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Annotation of sys/sys/uio.h, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: uio.h,v 1.13 2005/12/13 00:35:23 millert Exp $        */
                      2: /*     $NetBSD: uio.h,v 1.12 1996/02/09 18:25:45 christos Exp $        */
                      3:
                      4: /*
                      5:  * Copyright (c) 1982, 1986, 1993, 1994
                      6:  *     The Regents of the University of California.  All rights reserved.
                      7:  *
                      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. Neither the name of the University nor the names of its contributors
                     17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
                     19:  *
                     20:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  *
                     32:  *     @(#)uio.h       8.5 (Berkeley) 2/22/94
                     33:  */
                     34:
                     35: #ifndef _SYS_UIO_H_
                     36: #define        _SYS_UIO_H_
                     37:
                     38: struct iovec {
                     39:        void    *iov_base;      /* Base address. */
                     40:        size_t   iov_len;       /* Length. */
                     41: };
                     42:
                     43: enum   uio_rw { UIO_READ, UIO_WRITE };
                     44:
                     45: /* Segment flag values. */
                     46: enum uio_seg {
                     47:        UIO_USERSPACE,          /* from user data space */
                     48:        UIO_SYSSPACE            /* from system space */
                     49: };
                     50:
                     51: #ifdef _KERNEL
                     52: struct uio {
                     53:        struct  iovec *uio_iov; /* pointer to array of iovecs */
                     54:        int     uio_iovcnt;     /* number of iovecs in array */
                     55:        off_t   uio_offset;     /* offset into file this uio corresponds to */
                     56:        size_t  uio_resid;      /* residual i/o count */
                     57:        enum    uio_seg uio_segflg; /* see above */
                     58:        enum    uio_rw uio_rw;  /* see above */
                     59:        struct  proc *uio_procp;/* associated process or NULL */
                     60: };
                     61:
                     62: /*
                     63:  * Limits
                     64:  */
                     65: #define UIO_SMALLIOV   8               /* 8 on stack, else malloc */
                     66: #endif /* _KERNEL */
                     67:
                     68: #define UIO_MAXIOV     1024            /* Deprecated, use IOV_MAX instead */
                     69:
                     70: #ifndef        _KERNEL
                     71: #include <sys/cdefs.h>
                     72:
                     73: __BEGIN_DECLS
                     74: #if __BSD_VISIBLE
                     75: ssize_t preadv(int, const struct iovec *, int, off_t);
                     76: ssize_t pwritev(int, const struct iovec *, int, off_t);
                     77: #endif /* __BSD_VISIBLE */
                     78: ssize_t        readv(int, const struct iovec *, int);
                     79: ssize_t        writev(int, const struct iovec *, int);
                     80: __END_DECLS
                     81: #else
                     82: int    ureadc(int c, struct uio *);
                     83:
                     84: int    dofilereadv(struct proc *, int, struct file *,
                     85:            const struct iovec *, int, off_t *, register_t *);
                     86: int    dofilewritev(struct proc *, int, struct file *,
                     87:            const struct iovec *, int, off_t *, register_t *);
                     88:
                     89: #endif /* !_KERNEL */
                     90:
                     91: #endif /* !_SYS_UIO_H_ */