uio.h
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上传日期:2013-04-10
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- #ifndef __LINUX_UIO_H
- #define __LINUX_UIO_H
- #include <linux/types.h>
- /*
- * 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 *iov_base; /* BSD uses caddr_t (1003.1g requires void *) */
- __kernel_size_t iov_len; /* Must be size_t (1003.1g) */
- };
- /*
- * 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
- #endif