===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/ssh/atomicio.c,v
retrieving revision 1.13
retrieving revision 1.13.2.1
diff -u -r1.13 -r1.13.2.1
--- src/usr.bin/ssh/atomicio.c	2005/05/24 17:32:43	1.13
+++ src/usr.bin/ssh/atomicio.c	2006/10/06 03:19:32	1.13.2.1
@@ -1,4 +1,6 @@
+/* $OpenBSD: atomicio.c,v 1.13.2.1 2006/10/06 03:19:32 brad Exp $ */
 /*
+ * Copyright (c) 2006 Damien Miller. All rights reserved.
  * Copyright (c) 2005 Anil Madhavapeddy. All rights reserved.
  * Copyright (c) 1995,1999 Theo de Raadt.  All rights reserved.
  * All rights reserved.
@@ -24,20 +26,19 @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include "includes.h"
-RCSID("$OpenBSD: atomicio.c,v 1.13 2005/05/24 17:32:43 avsm Exp $");
+#include <sys/param.h>
+#include <sys/uio.h>
 
+#include <errno.h>
+#include <string.h>
+
 #include "atomicio.h"
 
 /*
  * ensure all of data on socket comes through. f==read || f==vwrite
  */
 size_t
-atomicio(f, fd, _s, n)
-	ssize_t (*f) (int, void *, size_t);
-	int fd;
-	void *_s;
-	size_t n;
+atomicio(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n)
 {
 	char *s = _s;
 	size_t pos = 0;
@@ -54,8 +55,60 @@
 			errno = EPIPE;
 			return pos;
 		default:
-			pos += (u_int)res;
+			pos += (size_t)res;
 		}
 	}
 	return (pos);
+}
+
+/*
+ * ensure all of data on socket comes through. f==readv || f==writev
+ */
+size_t
+atomiciov(ssize_t (*f) (int, const struct iovec *, int), int fd,
+    const struct iovec *_iov, int iovcnt)
+{
+	size_t pos = 0, rem;
+	ssize_t res;
+	struct iovec iov_array[IOV_MAX], *iov = iov_array;
+
+	if (iovcnt > IOV_MAX) {
+		errno = EINVAL;
+		return 0;
+	}
+	/* Make a copy of the iov array because we may modify it below */
+	memcpy(iov, _iov, iovcnt * sizeof(*_iov));
+
+	for (; iovcnt > 0 && iov[0].iov_len > 0;) {
+		res = (f) (fd, iov, iovcnt);
+		switch (res) {
+		case -1:
+			if (errno == EINTR || errno == EAGAIN)
+				continue;
+			return 0;
+		case 0:
+			errno = EPIPE;
+			return pos;
+		default:
+			rem = (size_t)res;
+			pos += rem;
+			/* skip completed iov entries */
+			while (iovcnt > 0 && rem >= iov[0].iov_len) {
+				rem -= iov[0].iov_len;
+				iov++;
+				iovcnt--;
+			}
+			/* This shouldn't happen... */
+			if (rem > 0 && (iovcnt <= 0 || rem > iov[0].iov_len)) {
+				errno = EFAULT;
+				return 0;
+			}
+			if (iovcnt == 0)
+				break;
+			/* update pointer in partially complete iov */
+			iov[0].iov_base = ((char *)iov[0].iov_base) + rem;
+			iov[0].iov_len -= rem;
+		}
+	}
+	return pos;
 }