Make M-x shell work in emacs.

ports/devenv/tests/devenv_small_test.cc

 // Copyright (c) 2014 The Native Client Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gtest/gtest.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <spawn.h>
 #include <unistd.h>
 
+#define pipe nacl_spawn_pipe
+
 static char *argv0;
 
 // Make sure that the plumbing works.
 TEST(Plumbing, Identity) {
   EXPECT_EQ(0, 0);
 }
 
 // Test process functions.
 TEST(Plumbing, ProcessTests) {
   int pid = getpid();
@@ skipping 248 matching lines @@
     ASSERT_EQ(1, dup2(pipes[1], 1));
     EXPECT_EQ(0, close(pipes[0]));
     execlp(argv0, argv0, "echo", NULL);
   }
 
   EXPECT_EQ(0, close(pipes[1]));
   char check_msg[] = "test";
   char buffer[100];
   size_t total = 0;
   while (total < strlen(check_msg)) {
-    ssize_t len = read(pipes[0], buffer+total, sizeof(buffer));
+    ssize_t len = read(pipes[0], buffer + total, sizeof(buffer));
     ASSERT_GE(len, 0);
     if (len == 0) break;
     total += len;
   }
   ASSERT_EQ(0, memcmp(buffer, check_msg, total));
   EXPECT_EQ(0, close(pipes[0]));
 }
 
 // Write to an echo process, close immediately, then wait for reply.
 TEST(Pipes, PipeFastClose) {
@@ skipping 213 matching lines @@
     }
     printf("unknown child_command: %s\n", child_command);
     return 1;
   }
 
   // Preserve argv[0] for use in some tests.
   argv0 = argv[0];
   testing::InitGoogleTest(&argc, argv);
   return RUN_ALL_TESTS();
 }