# mariadb\_cancel

## Syntax

```c
int mariadb_cancel(MYSQL * mysql);
```

`mysql` - mysql handle, which was previously allocated by [mysql\_init()](/docs/connectors/mariadb-connector-c/api-functions/mysql_init.md) or [mysql\_real\_connect()](/docs/connectors/mariadb-connector-c/api-functions/mysql_real_connect.md).

## Description

Immediately aborts a connection by making all subsequent read/write operations fail.*mariadb\_cancel()* does not invalidate memory used for mysql structure, nor close any communication channels. To free the memory, [mysql\_close()](/docs/connectors/mariadb-connector-c/api-functions/mysql_close.md) must be called.*mariadb\_cancel()* is useful to break long queries in situations where sending KILL is not possible.

*mariadb\_cancel()* was added in Connector/C 3.0

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