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## nng_socket_pair
Create a connected pair of BSD sockets.
### Synopsis
```c
#include <nng/nng.h>
#include <nng/supplemental/util/platform.h>
int nng_socket_pair(int fds[2]);
```
### Description
The `nng_socket_pair` function creates a pair of connected BSD sockets.
These sockets, which are returned in the _fds_ array, are suitable for use with the xref:../tran/socket.adoc[_socket_] transport.
On POSIX platforms, this is a thin wrapper around the standard `socketpair` function, using the `AF_UNIX` family and the `SOCK_STREAM` socket type.
NOTE: At present only POSIX platforms implementing `socketpair` are supported with this function.
TIP: This function may be useful for creating a shared connection between a parent process and a child process on UNIX platforms, without requiring the processes use a shared filesystem or TCP connection.
### Return Values
This function returns 0 on success, and non-zero otherwise.
### Errors
[horizontal]
`NNG_ENOMEM`:: Insufficient memory exists.
`NNG_ENOTSUP`:: This platform does not support socket pairs.
### See Also
xref:../tran/socket.adoc[BSD Socket Transport]
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