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;   /* F_RDLCK, F_WRLCK, or F_UNLCK */
+  short l_whence; /* flag to choose starting offset */
+  long  l_start;  /* relative offset, in bytes */

[Mark Seaborn, 2013/11/08 22:32:35]

The Linux fcntl(2) man page says that l_start and l_len have type off_t (which
is 64 bits on NaCl).

This seems worth fixing in case this definition gets used later.

[Sam Clegg, 2013/11/25 19:50:25]

Done.

+  long  l_len;    /* length, in bytes; 0 means lock to EOF */
+  short l_pid;    /* returned with F_GETLK */

[Mark Seaborn, 2013/11/08 22:32:35]

The Linux fcntl(2) man page says that l_pid is of type pid_t, which I hope is 32
bits on NaCl.

[Sam Clegg, 2013/11/25 19:50:25]

Done.

+  short l_xxx;    /* reserved for future use */
+};
+
 #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