3 =for openssl foreign manual errno(3)
7 ERR_raise, ERR_raise_data,
8 ERR_put_error, ERR_add_error_data, ERR_add_error_vdata,
9 ERR_add_error_txt, ERR_add_error_mem_bio
14 #include <openssl/err.h>
16 void ERR_raise(int lib, int reason);
17 void ERR_raise_data(int lib, int reason, const char *fmt, ...);
19 void ERR_add_error_data(int num, ...);
20 void ERR_add_error_vdata(int num, va_list arg);
21 void ERR_add_error_txt(const char *sep, const char *txt);
22 void ERR_add_error_mem_bio(const char *sep, BIO *bio);
24 The following function has been deprecated since OpenSSL 3.0, and can be
25 hidden entirely by defining B<OPENSSL_API_COMPAT> with a suitable version value,
26 see L<openssl_user_macros(7)>:
28 void ERR_put_error(int lib, int func, int reason, const char *file, int line);
32 ERR_raise() adds a new error to the thread's error queue. The
33 error occurred in the library B<lib> for the reason given by the
34 B<reason> code. Furthermore, the name of the file, the line, and name
35 of the function where the error occurred is saved with the error
38 ERR_raise_data() does the same thing as ERR_raise(), but also lets the
39 caller specify additional information as a format string B<fmt> and an
40 arbitrary number of values, which are processed with L<BIO_snprintf(3)>.
42 ERR_put_error() adds an error code to the thread's error queue. It
43 signals that the error of reason code B<reason> occurred in function
44 B<func> of library B<lib>, in line number B<line> of B<file>.
45 This function is usually called by a macro.
47 ERR_add_error_data() associates the concatenation of its B<num> string
48 arguments as additional data with the error code added last.
49 ERR_add_error_vdata() is similar except the argument is a B<va_list>.
50 Multiple calls to these functions append to the current top of the error queue.
51 The total length of the string data per error is limited to 4096 characters.
53 ERR_add_error_txt() appends the given text string as additional data to the
54 last error queue entry, after inserting the optional separator string if it is
55 not NULL and the top error entry does not yet have additional data.
56 In case the separator is at the end of the text it is not appended to the data.
57 The B<sep> argument may be for instance "\n" to insert a line break when needed.
58 If the associated data would become more than 4096 characters long
59 (which is the limit given above)
60 it is split over sufficiently many new copies of the last error queue entry.
62 ERR_add_error_mem_bio() is the same as ERR_add_error_txt() except that
63 the text string is taken from the given memory BIO.
64 It appends '\0' to the BIO contents if not already NUL-terminated.
66 L<ERR_load_strings(3)> can be used to register
67 error strings so that the application can a generate human-readable
68 error messages for the error code.
70 =head2 Reporting errors
72 =head3 OpenSSL library reports
74 Each OpenSSL sub-library has library code B<ERR_LIB_XXX> and has its own set
75 of reason codes B<XXX_R_...>. These are both passed in combination to
76 ERR_raise() and ERR_raise_data(), and the combination ultimately produces
77 the correct error text for the reported error.
79 All these macros and the numbers they have as values are specific to
80 OpenSSL's libraries. OpenSSL reason codes normally consist of textual error
81 descriptions. For example, the function ssl3_read_bytes() reports a
82 "handshake failure" as follows:
84 ERR_raise(ERR_LIB_SSL, SSL_R_SSL_HANDSHAKE_FAILURE);
86 There are two exceptions:
92 This "library code" indicates that a system error is being reported. In
93 this case, the reason code given to ERR_raise() and ERR_raise_data() I<must>
96 ERR_raise(ERR_LIB_SYS, errno);
100 This set of error codes is considered global, and may be used in combination
101 with any sub-library code.
103 ERR_raise(ERR_LIB_RSA, ERR_R_PASSED_INVALID_ARGUMENT);
107 =head3 Other pieces of software
109 Other pieces of software that may want to use OpenSSL's error reporting
110 system, such as engines or applications, must normally get their own
117 To get a "library" code, call L<ERR_get_next_error_library(3)>; this gives
118 the calling code a dynamic number, usable for the duration of the process.
122 Reason codes for each such "library" are determined or generated by the
123 authors of that code. They must be numbers in the range 1 to 524287 (in
124 other words, they must be nonzero unsigned 18 bit integers).
128 The exceptions mentioned in L</OpenSSL library reports> above are valid for
129 other pieces of software, i.e. they may use B<ERR_LIB_SYS> to report system
132 ERR_raise(ERR_LIB_SYS, errno);
134 ... and they may use B<ERR_R_XXX> macros together with their own "library"
137 int app_lib_code = ERR_get_next_error_library();
141 ERR_raise(app_lib_code, ERR_R_PASSED_INVALID_ARGUMENT);
145 [These are OpenSSL specific recommendations]
147 Reason codes should consist of uppercase characters, numbers and underscores
148 only. The error file generation script translates the trailing section of a
149 reason code (after the "_R_") into lowercase with underscores changed to
152 Although a library will normally report errors using its own specific
153 B<ERR_LIB_XXX> macro, another library's macro can be used, together with
154 that other library's reason codes. This is normally only done when a library
155 wants to include ASN1 code which must be combined with B<ERR_LIB_ASN1>
162 ERR_raise(), ERR_raise_data(), ERR_put_error(),
163 ERR_add_error_data(), ERR_add_error_vdata()
164 ERR_add_error_txt(), and ERR_add_error_mem_bio()
169 ERR_raise(), ERR_raise() and ERR_put_error() are implemented as macros.
173 L<ERR_load_strings(3)>, L<ERR_get_next_error_library(3)>
177 ERR_raise, ERR_raise_data, ERR_add_error_txt() and ERR_add_error_mem_bio()
178 were added in OpenSSL 3.0.
182 Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.
184 Licensed under the Apache License 2.0 (the "License"). You may not use
185 this file except in compliance with the License. You can obtain a copy
186 in the file LICENSE in the source distribution or at
187 L<https://www.openssl.org/source/license.html>.