/*      $OpenBSD: uio.h,v 1.20 2024/10/26 05:39:03 jsg Exp $    */
/*      $NetBSD: uio.h,v 1.12 1996/02/09 18:25:45 christos Exp $        */

/*
 * Copyright (c) 1982, 1986, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)uio.h       8.5 (Berkeley) 2/22/94
 */

#ifndef _SYS_UIO_H_
#define _SYS_UIO_H_

#include <sys/cdefs.h>
#include <sys/_types.h>

#ifndef _SIZE_T_DEFINED_
#define _SIZE_T_DEFINED_
typedef __size_t        size_t;
#endif

#ifndef _SSIZE_T_DEFINED_
#define _SSIZE_T_DEFINED_
typedef __ssize_t       ssize_t;
#endif

struct iovec {
        void    *iov_base;      /* Base address. */
        size_t   iov_len;       /* Length. */
};

#if __BSD_VISIBLE       /* needed by kdump */
enum    uio_rw { UIO_READ, UIO_WRITE };

/* Segment flag values. */
enum uio_seg {
        UIO_USERSPACE,          /* from user data space */
        UIO_SYSSPACE            /* from system space */
};
#endif /* __BSD_VISIBLE */

#ifdef _KERNEL
struct uio {
        struct  iovec *uio_iov; /* pointer to array of iovecs */
        int     uio_iovcnt;     /* number of iovecs in array */
        off_t   uio_offset;     /* offset into file this uio corresponds to */
        size_t  uio_resid;      /* residual i/o count */
        enum    uio_seg uio_segflg; /* see above */
        enum    uio_rw uio_rw;  /* see above */
        struct  proc *uio_procp;/* associated thread or NULL */
};

/*
 * Limits
 */
#define UIO_SMALLIOV    8               /* 8 on stack, else malloc */
#endif /* _KERNEL */

#if __BSD_VISIBLE
#define UIO_MAXIOV      1024            /* Deprecated, use IOV_MAX instead */
#endif

#ifndef _KERNEL
__BEGIN_DECLS
#if __BSD_VISIBLE
ssize_t preadv(int, const struct iovec *, int, __off_t);
ssize_t pwritev(int, const struct iovec *, int, __off_t);
#endif /* __BSD_VISIBLE */
ssize_t readv(int, const struct iovec *, int);
ssize_t writev(int, const struct iovec *, int);
__END_DECLS
#else
int     ureadc(int c, struct uio *);

int     iovec_copyin(const struct iovec *, struct iovec **, struct iovec *,
            unsigned int, size_t *);
void    iovec_free(struct iovec *, unsigned int );
int     dofilereadv(struct proc *, int, struct uio *, int, register_t *);
int     dofilewritev(struct proc *, int, struct uio *, int, register_t *);

#endif /* !_KERNEL */

#endif /* !_SYS_UIO_H_ */