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aio_write - asynchronous write
int aio_write(struct aiocb *aiocbp);
Link with -lrt.
The aio_write() function requests an asynchronous "n = write(fd, buf,
count)" with fd, buf, count given by aiocbp->aio_fildes,
aiocbp->aio_buf, aiocbp->aio_nbytes, respectively. The return status n
can be retrieved upon completion using aio_return(3).
If O_APPEND is not set, the data is written starting at the absolute
file offset aiocbp->aio_offset, regardless of the current file
position. If O_APPEND is set, the data is written at the end of the
file. After this request, the value of the current file position is
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).
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 first
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
EINVAL One or more of aio_offset, aio_reqprio, aio_nbytes are invalid.
ENOSYS This function is not supported.
It is a good idea to zero out the control block before use. This
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.
aio_cancel(3), aio_error(3), aio_fsync(3), aio_read(3), aio_return(3),
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