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-# nng_msg
-
-## NAME
-
-nng_msg --- message
-
-## SYNOPSIS
-
-```c
-#include <nng/nng.h>
-
-typedef struct nng_msg nng_msg;
-
-int nng_msg_alloc(nng_msg **msgp, size_t size);
-void nng_msg_free(nng_msg *msg);
-int nng_msg_dup(nng_msg **dup, nng_msg *msg);
-int nng_msg_realloc(nng_msg *msg, size_t size);
-int nng_msg_reserve(nng_msg *msg, size_t capacity);
-size_t nng_msg_capacity(nng_msg *msg);
-```
-
-## DESCRIPTION
-
-An {{i:`nng_msg`}} represents a single {{i:message}} sent between Scalability Protocols peers.
-
-Messages in Scalability Protocols are the fundamental unit of transmission and reception,
-as these protocols are fundamentally message-oriented.
-
-> [!NOTE]
-> The `nng_msg` structure is opaque, and applications should never try to
-> rely on the size of it, nor access internal members directly.
-> This insulates the application from changes in subsequent _NNG_ versions
-> that would affect the binary representation of the `nng_msg` itself.
-
-Messages have a [body][nng_msg_body]{{hi:body}}, containing the application-supplied
-payload, and a [header][nng_msg_header]{{hi:header}}, containing protocol specific routing and similar
-related information.
-
-> [!TIP]
-> Only applications using [raw mode][raw] need to access the message header.
-
-### Creating and Destroying Messages
-
-Messages are allocated using {{i:`nng_msg_alloc`}},
-and are deallocated using {{i:`nng_msg_free`}}.
-
-The `nng_msg_alloc` function takes a _size_ argument, and returns a message
-with a preallocated body of that size in the _msgp_ parameter.
-
-Messages can be deallocated when no longer needed using `nng_msg_free`.
-
-A message may be duplicated using the {{i:`nng_msg_dup`}} function, which can be useful
-when a copy must be saved or modified. The contents of the duplicate message will
-be the same, but the actual pointers may be different, and the amount of reserved
-space may be different as well.
-
-### Message Size and Capacity
-
-The message size may be changed by use of the {{i:`nng_msg_realloc`}} function. This
-function will reallocate the underlying memory for the message _msg_,
-preserving contents while doing so.
-If the new size is smaller than the original message, it will
-truncate the message, but not perform any allocations.
-If reallocation fails due to insufficient memory, then the original is left intact.
-
-If message growth is anticipated, the {{i:`nng_msg_reserve`}} function can be used
-to ensure that the buffers underlying the message will be sufficient to hold a message
-of at least _capacity_ bytes. The actual message {{i:capacity}} can be obtained using the
-{{i:`nng_msg_capacity`}}. As long as the new size will not exceeed that capacity,
-any functions that change the message will do so without an allocation, and are guaranteed
-to succeed.
-
-> [!IMPORTANT]
-> Any pointers to message content obtained before a call to `nng_msg_realloc` or
-> `nng_msg_reserve` (or any other function that changes the message size) should be
-> treated as invalid, as the locations pointed to may be deallocated by these functions.
-
-### Performance Considerations
-
-While there are convenience wrappers for sending and receiving arrays of
-bytes, using message objects directly when possible will give better
-performance by reducing data copies and needless allocations.
-
-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.
-These scratch areas, the "{{i:headroom}}" and "{{i:tailroom}}", are automatically
-included when allocating a message.
-
-Using `nng_msg_reserve` to ensure that adequate buffer space is available
-in advance can reduce repeated allocations and data copies when modifying messages.
-
-## RETURN VALUES
-
-The `nng_msg_alloc`, `nng_msg_dup`, `nng_msg_realloc`, and `nng_msg_reserve`
-functions return zero on success, or an error value on failure, typically `NNG_ENOMEM`.
-
-The `nng_msg_capacity` function returns the total body capacity of the message _msg_.
-
-## ERRORS
-
-- `NNG_ENOMEM`: Insufficient free memory exists to perform the operation.
-
-## Examples
-
-### Example 1: Preparing a message for use
-
-```c
-    #include <nng/nng.h>
-
-    nng_msg *m;
-    if (nng_msg_alloc(&m, strlen("content") + 1) != 0) {
-       // handle error
-    }
-    strcpy(nng_msg_body(m), "content");
-```
-
-### Example 2: Preallocating message content
-
-```c
-    if (nng_msg_alloc(&m, 1024) != 0) {
-        // handle error
-    }
-    while ((val64 = next_datum()) != 0) P
-        if (nng_msg_append_u64(m, val64) != 0) {
-            // handle error
-        }
-    }
-```
-
-## SEE ALSO
-
-[nng_aio_get_msg][nng_aio_get_msg],
-[nng_msg_body][nng_msg_body],
-[nng_msg_header][nng_msg_header],
-[nng_msg_set_pipe][nng_msg_set_pipe],
-[nng_recvmsg][nng_recvmsg],
-[nng_sendmsg][nng_sendmsg]
-
-[nng_msg_body]: ./nng_msg_body.md
-[nng_msg_header]: ./nng_msg_header.md
-[nng_msg_set_pipe]: ./nng_msg_set_pipe.md
-[nng_aio_get_msg]: TODO.md
-[nng_aio_set_msg]: TODO.md
-[nng_recvmsg]: TODO.md
-[nng_sendmsg]: TODO.md
-[raw]: TODO.md