CancelRequest
CancelRequest is a frontend protocol message. Length of message contents in bytes, including self.
当前阅读 PG 18·选择有来源记录的版本
此版本暂无所选语言的定义，以下显示原始英文内容。
- Direction
- Frontend → backend
- First wire field
- Int32
- Field entries
- 4
- Documented flow contexts
- Canceling Requests in Progress; SSL Session Encryption; GSSAPI Session Encryption
- direction
- F
- manual path
- /docs/18/protocol-message-formats.html
- signature
- CancelRequest (F)
版本定义 PG 18
-
- Int32
-
Length of message contents in bytes, including self.
- Int32(80877102)
-
The cancel request code. The value is chosen to contain
1234in the most significant 16 bits, and5678in the least significant 16 bits. (To avoid confusion, this code must not be the same as any protocol version number.) - Int32
-
The process ID of the target backend.
- Byte
n -
The secret key for the target backend. This field extends to the end of the message, indicated by the length field. The maximum key length is 256 bytes.
Before protocol version 3.2, the secret key was always 4 bytes long.
Wire fields in documented order
| Position | Format | Meaning |
|---|---|---|
| 1 | Int32 | Length of message contents in bytes, including self. |
| 2 | Int32(80877102) | The cancel request code. The value is chosen to contain 1234 in the most significant 16 bits, and 5678 in the least significant 16 bits. (To avoid confusion, this code must not be the same as any protocol version number.) |
| 3 | Int32 | The process ID of the target backend. |
| 4 | Byte n | The secret key for the target backend. This field extends to the end of the message, indicated by the length field. The maximum key length is 256 bytes. |
比较版本
完整来源事实
fields
map[description:Length of message contents in bytes, including self. format:Int32], map[description:The cancel request code. The value is chosen to contain 1234 in the most significant 16 bits, and 5678 in the least significant 16 bits. (To avoid confusion, this code must not be the same as any protocol version number.) format:Int32(80877102)], map[description:The process ID of the target backend. format:Int32], map[description:The secret key for the target backend. This field extends to the end of the message, indicated by the length field. The maximum key length is 256 bytes. format:Byte n]
来源引用
定义来源
center · PostgreSQL 18 · 555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f
正文语言: en · 555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f