aio_abi.h
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上传日期:2009-04-28
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- /* linux/aio_abi.h
- *
- * Copyright 2000,2001,2002 Red Hat.
- *
- * Written by Benjamin LaHaise <bcrl@kvack.org>
- *
- * Distribute under the terms of the GPLv2 (see ../../COPYING) or under
- * the following terms.
- *
- * Permission to use, copy, modify, and distribute this software and its
- * documentation is hereby granted, provided that the above copyright
- * notice appears in all copies. This software is provided without any
- * warranty, express or implied. Red Hat makes no representations about
- * the suitability of this software for any purpose.
- *
- * IN NO EVENT SHALL RED HAT BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
- * SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF
- * THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF RED HAT HAS BEEN ADVISED
- * OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * RED HAT DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND
- * RED HAT HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
- * ENHANCEMENTS, OR MODIFICATIONS.
- */
- #ifndef __LINUX__AIO_ABI_H
- #define __LINUX__AIO_ABI_H
- #include <asm/byteorder.h>
- typedef unsigned long aio_context_t;
- enum {
- IOCB_CMD_PREAD = 0,
- IOCB_CMD_PWRITE = 1,
- IOCB_CMD_FSYNC = 2,
- IOCB_CMD_FDSYNC = 3,
- /* These two are experimental.
- * IOCB_CMD_PREADX = 4,
- * IOCB_CMD_POLL = 5,
- */
- IOCB_CMD_NOOP = 6,
- };
- /* read() from /dev/aio returns these structures. */
- struct io_event {
- __u64 data; /* the data field from the iocb */
- __u64 obj; /* what iocb this event came from */
- __s64 res; /* result code for this event */
- __s64 res2; /* secondary result */
- };
- #if defined(__LITTLE_ENDIAN)
- #define PADDED(x,y) x, y
- #elif defined(__BIG_ENDIAN)
- #define PADDED(x,y) y, x
- #else
- #error edit for your odd byteorder.
- #endif
- /*
- * we always use a 64bit off_t when communicating
- * with userland. its up to libraries to do the
- * proper padding and aio_error abstraction
- */
- struct iocb {
- /* these are internal to the kernel/libc. */
- __u64 aio_data; /* data to be returned in event's data */
- __u32 PADDED(aio_key, aio_reserved1);
- /* the kernel sets aio_key to the req # */
- /* common fields */
- __u16 aio_lio_opcode; /* see IOCB_CMD_ above */
- __s16 aio_reqprio;
- __u32 aio_fildes;
- __u64 aio_buf;
- __u64 aio_nbytes;
- __s64 aio_offset;
- /* extra parameters */
- __u64 aio_reserved2; /* TODO: use this for a (struct sigevent *) */
- __u64 aio_reserved3;
- }; /* 64 bytes */
- #undef IFBIG
- #undef IFLITTLE
- #endif /* __LINUX__AIO_ABI_H */