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This documentation is for version v1.2.2 of nng, but the latest released version is v1.3.2. see the documentation for v1.3.2 for the most up-to-date information.
nng_msg_realloc(3)

SYNOPSIS

#include <nng/nng.h>

int nng_msg_realloc(nng_msg *msg, size_t size);

DESCRIPTION

The nng_msg_realloc() function re-allocates a message so that it has a body of length size. This message attempts to avoid extra allocations, and will reuse the existing memory when possible.

One way to further reduce message allocations is to allocate a message larger than needed, then use this function or nng_msg_chop() to reduce the message size to that actually needed. The extra space left over will still be present in the message, so that when the message size needs to grow due to this function or nng_msg_append() no actual memory allocations need to take place.
Pointers to message body and header content obtained prior to this function must not be in use, as the underlying memory used for the message may have changed, particularly if the message size is increasing.

RETURN VALUES

This function returns 0 on success, and non-zero otherwise.

ERRORS

NNG_ENOMEM

Insufficient free memory exists to reallocate a message.

NNG Reference Manual vv1.2.2 © 2019 Staysail Systems, Inc, © 2018 Capitar IT Group BV
This document is supplied under the MIT License.
nanomsg™ and nng™ are trademarks of Garrett D'Amore.