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#!/bin/luajit
-- basic init process
-- note we do not catch all errors as we cannot do much about them
-- note that stdin, stderr should be attached to /dev/console
package.path = "/lib/?.lua;?"
local S = require "syscall"
local nl = require "syscall.nl"
local function fatal(s)
print(s)
os.exit()
end
function try(f, ...)
local ok, err = f(...) -- could use pcall
if ok then return ok end
print("init: error at line " .. debug.getinfo(2, "l").currentline .. ": " .. tostring(err))
end
if not S then fatal("cannot find syscall library") end
-- mounts
try(S.mount, "sysfs", "/sys", "sysfs", "rw,nosuid,nodev,noexec,relatime")
try(S.mount, "proc", "/proc", "proc", "rw,nosuid,nodev,noexec,relatime")
try(S.mount, "devpts", "/dev/pts", "devpts", "rw,nosuid,noexec,relatime")
-- interfaces
local i = nl.interfaces()
local lo, eth0 = i.lo, i.eth0
lo:up()
eth0:up()
eth0:address("10.3.0.2/24")
-- hostname
S.sethostname("lua")
-- print something
local i = nl.interfaces()
print(i)
-- run processes
-- reap zombies
while true do
local w, err = S.waitpid(-1, "all")
if not w and err.ECHILD then break end -- no more children
end
-- childless
print("last child exited")
S.pause() -- for testing, normally exit
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