=pod =head1 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 =head1 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); =head1 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 L<ERR_GET_LIB(3)|ERR_GET_LIB(3)> for obtaining information about location and reason of the error, and L<ERR_error_string(3)|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 *B<file> and *B<line>, unless these are B<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 *B<data> and *B<flags>, unless these are B<NULL>. *B<data> contains a string if *B<flags>&B<ERR_TXT_STRING>. If it has been allocated by OPENSSL_malloc(), *B<flags>&B<ERR_TXT_MALLOCED> is true. =head1 RETURN VALUES The error code, or 0 if there is no error in the queue. =head1 SEE ALSO L<err(3)|err(3)>, L<ERR_error_string(3)|ERR_error_string(3)>, L<ERR_GET_LIB(3)|ERR_GET_LIB(3)> =head1 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. =cut