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## 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 _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.
TIP: Closing the socket associated with _ctx_ also closes this context.
### Return Values
This function returns 0 on success, and non-zero otherwise.
### Errors
[horizontal]
`NNG_ECLOSED`:: The context _ctx_ is already closed or was never opened.
### See Also
xref:../sock/nng_close.adoc[nng_close],
xref:nng_ctx_open.adoc[nng_ctx_open]
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