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ERR_GET_ERROR(3) OpenSSL ERR_GET_ERROR(3)
 

ERR_get_error, ERR_peek_error, ERR_peek_last_error, ERR_get_error_line, ERR_peek_error_line, ERR_peek_last_error_line, ERR_get_error_line_data, ERR_peek_error_line_data, ERR_peek_last_error_line_data - obtain error code and data

 #include <openssl/err.h>
 unsigned long ERR_get_error(void);
 unsigned long ERR_peek_error(void);
 unsigned long ERR_peek_last_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_peek_last_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);
 unsigned long ERR_peek_last_error_line_data(const char **file, int *line,
                                             const char **data, int *flags);

ERR_get_error() returns the earliest error code from the thread's error queue and removes the entry. This function can be called repeatedly until there are no more error codes to return.
ERR_peek_error() returns the earliest error code from the thread's error queue without modifying it.
ERR_peek_last_error() returns the latest error code from the thread's error queue without modifying it.
See ERR_GET_LIB(3) for obtaining information about location and reason of the error, and ERR_error_string(3) for human-readable error messages.
ERR_get_error_line(), ERR_peek_error_line() and ERR_peek_last_error_line() are the same as the above, but they additionally store the file name and line number where the error occurred in * file and *line, unless these are NULL.
ERR_get_error_line_data(), ERR_peek_error_line_data() and ERR_peek_last_error_line_data() store additional data and flags associated with the error code in * data and * flags, unless these are NULL. *data contains a string if * flags&ERR_TXT_STRING is true.
An application MUST NOT free the *data pointer (or any other pointers returned by these functions) with OPENSSL_free() as freeing is handled automatically by the error library.

The error code, or 0 if there is no error in the queue.

ERR_error_string(3), ERR_GET_LIB(3)

Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the OpenSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <https://www.openssl.org/source/license.html>.
2018-11-20 1.1.1a

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