=pod

=head1 NAME

ERR_raise, ERR_raise_data,
ERR_put_error, ERR_add_error_data, ERR_add_error_vdata
- record an error

=head1 SYNOPSIS

 #include <openssl/err.h>

 void ERR_raise(int lib, int reason);
 void ERR_raise_data(int lib, int reason, const char *fmt, ...);

 void ERR_add_error_data(int num, ...);
 void ERR_add_error_vdata(int num, va_list arg);

Deprecated since OpenSSL 3.0:

 void ERR_put_error(int lib, int func, int reason, const char *file, int line);

=head1 DESCRIPTION

ERR_raise() adds a new error to the thread's error queue.  The
error occurred in the library B<lib> for the reason given by the
B<reason> code.  Furthermore, the name of the file, the line, and name
of the function where the error occurred is saved with the error
record.

ERR_raise_data() does the same thing as ERR_raise(), but also lets the
caller specify additional information as a format string B<fmt> and an
arbitrary number of values, which are processed with L<BIO_snprintf(3)>.  

ERR_put_error() adds an error code to the thread's error queue. It
signals that the error of reason code B<reason> occurred in function
B<func> of library B<lib>, in line number B<line> of B<file>.
This function is usually called by a macro.

ERR_add_error_data() associates the concatenation of its B<num> string
arguments with the error code added last.
ERR_add_error_vdata() is similar except the argument is a B<va_list>.
Multiple calls to these functions append to the current top of the error queue.

L<ERR_load_strings(3)> can be used to register
error strings so that the application can a generate human-readable
error messages for the error code.

=head2 Reporting errors

=for comment TODO(3.0) should this be internal documentation?

Each sub-library has a specific macro XXXerr() that is used to report
errors. Its first argument is a function code B<XXX_F_...>, the second
argument is a reason code B<XXX_R_...>. Function codes are derived
from the function names; reason codes consist of textual error
descriptions. For example, the function ssl3_read_bytes() reports a
"handshake failure" as follows:

 SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE);

Function and reason codes should consist of uppercase characters,
numbers and underscores only. The error file generation script translates
function codes into function names by looking in the header files
for an appropriate function name, if none is found it just uses
the capitalized form such as "SSL3_READ_BYTES" in the above example.

The trailing section of a reason code (after the "_R_") is translated
into lowercase and underscores changed to spaces.

Although a library will normally report errors using its own specific
XXXerr macro, another library's macro can be used. This is normally
only done when a library wants to include ASN1 code which must use
the ASN1err() macro.


=head1 RETURN VALUES

ERR_raise(), ERR_put_error(), ERR_add_error_data() and
ERR_add_error_vdata() return no values.

=head1 NOTES

ERR_raise() and ERR_put_error() are implemented as macros.

=head1 SEE ALSO

L<ERR_load_strings(3)>

=head1 COPYRIGHT

Copyright 2000-2019 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
L<https://www.openssl.org/source/license.html>.

=cut