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