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## nng_msg_dup
Duplicate a message.
### Synopsis
```c
#include <nng/nng.h>
int nng_msg_dup(nng_msg **dup, nng_msg_t *orig);
```
### Description
The `nng_msg_dup` makes a duplicate of the original message _orig_, and saves the result in the location pointed by _dup_.
The actual message body and header content is copied, but the duplicate may contain a different amount of unused space than the original message.
### Return Values
This function returns 0 on success, and non-zero otherwise.
### Errors
[horizontal]
`NNG_ENOMEM`:: Insufficient free memory exists to duplicate a message.
### See Also
xref:nng_msg_alloc.adoc[nng_msg_alloc],
xref:nng_msg_free.adoc[nng_msg_free]
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