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1.\" $OpenBSD: ERR.3,v 1.11 2023/07/26 20:15:51 tb Exp $
2.\" OpenSSL 186bb907 Apr 13 11:05:13 2015 -0700
3.\"
4.\" This file was written by Ulf Moeller <ulf@openssl.org> and
5.\" Dr. Stephen Henson <steve@openssl.org>.
6.\" Copyright (c) 2000, 2015 The OpenSSL Project. All rights reserved.
7.\"
8.\" Redistribution and use in source and binary forms, with or without
9.\" modification, are permitted provided that the following conditions
10.\" are met:
11.\"
12.\" 1. Redistributions of source code must retain the above copyright
13.\" notice, this list of conditions and the following disclaimer.
14.\"
15.\" 2. Redistributions in binary form must reproduce the above copyright
16.\" notice, this list of conditions and the following disclaimer in
17.\" the documentation and/or other materials provided with the
18.\" distribution.
19.\"
20.\" 3. All advertising materials mentioning features or use of this
21.\" software must display the following acknowledgment:
22.\" "This product includes software developed by the OpenSSL Project
23.\" for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
24.\"
25.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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29.\"
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34.\" 6. Redistributions of any form whatsoever must retain the following
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40.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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51.\"
52.Dd $Mdocdate: July 26 2023 $
53.Dt ERR 3
54.Os
55.Sh NAME
56.Nm ERR
57.Nd OpenSSL error codes
58.Sh SYNOPSIS
59.In openssl/err.h
60.Sh DESCRIPTION
61When a call to the OpenSSL library fails, this is usually signaled by
62the return value, and an error code is stored in an error queue
63associated with the current thread.
64The
65.Nm
66library provides functions to obtain these error codes and textual error
67messages.
68The
69.Xr ERR_get_error 3
70manpage describes how to access error codes.
71.Pp
72Error codes contain information about where the error occurred, and what
73went wrong.
74.Xr ERR_GET_LIB 3
75describes how to extract this information.
76A method to obtain human-readable error messages is described in
77.Xr ERR_error_string 3 .
78.Pp
79.Xr ERR_clear_error 3
80can be used to clear the error queue.
81.Pp
82Note that
83.Xr ERR_remove_state 3
84should be used to avoid memory leaks when threads are terminated.
85.Sh ADDING NEW ERROR CODES TO OPENSSL
86See
87.Xr ERR_put_error 3
88if you want to record error codes in the OpenSSL error system from
89within your application.
90.Pp
91The remainder of this section is of interest only if you want to add new
92error codes to OpenSSL or add error codes from external libraries.
93.Pp
94When you are using new function or reason codes, run
95.Sy make errors .
96The necessary
97.Sy #define Ns s
98will then automatically be added to the sub-library's header file.
99.Ss Adding new libraries
100When adding a new sub-library to OpenSSL, assign it a library number
101.Dv ERR_LIB_XXX ,
102define a macro
103.Fn XXXerr
104(both in
105.In openssl/err.h ) ,
106add its name to
107.Va ERR_str_libraries[]
108(in
109.Pa /usr/src/lib/libcrypto/err/err.c ) ,
110and add
111.Fn ERR_load_XXX_strings
112to the
113.Fn ERR_load_crypto_strings
114function (in
115.Sy /usr/src/lib/libcrypto/err/err_all.c ) .
116Finally, add
117.Pa xxx_err.c
118to the
119.Pa Makefile .
120.Sh USING ERROR CODES IN EXTERNAL LIBRARIES
121It is also possible to use OpenSSL's error code scheme in external
122libraries.
123.Sh INTERNALS
124The error queues are stored in a hash table with one
125.Vt ERR_STATE
126entry for each PID.
127.Fn ERR_get_state
128returns the current thread's
129.Vt ERR_STATE .
130An
131.Vt ERR_STATE
132can hold up to
133.Dv ERR_NUM_ERRORS
134error codes.
135When more error codes are added, the old ones are overwritten, on the
136assumption that the most recent errors are most important.
137.Pp
138Error strings are also stored in a hash table.
139.Sh SEE ALSO
140.Xr crypto 3 ,
141.Xr ERR_asprintf_error_data 3 ,
142.Xr ERR_clear_error 3 ,
143.Xr ERR_error_string 3 ,
144.Xr ERR_get_error 3 ,
145.Xr ERR_GET_LIB 3 ,
146.Xr ERR_load_crypto_strings 3 ,
147.Xr ERR_load_strings 3 ,
148.Xr ERR_print_errors 3 ,
149.Xr ERR_put_error 3 ,
150.Xr ERR_remove_state 3 ,
151.Xr ERR_set_mark 3 ,
152.Xr SSL_get_error 3
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