асинхронный ввод и вывод (asynchronous input and output)
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.h — asynchronous input and output
Синопсис (Synopsis)
#include <aio.h>
Описание (Description)
The <aio.h> header shall define the aiocb structure, which shall
include at least the following members:
int aio_fildes File descriptor.
off_t aio_offset File offset.
volatile void *aio_buf Location of buffer.
size_t aio_nbytes Length of transfer.
int aio_reqprio Request priority offset.
struct sigevent aio_sigevent Signal number and value.
int aio_lio_opcode Operation to be performed.
The <aio.h> header shall define the off_t, pthread_attr_t,
size_t, and ssize_t types as described in <sys/types.h>.
The <aio.h> header shall define the struct timespec structure as
described in <time.h>.
The <aio.h> header shall define the sigevent structure and sigval
union as described in signal.h(0p).
The <aio.h> header shall define the following symbolic constants:
AIO_ALLDONE A return value indicating that none of the
requested operations could be canceled since they
are already complete.
AIO_CANCELED A return value indicating that all requested
operations have been canceled.
AIO_NOTCANCELED
A return value indicating that some of the
requested operations could not be canceled since
they are in progress.
LIO_NOP A lio_listio() element operation option indicating
that no transfer is requested.
LIO_NOWAIT A lio_listio() synchronization operation indicating
that the calling thread is to continue execution
while the lio_listio() operation is being
performed, and no notification is given when the
operation is complete.
LIO_READ A lio_listio() element operation option requesting
a read.
LIO_WAIT A lio_listio() synchronization operation indicating
that the calling thread is to suspend until the
lio_listio() operation is complete.
LIO_WRITE A lio_listio() element operation option requesting
a write.
The following shall be declared as functions and may also be
defined as macros. Function prototypes shall be provided.
int aio_cancel(int, struct aiocb *);
int aio_error(const struct aiocb *);
int aio_fsync(int, struct aiocb *);
int aio_read(struct aiocb *);
ssize_t aio_return(struct aiocb *);
int aio_suspend(const struct aiocb *const [], int,
const struct timespec *);
int aio_write(struct aiocb *);
int lio_listio(int, struct aiocb *restrict const [restrict], int,
struct sigevent *restrict);
Inclusion of the <aio.h> header may make visible symbols defined
in the headers <fcntl.h>, <signal.h>, and <time.h>.
The following sections are informative.
Использование в приложениях (Application usage)
None.
Обоснование (Rationale)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
fcntl.h(0p), signal.h(0p), sys_types.h(0p), time.h(0p)
The System Interfaces volume of POSIX.1‐2017, aio_cancel(3p),
aio_error(3p), aio_fsync(3p), aio_read(3p), aio_return(3p),
aio_suspend(3p), aio_write(3p), fsync(3p), lio_listio(3p),
lseek(3p), read(3p), write(3p)
