отменить невыполненный запрос асинхронного ввода-вывода (cancel an outstanding asynchronous I/O request)
Имя (Name)
aio_cancel - cancel an outstanding asynchronous I/O request
Синопсис (Synopsis)
#include <aio.h>
int aio_cancel(int fd, struct aiocb *aiocbp);
Link with -lrt.
Описание (Description)
The aio_cancel() function attempts to cancel outstanding
asynchronous I/O requests for the file descriptor fd. If aiocbp
is NULL, all such requests are canceled. Otherwise, only the
request described by the control block pointed to by aiocbp is
canceled. (See aio(7) for a description of the aiocb structure.)
Normal asynchronous notification occurs for canceled requests
(see aio(7) and sigevent(7)). The request return status
(aio_return(3)) is set to -1, and the request error status
(aio_error(3)) is set to ECANCELED. The control block of
requests that cannot be canceled is not changed.
If the request could not be canceled, then it will terminate in
the usual way after performing the I/O operation. (In this case,
aio_error(3) will return the status EINPROGRESSS.)
If aiocbp is not NULL, and fd differs from the file descriptor
with which the asynchronous operation was initiated, unspecified
results occur.
Which operations are cancelable is implementation-defined.
Возвращаемое значение (Return value)
The aio_cancel() function returns one of the following values:
AIO_CANCELED
All requests were successfully canceled.
AIO_NOTCANCELED
At least one of the requests specified was not canceled
because it was in progress. In this case, one may check
the status of individual requests using aio_error(3).
AIO_ALLDONE
All requests had already been completed before the call.
-1 An error occurred. The cause of the error can be found by
inspecting errno.
Ошибки (Error)
EBADF fd is not a valid file descriptor.
ENOSYS aio_cancel() is not implemented.
Версии (Versions)
The aio_cancel() function is available since glibc 2.1.
Атрибуты (Attributes)
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│aio_cancel() │ Thread safety │ MT-Safe │
└──────────────────────────────────────┴───────────────┴─────────┘
Стандарты (Conforming to)
POSIX.1-2001, POSIX.1-2008.
Примеры (Examples)
See aio(7).
Смотри также (See also)
aio_error(3), aio_fsync(3), aio_read(3), aio_return(3),
aio_suspend(3), aio_write(3), lio_listio(3), aio(7)
