76 lines
2.5 KiB
Plaintext
76 lines
2.5 KiB
Plaintext
=pod
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=head1 NAME
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ERR_put_error, ERR_add_error_data, ERR_add_error_vdata - record an error
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=head1 SYNOPSIS
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#include <openssl/err.h>
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void ERR_put_error(int lib, int func, int reason, const char *file, int line);
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void ERR_add_error_data(int num, ...);
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void ERR_add_error_vdata(int num, va_list arg);
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=head1 DESCRIPTION
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ERR_put_error() adds an error code to the thread's error queue. It
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signals that the error of reason code B<reason> occurred in function
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B<func> of library B<lib>, in line number B<line> of B<file>.
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This function is usually called by a macro.
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ERR_add_error_data() associates the concatenation of its B<num> string
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arguments with the error code added last.
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ERR_add_error_vdata() is similar except the argument is a B<va_list>.
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L<ERR_load_strings(3)> can be used to register
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error strings so that the application can a generate human-readable
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error messages for the error code.
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=head2 Reporting errors
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Each sub-library has a specific macro XXXerr() that is used to report
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errors. Its first argument is a function code B<XXX_F_...>, the second
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argument is a reason code B<XXX_R_...>. Function codes are derived
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from the function names; reason codes consist of textual error
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descriptions. For example, the function ssl3_read_bytes() reports a
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"handshake failure" as follows:
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SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE);
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Function and reason codes should consist of uppercase characters,
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numbers and underscores only. The error file generation script translates
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function codes into function names by looking in the header files
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for an appropriate function name, if none is found it just uses
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the capitalized form such as "SSL3_READ_BYTES" in the above example.
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The trailing section of a reason code (after the "_R_") is translated
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into lowercase and underscores changed to spaces.
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Although a library will normally report errors using its own specific
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XXXerr macro, another library's macro can be used. This is normally
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only done when a library wants to include ASN1 code which must use
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the ASN1err() macro.
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=head1 RETURN VALUES
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ERR_put_error() and ERR_add_error_data() return
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no values.
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=head1 SEE ALSO
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L<ERR_load_strings(3)>
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=head1 COPYRIGHT
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Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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