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AIO_WRITE(3) Linux Programmer's Manual AIO_WRITE(3)
aio_write - asynchronous write
#include <aio.h>
int aio_write(struct aiocb *aiocbp);
Link with -lrt.
The aio_write() function queues the I/O request described by the buffer
pointed to by aiocb. This function is the asynchronous analog of write(2).
The arguments of the call
write(fd, buf, count)
correspond (in order) to the fields aio_fildes, aio_buf, and aio_nbytes of the
structure pointed to by aiocbp. (See aio(7) for a description of the aiocb
structure.)
If O_APPEND is not set, the data is written starting at the absolute file
offset aiocbp->aio_offset, regardless of the current file offset. If O_APPEND
is set, data is written at the end of the file in the same order as
aio_write() calls are made. After the call, the value of the current file
offset is unspecified.
The "asynchronous" means that this call returns as soon as the request has
been enqueued; the write may or may not have completed when the call returns.
One tests for completion using aio_error(3). The return status of a completed
I/O operation can be obtained aio_return(3). Asynchronous notification of I/O
completion can be obtained by setting aiocbp->aio_sigevent appropriately; see
sigevent(7) for details.
If _POSIX_PRIORITIZED_IO is defined, and this file supports it, then the
asynchronous operation is submitted at a priority equal to that of the calling
process minus aiocbp->aio_reqprio.
The field aiocbp->aio_lio_opcode is ignored.
No data is written to a regular file beyond its maximum offset.
On success, 0 is returned. On error the request is not enqueued, -1 is
returned, and errno is set appropriately. If an error is only detected later,
it will be reported via aio_return(3) (returns status -1) and aio_error(3)
(error status whatever one would have gotten in errno, such as EBADF).
EAGAIN Out of resources.
EBADF aio_fildes is not a valid file descriptor open for writing.
EFBIG The file is a regular file, we want to write at least one byte, but the
starting position is at or beyond the maximum offset for this file.
EINVAL One or more of aio_offset, aio_reqprio, aio_nbytes are invalid.
ENOSYS This function is not supported.
The aio_write() function is available since glibc 2.1.
POSIX.1-2001, POSIX.1-2008.
It is a good idea to zero out the control block before use. The control block
must not be changed while the write operation is in progress. The buffer area
being written out must not be accessed during the operation or undefined
results may occur. The memory areas involved must remain valid.
Simultaneous I/O operations specifying the same aiocb structure produce
undefined results.
aio_cancel(3), aio_error(3), aio_fsync(3), aio_read(3), aio_return(3),
aio_suspend(3), lio_listio(3), aio(7)
This page is part of release 3.32 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can be found
at http://www.kernel.org/doc/man-pages/.
2010-10-02 AIO_WRITE(3)
HTML rendering created 2010-12-03 by Michael Kerrisk, author of The Linux Programming Interface