Provides some of the missing POSIX file syscalls

src/untrusted/irt/irt_filename.c

Index: src/untrusted/irt/irt_filename.c
diff --git a/src/untrusted/irt/irt_filename.c b/src/untrusted/irt/irt_filename.c
index 6e49f588c01e37cca5756d1ed31ce42e837fb8ee..10e8d4687955ad11e5660120775a0a679e7138f1 100644
--- a/src/untrusted/irt/irt_filename.c
+++ b/src/untrusted/irt/irt_filename.c
@@ -41,12 +41,63 @@ static int nacl_irt_unlink(const char *pathname) {
   return -NACL_SYSCALL(unlink)(pathname);
 }
 
+static int nacl_irt_truncate(const char *path, off_t length) {
+  return -NACL_SYSCALL(truncate)(path, length);
+}
+
+static int nacl_irt_lstat(const char *path, struct stat *buf) {
+  return -NACL_SYSCALL(lstat)(path, buf);
+}
+
+static int nacl_irt_link(const char *oldpath, const char *newpath) {
+  return -NACL_SYSCALL(link)(oldpath, newpath);
+}
+
+static int nacl_irt_rename(const char *oldpath, const char *newpath) {
+  return -NACL_SYSCALL(rename)(oldpath, newpath);
+}
+
+static int nacl_irt_symlink(const char* oldpath, const char* newpath) {
+  return -NACL_SYSCALL(symlink)(oldpath, newpath);
+}
+
+static int nacl_irt_chmod(const char *path, mode_t mode) {
+  return -NACL_SYSCALL(chmod)(path, mode);
+}
+
+static int nacl_irt_access(const char *path, int mode) {
+  return -NACL_SYSCALL(access)(path, mode);
+}
+
+static int nacl_irt_readlink(const char *path, char *buf, size_t count,
+                             size_t *nread) {
+  int rv = NACL_SYSCALL(readlink)(path, buf, count);
+  if (rv < 0)
+    return -rv;
+  *nread = rv;
+  return 0;
+}
+
+static int nacl_irt_utimes(const char* filename, const struct timeval* times) {
+  return -NACL_SYSCALL(utimes)(filename, times);
+}
+
 const struct nacl_irt_filename nacl_irt_filename = {
   nacl_irt_open,
   nacl_irt_stat,
 };
 
-const struct nacl_irt_dev_filename_v0_2 nacl_irt_dev_filename = {
+const struct nacl_irt_dev_filename_v0_2 nacl_irt_dev_filename_v0_2 = {
+  nacl_irt_open,
+  nacl_irt_stat,
+  nacl_irt_mkdir,
+  nacl_irt_rmdir,
+  nacl_irt_chdir,
+  nacl_irt_getcwd,
+  nacl_irt_unlink,
+};
+
+const struct nacl_irt_dev_filename nacl_irt_dev_filename = {
   nacl_irt_open,
   nacl_irt_stat,
   nacl_irt_mkdir,
@@ -54,4 +105,13 @@ const struct nacl_irt_dev_filename_v0_2 nacl_irt_dev_filename = {
   nacl_irt_chdir,
   nacl_irt_getcwd,
   nacl_irt_unlink,
+  nacl_irt_truncate,
+  nacl_irt_lstat,
+  nacl_irt_link,
+  nacl_irt_rename,
+  nacl_irt_symlink,
+  nacl_irt_chmod,
+  nacl_irt_access,
+  nacl_irt_readlink,
+  nacl_irt_utimes,
 };