1 /*

     2  * QEMU posix-aio emulation

     3  *

     4  * Copyright IBM, Corp. 2008

     5  *

     6  * Authors:

     7  *  Anthony Liguori   <aliguori@us.ibm.com>

     8  *

     9  * This work is licensed under the terms of the GNU GPL, version 2.  See

    10  * the COPYING file in the top-level directory.

    11  *

    12  */

    13 

    14 #ifndef QEMU_POSIX_AIO_COMPAT_H

    15 #define QEMU_POSIX_AIO_COMPAT_H

    16 

    17 #include <sys/types.h>

    18 #include <unistd.h>

    19 #include <signal.h>

    20 

    21 #include "sys-queue.h"

    22 

    23 #define QEMU_PAIO_CANCELED     0x01

    24 #define QEMU_PAIO_NOTCANCELED  0x02

    25 #define QEMU_PAIO_ALLDONE      0x03

    26 

    27 struct qemu_paiocb

    28 {

    29     int aio_fildes;

    30     void *aio_buf;

    31     size_t aio_nbytes;

    32     struct sigevent aio_sigevent;

    33     off_t aio_offset;

    34 

    35     /* private */

    36     TAILQ_ENTRY(qemu_paiocb) node;

    37     int is_write;

    38     ssize_t ret;

    39     int active;

    40 };

    41 

    42 struct qemu_paioinit

    43 {

    44     unsigned int aio_threads;

    45     unsigned int aio_num;

    46     unsigned int aio_idle_time;

    47 };

    48 

    49 int qemu_paio_init(struct qemu_paioinit *aioinit);

    50 int qemu_paio_read(struct qemu_paiocb *aiocb);

    51 int qemu_paio_write(struct qemu_paiocb *aiocb);

    52 int qemu_paio_error(struct qemu_paiocb *aiocb);

    53 ssize_t qemu_paio_return(struct qemu_paiocb *aiocb);

    54 int qemu_paio_cancel(int fd, struct qemu_paiocb *aiocb);

    55 

    56 #endif