Provides some of the missing POSIX file syscalls

src/untrusted/irt/irt_fdio.c

 /*
  * Copyright (c) 2011 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 "native_client/src/untrusted/irt/irt.h"
+#include "native_client/src/untrusted/irt/irt_dev.h"
 #include "native_client/src/untrusted/nacl/syscall_bindings_trampoline.h"
 
 static int nacl_irt_close(int fd) {
   return -NACL_SYSCALL(close)(fd);
 }
 
 static int nacl_irt_read(int fd, void *buf, size_t count, size_t *nread) {
   int rv = NACL_GC_WRAP_SYSCALL(NACL_SYSCALL(read)(fd, buf, count));
   if (rv < 0)
     return -rv;
@@ skipping 39 matching lines @@
 
 static int nacl_irt_getdents(int fd, struct dirent *buf, size_t count,
                              size_t *nread) {
   int rv = NACL_GC_WRAP_SYSCALL(NACL_SYSCALL(getdents)(fd, buf, count));
   if (rv < 0)
     return -rv;
   *nread = rv;
   return 0;
 }
 
+static int nacl_irt_fchdir(int fd) {
+  return -NACL_SYSCALL(fchdir)(fd);
+}
+
+static int nacl_irt_fchmod(int fd, mode_t mode) {
+  return -NACL_SYSCALL(fchmod)(fd, mode);
+}
+
+static int nacl_irt_fsync(int fd) {
+  return -NACL_SYSCALL(fsync)(fd);
+}
+
+static int nacl_irt_fdatasync(int fd) {
+  return -NACL_SYSCALL(fdatasync)(fd);
+}
+
+static int nacl_irt_ftruncate(int fd, off_t length) {
+  return -NACL_SYSCALL(ftruncate)(fd, length);
+}
+
 const struct nacl_irt_fdio nacl_irt_fdio = {
   nacl_irt_close,
   nacl_irt_dup,
   nacl_irt_dup2,
   nacl_irt_read,
   nacl_irt_write,
   nacl_irt_seek,
   nacl_irt_fstat,
   nacl_irt_getdents,
 };
+
+const struct nacl_irt_dev_fdio nacl_irt_dev_fdio = {
+  nacl_irt_close,
+  nacl_irt_dup,
+  nacl_irt_dup2,
+  nacl_irt_read,
+  nacl_irt_write,
+  nacl_irt_seek,
+  nacl_irt_fstat,
+  nacl_irt_getdents,
+  nacl_irt_fchdir,
+  nacl_irt_fchmod,
+  nacl_irt_fsync,
+  nacl_irt_fdatasync,
+  nacl_irt_ftruncate,
+};