR CODES IN EXTERNAL LIBRARIES
-
-It is also possible to use OpenSSL's error code scheme in external
-libraries. The library needs to load its own codes and call the OpenSSL
-error code insertion script B<mkerr.pl> explicitly to add codes to
-the header file and generate the C error code file. This will normally
-be done if the external library needs to generate new ASN1 structures
-but it can also be used to add more general purpose error code handling.
-
-TBA more details
-
-=head1 INTERNALS
-
-The error queues are stored in a hash table with one B<ERR_STATE>
-entry for each pid. ERR_get_state() returns the current thread's
-B<ERR_STATE>. An B<ERR_STATE> can hold up to B<ERR_NUM_ERRORS> error
-codes. When more error codes are added, the old ones are overwritten,
-on the assumption that the most recent errors are most important.
-
-Error strings are also stored in hash table. The hash tables can
-be obtained by calling ERR_get_err_state_table(void) and
-ERR_get_string_table(void) respectively.
-
-=head1 SEE ALSO
-
-L<CRYPTO_set_locking_callback(3)|CRYPTO_set_locking_callback(3)>,
-L<ERR_get_error(3)|ERR_get_error(3)>,
-L<ERR_GET_LIB(3)|ERR_GET_LIB(3)>,
-L<ERR_clear_error(3)|ERR_clear_error(3)>,
-L<ERR_error_string(3)|ERR_error_string(3)>,
-L<ERR_print_errors(3)|ERR_print_errors(3)>,
-L<ERR_load_crypto_strings(3)|ERR_load_crypto_strings(3)>,
-L<ERR_remove_state(3)|ERR_remove_state(3)>,
-L<ERR_put_error(3)|ERR_put_error(3)>,
-L<ERR_load_strings(3)|ERR_load_strings(3)>,
-L<SSL_get_error(3)|SSL_get_error(3)>
-
-=cut