diff options
| author | Garrett D'Amore <garrett@damore.org> | 2024-03-31 11:28:24 -0700 |
|---|---|---|
| committer | Garrett D'Amore <garrett@damore.org> | 2024-03-31 11:28:24 -0700 |
| commit | 309583d7b4171cf6851d4ba89e07909642180015 (patch) | |
| tree | bf64e74e9666038e71db0c7826fe706977627cd8 /docs/reference/src/sock/nng_send.3.adoc | |
| parent | 1bcf60a65ee56054e638c0859da1fe2418160bc6 (diff) | |
| download | nng-mdbook.tar.gz nng-mdbook.tar.bz2 nng-mdbook.zip | |
nng_send*mdbook
Diffstat (limited to 'docs/reference/src/sock/nng_send.3.adoc')
| -rw-r--r-- | docs/reference/src/sock/nng_send.3.adoc | 90 |
1 files changed, 0 insertions, 90 deletions
diff --git a/docs/reference/src/sock/nng_send.3.adoc b/docs/reference/src/sock/nng_send.3.adoc deleted file mode 100644 index 4932712a..00000000 --- a/docs/reference/src/sock/nng_send.3.adoc +++ /dev/null @@ -1,90 +0,0 @@ -# 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}} |
