blob: 1bd06e9499b6fbacfa71a4e2233bf098a2478424 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
|
# nng_aio_count
## NAME
nng_aio_count --- return number of bytes transferred
## SYNOPSIS
```c
#include <nng/nng.h>
size_t nng_aio_count(nng_aio *aio);
```
## DESCRIPTION
The `nng_aio_count()` returns the number of bytes transferred by the
asynchronous operation associated with the handle _aio_.
Some asynchronous operations do not provide meaningful data for this
function; for example operations that establish connections do not
transfer user data (they may transfer protocol data though) -- in this case
this function will generally return zero.
This function is most useful when used with operations that make use of
of a scatter/gather vector (set by [`nng_aio_set_iov()`][nng_aio_set_iov]).
> [!NOTE]
> The return value from this function is undefined if the operation
> has not completed yet.
> Either call this from the handle's completion callback,
> or after waiting for the operation to complete with
> [`nng_aio_wait()`][nng_aio_wait].
## RETURN VALUES
The number of bytes transferred by the operation.
## SEE ALSO
[nng_aio_alloc][nng_aio_alloc],
[nng_aio_result][nng_aio_result],
[nng_aio_set_iov][nng_aio_set_iov],
[nng_aio_wait][nng_aio_wait]
{{#include ../refs.md}}
|
