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package sys
import (
"io"
"io/fs"
"os"
)
// UnwrapOSError returns an Errno or zero if the input is nil.
func UnwrapOSError(err error) Errno {
if err == nil {
return 0
}
err = underlyingError(err)
switch err {
case nil, io.EOF:
return 0 // EOF is not a Errno
case fs.ErrInvalid:
return EINVAL
case fs.ErrPermission:
return EPERM
case fs.ErrExist:
return EEXIST
case fs.ErrNotExist:
return ENOENT
case fs.ErrClosed:
return EBADF
}
return errorToErrno(err)
}
// underlyingError returns the underlying error if a well-known OS error type.
//
// This impl is basically the same as os.underlyingError in os/error.go
func underlyingError(err error) error {
switch err := err.(type) {
case *os.PathError:
return err.Err
case *os.LinkError:
return err.Err
case *os.SyscallError:
return err.Err
}
return err
}
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