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001: /* include/linux/aio_abi.h
002:  *
003:  * Copyright 2000,2001,2002 Red Hat.
004:  *
005:  * Written by Benjamin LaHaise <bcrl@kvack.org>
006:  *
007:  * Distribute under the terms of the GPLv2 (see ../../COPYING) or under 
008:  * the following terms.
009:  *
010:  * Permission to use, copy, modify, and distribute this software and its
011:  * documentation is hereby granted, provided that the above copyright
012:  * notice appears in all copies.  This software is provided without any
013:  * warranty, express or implied.  Red Hat makes no representations about
014:  * the suitability of this software for any purpose.
015:  *
016:  * IN NO EVENT SHALL RED HAT BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
017:  * SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF
018:  * THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF RED HAT HAS BEEN ADVISED
019:  * OF THE POSSIBILITY OF SUCH DAMAGE.
020:  *
021:  * RED HAT DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
022:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
023:  * PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND
024:  * RED HAT HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
025:  * ENHANCEMENTS, OR MODIFICATIONS.
026:  */
027: #ifndef __LINUX__AIO_ABI_H
028: #define __LINUX__AIO_ABI_H
029: 
030: #include <linux/types.h>
031: #include <asm/byteorder.h>
032: 
033: typedef unsigned long   aio_context_t;
034: 
035: enum {
036:         IOCB_CMD_PREAD = 0,
037:         IOCB_CMD_PWRITE = 1,
038:         IOCB_CMD_FSYNC = 2,
039:         IOCB_CMD_FDSYNC = 3,
040:         /* These two are experimental.
041:          * IOCB_CMD_PREADX = 4,
042:          * IOCB_CMD_POLL = 5,
043:          */
044:         IOCB_CMD_NOOP = 6,
045:         IOCB_CMD_PREADV = 7,
046:         IOCB_CMD_PWRITEV = 8,
047: };
048: 
049: /*
050:  * Valid flags for the "aio_flags" member of the "struct iocb".
051:  *
052:  * IOCB_FLAG_RESFD - Set if the "aio_resfd" member of the "struct iocb"
053:  *                   is valid.
054:  */
055: #define IOCB_FLAG_RESFD         (1 << 0)
056: 
057: /* read() from /dev/aio returns these structures. */
058: struct io_event {
059:         __u64           data;           /* the data field from the iocb */
060:         __u64           obj;            /* what iocb this event came from */
061:         __s64           res;            /* result code for this event */
062:         __s64           res2;           /* secondary result */
063: };
064: 
065: #if defined(__LITTLE_ENDIAN)
066: #define PADDED(x,y)     x, y
067: #elif defined(__BIG_ENDIAN)
068: #define PADDED(x,y)     y, x
069: #else
070: #error edit for your odd byteorder.
071: #endif
072: 
073: /*
074:  * we always use a 64bit off_t when communicating
075:  * with userland.  its up to libraries to do the
076:  * proper padding and aio_error abstraction
077:  */
078: 
079: struct iocb {
080:         /* these are internal to the kernel/libc. */
081:         __u64   aio_data;       /* data to be returned in event's data */
082:         __u32   PADDED(aio_key, aio_reserved1);
083:                                 /* the kernel sets aio_key to the req # */
084: 
085:         /* common fields */
086:         __u16   aio_lio_opcode; /* see IOCB_CMD_ above */
087:         __s16   aio_reqprio;
088:         __u32   aio_fildes;
089: 
090:         __u64   aio_buf;
091:         __u64   aio_nbytes;
092:         __s64   aio_offset;
093: 
094:         /* extra parameters */
095:         __u64   aio_reserved2;  /* TODO: use this for a (struct sigevent *) */
096: 
097:         /* flags for the "struct iocb" */
098:         __u32   aio_flags;
099: 
100:         /*
101:          * if the IOCB_FLAG_RESFD flag of "aio_flags" is set, this is an
102:          * eventfd to signal AIO readiness to
103:          */
104:         __u32   aio_resfd;
105: }; /* 64 bytes */
106: 
107: #undef IFBIG
108: #undef IFLITTLE
109: 
110: #endif /* __LINUX__AIO_ABI_H */
111: 
112: 

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