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https://github.com/xen-project/xen.git
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Ian Campbell
b073e110e8
arm64 only has the eventfd2 system call and using the libc wrapper when available hides this from us. eventfd() has been in libc since glibc 2.8. This code is already Linux specific. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
105 lines
2.8 KiB
C
105 lines
2.8 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, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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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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