---
name: "struct_ccw1"
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_ccw1"
---

# struct\_ccw1(9)

channel command word

## NAME

struct\_ccw1 - channel command word

## SYNOPSIS

```
struct ccw1 {
  __u8 cmd_code;
  __u8 flags;
  __u16 count;
  __u32 cda;
};
```

## MEMBERS

cmd\_code

command code

flags

flags, like IDA addressing, etc.

count

byte count

cda

data address

## DESCRIPTION

The ccw is the basic structure to build channel programs that perform operations with the device or the control unit. Only Format-1 channel command words are supported.

## AUTHOR

**Cornelia Huck** \<cornelia.huck@de.ibm.com\>

Author.

## COPYRIGHT