Make M-x shell work in emacs.

ports/nacl-spawn/include/spawn.h

Index: ports/nacl-spawn/include/spawn.h
diff --git a/ports/nacl-spawn/include/spawn.h b/ports/nacl-spawn/include/spawn.h
index c08d0d7e60b870fd217e78d4bdc3c770a5fb7891..e8ad58bad913b4c4abaf5eb26d37e6f2e5226fb4 100644
--- a/ports/nacl-spawn/include/spawn.h
+++ b/ports/nacl-spawn/include/spawn.h
@@ -60,6 +60,29 @@ int spawnve(int mode, const char* path, char *const argv[], char *const envp[]);
 void jseval(const char* cmd, char** data, size_t* len);
 
 /*
+ * Create a pipe that can communicate cross-process via JS.

[Pete Williamson, 2016/02/29 20:53:47]

The fact that we are adding a new function to get the functionality that linux
already provides is an indicator that we need some later refactoring.  Can you
open a bug to later refactor and use the existing linux API call everywhere,
properly paying attention to the flags? (or fix fusefs, or whatever needs to
happen)

[bradnelson, 2016/03/03 18:04:02]

Done.

+ *
+ * Args:
+ *   pipefd: Point to place to store a read [0] and write [1] fd.
+ * Returns:
+ *   Zero on success.
+ */
+int nacl_spawn_pipe(int pipefd[2]);
+
+/*
+ * Create a pipe that can communicate cross-process via JS w/ flags.
+ *
+ * Args:
+ *   flags: Flags to create the fd's with (for example O_NONBLOCK).
+ *   pipefd: Point to place to store a read [0] and write [1] fd.
+ * Returns:
+ *   Zero on success.
+ * This is needed because currently fusefs doesn't route information
+ * about if an fd has been made O_NONBLOCK via fcntl.
+ */
+int nacl_spawn_pipe_flags(int flags, int pipefd[2]);
+
+/*
  * Implement vfork as a macro.
  *
  * Returns: