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.\" ========================================================================
.\"
.IX Title "ERR_GET_ERROR 3"
.TH ERR_GET_ERROR 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
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.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_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_get_error_line(const char **file, int *line);
\& 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_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 information about
location and reason of the error, and
\&\fBERR_error_string\fR\|(3) for human-readable error
messages.
.PP
\&\fBERR_get_error_line()\fR, \fBERR_peek_error_line()\fR and
\&\fBERR_peek_last_error_line()\fR are the same as the above, but they
additionally store the filename and line number where
the error occurred in *\fBfile\fR and *\fBline\fR, unless these are \fB\s-1NULL\s0\fR.
.PP
\&\fBERR_get_error_line_data()\fR, \fBERR_peek_error_line_data()\fR and
\&\fBERR_peek_last_error_line_data()\fR store additional data and flags
associated with the error code in *\fBdata\fR
and *\fBflags\fR, unless these are \fB\s-1NULL\s0\fR. *\fBdata\fR contains a string
if *\fBflags\fR&\fB\s-1ERR_TXT_STRING\s0\fR is true.
.PP
An application \fB\s-1MUST NOT\s0\fR free the *\fBdata\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 "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2000\-2020 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (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>.