patch-1.3.16 linux/net/core/iovec.c

• Lines: 91
• Date: Tue Aug 8 09:20:36 1995
• Orig file: v1.3.15/linux/net/core/iovec.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.15/linux/net/core/iovec.c linux/net/core/iovec.c
@@ -0,0 +1,90 @@
+/*
+ *	iovec manipulation routines.
+ *
+ *
+ *		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.
+ */
+
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/net.h>
+#include <asm/segment.h>
+
+
+extern inline int min(int x, int y)
+{
+	return x>y?y:x;
+}
+
+int verify_iovec(struct msghdr *m, struct iovec *iov, char *address, int mode)
+{
+	int err=0;
+	int len=0;
+	int ct;
+	
+	if(m->msg_name!=NULL)
+	{
+		if(mode==VERIFY_READ)
+			err=move_addr_to_kernel(m->msg_name, m->msg_namelen, address);
+		else
+			err=verify_area(mode, m->msg_name, m->msg_namelen);
+		if(err<0)
+			return err;
+	}
+	if(m->msg_accrights!=NULL)
+	{
+		err=verify_area(mode, m->msg_accrights, m->msg_accrightslen);
+		if(err)
+			return err;
+	}
+	
+	for(ct=0;ct<m->msg_iovlen;ct++)
+	{
+		err=verify_area(mode, m->msg_iov[ct].iov_base, m->msg_iov[ct].iov_len);
+		if(err)
+			return err;
+		len+=m->msg_iov[ct].iov_len;
+	}
+	
+	return len;
+}
+
+/*
+ *	Copy kernel to iovec.
+ */
+ 
+void memcpy_toiovec(struct iovec *iov, unsigned char *kdata, int len)
+{
+	while(len>0)
+	{
+		memcpy_tofs(iov->iov_base, kdata,iov->iov_len);
+		kdata+=iov->iov_len;
+		len-=iov->iov_len;
+		iov++;
+	}
+}
+
+/*
+ *	Copy iovec to kernel.
+ */
+ 
+void memcpy_fromiovec(unsigned char *kdata, struct iovec *iov, int len)
+{
+	int copy;
+	while(len>0)
+	{
+		copy=min(len,iov->iov_len);
+		memcpy_fromfs(kdata, iov->iov_base, copy);
+		len-=copy;
+		kdata+=copy;
+		iov++;
+	}
+}
+