получить статус возврата асинхронной операции ввода-вывода (retrieve return status of an asynchronous I/O operation)
Пролог (Prolog)
This manual page is part of the POSIX Programmer's Manual. The
Linux implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
Имя (Name)
aio_return — retrieve return status of an asynchronous I/O
operation
Синопсис (Synopsis)
#include <aio.h>
ssize_t aio_return(struct aiocb *aiocbp);
Описание (Description)
The aio_return() function shall return the return status
associated with the aiocb structure referenced by the aiocbp
argument. The return status for an asynchronous I/O operation is
the value that would be returned by the corresponding read(),
write(), or fsync() function call. If the error status for the
operation is equal to [EINPROGRESS], then the return status for
the operation is undefined. The aio_return() function may be
called exactly once to retrieve the return status of a given
asynchronous operation; thereafter, if the same aiocb structure
is used in a call to aio_return() or aio_error(), an error may be
returned. When the aiocb structure referred to by aiocbp is used
to submit another asynchronous operation, then aio_return() may
be successfully used to retrieve the return status of that
operation.
Возвращаемое значение (Return value)
If the asynchronous I/O operation has completed, then the return
status, as described for read(), write(), and fsync(), shall be
returned. If the asynchronous I/O operation has not yet
completed, the results of aio_return() are undefined.
If the aio_return() function fails, it shall return -1 and set
errno to indicate the error.
Ошибки (Error)
The aio_return() function may fail if:
EINVAL The aiocbp argument does not refer to an asynchronous
operation whose return status has not yet been retrieved.
The following sections are informative.
Примеры (Examples)
None.
Использование в приложениях (Application usage)
None.
Обоснование (Rationale)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
aio_cancel(3p), aio_error(3p), aio_fsync(3p), aio_read(3p),
aio_write(3p), close(3p), exec(1p), exit(3p), fork(3p),
lio_listio(3p), lseek(3p), read(3p)
The Base Definitions volume of POSIX.1‐2017, aio.h(0p)
