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19 Diagnostics library [diagnostics]

19.5 System error support [syserr]

19.5.1 General [syserr.general]

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Subclause [syserr] 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.
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Components described in [syserr] do not change the value of errno ([errno]).
Recommended practice: Implementations should leave the error states provided by other libraries unchanged.