Tries to get the UNIX user identifier from @credentials. This
method is only available on UNIX platforms.
This operation can fail if #GCredentials is not supported on the
OS or if the native credentials type does not contain information
about the UNIX user.
Return: The UNIX user identifier or -1 if @error is set.
Tries to get the UNIX user identifier from @credentials. This method is only available on UNIX platforms.
This operation can fail if #GCredentials is not supported on the OS or if the native credentials type does not contain information about the UNIX user.
Return: The UNIX user identifier or -1 if @error is set.