1=pod 2 3=head1 NAME 4 5ERR_error_string, ERR_error_string_n, ERR_lib_error_string, 6ERR_func_error_string, ERR_reason_error_string - obtain human-readable 7error message 8 9=head1 SYNOPSIS 10 11 #include <openssl/err.h> 12 13 char *ERR_error_string(unsigned long e, char *buf); 14 void ERR_error_string_n(unsigned long e, char *buf, size_t len); 15 16 const char *ERR_lib_error_string(unsigned long e); 17 const char *ERR_reason_error_string(unsigned long e); 18 19Deprecated in OpenSSL 3.0: 20 21 const char *ERR_func_error_string(unsigned long e); 22 23=head1 DESCRIPTION 24 25ERR_error_string() generates a human-readable string representing the 26error code I<e>, and places it at I<buf>. I<buf> must be at least 256 27bytes long. If I<buf> is B<NULL>, the error string is placed in a 28static buffer. 29Note that this function is not thread-safe and does no checks on the size 30of the buffer; use ERR_error_string_n() instead. 31 32ERR_error_string_n() is a variant of ERR_error_string() that writes 33at most I<len> characters (including the terminating 0) 34and truncates the string if necessary. 35For ERR_error_string_n(), I<buf> may not be B<NULL>. 36 37The string will have the following format: 38 39 error:[error code]:[library name]::[reason string] 40 41I<error code> is an 8 digit hexadecimal number, I<library name> and 42I<reason string> are ASCII text. 43 44ERR_lib_error_string() and ERR_reason_error_string() return the library 45name and reason string respectively. 46 47If there is no text string registered for the given error code, 48the error string will contain the numeric code. 49 50L<ERR_print_errors(3)> can be used to print 51all error codes currently in the queue. 52 53=head1 RETURN VALUES 54 55ERR_error_string() returns a pointer to a static buffer containing the 56string if I<buf> B<== NULL>, I<buf> otherwise. 57 58ERR_lib_error_string() and ERR_reason_error_string() return the strings, 59and B<NULL> if none is registered for the error code. 60 61ERR_func_error_string() returns NULL. 62 63=head1 SEE ALSO 64 65L<ERR_get_error(3)>, 66L<ERR_print_errors(3)> 67 68=head1 HISTORY 69 70ERR_func_error_string() became deprecated in OpenSSL 3.0. 71 72=head1 COPYRIGHT 73 74Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved. 75 76Licensed under the Apache License 2.0 (the "License"). You may not use 77this file except in compliance with the License. You can obtain a copy 78in the file LICENSE in the source distribution or at 79L<https://www.openssl.org/source/license.html>. 80 81=cut 82