Gioio_error_from_errno

Converts errno.h error codes into GIO error codes.

The fallback value G_IO_ERROR_FAILED is returned for error codes not currently handled (but note that future GLib releases may return a more specific value instead).

As errno is global and may be modified by intermediate function calls, you should save its value immediately after the call returns, and use the saved value instead of errno:

  int saved_errno;

  ret = read (blah);
  saved_errno = errno;

  g_io_error_from_errno (saved_errno);