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Date:      Mon, 2 Jul 2012 09:53:57 +0000 (UTC)
From:      Konstantin Belousov <kib@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r237988 - head/usr.bin/xinstall
Message-ID:  <201207020953.q629rvF4062030@svn.freebsd.org>
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Author: kib
Date: Mon Jul  2 09:53:57 2012
New Revision: 237988
URL: http://svn.freebsd.org/changeset/base/237988

Log:
  Issue proper diagnostic on the short writes, also consider the
  case of write reporting 0 bytes as short write.
  
  Reported and tested by:	adreast
  MFC after:   1 week

Modified:
  head/usr.bin/xinstall/xinstall.c

Modified: head/usr.bin/xinstall/xinstall.c
==============================================================================
--- head/usr.bin/xinstall/xinstall.c	Mon Jul  2 09:53:08 2012	(r237987)
+++ head/usr.bin/xinstall/xinstall.c	Mon Jul  2 09:53:57 2012	(r237988)
@@ -55,6 +55,7 @@ __FBSDID("$FreeBSD$");
 #include <grp.h>
 #include <paths.h>
 #include <pwd.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -671,11 +672,18 @@ copy(int from_fd, const char *from_name,
 	if (size <= 8 * 1048576 && trymmap(from_fd) &&
 	    (p = mmap(NULL, (size_t)size, PROT_READ, MAP_SHARED,
 		    from_fd, (off_t)0)) != (char *)MAP_FAILED) {
-		if ((nw = write(to_fd, p, size)) != size) {
+		nw = write(to_fd, p, size);
+		if (nw != size) {
 			serrno = errno;
 			(void)unlink(to_name);
-			errno = nw > 0 ? EIO : serrno;
-			err(EX_OSERR, "%s", to_name);
+			if (nw >= 0) {
+				errx(EX_OSERR,
+     "short write to %s: %jd bytes written, %jd bytes asked to write",
+				    to_name, (uintmax_t)nw, (uintmax_t)size);
+			} else {
+				errno = serrno;
+				err(EX_OSERR, "%s", to_name);
+			}
 		}
 		done_copy = 1;
 	}
@@ -684,8 +692,15 @@ copy(int from_fd, const char *from_name,
 			if ((nw = write(to_fd, buf, nr)) != nr) {
 				serrno = errno;
 				(void)unlink(to_name);
-				errno = nw > 0 ? EIO : serrno;
-				err(EX_OSERR, "%s", to_name);
+				if (nw >= 0) {
+					errx(EX_OSERR,
+     "short write to %s: %jd bytes written, %jd bytes asked to write",
+					    to_name, (uintmax_t)nw,
+					    (uintmax_t)size);
+				} else {
+					errno = serrno;
+					err(EX_OSERR, "%s", to_name);
+				}
 			}
 		if (nr != 0) {
 			serrno = errno;

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