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.\" ========================================================================
.\"
.IX Title "ERR_GET_ERROR 3ossl"
.TH ERR_GET_ERROR 3ossl "2024-09-03" "3.1.7+quic" "OpenSSL"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
ERR_get_error, ERR_peek_error, ERR_peek_last_error,
ERR_get_error_line, ERR_peek_error_line, ERR_peek_last_error_line,
ERR_peek_error_func, ERR_peek_last_error_func,
ERR_peek_error_data, ERR_peek_last_error_data,
ERR_get_error_all, ERR_peek_error_all, ERR_peek_last_error_all,
ERR_get_error_line_data, ERR_peek_error_line_data, ERR_peek_last_error_line_data
\&\- obtain error code and data
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/err.h>
\&
\& unsigned long ERR_get_error(void);
\& unsigned long ERR_peek_error(void);
\& unsigned long ERR_peek_last_error(void);
\&
\& unsigned long ERR_peek_error_line(const char **file, int *line);
\& unsigned long ERR_peek_last_error_line(const char **file, int *line);
\&
\& unsigned long ERR_peek_error_func(const char **func);
\& unsigned long ERR_peek_last_error_func(const char **func);
\&
\& unsigned long ERR_peek_error_data(const char **data, int *flags);
\& unsigned long ERR_peek_last_error_data(const char **data, int *flags);
\&
\& unsigned long ERR_get_error_all(const char **file, int *line,
\& const char **func,
\& const char **data, int *flags);
\& unsigned long ERR_peek_error_all(const char **file, int *line,
\& const char **func,
\& const char **data, int *flags);
\& unsigned long ERR_peek_last_error_all(const char **file, int *line,
\& const char *func,
\& const char **data, int *flags);
.Ve
.PP
The following functions have been deprecated since OpenSSL 3.0, and can be
hidden entirely by defining \fB\s-1OPENSSL_API_COMPAT\s0\fR with a suitable version value,
see \fBopenssl_user_macros\fR\|(7):
.PP
.Vb 7
\& unsigned long ERR_get_error_line(const char **file, int *line);
\& unsigned long ERR_get_error_line_data(const char **file, int *line,
\& const char **data, int *flags);
\& unsigned long ERR_peek_error_line_data(const char **file, int *line,
\& const char **data, int *flags);
\& unsigned long ERR_peek_last_error_line_data(const char **file, int *line,
\& const char **data, int *flags);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBERR_get_error()\fR returns the earliest error code from the thread's error
queue and removes the entry. This function can be called repeatedly
until there are no more error codes to return.
.PP
\&\fBERR_peek_error()\fR returns the earliest error code from the thread's
error queue without modifying it.
.PP
\&\fBERR_peek_last_error()\fR returns the latest error code from the thread's
error queue without modifying it.
.PP
See \s-1\fBERR_GET_LIB\s0\fR\|(3) for obtaining further specific information
such as the reason of the error,
and \fBERR_error_string\fR\|(3) for human-readable error messages.
.PP
\&\fBERR_get_error_all()\fR is the same as \fBERR_get_error()\fR, but on success it
additionally stores the filename, line number and function where the error
occurred in *\fIfile\fR, *\fIline\fR and *\fIfunc\fR, and also extra text and flags
in *\fIdata\fR, *\fIflags\fR. If any of those parameters are \s-1NULL,\s0 it will not
be changed.
An unset filename is indicated as "\*(L", i.e. an empty string.
An unset line number is indicated as 0.
An unset function name is indicated as \*(R"", i.e. an empty string.
.PP
A pointer returned this way by these functions and the ones below
is valid until the respective entry is overwritten in the error queue.
.PP
\&\fBERR_peek_error_line()\fR and \fBERR_peek_last_error_line()\fR are the same as
\&\fBERR_peek_error()\fR and \fBERR_peek_last_error()\fR, but on success they additionally
store the filename and line number where the error occurred in *\fIfile\fR and
*\fIline\fR, as far as they are not \s-1NULL.\s0
An unset filename is indicated as "", i.e., an empty string.
An unset line number is indicated as 0.
.PP
\&\fBERR_peek_error_func()\fR and \fBERR_peek_last_error_func()\fR are the same as
\&\fBERR_peek_error()\fR and \fBERR_peek_last_error()\fR, but on success they additionally
store the name of the function where the error occurred in *\fIfunc\fR, unless
it is \s-1NULL.\s0
An unset function name is indicated as "".
.PP
\&\fBERR_peek_error_data()\fR and \fBERR_peek_last_error_data()\fR are the same as
\&\fBERR_peek_error()\fR and \fBERR_peek_last_error()\fR, but on success they additionally
store additional data and flags associated with the error code in *\fIdata\fR
and *\fIflags\fR, as far as they are not \s-1NULL.\s0
Unset data is indicated as "".
In this case the value given for the flag is irrelevant (and equals 0).
*\fIdata\fR contains a string if *\fIflags\fR&\fB\s-1ERR_TXT_STRING\s0\fR is true.
.PP
\&\fBERR_peek_error_all()\fR and \fBERR_peek_last_error_all()\fR are combinations of all
of the above.
.PP
\&\fBERR_get_error_line()\fR, \fBERR_get_error_line_data()\fR, \fBERR_peek_error_line_data()\fR
and \fBERR_peek_last_error_line_data()\fR are older variants of \fBERR_get_error_all()\fR,
\&\fBERR_peek_error_all()\fR and \fBERR_peek_last_error_all()\fR, and may give confusing
results. They should no longer be used and are therefore deprecated.
.PP
An application \fB\s-1MUST NOT\s0\fR free the *\fIdata\fR pointer (or any other pointers
returned by these functions) with \fBOPENSSL_free()\fR as freeing is handled
automatically by the error library.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
The error code, or 0 if there is no error in the queue.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBERR_error_string\fR\|(3),
\&\s-1\fBERR_GET_LIB\s0\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
\&\fBERR_peek_error_func()\fR, \fBERR_peek_last_error_func()\fR,
\&\fBERR_peek_error_data()\fR, \fBERR_peek_last_error_data()\fR,
\&\fBERR_peek_error_all()\fR and \fBERR_peek_last_error_all()\fR
were added in OpenSSL 3.0.
.PP
\&\fBERR_get_error_line()\fR, \fBERR_get_error_line_data()\fR, \fBERR_peek_error_line_data()\fR
and \fBERR_peek_last_error_line_data()\fR became deprecated in OpenSSL 3.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2000\-2022 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.
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