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/*
* Copyright (c) 2010, XenSource Inc.
* All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
/*
* kernel 2.6.21 added eventfd(2) support, kernel 2.6.22 eventfds for
* aio. libaio 0.3.107 updated the header file, but few systems have
* it. define a custom iocb_common struct instead, and work around a
* potentially missing sys/eventfd.h. this header should vanish over
* time.
*/
#ifndef __LIBAIO_COMPAT
#define __LIBAIO_COMPAT
#include "../../config.h"
#include <libaio.h>
#include <unistd.h>
#include <sys/syscall.h>
struct __compat_io_iocb_common {
char __pad_buf[8];
char __pad_nbytes[8];
long long offset;
long long __pad3;
unsigned flags;
unsigned resfd;
};
static inline void __io_set_eventfd(struct iocb *iocb, int eventfd)
{
struct __compat_io_iocb_common *c;
c = (struct __compat_io_iocb_common*)&iocb->u.c;
c->flags |= (1 << 0);
c->resfd = eventfd;
}
#ifdef HAVE_SYS_EVENTFD_H
#include <sys/eventfd.h>
static inline int tapdisk_sys_eventfd(int initval)
{
return eventfd(initval, 0);
}
#else /* Fallback */
#ifndef SYS_eventfd
#ifndef __NR_eventfd
# if defined(__alpha__)
# define __NR_eventfd 478
# elif defined(__arm__)
# define __NR_eventfd (__NR_SYSCALL_BASE+351)
# elif defined(__ia64__)
# define __NR_eventfd 1309
# elif defined(__i386__)
# define __NR_eventfd 323
# elif defined(__m68k__)
# define __NR_eventfd 319
# elif 0 && defined(__mips__)
# error __NR_eventfd?
# define __NR_eventfd (__NR_Linux + 319)
# define __NR_eventfd (__NR_Linux + 278)
# define __NR_eventfd (__NR_Linux + 282)
# elif defined(__hppa__)
# define __NR_eventfd (__NR_Linux + 304)
# elif defined(__PPC__) || defined(__powerpc64__)
# define __NR_eventfd 307
# elif defined(__s390__) || defined(__s390x__)
# define __NR_eventfd 318
# elif defined(__sparc__)
# define __NR_eventfd 313
# elif defined(__x86_64__)
# define __NR_eventfd 284
# endif
#else
# error __NR_eventfd?
#endif
#define SYS_eventfd __NR_eventfd
#endif
static inline int tapdisk_sys_eventfd(int initval)
{
return syscall(SYS_eventfd, initval, 0);
}
#endif
#endif /* __LIBAIO_COMPAT */
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