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IO_GETEVENTS
Section: Linux Programmer's Manual (2)
Updated: 2008-07-04
Index
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NAME
io_getevents - read asynchronous I/O events from the completion queue
SYNOPSIS
#include <linux/time.h>
#include <libaio.h>
int io_getevents(aio_context_t ctx_id, long min_nr, long nr,
struct io_event *events, struct timespec *timeout);
Link with -laio.
DESCRIPTION
io_getevents()
attempts to read at least min_nr events and
up to nr events from the completion queue of the AIO context
specified by ctx_id.
timeout specifies the amount of time to wait for events,
where a NULL timeout waits until at least min_nr events
have been seen.
Note that timeout is relative and will be updated if not NULL
and the operation blocks.
RETURN VALUE
On success,
io_getevents()
returns the number of events read: 0 if no events are
available, or less than min_nr if the timeout has elapsed.
For the failure return, see NOTES.
ERRORS
- EFAULT
-
Either events or timeout is an invalid pointer.
- EINVAL
-
ctx_id is invalid.
min_nr is out of range or nr is
out of range.
- EINTR
-
Interrupted by a signal handler; see
signal(7).
- ENOSYS
-
io_getevents()
is not implemented on this architecture.
VERSIONS
The asynchronous I/O system calls first appeared in Linux 2.5, August 2002.
CONFORMING TO
io_getevents()
is Linux-specific and should not be used in
programs that are intended to be portable.
NOTES
Glibc does not provide a wrapper function for this system call.
The wrapper provided in
libaio
for
io_getevents()
does not follow the usual C library conventions for indicating error:
on error it returns a negated error number
(the negative of one of the values listed in ERRORS).
If the system call is invoked via
syscall(2),
then the return value follows the usual conventions for
indicating an error: -1, with
errno
set to a (positive) value that indicates the error.
SEE ALSO
io_cancel(2),
io_destroy(2),
io_setup(2),
io_submit(2),
time(7)
COLOPHON
This page is part of release 3.27 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- VERSIONS
-
- CONFORMING TO
-
- NOTES
-
- SEE ALSO
-
- COLOPHON
-
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