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# nng_ctx_close
## NAME
nng_ctx_close --- close context
## SYNOPSIS
```c
#include <nng/nng.h>
int nng_ctx_close(nng_ctx ctx);
```
## DESCRIPTION
The `nng_ctx_close()` function closes the [context][context] _ctx_.
Messages that have been submitted for sending may be flushed or delivered,
depending upon the transport.
Further attempts to use the context after this call returns will result
in `NNG_ECLOSED`.
Threads waiting for operations on the context when this
call is executed may also return with an `NNG_ECLOSED` result.
> [!NOTE]
> Closing the socket associated with _ctx_
> (using [`nng_close()`][nng_close]) also closes this context.
## RETURN VALUES
This function returns 0 on success, and non-zero otherwise.
## ERRORS
- `NNG_ECLOSED`: The context _ctx_ is already closed or was never opened.
## SEE ALSO
[nng_close][nng_close],
[nng_ctx_open][nng_ctx_open]
{{#include ../refs.md}}
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