1=pod 2 3=head1 NAME 4 5ERR_get_error, ERR_peek_error, ERR_peek_last_error, 6ERR_get_error_line, ERR_peek_error_line, ERR_peek_last_error_line, 7ERR_peek_error_func, ERR_peek_last_error_func, 8ERR_peek_error_data, ERR_peek_last_error_data, 9ERR_get_error_all, ERR_peek_error_all, ERR_peek_last_error_all, 10ERR_get_error_line_data, ERR_peek_error_line_data, ERR_peek_last_error_line_data 11- obtain error code and data 12 13=head1 SYNOPSIS 14 15 #include <openssl/err.h> 16 17 unsigned long ERR_get_error(void); 18 unsigned long ERR_peek_error(void); 19 unsigned long ERR_peek_last_error(void); 20 21 unsigned long ERR_peek_error_line(const char **file, int *line); 22 unsigned long ERR_peek_last_error_line(const char **file, int *line); 23 24 unsigned long ERR_peek_error_func(const char **func); 25 unsigned long ERR_peek_last_error_func(const char **func); 26 27 unsigned long ERR_peek_error_data(const char **data, int *flags); 28 unsigned long ERR_peek_last_error_data(const char **data, int *flags); 29 30 unsigned long ERR_get_error_all(const char **file, int *line, 31 const char **func, 32 const char **data, int *flags); 33 unsigned long ERR_peek_error_all(const char **file, int *line, 34 const char **func, 35 const char **data, int *flags); 36 unsigned long ERR_peek_last_error_all(const char **file, int *line, 37 const char *func, 38 const char **data, int *flags); 39 40The following functions have been deprecated since OpenSSL 3.0, and can be 41hidden entirely by defining B<OPENSSL_API_COMPAT> with a suitable version value, 42see L<openssl_user_macros(7)>: 43 44 unsigned long ERR_get_error_line(const char **file, int *line); 45 unsigned long ERR_get_error_line_data(const char **file, int *line, 46 const char **data, int *flags); 47 unsigned long ERR_peek_error_line_data(const char **file, int *line, 48 const char **data, int *flags); 49 unsigned long ERR_peek_last_error_line_data(const char **file, int *line, 50 const char **data, int *flags); 51 52=head1 DESCRIPTION 53 54ERR_get_error() returns the earliest error code from the thread's error 55queue and removes the entry. This function can be called repeatedly 56until there are no more error codes to return. 57 58ERR_peek_error() returns the earliest error code from the thread's 59error queue without modifying it. 60 61ERR_peek_last_error() returns the latest error code from the thread's 62error queue without modifying it. 63 64See L<ERR_GET_LIB(3)> for obtaining further specific information 65such as the reason of the error, 66and L<ERR_error_string(3)> for human-readable error messages. 67 68ERR_get_error_all() is the same as ERR_get_error(), but on success it 69additionally stores the filename, line number and function where the error 70occurred in *I<file>, *I<line> and *I<func>, and also extra text and flags 71in *I<data>, *I<flags>. If any of those parameters are NULL, it will not 72be changed. 73An unset filename is indicated as "", i.e. an empty string. 74An unset line number is indicated as 0. 75An unset function name is indicated as "", i.e. an empty string. 76 77A pointer returned this way by these functions and the ones below 78is valid until the respective entry is overwritten in the error queue. 79 80ERR_peek_error_line() and ERR_peek_last_error_line() are the same as 81ERR_peek_error() and ERR_peek_last_error(), but on success they additionally 82store the filename and line number where the error occurred in *I<file> and 83*I<line>, as far as they are not NULL. 84An unset filename is indicated as "", i.e., an empty string. 85An unset line number is indicated as 0. 86 87ERR_peek_error_func() and ERR_peek_last_error_func() are the same as 88ERR_peek_error() and ERR_peek_last_error(), but on success they additionally 89store the name of the function where the error occurred in *I<func>, unless 90it is NULL. 91An unset function name is indicated as "". 92 93ERR_peek_error_data() and ERR_peek_last_error_data() are the same as 94ERR_peek_error() and ERR_peek_last_error(), but on success they additionally 95store additional data and flags associated with the error code in *I<data> 96and *I<flags>, as far as they are not NULL. 97Unset data is indicated as "". 98In this case the value given for the flag is irrelevant (and equals 0). 99*I<data> contains a string if *I<flags>&B<ERR_TXT_STRING> is true. 100 101ERR_peek_error_all() and ERR_peek_last_error_all() are combinations of all 102of the above. 103 104ERR_get_error_line(), ERR_get_error_line_data(), ERR_peek_error_line_data() 105and ERR_peek_last_error_line_data() are older variants of ERR_get_error_all(), 106ERR_peek_error_all() and ERR_peek_last_error_all(), and may give confusing 107results. They should no longer be used and are therefore deprecated. 108 109An application B<MUST NOT> free the *I<data> pointer (or any other pointers 110returned by these functions) with OPENSSL_free() as freeing is handled 111automatically by the error library. 112 113=head1 RETURN VALUES 114 115The error code, or 0 if there is no error in the queue. 116 117=head1 SEE ALSO 118 119L<ERR_error_string(3)>, 120L<ERR_GET_LIB(3)> 121 122=head1 HISTORY 123 124ERR_peek_error_func(), ERR_peek_last_error_func(), 125ERR_peek_error_data(), ERR_peek_last_error_data(), 126ERR_peek_error_all() and ERR_peek_last_error_all() 127were added in OpenSSL 3.0. 128 129ERR_get_error_line(), ERR_get_error_line_data(), ERR_peek_error_line_data() 130and ERR_peek_last_error_line_data() became deprecated in OpenSSL 3.0. 131 132 133=head1 COPYRIGHT 134 135Copyright 2000-2022 The OpenSSL Project Authors. All Rights Reserved. 136 137Licensed under the Apache License 2.0 (the "License"). You may not use 138this file except in compliance with the License. You can obtain a copy 139in the file LICENSE in the source distribution or at 140L<https://www.openssl.org/source/license.html>. 141 142=cut 143