Provide IRT process interface

src/untrusted/nacl/wait.c

Index: src/untrusted/nacl/wait.c
diff --git a/src/untrusted/nacl/wait.c b/src/untrusted/nacl/wait.c
new file mode 100644
index 0000000000000000000000000000000000000000..5a890ab7b01046bd5439dcbf64bda80657ec0b2d
--- /dev/null
+++ b/src/untrusted/nacl/wait.c
@@ -0,0 +1,30 @@
+/*
+ * Copyright 2010 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 <sys/types.h>
+#include <sys/wait.h>
+#include <errno.h>
+
+#include "native_client/src/untrusted/nacl/nacl_irt.h"
+
+pid_t wait(int *status) {
+  if (__libnacl_irt_dev_process.wait == NULL) {
+    __libnacl_irt_process_init();
+    if (__libnacl_irt_dev_process.wait == NULL) {
+      errno = ENOSYS;
+      return -1;
+    }
+  }
+
+  pid_t pid;
+  int error = __libnacl_irt_dev_process.wait(&pid, status);
+  if (error) {
+    errno = error;
+    return -1;
+  }
+
+  return pid;
+}