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## nn_close
Close socket (compatible API).
### Synopsis
[source,c]
```
#include <nanomsg/nn.h>
int nn_close(int sock);
```
### Description
The `nn_close` function closes the socket _sock_.
Any operations that are currently in progress will be terminated, and will fail with error `EBADF`.
### Return Values
This function returns zero on success, and -1 on failure.
### Errors
[horizontal]
`EBADF`:: The socket is not open.
`ETERM`:: The library is shutting down.
### See Also
xref:nn_errno.adoc[nn_errno],
xref:nn_socket.adoc[nn_socket]
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