- NAME
- SYNOPSIS
- DESCRIPTION
- RETURN VALUES
- SEE ALSO
- HISTORY
- COPYRIGHT

# NAME

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_func, ERR_peek_error_func, ERR_peek_last_error_func, ERR_get_error_data, ERR_peek_error_data, ERR_peek_last_error_data, ERR_get_error_all, ERR_peek_error_all, ERR_peek_last_error_all, ERR_get_error_line_data, ERR_peek_error_line_data, ERR_peek_last_error_line_data - obtain error code and data

# SYNOPSIS

     #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_func(const char **func);
     unsigned long ERR_peek_error_func(const char **func);
     unsigned long ERR_peek_last_error_func(const char **func);

     unsigned long ERR_get_error_data(const char **data, int *flags);
     unsigned long ERR_peek_error_data(const char **data, int *flags);
     unsigned long ERR_peek_last_error_data(const char **data, int *flags);

     unsigned long ERR_get_error_all(const char **file, int *line,
                                     const char *func,
                                     const char **data, int *flags);
     unsigned long ERR_peek_error_all(const char **file, int *line,
                                      const char *func,
                                      const char **data, int *flags);
     unsigned long ERR_peek_last_error_all(const char **file, int *line,
                                           const char *func,
                                           const char **data, int *flags);

Deprecated since OpenSSL 3.0:

     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);

# DESCRIPTION

`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 further specific information such as the 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 `ERR_get_error()`, `ERR_peek_error()` and `ERR_peek_last_error()`, but on success they additionally store the filename and line number where the error occurred in *file and *line, as far as they are not NULL. An unset filename is indicated as "", i.e., an empty string. An unset line number is indicated as 0.

A pointer returned this way by these functions and the ones below is valid until the respective entry is removed from the error queue.

`ERR_get_error_func()`, `ERR_peek_error_func()` and `ERR_peek_last_error_func()` are the same as `ERR_get_error()`, `ERR_peek_error()` and `ERR_peek_last_error()`, but on success they additionally store the name of the function where the error occurred in *func, unless it is NULL. An unset function name is indicated as "".

`ERR_get_error_data()`, `ERR_peek_error_data()` and `ERR_peek_last_error_data()` are the same as `ERR_get_error()`, `ERR_peek_error()` and `ERR_peek_last_error()`, but on success they additionally store additional data and flags associated with the error code in *data and *flags, as far as they are not NULL. Unset data is indicated as "". In this case the value given for the flag is irrelevant (and equals 0). *data contains a string if *flags&ERR_TXT_STRING is true.

`ERR_get_error_all()`, `ERR_peek_error_all()` and `ERR_peek_last_error_all()` are combinations of all of the above.

`ERR_get_error_line_data()`, `ERR_peek_error_line_data()` and `ERR_peek_last_error_line_data()` are older variants of `ERR_get_error_all()`, `ERR_peek_error_all()` and `ERR_peek_last_error_all()`, and should no longer be used.

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.

# RETURN VALUES

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

# SEE ALSO

ERR_error_string(3), ERR_GET_LIB(3)

# HISTORY

`ERR_get_error_func()`, `ERR_peek_error_func()`, `ERR_peek_last_error_func()`, `ERR_get_error_data()`, `ERR_peek_error_data()`, `ERR_peek_last_error_data()`, `ERR_get_error_all()`, `ERR_peek_error_all()` and `ERR_peek_last_error_all()` were added in OpenSSL 3.0.

`ERR_get_error_line_data()`, `ERR_peek_error_line_data()` and `ERR_peek_last_error_line_data()` became deprecated in OpenSSL 3.0.

# COPYRIGHT

Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (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.