ERR_GET_ERROR(3) Library Functions Manual ERR_GET_ERROR(3)
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 OpenSSL 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 the location and reason for 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 free(3) 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(3), ERR_error_string(3), ERR_GET_LIB(3)
HISTORY
ERR_get_error() and ERR_peek_error() first appeared in SSLeay 0.4.4. ERR_get_error_line() and ERR_peek_error_line() first appeared in SSLeay 0.6.0. ERR_get_error_line_data() and ERR_peek_error_line_data() first appeared in SSLeay 0.9.0. All these functions have been available since OpenBSD 2.4.
ERR_peek_last_error(), ERR_peek_last_error_line(), and ERR_peek_last_error_line_data() first appeared in OpenSSL 0.9.7 and have been available since OpenBSD 3.2. GNU March 27, 2018 ERR_GET_ERROR(3)