can be used to obtain the error message string for the error code.

Since

uses

as underlying function, calling

after

will make the return value from

invalid or overwritten.

always returns a pointer to a C string. The C string must not be overwritten by the calling program.

first appeared in the WIDE/KAME IPv6 protocol stack kit.

will return its result which may be overwritten by subsequent calls.

is not thread safe.

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