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Diffstat (limited to 'include/sys/uio.h')
| -rw-r--r-- | include/sys/uio.h | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/include/sys/uio.h b/include/sys/uio.h new file mode 100644 index 0000000000..56956f0150 --- /dev/null +++ b/include/sys/uio.h @@ -0,0 +1,124 @@ +/*- + * 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. + * 4. 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 + * $FreeBSD$ + */ + +#ifndef _SYS_UIO_HH_ +#define _SYS_UIO_HH_ + +#include <sys/cdefs.h> +#ifdef __rtems__ +#include <sys/types.h> +#endif /* __rtems__ */ +#include <sys/_types.h> +#include <sys/_iovec.h> + +#ifndef __rtems__ +#ifndef _SSIZE_T_DECLARED +typedef __ssize_t ssize_t; +#define _SSIZE_T_DECLARED +#endif + +#ifndef _OFF_T_DECLARED +typedef __off_t off_t; +#define _OFF_T_DECLARED +#endif +#endif /* !__rtems__ */ + +#if __BSD_VISIBLE +enum uio_rw { UIO_READ, UIO_WRITE }; + +/* Segment flag values. */ +enum uio_seg { + UIO_USERSPACE, /* from user data space */ + UIO_SYSSPACE, /* from system space */ + UIO_NOCOPY /* don't copy, already in object */ +}; +#endif + +#ifdef _KERNEL + +struct uio { + struct iovec *uio_iov; /* scatter/gather list */ + int uio_iovcnt; /* length of scatter/gather list */ + off_t uio_offset; /* offset in target object */ + ssize_t uio_resid; /* remaining bytes to process */ + enum uio_seg uio_segflg; /* address space */ + enum uio_rw uio_rw; /* operation */ + struct thread *uio_td; /* owner */ +}; + +/* + * Limits + * + * N.B.: UIO_MAXIOV must be no less than IOV_MAX from <sys/syslimits.h> + * which in turn must be no less than _XOPEN_IOV_MAX from <limits.h>. If + * we ever make this tunable (probably pointless), then IOV_MAX should be + * removed from <sys/syslimits.h> and applications would be expected to use + * sysconf(3) to find out the correct value, or else assume the worst + * (_XOPEN_IOV_MAX). Perhaps UIO_MAXIOV should be simply defined as + * IOV_MAX. + */ +#define UIO_MAXIOV 1024 /* max 1K of iov's */ + +struct vm_object; +struct vm_page; + +struct uio *cloneuio(struct uio *uiop); +int copyinfrom(const void * __restrict src, void * __restrict dst, + size_t len, int seg); +int copyiniov(struct iovec *iovp, u_int iovcnt, struct iovec **iov, + int error); +int copyinstrfrom(const void * __restrict src, void * __restrict dst, + size_t len, size_t * __restrict copied, int seg); +int copyinuio(struct iovec *iovp, u_int iovcnt, struct uio **uiop); +void uio_yield(void); +int uiomove(void *cp, int n, struct uio *uio); +int uiomove_frombuf(void *buf, int buflen, struct uio *uio); +#ifndef __rtems__ +int uiomove_fromphys(struct vm_page *ma[], vm_offset_t offset, int n, + struct uio *uio); +#endif /* !__rtems__ */ +int uiomoveco(void *cp, int n, struct uio *uio, int disposable); + +#else /* !_KERNEL */ + +__BEGIN_DECLS +ssize_t readv(int, const struct iovec *, int); +ssize_t writev(int, const struct iovec *, int); +#if __BSD_VISIBLE +ssize_t preadv(int, const struct iovec *, int, off_t); +ssize_t pwritev(int, const struct iovec *, int, off_t); +#endif +__END_DECLS + +#endif /* _KERNEL */ + +#endif /* !_SYS_UIO_HH_ */ |