= nng_tcp_send(3tcp) // // Copyright 2018 Staysail Systems, Inc. // Copyright 2018 Capitar IT Group BV // // This document is supplied under the terms of the MIT License, a // copy of which should be located in the distribution where this // file was obtained (LICENSE.txt). A copy of the license may also be // found online at https://opensource.org/licenses/MIT. // == NAME nng_tcp_send - send to TCP connection == SYNOPSIS [source, c] ---- #include #include void nng_tcp_send(nng_tcp *conn, nng_aio *aio); ---- == DESCRIPTION The `nng_tcp_send()` function starts an asynchronous send over the TCP connection _conn_ from the scatter/gather vector located in the asynchronous I/O structure _aio_. NOTE: The `<>` function must have been called first, to set the scatter/gather vector for _aio_. This function returns immediately, with no return value. Completion of the operation is signaled via the _aio_, and the final result may be obtained via `<>`. That result will either be zero or an error code. The I/O operation completes as soon as at least one byte has been sent, or an error has occurred. Therefore, the number of bytes sent may be less than requested. The actual number of bytes sent can be determined with `<>`. NOTE: While TCP has the notion of urgent (out-of-band) delivery, that is used by very few protocols and this API does not support it. == RETURN VALUES None. == ERRORS [horizontal] `NNG_ECANCELED`:: The operation was canceled. `NNG_ECLOSED`:: The connection was closed. `NNG_ECONNRESET`:: The peer closed the connection. `NNG_EINVAL`:: The _aio_ does not contain a valid scatter/gather vector. `NNG_ENOMEM`:: Insufficient free memory to perform the operation. `NNG_ETIMEDOUT`:: Timeout waiting for data from the connection. == SEE ALSO [.text-left] <>, <>, <>, <>, <>, <>, <>, <>