SYNOPSIS
#include <nng/nng.h>
typedef struct nng_msg nng_msg;DESCRIPTION
An nng_msg represents a single message sent between Scalability Protocols
peers.
Messages internally have a body, containing the application supplied
payload, and a header, containing protocol specific routing and similar
related information.
| Using the message-oriented functions in the nng API is a good way to reduce the likelihood of data copies and improve application performance. |
Messages are allocated using the nng_msg_alloc()
function, and are deallocated using the nng_msg_free()
function.
In addition there are other functions used to access message contents, including adding data to either the beginning or end of the message, automatic data conversion, and removing data from the beginning or end. These functions are designed to try to avoid copying message contents by making use of scratch areas at the beginning and end of the message.
RETURN VALUES
This function returns 0 on success, and non-zero otherwise.
ERRORS
NNG_ENOMEM
|
Insufficient free memory exists to allocate a message. |