отменить невыполненную асинхронную операцию ввода-вывода (cancel an outstanding asynchronous I/O operation)
Имя (Name)
io_cancel - cancel an outstanding asynchronous I/O operation
Синопсис (Synopsis)
#include <linux/aio_abi.h> /* Definition of needed types */
#include <sys/syscall.h> /* Definition of SYS_* constants */
#include <unistd.h>
int syscall(SYS_io_cancel, aio_context_t ctx_id, struct iocb *iocb,
struct io_event *result);
Описание (Description)
Note: this page describes the raw Linux system call interface.
The wrapper function provided by libaio uses a different type for
the ctx_id argument. See NOTES.
The io_cancel() system call attempts to cancel an asynchronous
I/O operation previously submitted with io_submit(2). The iocb
argument describes the operation to be canceled and the ctx_id
argument is the AIO context to which the operation was submitted.
If the operation is successfully canceled, the event will be
copied into the memory pointed to by result without being placed
into the completion queue.
Возвращаемое значение (Return value)
On success, io_cancel() returns 0. For the failure return, see
NOTES.
Ошибки (Error)
EAGAIN The iocb specified was not canceled.
EFAULT One of the data structures points to invalid data.
EINVAL The AIO context specified by ctx_id is invalid.
ENOSYS io_cancel() is not implemented on this architecture.
Версии (Versions)
The asynchronous I/O system calls first appeared in Linux 2.5.
Стандарты (Conforming to)
io_cancel() is Linux-specific and should not be used in programs
that are intended to be portable.
Примечание (Note)
You probably want to use the io_cancel() 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 error.
Смотри также (See also)
io_destroy(2), io_getevents(2), io_setup(2), io_submit(2), aio(7)
