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# nng_msg_dup
## NAME
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][msg] _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
- `NNG_ENOMEM`: Insufficient free memory exists to duplicate a message.
## SEE ALSO
[nng_msg_alloc][nng_msg_alloc],
[nng_msg_free][nng_msg_free]
{{#include ../refs.md}}
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