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## nn_reallocmsg
Reallocate message (compatible API).
### Synopsis
```c
#include <nanomsg/nn.h>
void *nn_reallocmsg(void *old, size_t size);
```
### Description
The `nn_reallocmsg` reallocates the message _old_, making it of size _size_.
On success, the contents of _old_ are copied into the new message (truncating if appropriate), then _old_ is deallocated, and a pointer to the new message payload is returned.
On failure, the _old_ message is unchanged, and the value `NULL` is returnedto the caller.
### Return Values
This function returns a pointer to message buffer space, or `NULL` on failure.
### Errors
[horizontal]
`ENOMEM`:: Insufficient memory is available.
`EINVAL`:: An invalid _size_ was specified.
`ETERM`:: The library is shutting down.
### See Also
xref:nn_allocmsg.adoc[nn_allocmsg],
xref:nn_freemsg.adoc[nn_freemsg],
xref:nn_errno.adoc[nn_errno]
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