Add struct flock to newlib fcntl.h.

src/trusted/service_runtime/include/sys/fcntl.h

 /*
  * 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.
  */
 
 /*
  * NaCl Service Runtime API.
  */
 
@@ skipping 49 matching lines @@
 
 /* fcntl(2) flags (l_type field of flock structure) */
 #define NACL_ABI_F_RDLCK   1 /* read lock */
 #define NACL_ABI_F_WRLCK   2 /* write lock */
 #define NACL_ABI_F_UNLCK   3 /* remove lock(s) */
 #ifndef _POSIX_SOURCE
 #define NACL_ABI_F_UNLKSYS 4 /* remove remote locks for a given system */
 #endif  /* !_POSIX_SOURCE */
 
 #ifdef __native_client__
+/* file segment locking set data type - information passed to system by user */
+struct flock {
+  short l_type;
+  short l_whence;
+  off_t l_start;
+  off_t l_len;
+  pid_t l_pid;
+};
+
 #ifdef __cplusplus
 extern "C" {
 #endif  /* __cplusplus */
 
 extern int open(const char *file, int oflag, ...);
 extern int fcntl(int, int, ...);
 
 #ifdef __cplusplus
 }  /* extern "C" */
 #endif  /* __cplusplus */
 #endif  /* __native_client__ */
 
 #endif