Interface Errno

An Errno is an unsigned number describing an error condition. It implements the error interface. The zero Errno is by convention a non-error, so code to convert from Errno to error should use:

  err = nil
  if errno != 0 {
    err = errno
  }
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Errno values can be tested against error values using [errors.Is]. For example:

  _, _, err := syscall.Syscall(...)
  if errors.Is(err, fs.ErrNotExist) ...
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