ffi-open.lua

local ffi = require 'ffi'
ffi.cdef[[
	typedef int mode_t;
	char *strerror(int errnum);
	int open(const char *pathname, int flags);
	int open(const char *pathname, int flags, mode_t mode);

	ssize_t write(int fd, const char *buf, size_t count);
]]

O_RDONLY     =   00000000
O_WRONLY     =   00000001
O_RDWR       =   00000002

--local fd = ffi.C.open("testfile",0);
local fd = ffi.C.open("testfile",O_RDWR);
if fd > -1 then
	print("file opened: ",fd);
	local r = ffi.C.write(fd,"buffer\n",7);
	if r > 0 then
	else
		print("write failed", ffi.string(ffi.C.strerror(ffi.errno())));
	end
else
	print(ffi.string(ffi.C.strerror(ffi.errno())));
end