'\" t
.\"     Title: tlsrpt_errno_from_error_code
.\"    Author: Boris Lohner
.\" Generator: Asciidoctor 2.0.26
.\"      Date: 2026-09-01
.\"    Manual: tlsrpt_errno_from_error_code
.\"    Source: tlsrpt_errno_from_error_code
.\"  Language: English
.\"
.TH "TLSRPT_ERRNO_FROM_ERROR_CODE" "3" "2026-09-01" "tlsrpt_errno_from_error_code" "tlsrpt_errno_from_error_code"
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.SH "NAME"
tlsrpt_errno_from_error_code \- returns the `errno` part of an errorcode
.SH "SYNOPSIS"
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#include <tlsrpt.h>
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int tlsrpt_errno_from_error_code(int errorcode)
.SH "DESCRIPTION"
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The \f(CRtlsrpt_errno_from_error_code\fP function returns the \f(CRerrno\fP part of an errorcode.
In case of internal library errors from the TLSRPT_ERR_TLSRPT block the returned value will be a high number to avoid clashes with existing errno values.
I.e. \f(CRTLSRPT_ERR_TLSRPT_NESTEDPOLICY\fP is 10731 instead of 10031 to avoid the errno part being decoded as \f(CREMLINK\fP.
.SH "RETURN VALUE"
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The tlsrpt_errno_from_error_code function returns 0 on success and a combined error code on failure.
The combined error code can be analyzed with the \fItlsrpt_strerror\fP function.
.SH "SEE ALSO"
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man:tlsrpt_error_code_is_internal[3], man:tlsrpt_strerror[3]
.SH "AUTHOR"
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Boris Lohner