ERR_get_error

- NAME
- SYNOPSIS
- DESCRIPTION
- RETURN VALUES
- SEE ALSO
- 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_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_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 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 filename 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.

# 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)

# COPYRIGHT

Copyright 2000-2020 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.