Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Berkeley style UIO structures - Alan Cox 1994. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | */ | |
607ca46e DH |
9 | #ifndef __LINUX_UIO_H |
10 | #define __LINUX_UIO_H | |
1da177e4 | 11 | |
607ca46e | 12 | #include <uapi/linux/uio.h> |
1da177e4 | 13 | |
812ed032 JS |
14 | |
15 | struct kvec { | |
16 | void *iov_base; /* and that should *never* hold a userland pointer */ | |
17 | size_t iov_len; | |
18 | }; | |
19 | ||
1da177e4 LT |
20 | /* |
21 | * Total number of bytes covered by an iovec. | |
22 | * | |
23 | * NOTE that it is not safe to use this function until all the iovec's | |
24 | * segment lengths have been validated. Because the individual lengths can | |
25 | * overflow a size_t when added together. | |
26 | */ | |
27 | static inline size_t iov_length(const struct iovec *iov, unsigned long nr_segs) | |
28 | { | |
29 | unsigned long seg; | |
30 | size_t ret = 0; | |
31 | ||
32 | for (seg = 0; seg < nr_segs; seg++) | |
33 | ret += iov[seg].iov_len; | |
34 | return ret; | |
35 | } | |
36 | ||
37 | unsigned long iov_shorten(struct iovec *iov, unsigned long nr_segs, size_t to); | |
d2f83e90 RR |
38 | |
39 | int memcpy_fromiovec(unsigned char *kdata, struct iovec *iov, int len); | |
40 | int memcpy_toiovec(struct iovec *iov, unsigned char *kdata, int len); | |
812ed032 | 41 | #endif |