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## nn_device
Create forwarding device (compatible API).
### Synopsis
[source,c]
```
#include <nanomsg/nn.h>
int nn_device(int sock1, int sock2);
```
### Description
The `nn_device` function is used to create a forwarder, where messages received on one of the two sockets _sock1_ and _sock2_ are forwarded to the other.
The two sockets must be compatible, and must be raw mode sockets.
### Return Values
This function blocks forever, and will return -1 only when one of the sockets is closed or an error occurs.
### Errors
[horizontal]
`EBADF`:: One of the two sockets is invalid or not open, or has
`EINVAL`:: The sockets are not compatible with each other, or not both raw.
`ENOMEM`:: Insufficient memory is available.
### See Also
xref:nn_errno.adoc[nn_errno],
xref:nn_socket.adoc[nn_socket]
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