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## 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_.
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
xref:nng_msg_reserve.adoc[nng_msg_reserve],
xref:nng_msg_alloc.adoc[nng_msg_alloc],
xref:nng_msg_body.adoc[nng_msg_body]
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