luaposix 36.3 Reference

## socket.lua

    #! /usr/bin/env lua

    local M = require 'posix.sys.socket'

    local sig = require 'posix.signal'
    sig.signal(sig.SIGPIPE, function() print 'pipe' end)

    -- Get Lua web site title
    local r, err = M.getaddrinfo('www.lua.org', 'http', {family=M.AF_INET, socktype=M.SOCK_STREAM})
    if not r then
       error(err)
    end

    local fd = M.socket(M.AF_INET, M.SOCK_STREAM, 0)
    local ok, err, e = M.connect(fd, r[1])
    local sa = M.getsockname(fd)
    print('Local socket bound to ' .. sa.addr .. ':' .. tostring(sa.port))
    if err then
       error(err)
    end

    M.send(fd, 'GET / HTTP/1.0\r\nHost: www.lua.org\r\n\r\n')
    local data = {}
    while true do
       local b = M.recv(fd, 1024)
       if not b or #b == 0 then
          break
       end
       table.insert(data, b)
    end
    require 'posix.unistd'.close(fd)

    data = table.concat(data)
    print(string.match(data, '<TITLE>(.+)</TITLE>'))

    -- Loopback UDP test, IPV4 and IPV6
    local fd = M.socket(M.AF_INET6, M.SOCK_DGRAM, 0)
    M.bind(fd, {family=M.AF_INET6, addr='::', port=9999})
    M.sendto(fd, 'Test ipv4', {family=M.AF_INET, addr='127.0.0.1', port=9999})
    M.sendto(fd, 'Test ipv6', {family=M.AF_INET6, addr='::', port=9999})
    for i = 1, 2 do
       local ok, r = M.recvfrom(fd, 1024)
       if ok then
          print(ok, r.addr, r.port)
       else
          print(ok, r)
       end
    end
    require 'posix.unistd'.close(fd)

    os.exit(0)

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