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 Deprecated since OpenSSL 3.0:
26 void ERR_put_error(int lib, int func, int reason, const char *file, int line);
30 ERR_raise() adds a new error to the thread's error queue. The
31 error occurred in the library B<lib> for the reason given by the
32 B<reason> code. Furthermore, the name of the file, the line, and name
33 of the function where the error occurred is saved with the error
36 ERR_raise_data() does the same thing as ERR_raise(), but also lets the
37 caller specify additional information as a format string B<fmt> and an
38 arbitrary number of values, which are processed with L<BIO_snprintf(3)>.
40 ERR_put_error() adds an error code to the thread's error queue. It
41 signals that the error of reason code B<reason> occurred in function
42 B<func> of library B<lib>, in line number B<line> of B<file>.
43 This function is usually called by a macro.
45 ERR_add_error_data() associates the concatenation of its B<num> string
46 arguments as additional data with the error code added last.
47 ERR_add_error_vdata() is similar except the argument is a B<va_list>.
48 Multiple calls to these functions append to the current top of the error queue.
49 The total length of the string data per error is limited to 4096 characters.
51 ERR_add_error_txt() appends the given text string as additional data to the
52 last error queue entry, after inserting the optional separator string if it is
53 not NULL and the top error entry does not yet have additional data.
54 In case the separator is at the end of the text it is not appended to the data.
55 The B<sep> argument may be for instance "\n" to insert a line break when needed.
56 If the associated data would become more than 4096 characters long
57 (which is the limit given above)
58 it is split over sufficiently many new copies of the last error queue entry.
60 ERR_add_error_mem_bio() is the same as ERR_add_error_txt() except that
61 the text string is taken from the given memory BIO.
62 It appends '\0' to the BIO contents if not already NUL-terminated.
64 L<ERR_load_strings(3)> can be used to register
65 error strings so that the application can a generate human-readable
66 error messages for the error code.
68 =head2 Reporting errors
70 =head3 OpenSSL library reports
72 Each OpenSSL sub-library has library code B<ERR_LIB_XXX> and has its own set
73 of reason codes B<XXX_R_...>. These are both passed in combination to
74 ERR_raise() and ERR_raise_data(), and the combination ultimately produces
75 the correct error text for the reported error.
77 All these macros and the numbers they have as values are specific to
78 OpenSSL's libraries. OpenSSL reason codes normally consist of textual error
79 descriptions. For example, the function ssl3_read_bytes() reports a
80 "handshake failure" as follows:
82 ERR_raise(ERR_LIB_SSL, SSL_R_SSL_HANDSHAKE_FAILURE);
84 There are two exceptions:
90 This "library code" indicates that a system error is being reported. In
91 this case, the reason code given to ERR_raise() and ERR_raise_data() I<must>
94 ERR_raise(ERR_LIB_SYS, errno);
98 This set of error codes is considered global, and may be used in combination
99 with any sub-library code.
101 ERR_raise(ERR_LIB_RSA, ERR_R_PASSED_INVALID_ARGUMENT);
105 =head3 Other pieces of software
107 Other pieces of software that may want to use OpenSSL's error reporting
108 system, such as engines or applications, must normally get their own
115 To get a "library" code, call L<ERR_get_next_error_library(3)>; this gives
116 the calling code a dynamic number, usable for the duration of the process.
120 Reason codes for each such "library" are determined or generated by the
121 authors of that code. They must be numbers in the range 1 to 524287 (in
122 other words, they must be nonzero unsigned 18 bit integers).
126 The exceptions mentioned in L</OpenSSL library reports> above are valid for
127 other pieces of software, i.e. they may use B<ERR_LIB_SYS> to report system
130 ERR_raise(ERR_LIB_SYS, errno);
132 ... and they may use B<ERR_R_XXX> macros together with their own "library"
135 int app_lib_code = ERR_get_next_error_library();
139 ERR_raise(app_lib_code, ERR_R_PASSED_INVALID_ARGUMENT);
143 [These are OpenSSL specific recommendations]
145 Reason codes should consist of uppercase characters, numbers and underscores
146 only. The error file generation script translates the trailing section of a
147 reason code (after the "_R_") into lowercase with underscores changed to
150 Although a library will normally report errors using its own specific
151 B<ERR_LIB_XXX> macro, another library's macro can be used, together with
152 that other library's reason codes. This is normally only done when a library
153 wants to include ASN1 code which must be combined with B<ERR_LIB_ASN1>
160 ERR_raise(), ERR_raise_data(), ERR_put_error(),
161 ERR_add_error_data(), ERR_add_error_vdata()
162 ERR_add_error_txt(), and ERR_add_error_mem_bio()
167 ERR_raise(), ERR_raise() and ERR_put_error() are implemented as macros.
171 L<ERR_load_strings(3)>, L<ERR_get_next_error_library(3)>
175 ERR_raise, ERR_raise_data, ERR_add_error_txt() and ERR_add_error_mem_bio()
176 were added in OpenSSL 3.0.
180 Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.
182 Licensed under the Apache License 2.0 (the "License"). You may not use
183 this file except in compliance with the License. You can obtain a copy
184 in the file LICENSE in the source distribution or at
185 L<https://www.openssl.org/source/license.html>.