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AIO_READ(3) Linux Programmer’s Manual AIO_READ(3)
NAME
aio_read - asynchronous read
SYNOPSIS
#include <aio.h>
int aio_read(struct aiocb *aiocbp);
DESCRIPTION
The aio_read function requests an asynchronous "n = read(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).
The data is read starting at the absolute file offset aiocbp->aio_offset, regard-
less of the current file position. After this request, the value of the current
file position is unspecified.
The "asynchronous" means that this call returns as soon as the request has been
enqueued; the read 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 asyn-
chronous 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 read from a regular file beyond its maximum offset.
RETURN VALUE
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 what-
ever one would have gotten in errno, such as EBADF).
ERRORS
EAGAIN Out of resources.
EBADF aio_fildes is not a valid file descriptor open for reading.
EINVAL One or more of aio_offset, aio_reqprio, aio_nbytes are invalid.
EOVERFLOW
The file is a regular file, we start reading before end-of-file and want at
least one byte, but the starting position is past the maximum offset for
this file.
ENOSYS This function is not supported.
NOTES
It is a good idea to zero out the control block before use. This control block
must not be changed while the read operation is in progress. The buffer area being
read into must not be accessed during the operation or undefined results may occur.
The memory areas involved must remain valid.
CONFORMING TO
POSIX 1003.1-2003
SEE ALSO
aio_cancel(3), aio_error(3), aio_fsync(3), aio_return(3), aio_suspend(3),
aio_write(3)
2003-11-14 AIO_READ(3)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache/1.3.41 (Unix) PHP/5.2.5 mod_perl/1.30 mod_gzip/1.3.26.1a
Under GNU General Public License
2009-01-08 05:25 @38.103.63.58 CrawledBy CCBot/1.0 (+http://www.commoncrawl.org/bot.html)