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## nng_pair_open
Create pair socket.
### Synopsis
.Version 0
```c
#include <nng/protocol/pair0/pair.h>
int nng_pair0_open(nng_socket *s);
int nng_pair0_open_raw(nng_socket *s);
```
.Version 1
```c
#include <nng/protocol/pair1/pair.h>
int nng_pair1_open(nng_socket *s);
int nng_pair1_open_raw(nng_socket *s);
int nng_pair1_open_poly(nng_socktet *s);
```
### Description
The `nng_pair0_open` and `nng_pair1_open` functions
create a xref:nng_pair.adoc[_PAIR_] version 0 or version 1 xref:../index.adoc[socket] and return it at the location pointed to by _s_.
The `nng_pair0_open_raw` and `nng_pair1_open_raw` functions create a _PAIR_ version 0 or version 1 socket in xref:../sock/raw.adoc[raw mode] and return it at the location pointed to by _s_.
The `nng_pair1_open_poly` function opens a pair version 1 socket in polyamorous mode.
NOTE: Polyamorous mode is deprecated.
### Return Values
These functions returns 0 on success, and non-zero otherwise.
### Errors
[horizontal]
`NNG_ENOMEM`:: Insufficient memory is available.
`NNG_ENOTSUP`:: The protocol is not supported.
### See Also
xref:../proto/pair.adoc[Pair Protocol (_PAIR_)]
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