− read asynchronous I/O events from the completion
<linux/aio_abi.h> /* Defines needed types */
#include <linux/time.h> /* Defines ’struct
io_getevents(aio_context_t ctx_id, long
min_nr, long nr,
struct io_event *events, struct timespec
There is no glibc wrapper for this system call; see
io_getevents() system call attempts to read at least
min_nr events and up to nr events from the
completion queue of the AIO context specified by
timeout argument specifies the amount of time to wait
for events, and is specified as a relative timeout in a
structure of the following form:
time_t tv_sec; /* seconds */
long tv_nsec; /* nanoseconds [0 .. 999999999] */
time will be rounded up to the system clock granularity and
is guaranteed not to expire early.
timeout as NULL means block indefinitely until at
least min_nr events have been obtained.
io_getevents() returns the number of events read.
This may be 0, or a value less than min_nr, if the
timeout expired. It may also be a nonzero value less
than min_nr, if the call was interrupted by a signal
For the failure
return, see NOTES.
Either events or
timeout is an invalid pointer.
ctx_id is invalid. min_nr is out of range
or nr is out of range.
Interrupted by a signal handler; see
io_getevents() is not implemented on this
asynchronous I/O system calls first appeared in Linux
is Linux-specific and should not be used in programs that
are intended to be portable.
Glibc does not
provide a wrapper function for this system call. You could
invoke it using syscall(2). But instead, you probably
want to use the io_getevents() wrapper function
provided by libaio.
Note that the
libaio wrapper function uses a different type
(io_context_t) for the ctx_id argument. Note
also that the libaio wrapper does not follow the
usual C library conventions for indicating errors: 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
ctx_id may cause a segmentation fault instead of
generating the error EINVAL.
io_submit(2), aio(7), time(7)
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