---
name: "struct_usb_sg_request"
section: "9"
platform: "linux"
package: "linux-manual-4.9"
version: "4.9.228-1"
release: "Debian 9 (Stretch)"
platforms: ["linux"]
url: "https://new.carta.tech/struct_usb_sg_request"
---

# struct\_usb\_sg\_request(9)

support for scatter/gather I/O

## NAME

struct\_usb\_sg\_request - support for scatter/gather I/O

## SYNOPSIS

```
struct usb_sg_request {
  int status;
  size_t bytes;
};
```

## MEMBERS

status

zero indicates success, else negative errno

bytes

counts bytes transferred.

## DESCRIPTION

These requests are initialized using **usb\_sg\_init**, and then are used as request handles passed to **usb\_sg\_wait** or **usb\_sg\_cancel**. Most members of the request object aren't for driver access.

The status and bytecount values are valid only after **usb\_sg\_wait** returns. If the status is zero, then the bytecount matches the total from the request.

After an error completion, drivers may need to clear a halt condition on the endpoint.

## COPYRIGHT