Merge branch 'git-sam' into diego-sam-mwild-integration

Conflicts in options.c were just due to independent small functions
being close to each other.

unix.c in mwild was broken, it wasn't using LUASOCKET_API.

serial.c needed luaL_reg renamed, and to use LUASOCKET_API.

makefile didn't respect standard DESTDIR and prefix makefile
variables, and didn't allow LUAV variable to select lua version to build
against.

I've tested the top-level install-both target builds and installs
against both lua5.1 and lua5.2, but not done further testing.

Conflicts:
	README
	config
	gem/ltn012.tex
	makefile
	src/makefile
	src/options.c
	src/options.h
	src/tcp.c
	src/usocket.c

test/find-connect-limit

@@ -0,0 +1,32 @@
+#!/usr/bin/env lua
+--[[
+Find out how many TCP connections we can make.
+
+Use ulimit to increase the max number of descriptors:
+
+ulimit -n 10000
+ulimit -n
+
+You'll probably need to be root to do this.
+]]
+
+require "socket"
+
+host = arg[1] or "google.com"
+port = arg[2] or 80
+
+connections = {}
+
+repeat
+	c = assert(socket.connect(hostip or host, 80))
+	table.insert(connections, c)
+
+        if not hostip then
+            hostip = c:getpeername()
+            print("resolved", host, "to", hostip)
+        end
+
+	print("connection #", #connections, c, "fd", c:getfd())
+
+until false
+

test/tcp-getoptions

@@ -0,0 +1,41 @@
+#!/usr/bin/env lua
+
+require"socket"
+
+port = 8765
+
+function options(o)
+    print("options for", o)
+
+    for _, opt in ipairs{"keepalive", "reuseaddr", "tcp-nodelay"} do
+        print("getoption", opt, o:getoption(opt))
+    end
+
+    print("getoption", "linger",
+        "on", o:getoption("linger").on,
+        "timeout", o:getoption("linger").timeout)
+end
+
+local m = socket.tcp()
+
+options(m)
+
+assert(m:bind("*", port))
+assert(m:listen())
+
+options(m)
+
+m:close()
+
+local m = socket.bind("*", port)
+
+options(m)
+
+local c = socket.connect("localhost", port)
+
+options(c)
+
+local s = m:accept()
+
+options(s)
+

test/testsrvr.lua

@@ -7,7 +7,12 @@ while 1 do
     print("server: waiting for client connection...");
     control = assert(server:accept());
     while 1 do 
-        command = assert(control:receive());
+        command, emsg = control:receive();
+        if emsg == "closed" then
+            control:close()
+            break
+        end
+        assert(command, emsg)
         assert(control:send(ack));
         print(command);
 		(load(command))();

test/udp-zero-length-send

@@ -0,0 +1,25 @@
+#!/usr/bin/lua
+
+--[[
+Show that luasocket returns an error message on zero-length UDP sends,
+even though the send is valid, and in fact the UDP packet is sent
+to the peer:
+
+% sudo tcpdump -i lo -n
+tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
+listening on lo, link-type EN10MB (Ethernet), capture size 65535 bytes
+13:40:16.652808 IP 127.0.0.1.56573 > 127.0.0.1.5432: UDP, length 0
+
+]]
+
+require"socket"
+
+s = assert(socket.udp())
+r = assert(socket.udp())
+assert(r:setsockname("*", 5432))
+assert(s:setpeername("127.0.0.1", 5432))
+
+ssz, emsg = s:send("")
+
+print(ssz == 0 and "OK" or "FAIL",[[send:("")]], ssz, emsg)
+

test/udp-zero-length-send-recv

@@ -0,0 +1,37 @@
+#!/usr/bin/lua
+
+--[[
+Show that luasocket returns an error message on zero-length UDP sends,
+even though the send is valid, and in fact the UDP packet is sent
+to the peer:
+
+% sudo tcpdump -i lo -n
+tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
+listening on lo, link-type EN10MB (Ethernet), capture size 65535 bytes
+13:40:16.652808 IP 127.0.0.1.56573 > 127.0.0.1.5432: UDP, length 0
+
+]]
+
+require"socket"
+
+s = assert(socket.udp())
+r = assert(socket.udp())
+assert(r:setsockname("*", 5432))
+assert(s:setpeername("127.0.0.1", 5432))
+
+ok, emsg = s:send("")
+if ok ~= 0 then
+    print("send of zero failed with:", ok, emsg)
+end
+
+assert(r:settimeout(2))
+
+ok, emsg = r:receive()
+
+if not ok or string.len(ok) ~= 0 then
+    print("fail - receive of zero failed with:", ok, emsg)
+    os.exit(1)
+end
+
+print"ok"
+