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
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
=head1 NAME
nbd_aio_peek_command_completed - check if any command has completed
=head1 SYNOPSIS
#include <libnbd.h>
int64_t nbd_aio_peek_command_completed (
struct nbd_handle *h
);
=head1 DESCRIPTION
Return the unique positive
64 bit cookie of the first non-retired but
completed command, C<0> if there are in-flight commands but none of
them are awaiting retirement, or C<-1> on error including when there
are no in-flight commands. Any cookie returned by this function must
still be passed to L<nbd_aio_command_completed(3)> to actually retire
the command and learn whether the command was successful.
=head1 RETURN VALUE
This call returns a 64 bit signed integer E<ge> C<0>.
=head1 ERRORS
On error C<-1> is returned.
Refer to L<libnbd(3)/ERROR HANDLING>
for how to get further details of the error.
The following parameters must not be NULL: C<h>.
For more information see L<libnbd(3)/Non-NULL parameters>.
=head1 VERSION
This function first appeared in libnbd 1.0.
If you need to test if this function is available at compile time
check if the following macro is defined:
#define LIBNBD_HAVE_NBD_AIO_PEEK_COMMAND_COMPLETED 1
=head1 SEE ALSO
L<nbd_aio_command_completed(3)>,
L<nbd_create(3)>,
L<libnbd(3)>.
=head1 AUTHORS
Eric Blake
Richard W.M. Jones
=head1 COPYRIGHT
Copyright Red Hat
|
