Add sys/file.h constants

src/unix/redox/mod.rs

@@ -533,6 +533,12 @@ pub const SA_RESTART: ::c_ulong = 0x10000000;
 pub const SA_NODEFER: ::c_ulong = 0x40000000;
 pub const SA_RESETHAND: ::c_ulong = 0x80000000;
 
+// sys/file.h
+pub const LOCK_SH: ::c_int = 1;
+pub const LOCK_EX: ::c_int = 2;
+pub const LOCK_NB: ::c_int = 4;
+pub const LOCK_UN: ::c_int = 8;
+
 // sys/epoll.h
 pub const EPOLL_CLOEXEC: ::c_int = 0x0100_0000;
 pub const EPOLL_CTL_ADD: ::c_int = 1;