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56 lines
1.6 KiB
C
56 lines
1.6 KiB
C
/* Copyright (C) 2007, 2008, 2009 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C 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
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but 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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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <sys/eventfd.h>
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#include <sysdep.h>
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#include <kernel-features.h>
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int
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eventfd (int count, int flags)
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{
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#ifdef __NR_eventfd2
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int res = INLINE_SYSCALL (eventfd2, 2, count, flags);
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# ifndef __ASSUME_EVENTFD2
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if (res != -1 || errno != ENOSYS)
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# endif
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return res;
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#endif
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#ifndef __ASSUME_EVENTFD2
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/* The old system call has no flag parameter which is bad. So we have
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to wait until we have to support to pass additional values to the
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kernel (sys_indirect) before implementing setting flags like
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O_NONBLOCK etc. */
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if (flags != 0)
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{
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__set_errno (EINVAL);
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return -1;
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}
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# ifdef __NR_eventfd
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return INLINE_SYSCALL (eventfd, 1, count);
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# else
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__set_errno (ENOSYS);
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return -1;
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# endif
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#elif !defined __NR_eventfd2
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# error "__ASSUME_EVENTFD2 defined but not __NR_eventfd2"
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#endif
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}
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