From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- include/linux/uio.h | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) create mode 100644 include/linux/uio.h (limited to 'include/linux/uio.h') diff --git a/include/linux/uio.h b/include/linux/uio.h new file mode 100644 index 000000000000..9af8bbcd8963 --- /dev/null +++ b/include/linux/uio.h @@ -0,0 +1,66 @@ +#ifndef __LINUX_UIO_H +#define __LINUX_UIO_H + +#include +#include + +/* + * Berkeley style UIO structures - Alan Cox 1994. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + + +/* A word of warning: Our uio structure will clash with the C library one (which is now obsolete). Remove the C + library one from sys/uio.h if you have a very old library set */ + +struct iovec +{ + void __user *iov_base; /* BSD uses caddr_t (1003.1g requires void *) */ + __kernel_size_t iov_len; /* Must be size_t (1003.1g) */ +}; + +#ifdef __KERNEL__ + +struct kvec { + void *iov_base; /* and that should *never* hold a userland pointer */ + size_t iov_len; +}; + +#endif + +/* + * UIO_MAXIOV shall be at least 16 1003.1g (5.4.1.1) + */ + +#define UIO_FASTIOV 8 +#define UIO_MAXIOV 1024 +#if 0 +#define UIO_MAXIOV 16 /* Maximum iovec's in one operation + 16 matches BSD */ + /* Beg pardon: BSD has 1024 --ANK */ +#endif + +/* + * Total number of bytes covered by an iovec. + * + * NOTE that it is not safe to use this function until all the iovec's + * segment lengths have been validated. Because the individual lengths can + * overflow a size_t when added together. + */ +static inline size_t iov_length(const struct iovec *iov, unsigned long nr_segs) +{ + unsigned long seg; + size_t ret = 0; + + for (seg = 0; seg < nr_segs; seg++) + ret += iov[seg].iov_len; + return ret; +} + +unsigned long iov_shorten(struct iovec *iov, unsigned long nr_segs, size_t to); + +#endif -- cgit v1.2.3