Returns a string corresponding to the given error code, e.
g. "no such process". You should use this function in preference to strerror, because it returns a string in UTF-8 encoding,
and since not all platforms support the strerror function.
| errnum |
the system error number. See the standard C errno documentation |
|
a UTF-8 string describing the error code. If the error code is unknown, it returns "unknown error (<code>)". |