From 08f66bc771ac798d89451a9b68a1c6722352d683 Mon Sep 17 00:00:00 2001
From: Dan Albert <danalbert@google.com>
Date: Thu, 19 Mar 2015 18:09:59 -0700
Subject: [PATCH] The generic failure case disappeared...

Was manifesting as a write to a full disk hanging indefinitely.

Bug: 19846181
Change-Id: Ia581e0bbbb331c221bdb68882c238d0cb9f8a0b3
---
 adb/adb_io.cpp      |  2 ++
 adb/adb_io_test.cpp | 12 ++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/adb/adb_io.cpp b/adb/adb_io.cpp
index 4dd9f4d02..1a746884b 100644
--- a/adb/adb_io.cpp
+++ b/adb/adb_io.cpp
@@ -79,6 +79,8 @@ bool WriteFdExactly(int fd, const void* buf, size_t len) {
                 D("writex: fd=%d disconnected\n", fd);
                 errno = 0;
                 return false;
+            } else {
+                return false;
             }
         } else {
             len -= r;
diff --git a/adb/adb_io_test.cpp b/adb/adb_io_test.cpp
index 0c69bc94b..da340b237 100644
--- a/adb/adb_io_test.cpp
+++ b/adb/adb_io_test.cpp
@@ -18,8 +18,11 @@
 
 #include <gtest/gtest.h>
 
+#include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <sys/stat.h>
+#include <sys/types.h>
 #include <unistd.h>
 
 #include <string>
@@ -127,6 +130,15 @@ TEST(io, WriteFdExactly_partial) {
   EXPECT_EQ(expected, s);
 }
 
+TEST(io, WriteFdExactly_ENOSPC) {
+    int fd = open("/dev/full", O_WRONLY);
+    ASSERT_NE(-1, fd);
+
+    char buf[] = "foo";
+    ASSERT_FALSE(WriteFdExactly(fd, buf, sizeof(buf)));
+    ASSERT_EQ(ENOSPC, errno);
+}
+
 TEST(io, WriteStringFully) {
   const char str[] = "Foobar";
   TemporaryFile tf;