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authorKevin2014-11-15 09:58:27 +0800
committerKevin2014-11-15 09:58:27 +0800
commit392e8802486cb573b916e746010e141a75f507e6 (patch)
tree50029aca02c81f087b90336e670b44e510782330 /ANDROID_3.4.5/include/linux/uio.h
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init android origin source code
Diffstat (limited to 'ANDROID_3.4.5/include/linux/uio.h')
-rw-r--r--ANDROID_3.4.5/include/linux/uio.h56
1 files changed, 56 insertions, 0 deletions
diff --git a/ANDROID_3.4.5/include/linux/uio.h b/ANDROID_3.4.5/include/linux/uio.h
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+#ifndef __LINUX_UIO_H
+#define __LINUX_UIO_H
+
+#include <linux/compiler.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.
+ */
+
+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) */
+};
+
+/*
+ * UIO_MAXIOV shall be at least 16 1003.1g (5.4.1.1)
+ */
+
+#define UIO_FASTIOV 8
+#define UIO_MAXIOV 1024
+
+#ifdef __KERNEL__
+
+struct kvec {
+ void *iov_base; /* and that should *never* hold a userland pointer */
+ size_t iov_len;
+};
+
+/*
+ * 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
+
+#endif