Add struct flock to newlib fcntl.h.

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

Index: src/trusted/service_runtime/include/sys/fcntl.h
diff --git a/src/trusted/service_runtime/include/sys/fcntl.h b/src/trusted/service_runtime/include/sys/fcntl.h
index fce6b0e9b280bb707c6c002b4085eb9f0346436d..cb4715eb00dd3771eea1e6eee7e2ee8e92b1dd13 100644
--- a/src/trusted/service_runtime/include/sys/fcntl.h
+++ b/src/trusted/service_runtime/include/sys/fcntl.h
@@ -67,6 +67,16 @@
 #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 */