107 lines
3.6 KiB
C
107 lines
3.6 KiB
C
/*
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* Copyright (c) 1982, 1986, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)uio.h 8.5 (Berkeley) 2/22/94
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* $FreeBSD$
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*/
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#ifndef _SYS_UIO_H_
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#define _SYS_UIO_H_
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/*
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* XXX
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* iov_base should be a void *.
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*/
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struct iovec {
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char *iov_base; /* Base address. */
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size_t iov_len; /* Length. */
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};
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enum uio_rw { UIO_READ, UIO_WRITE };
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/* Segment flag values. */
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enum uio_seg {
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UIO_USERSPACE, /* from user data space */
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UIO_SYSSPACE, /* from system space */
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UIO_USERISPACE, /* from user I space */
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UIO_NOCOPY /* don't copy, already in object */
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};
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#ifdef _KERNEL
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struct uio {
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struct iovec *uio_iov;
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int uio_iovcnt;
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off_t uio_offset;
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int uio_resid;
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enum uio_seg uio_segflg;
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enum uio_rw uio_rw;
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struct thread *uio_td;
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};
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/*
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* Limits
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*
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* N.B.: UIO_MAXIOV must be no less than IOV_MAX from <sys/syslimits.h>
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* which in turn must be no less than _XOPEN_IOV_MAX from <limits.h>. If
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* we ever make this tunable (probably pointless), then IOV_MAX should be
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* removed from <sys/syslimits.h> and applications would be expected to use
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* sysconf(3) to find out the correct value, or else assume the worst
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* (_XOPEN_IOV_MAX). Perhaps UIO_MAXIOV should be simply defined as
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* IOV_MAX.
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*/
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#define UIO_MAXIOV 1024 /* max 1K of iov's */
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#define UIO_SMALLIOV 8 /* 8 on stack, else malloc */
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struct vm_object;
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void uio_yield __P((void));
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int uiomove __P((caddr_t, int, struct uio *));
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int uiomoveco __P((caddr_t, int, struct uio *, struct vm_object *));
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int uioread __P((int, struct uio *, struct vm_object *, int *));
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int copyinfrom __P((const void *src, void *dst, size_t len, int seg));
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int copyinstrfrom __P((const void *src, void *dst, size_t len,
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size_t *copied, int seg));
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#else /* !_KERNEL */
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#include <sys/cdefs.h>
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__BEGIN_DECLS
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ssize_t readv __P((int, const struct iovec *, int));
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ssize_t writev __P((int, const struct iovec *, int));
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__END_DECLS
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#endif /* _KERNEL */
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#endif /* !_SYS_UIO_H_ */
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