code: func (c *StorageGateway) UpdateGatewaySoftwareNow(input *UpdateGatewaySoftwareNowInput) (*UpdateGatewaySoftwareNowOutput, error) {
  	req, out := c.UpdateGatewaySoftwareNowRequest(input)
  	return out, req.Send()
  }
docs: // UpdateGatewaySoftwareNow API operation for AWS Storage Gateway.
  //
  // Updates the gateway virtual machine (VM) software. The request immediately
  // triggers the software update.
  //
  // When you make this request, you get a 200 OK success response immediately.
  // However, it might take some time for the update to complete. You can call
  // DescribeGatewayInformation to verify the gateway is in the STATE_RUNNING
  // state.
  //
  // A software update forces a system restart of your gateway. You can minimize
  // the chance of any disruption to your applications by increasing your iSCSI
  // Initiators' timeouts. For more information about increasing iSCSI Initiator
  // timeouts for Windows and Linux, see Customizing Your Windows iSCSI Settings
  // (https://docs.aws.amazon.com/storagegateway/latest/userguide/ConfiguringiSCSIClientInitiatorWindowsClient.html#CustomizeWindowsiSCSISettings)
  // and Customizing Your Linux iSCSI Settings (https://docs.aws.amazon.com/storagegateway/latest/userguide/ConfiguringiSCSIClientInitiatorRedHatClient.html#CustomizeLinuxiSCSISettings),
  // respectively.
  //
  // Returns awserr.Error for service API and SDK errors. Use runtime type assertions
  // with awserr.Error's Code and Message methods to get detailed information about
  // the error.
  //
  // See the AWS API reference guide for AWS Storage Gateway's
  // API operation UpdateGatewaySoftwareNow for usage and error information.
  //
  // Returned Error Codes:
  //   * ErrCodeInvalidGatewayRequestException "InvalidGatewayRequestException"
  //   An exception occurred because an invalid gateway request was issued to the
  //   service. For more information, see the error and message fields.
  //
  //   * ErrCodeInternalServerError "InternalServerError"
  //   An internal server error has occurred during the request. For more information,
  //   see the error and message fields.
  //
  // See also, https://docs.aws.amazon.com/goto/WebAPI/storagegateway-2013-06-30/UpdateGatewaySoftwareNow