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# nng_req_open
## NAME
nng_req_open --- create req socket
## SYNOPSIS
```c
#include <nng/nng.h>
#include <nng/protocol/reqrep0/req.h>
int nng_req0_open(nng_socket *s);
int nng_req0_open_raw(nng_socket *s);
```
## DESCRIPTION
The `nng_req0_open()` function creates a [{{i:*REQ*}}][req] version 0
[socket][socket] and returns it at the location pointed to by _s_.
The `nng_req0_open_raw()` function creates a _REQ_ version 0
socket in [raw mode][raw] and returns it at the location pointed to by _s_.
## RETURN VALUES
These functions return 0 on success, and non-zero otherwise.
## ERRORS
* `NNG_ENOMEM`: Insufficient memory is available.
* `NNG_ENOTSUP`: The protocol is not supported.
## SEE ALSO
[Sockets][socket],
[_REP_ Protocol][rep],
[_REQ_ Protocol][req]
{{#include ../refs.md}}
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