int nn_freemsg (void *msg);
Deallocates a message allocated using nn_allocmsg(3) function or received via nn_recv(3) or nn_recvmsg(3) function. While nn_recv(3) and nn_recvmsg(3) allow to receive data into arbitrary buffers, using library-allocated buffers can be more efficient for large messages as it allows for using zero-copy techniques.
If the function succeeds zero is returned. Otherwise, -1 is returned and errno is set to to one of the values defined below.
The message pointer is invalid.
void *buf; nn_recv (s, &buf, NN_MSG, 0); nn_freemsg (buf);