From: daurnimator <quae@daurnimator.com>
Date: Tue, 7 Mar 2017 23:49:28 +0000 (+1100)
Subject: luatz/gettime: Check that CLOCK constants exist
X-Git-Url: https://git.madduck.net/etc/awesome.git/commitdiff_plain/31acfe7a5fe499c1698ae23ada97519b4b262469

luatz/gettime: Check that CLOCK constants exist

ljsyscall can end up defining a clock_gettime function without defining clock symbols.
Closes #11
---

diff --git a/luatz/gettime.lua b/luatz/gettime.lua
index e0da6b4..b5dec5a 100644
--- a/luatz/gettime.lua
+++ b/luatz/gettime.lua
@@ -3,7 +3,7 @@ local _M = { }
 _M.source , _M.resolution , _M.gettime = (function()
 	local has_syscall , syscall = pcall ( require , "syscall" )
 	if has_syscall then
-		if syscall.clock_gettime 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