ERR_get_error

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

# 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 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_get_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. If it has been allocated by `OPENSSL_malloc()`, *flags&ERR_TXT_MALLOCED is true.

# RETURN VALUES

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

# SEE ALSO

err(3), ERR_error_string(3), ERR_GET_LIB(3)

# HISTORY

`ERR_get_error()`, `ERR_peek_error()`, `ERR_get_error_line()` and `ERR_peek_error_line()` are available in all versions of SSLeay and OpenSSL. `ERR_get_error_line_data()` and `ERR_peek_error_line_data()` were added in SSLeay 0.9.0. `ERR_peek_last_error()`, `ERR_peek_last_error_line()` and `ERR_peek_last_error_line_data()` were added in OpenSSL 0.9.7.

ERR_get_error