[syserr.general]

# 19 Diagnostics library [[diagnostics]](./#diagnostics)

## 19.5 System error support [[syserr]](syserr#general)

### 19.5.1 General [syserr.general]

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/diagnostics.tex#L620)

Subclause [[syserr]](syserr "19.5 System error support") describes components that the standard library and
C++ programs may use to report error conditions originating from
the operating system or other low-level application program interfaces[.](#1.sentence-1)

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/diagnostics.tex#L625)

Components described in [[syserr]](syserr "19.5 System error support") do not change the value oferrno ([[errno]](errno "19.4 Error numbers"))[.](#2.sentence-1)

*Recommended practice*: Implementations should leave the error states provided by other
libraries unchanged[.](#2.sentence-2)