zmq_msg_init_size - initialise 0MQ message of a specified size

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0MQ 4.3.5                                          03/31/2024                               ZMQ_MSG_INIT_SIZE(3)

       The zmq_msg_init_size() function shall allocate any resources required to store a message size bytes long
       and initialise the message object referenced by msg to represent the newly allocated message.

       The implementation shall choose whether to store message content on the stack (small messages) or on the
       heap (large messages). For performance reasons zmq_msg_init_size() shall not clear the message data.

           Caution

           Never access zmq_msg_t members directly, instead always use the zmq_msg family of functions.

           Caution

           The functions zmq_msg_init(), zmq_msg_init_data(), zmq_msg_init_size() and zmq_msg_init_buffer() are
           mutually exclusive. Never initialise the same zmq_msg_t twice.

ENOMEM
           Insufficient storage space is available.

       zmq_msg_init_size - initialise 0MQ message of a specified size

       The zmq_msg_init_size() function shall return zero if successful. Otherwise it shall return -1 and set
       errno to one of the values defined below.

zmq_msg_init_data(3) zmq_msg_init_buffer(3) zmq_msg_init(3) zmq_msg_close(3) zmq_msg_data(3)
       zmq_msg_size(3) zmq(7)

intzmq_msg_init_size(zmq_msg_t*msg,size_tsize);