Add and use CheckedReadFD(), CheckedWriteFD(), and CheckedReadFDAtEOF()

util/test/multiprocess_test.cc

Index: util/test/multiprocess_test.cc
diff --git a/util/test/multiprocess_test.cc b/util/test/multiprocess_test.cc
index 167f6475d4661bbcaba7bd6ca35e09d56a381f80..aab0181b1f1e40260b38585e00cee268131b4100 100644
--- a/util/test/multiprocess_test.cc
+++ b/util/test/multiprocess_test.cc
@@ -21,7 +21,6 @@
 #include "base/basictypes.h"
 #include "gtest/gtest.h"
 #include "util/file/fd_io.h"
-#include "util/test/errors.h"
 
 namespace {
 
@@ -38,40 +37,31 @@ class TestMultiprocess final : public Multiprocess {
   virtual void MultiprocessParent() override {
     int read_fd = ReadPipeFD();
     char c;
-    ssize_t rv = ReadFD(read_fd, &c, 1);
-    ASSERT_EQ(1, rv) << ErrnoMessage("read");
+    CheckedReadFD(read_fd, &c, 1);
     EXPECT_EQ('M', c);
 
     pid_t pid;
-    rv = ReadFD(read_fd, &pid, sizeof(pid));
-    ASSERT_EQ(static_cast<ssize_t>(sizeof(pid)), rv) << ErrnoMessage("read");
+    CheckedReadFD(read_fd, &pid, sizeof(pid));
     EXPECT_EQ(pid, ChildPID());
 
-    int write_fd = WritePipeFD();
     c = 'm';
-    rv = WriteFD(write_fd, &c, 1);
-    ASSERT_EQ(1, rv) << ErrnoMessage("write");
+    CheckedWriteFD(WritePipeFD(), &c, 1);
 
     // The child will close its end of the pipe and exit. Make sure that the
     // parent sees EOF.
-    rv = ReadFD(read_fd, &c, 1);
-    ASSERT_EQ(0, rv) << ErrnoMessage("read");
+    CheckedReadFDAtEOF(read_fd);
   }
 
   virtual void MultiprocessChild() override {
     int write_fd = WritePipeFD();
 
     char c = 'M';
-    ssize_t rv = WriteFD(write_fd, &c, 1);
-    ASSERT_EQ(1, rv) << ErrnoMessage("write");
+    CheckedWriteFD(write_fd, &c, 1);
 
     pid_t pid = getpid();
-    rv = WriteFD(write_fd, &pid, sizeof(pid));
-    ASSERT_EQ(static_cast<ssize_t>(sizeof(pid)), rv) << ErrnoMessage("write");
+    CheckedWriteFD(write_fd, &pid, sizeof(pid));
 
-    int read_fd = ReadPipeFD();
-    rv = ReadFD(read_fd, &c, 1);
-    ASSERT_EQ(1, rv) << ErrnoMessage("read");
+    CheckedReadFD(ReadPipeFD(), &c, 1);
     EXPECT_EQ('m', c);
   }