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# nng_msg_capacity
## NAME
nng_msg_capacity --- return message body length
## SYNOPSIS
```c
#include <nng/nng.h>
size_t nng_msg_capacity(nng_msg *msg);
```
## DESCRIPTION
The `nng_msg_capacity()` returns the storage allocated for the body of [message][msg] _msg_.
The capacity includes the current contents of the message and free space after it.
The message body may grow to capacity without performing any further allocations.
## RETURN VALUES
Allocated capacity for message body.
## SEE ALSO
[nng_msg_alloc][nng_msg_alloc],
[nng_msg_realloc][nng_msg_realloc],
[nng_msg_reserve][nng_msg_reserve]
[nng_msg_body][nng_msg_body]
{{#include ../refs.md}}
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