Provide IRT process interface

src/untrusted/nacl/pipe.c

Index: src/untrusted/nacl/pipe.c
diff --git a/src/untrusted/nacl/fsync.c b/src/untrusted/nacl/pipe.c
similarity index 66%
copy from src/untrusted/nacl/fsync.c
copy to src/untrusted/nacl/pipe.c
index a7d725698600b93e96c6c3c0239fe2b3b20bfb11..337245ee7552b2f77dce53fbb7184f6288b89d81 100644
--- a/src/untrusted/nacl/fsync.c
+++ b/src/untrusted/nacl/pipe.c
@@ -7,15 +7,13 @@
 #include <errno.h>
 #include <unistd.h>
 
-#include "native_client/src/untrusted/nacl/nacl_irt.h"
-
-int fsync(int fd) {
-  if (!__libnacl_irt_init_fn(&__libnacl_irt_dev_fdio.fsync,
+int pipe(int fd[2]) {
+  if (!__libnacl_irt_init_fn(&__libnacl_irt_dev_fdio.pipe,
                              __libnacl_irt_dev_fdio_init)) {
     return -1;
   }
 
-  int error = __libnacl_irt_dev_fdio.fsync(fd);
+  int error = __libnacl_irt_dev_fdio.pipe(fd);
   if (error) {
     errno = error;
     return -1;