NAME

       nng_msg_realloc - reallocate a message

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.

           Tip
           nng_msg_realloc is suitable for creating space for direct writing of data. When
           appending many small pieces of data to a message using nng_msg_append(), allocations
           may be reduced by first using nng_msg_reserve() to create sufficient space. In any
           case, reallocating or appending to a message is guaranteed to succeed if the resulting
           body length is less than nng_msg_capacity().

           Note
           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.

SEE ALSO

       nng_msg_reserve(3), nng_msg_alloc(3), nng_msg_append(3), nng_msg_body(3), nng_msg_chop(3),
       nng_msg_free(3), nng_msg_insert(3), nng_msg_len(3), nng_msg_trim(3), nng_strerror(3),
       nng_msg(5), nng(7)

                                            2024-10-11                         NNG_MSG_REALLOC(3)