From f36aa3f1cc01b596038530abf77fcdb29ba5acfc Mon Sep 17 00:00:00 2001
From: daurnimator <quae@daurnimator.com>
Date: Sat, 11 Mar 2017 15:00:32 +1100
Subject: [PATCH] luatz/gettime: Use lunix if available

---
 doc/gettime.md    |  7 ++++---
 luatz/gettime.lua | 49 +++++++++++++++++++++++++++++------------------
 2 files changed, 34 insertions(+), 22 deletions(-)

diff --git a/doc/gettime.md b/doc/gettime.md
index a31e5a0..3550577 100644
--- a/doc/gettime.md
+++ b/doc/gettime.md
@@ -4,9 +4,10 @@ A module to get the current time.
 
 Uses the most precise method available (in order:)
 
-  - Use [ljsyscall](http://www.myriabit.com/ljsyscall/) to access
-  	  - `clock_gettime(2)` called with `CLOCK_REALTIME`
-  	  - `gettimeofday(2)`
+  - Use [ljsyscall](http://www.myriabit.com/ljsyscall/) to access `clock_gettime(2)` called with `CLOCK_REALTIME`
+  - [lunix](http://25thandclement.com/~william/projects/lunix.html)'s `unix.clock_gettime()` (Only on non-Apple systems)
+  - Use [ljsyscall](http://www.myriabit.com/ljsyscall/) to access `gettimeofday(2)`
+  - [lunix](http://25thandclement.com/~william/projects/lunix.html)'s `unix.gettimeofday()`
   - [luasocket](http://w3.impa.br/~diego/software/luasocket/)'s `socket.gettime`
   - [Openresty](http://openresty.org/)'s [`ngx.now`](http://wiki.nginx.org/HttpLuaModule#ngx.now)
   - [`os.time`](http://www.lua.org/manual/5.3/manual.html#pdf-os.time)
diff --git a/luatz/gettime.lua b/luatz/gettime.lua
index b5dec5a..d3eee80 100644
--- a/luatz/gettime.lua
+++ b/luatz/gettime.lua
@@ -2,27 +2,38 @@ local _M = { }
 
 _M.source , _M.resolution , _M.gettime = (function()
 	local has_syscall , syscall = pcall ( require , "syscall" )
-	if has_syscall then
-		if syscall.clock_gettime and syscall.c.CLOCK then
-			local clock_id = syscall.c.CLOCK.REALTIME
-			local function timespec_to_number ( timespec )
-				return tonumber ( timespec.tv_sec ) + tonumber ( timespec.tv_nsec ) * 1e-9
-			end
-			return "syscall.clock_gettime(CLOCK_REALTIME)" ,
-				syscall.clock_getres and timespec_to_number ( syscall.clock_getres ( clock_id ) ) or 1e-9 ,
-				function ( )
-					return timespec_to_number ( syscall.clock_gettime ( clock_id ) )
-				end
-
-		elseif syscall.gettimeofday then
-			local function timeval_to_number ( timeval )
-				return tonumber ( timeval.tv_sec ) + tonumber ( timeval.tv_nsec ) * 1e-6
+	if has_syscall and syscall.clock_gettime and syscall.c.CLOCK then
+		local clock_id = syscall.c.CLOCK.REALTIME
+		local function timespec_to_number ( timespec )
+			return tonumber ( timespec.tv_sec ) + tonumber ( timespec.tv_nsec ) * 1e-9
+		end
+		return "syscall.clock_gettime(CLOCK_REALTIME)" ,
+			syscall.clock_getres and timespec_to_number ( syscall.clock_getres ( clock_id ) ) or 1e-9 ,
+			function ( )
+				return timespec_to_number ( syscall.clock_gettime ( clock_id ) )
 			end
-			return "syscall.gettimeofday()" , 1e-6 ,
-				function ( )
-					return timeval_to_number ( syscall.gettimeofday ( ) )
-				end
+	end
+
+	local has_unix , unix = pcall ( require , "unix" )
+	-- On Apple devices lunix only uses gettimeofday()
+	if has_unix and unix.clock_gettime and unix.uname and unix.uname().sysname ~= "Darwin" then
+		return "unix.clock_gettime(CLOCK_REALTIME)" , 1e-9 , function ( )
+			return unix.clock_gettime ( )
+		end
+	end
+
+	if has_syscall and syscall.gettimeofday then
+		local function timeval_to_number ( timeval )
+			return tonumber ( timeval.tv_sec ) + tonumber ( timeval.tv_nsec ) * 1e-6
 		end
+		return "syscall.gettimeofday()" , 1e-6 ,
+			function ( )
+				return timeval_to_number ( syscall.gettimeofday ( ) )
+			end
+	end
+
+	if has_unix and unix.gettimeofday then
+		return "unix.gettimeofday()", 1e-6, unix.gettimeofday
 	end
 
 	local has_socket , socket = pcall ( require , "socket" )
-- 
2.39.2