[#llvm-errnoAsErrorCode]
= xref:llvm.adoc[llvm]::errnoAsErrorCode
:relfileprefix: ../
:mrdocs:

Helper to get errno as an std::error_code.

== Synopsis

Declared in `<llvm/Support/Error.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::error_code
errnoAsErrorCode();
----

== Description

errno should always be represented using the generic category as that's what both libc++ and libstdc++ do. On POSIX systems you can also represent them using the system category, however this makes them compare differently for values outside of those used by `std::errc` if one is generic and the other is system.

See the libc++ and libstdc++ implementations of `default_error_condition` on the system category for more details on what the difference is.

== Return Value

A std::error_code for the current errno.


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