upgrade atomicio

in order to remove K&R code in atomicio.c

now, vwrite comes from atomicio.h

atomicio.c

+/* $OpenBSD: atomicio.c,v 1.17 2006/04/01 05:51:34 djm Exp $ */
 /*
- * Copied from OpenSSH 3.6.1p2.
+ * Copied from OpenSSH/OpenBSD.
  * 
+ * Copyright (c) 2005 Anil Madhavapeddy. All rights reserved.
  * Copyright (c) 1995,1999 Theo de Raadt.  All rights reserved.
  * All rights reserved.
  *
@@ -25,39 +27,32 @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-/* RCSID("OpenBSD: atomicio.c,v 1.10 2001/05/08 22:48:07 markus Exp "); */
+#include "includes.h"
 
 #include "atomicio.h"
 
 /*
- * ensure all of data on socket comes through. f==read || f==write
+ * ensure all of data on socket comes through. f==read || f==vwrite
  */
-ssize_t
-atomicio(f, fd, _s, n)
-	ssize_t (*f) ();
-	int fd;
-	void *_s;
-	size_t n;
+size_t
+atomicio(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n)
 {
 	char *s = _s;
-	ssize_t res;
 	size_t pos = 0;
+	ssize_t res;
 
 	while (n > pos) {
 		res = (f) (fd, s + pos, n - pos);
 		switch (res) {
 		case -1:
-#ifdef EWOULDBLOCK
-			if (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)
-#else
 			if (errno == EINTR || errno == EAGAIN)
-#endif
 				continue;
-			/* FALLTHROUGH */
+			return 0;
 		case 0:
-			return (res);
+			errno = EPIPE;
+			return pos;
 		default:
-			pos += res;
+			pos += (size_t)res;
 		}
 	}
 	return (pos);

atomicio.h

+/* $OpenBSD: atomicio.h,v 1.7 2006/03/25 22:22:42 djm Exp $ */
 
 /*
- * Copied from OpenSSH 3.6.1p2, required for loginrec.c
- *
- * $OpenBSD: atomicio.h,v 1.4 2001/06/26 06:32:46 itojun Exp $
+ * Copied from OpenSSH/OpenBSD, required for loginrec.c
  *
  * Copyright (c) 1995,1999 Theo de Raadt.  All rights reserved.
  * All rights reserved.
@@ -28,9 +27,9 @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include "includes.h"
-
 /*
- * Ensure all of data on socket comes through. f==read || f==write
+ * Ensure all of data on socket comes through. f==read || f==vwrite
  */
-ssize_t	atomicio(ssize_t (*)(), int, void *, size_t);
+size_t	atomicio(ssize_t (*)(int, void *, size_t), int, void *, size_t);
+
+#define vwrite (ssize_t (*)(int, void *, size_t))write

cli-agentfwd.c

@@ -130,7 +130,7 @@ static buffer * agent_request(unsigned char type, buffer *data) {
 	}
 	buf_setpos(payload, 0);
 
-	ret = atomicio(write, fd, buf_getptr(payload, payload->len), payload->len);
+	ret = atomicio(vwrite, fd, buf_getptr(payload, payload->len), payload->len);
 	if ((size_t)ret != payload->len) {
 		TRACE(("write failed fd %d for agent_request, %s", fd, strerror(errno)))
 		goto out;

loginrec.c

@@ -706,7 +706,7 @@ utmp_write_direct(struct logininfo *li, struct utmp *ut)
 		}
 
 		(void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET);
-		if (atomicio(write, fd, ut, sizeof(*ut)) != sizeof(*ut))
+		if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut))
 			dropbear_log(LOG_WARNING, "utmp_write_direct: error writing %s: %s",
 			    UTMP_FILE, strerror(errno));
 
@@ -895,7 +895,7 @@ wtmp_write(struct logininfo *li, struct utmp *ut)
 		return 0;
 	}
 	if (fstat(fd, &buf) == 0)
-		if (atomicio(write, fd, ut, sizeof(*ut)) != sizeof(*ut)) {
+		if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) {
 			ftruncate(fd, buf.st_size);
 			dropbear_log(LOG_WARNING, "wtmp_write: problem writing %s: %s",
 			    WTMP_FILE, strerror(errno));
@@ -1062,7 +1062,7 @@ wtmpx_write(struct logininfo *li, struct utmpx *utx)
 	}
 
 	if (fstat(fd, &buf) == 0)
-		if (atomicio(write, fd, utx, sizeof(*utx)) != sizeof(*utx)) {
+		if (atomicio(vwrite, fd, utx, sizeof(*utx)) != sizeof(*utx)) {
 			ftruncate(fd, buf.st_size);
 			dropbear_log(LOG_WARNING, "wtmpx_write: problem writing %s: %s",
 			    WTMPX_FILE, strerror(errno));
@@ -1351,7 +1351,7 @@ lastlog_perform_login(struct logininfo *li)
 		return(0);
 
 	/* write the entry */
-	if (atomicio(write, fd, &last, sizeof(last)) != sizeof(last)) {
+	if (atomicio(vwrite, fd, &last, sizeof(last)) != sizeof(last)) {
 		close(fd);
 		dropbear_log(LOG_WARNING, "lastlog_write_filemode: Error writing to %s: %s",
 		    LASTLOG_FILE, strerror(errno));

scpmisc.h

@@ -12,9 +12,6 @@
  * called by a name other than "ssh" or "Secure Shell".
  */
 
-/* actually from atomicio, but is only used in scp code */
-#define vwrite (ssize_t (*)(int, void *, size_t))write
-
 char	*chop(char *);
 char	*strdelim(char **);
 void	 set_nonblock(int);