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authorGarrett D'Amore <garrett@damore.org>2024-03-31 11:28:24 -0700
committerGarrett D'Amore <garrett@damore.org>2024-03-31 11:28:24 -0700
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-# nng_send
-
-## NAME
-
-nng_send --- send data
-
-## SYNOPSIS
-
-```
-#include <nng/nng.h>
-
-int nng_send(nng_socket s, void *data, size_t size, int flags);
-```
-
-## DESCRIPTION
-
-The `nng_send()` function sends a message containing the _data_ of
-length _size_ using the xref:nng_socket.5.adoc[socket] _s_.
-
-NOTE: The semantics of what sending a message means vary from protocol to
-protocol, so examination of the protocol documentation is encouraged.
-(For example, with an xref:nng_pub.7.adoc[_pub_] socket the data is broadcast, so that
-any peers who have a suitable subscription will be able to receive it using
-xref:nng_recv.3.adoc[`nng_recv()`] or a similar function.)
-Furthermore, some protocols may not support sending data (such as
-xref:nng_sub.7.adoc[_sub_]) or may require other conditions.
-(For example, xref:nng_rep.7.adoc[_rep_] sockets cannot normally send data,
-which are responses to requests, until they have first received a request.)
-
-The _flags_ may contain either of (or neither of) the following values:
-
-`NNG_FLAG_NONBLOCK`::
- The function returns immediately, regardless of whether
- the socket is able to accept the data or not. If the socket is unable
- to accept the data (such as if backpressure exists because the peers
- are consuming messages too slowly, or no peer is present), then the
- function will return with `NNG_EAGAIN`. If this flag is not specified,
- then the function will block if such a condition exists.
-
-`NNG_FLAG_ALLOC`::
- The _data_ was allocated using xref:nng_alloc.3.adoc[`nng_alloc()`], or was
- obtained from a call to xref:nng_recv.3.adoc[`nng_recv()`] with
- the `NNG_FLAG_ALLOC` flag.
- If this function returns success, then the _data_ is "owned" by the
- function, and it will assume responsibility for calling
- xref:nng_free.3.adoc[`nng_free()`] when it is no longer needed.
- In the absence of this flag, the _data_ is copied by the implementation
- before the function returns to the caller.
-
-TIP: The `NNG_FLAG_ALLOC` flag can be used to reduce data copies, thereby
-increasing performance.
-
-NOTE: Regardless of the presence or absence of `NNG_FLAG_NONBLOCK`, there may
-be queues between the sender and the receiver.
-Furthermore, there is no guarantee that the message has actually been delivered.
-Finally, with some protocols, the semantic is implicitly `NNG_FLAG_NONBLOCK`,
-such as with xref:nng_pub.7.adoc[_pub_] sockets, which are best-effort delivery only.
-
-IMPORTANT: When using `NNG_FLAG_ALLOC`, it is important that the value of _size_
-match the actual allocated size of the data.
-Using an incorrect size results
-in unspecified behavior, which may include heap corruption, program crashes,
-or trans-dimensional mutation of the program's author.
-
-## RETURN VALUES
-
-This function returns 0 on success, and non-zero otherwise.
-
-## ERRORS
-
-* `NNG_EAGAIN`: The operation would block, but `NNG_FLAG_NONBLOCK` was specified.
-* `NNG_ECLOSED`: The socket _s_ is not open.
-* `NNG_EINVAL`: An invalid set of _flags_ was specified.
-* `NNG_EMSGSIZE`: The value of _size_ is too large.
-* `NNG_ENOMEM`: Insufficient memory is available.
-* `NNG_ENOTSUP`: The protocol for socket _s_ does not support sending.
-* `NNG_ESTATE`: The socket _s_ cannot send data in this state.
-* `NNG_ETIMEDOUT`: The operation timed out.
-
-## SEE ALSO
-
-[nng_alloc][nng_alloc],
-[nng_free][nng_free],
-[nng_recv][nng_recv],
-[nng_sendmsg][nng_sendmsg],
-[nng_strerror][nng_strerror],
-[nng_socket][nng_socket],
-[nng][nng]
-
-{{#include ../refs.md}}