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-- Linux cgroup API
-- this is all file system operations packaged up to be easier to use
local require, error, assert, tonumber, tostring,
setmetatable, pairs, ipairs, unpack, rawget, rawset,
pcall, type, table, string =
require, error, assert, tonumber, tostring,
setmetatable, pairs, ipairs, unpack, rawget, rawset,
pcall, type, table, string
local function init(S)
local h = require "syscall.helpers"
local split = h.split
local abi, types, c = S.abi, S.types, S.c
local t, pt, s = types.t, types.pt, types.s
local util = S.util
local cgroup = {}
local function mkgroup(name)
-- append default location, should be tmpfs mount
if name:sub(1, 1) ~= "/" then return "/sys/fs/cgroup" .. name else return name end
end
function cgroup.mount(tab)
tab.source = tab.source or "cgroup"
tab.type = "cgroup"
tab.target = mkgroup(tab.target)
return S.mount(tab)
end
function cgroup.cgroups(ps)
ps = tostring(ps or "self")
local cgf = util.readfile("/proc/" .. ps .. "/cgroup")
local lines = split("\n", cgf)
local cgroups = {}
for i = 1, #lines - 1 do
local parts = split( ":", lines[i])
cgroups[parts[1]] = {name = parts[2], path = parts[3]}
end
return cgroups
end
return cgroup
end
return {init = init}
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