aio.h(3HEAD) Headers aio.h(3HEAD)NAME
aio.h, aio - asynchronous input and output
SYNOPSIS
#include <aio.h>
DESCRIPTION
The <aio.h> header defines the aiocb structure which includes 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
This header also includes the following 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(3RT) 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.
SEE ALSO lseek(2), read(2), write(2), fsync(3C), libaio(3LIB), lio_listio(3RT)SunOS 5.10 10 Sep 2004 aio.h(3HEAD)
Check Out this Related Man Page
LIO_LISTIO(3) BSD Library Functions Manual LIO_LISTIO(3)NAME
lio_listio -- list directed I/O (REALTIME)
LIBRARY
POSIX Real-time Library (librt, -lrt)
SYNOPSIS
#include <aio.h>
int
lio_listio(int mode, struct aiocb * const list[], int nent, struct sigevent *sig);
DESCRIPTION
The lio_listio() function initiates a list of I/O requests with a single function call. The list argument is an array of pointers to aiocb
structures describing each operation to perform, with nent elements. NULL elements are ignored.
The aio_lio_opcode field of each aiocb specifies the operation to be performed. The following operations are supported:
LIO_READ Read data as if by a call to aio_read(3).
LIO_NOP No operation.
LIO_WRITE Write data as if by a call to aio_write(3).
If the mode argument is LIO_WAIT, lio_listio() does not return until all the requested operations have been completed. If mode is
LIO_NOWAIT, the requests are processed asynchronously, and the signal specified by sig is sent when all operations have completed. If sig is
NULL, the calling process is not notified of I/O completion.
The order in which the requests are carried out is not specified, and there is no guarantee that they will be executed sequentially.
RETURN VALUES
If mode is LIO_WAIT, the lio_listio() function returns 0 if the operations completed successfully, otherwise -1.
If mode is LIO_NOWAIT, the lio_listio() function returns 0 if the operations are successfully queued, otherwise -1.
ERRORS
The lio_listio() function will fail if:
[EAGAIN] There are not enough resources to enqueue the requests; or the request would cause the system-wide limit AIO_MAX to be
exceeded.
[EINTR] A signal interrupted the system call before it could be completed.
[EINVAL] The mode argument is neither LIO_WAIT nor LIO_NOWAIT, or nent is greater than AIO_LISTIO_MAX.
[EIO] One or more requests failed.
In addition, the lio_listio() function may fail for any of the reasons listed for aio_read(3) and aio_write(3).
If lio_listio() succeeds, or fails with an error code of EAGAIN, EINTR, or EIO, some of the requests may have been initiated. The caller
should check the error status of each aiocb structure individually by calling aio_error(3).
SEE ALSO read(2), siginfo(2), write(2), aio(3), sigevent(3)STANDARDS
The lio_listio() function is expected to conform to IEEE Std 1003.1-2001 (``POSIX.1'').
BSD August 12, 2011 BSD