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README.developers
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README for developers
Refer to BUGS for a list of defects
Refer to PROJECTS for a list of future changes
New Developer Familiarisation Documentation
by Jeffrey Nowakowski, 27th March 2000
with edits by James Cameron, 10th October 2002
with edits by Zachary Uram, 25th October 2002
Setting up a Build Environment
using a Debian system is easiest, since the other developers use
that. It can be a virtual machine using VMware or Qemu or
something else.
you need certain build tools, look at Build-Depends in
debian/control for ideas.
apt-get install build-essential libtool autoconf automake po-debconf
you need certain software dependencies, again look at
Build-Depends in debian/control for ideas.
apt-get install libgdbm-dev libncurses5-dev libx11-dev \
libxt-dev libglib1.2-dev libgmp3-dev
test that a build completes using tests/build
Source Structure
ntserv/ contains the daemon process,
ntserv/ contains the per-player ntserv process code,
ntserv/ also contains libnetrek source code. To add a new object
module to libnetrek, add it to the L_OBJS variable in
ntserv/Makefile.in, reconfigure, then compile.
tools/ contains general purpose server administration tools.
other directories contain other tools that are large enough to
justify their own tree.
Server Processes
netrekd
(aka newstartd) Listens for incoming clients that want to
connect to the server. Reads the .ports file which tells it
what programs to run when a client connects. Normally, it forks
an ntserv process for each client, but it also handles other things
such as the player list for the metaserver.
ntserv
Communicates with the client. It will start as a daemon
process if shared memory doesn't exist, or if there are no
free shared memory segments. Each player has their own
associated ntserv process.
daemon
This process maintains the game state. It can start robots
such as hockey if sysdef option is set. It sends data to the
metaserver if the metaservers file is configured properly.
Shared Memory
Contains the game state. This is updated by both ntserv and the
daemon. It isn't touched by newstartd, all queueing is handled by
ntserv. Use 'ipcs' command to see if the shared memory segment is
present in the operating system.
Globals
data.c/h: Holds global data only for ntserv. Lotsa crap. These
are variables shared within a program, not between processes.
Queues
Implemented using struct queue, managed by queue.c
Robots
Started through sysdef when the server starts, through a player
vote, practice request, or out-of-t take. Either daemon or ntserv
will start them.
If through sysdef, the daemon forks the robot when daemon is
started.
If through a vote, the robot is forked at the time of the vote.
Both the daemon and the robot run at the same time. The daemon
handles the general game engine (moving players, firing weapons,
etc). The robot then handles extra things like keeping track of
the game clock, or modifies the behavior of the game by messing
with the shared memory (like in hockey).
Configuring the server
Game speed, useful to change for testing
UPDATE in sysdef
REALITY in sysdef
sysdef
Read on server startup. readsysdefaults() in
ntserv/daemon.c, ntserv/main.c. To add a new option to
sysdef, see the instructions in include/sysdefaults.h
features
config.h.in
#defines
ntserv/defs.h
#defines
keycomp/defs.h
Same as ntserv/defs.h, but SURREND=5 instead of 4? Should be
link to ntserv instead? What is keycomp/ used for?
getship.c
Contains ship stats. How does SHIP in sysdefs affect?
Messages
see also command_questions.txt [?? - james]
messages are handled by ntserv. daemon doesn't touch them.
robots need to handle messages to check commands (using
gencmds.c).
socket.c, parseIgnore(): takes care of :D (ignore doosh mess), :M
(ignore multi-line macro, pig call (5 spaces sent to yerself), and
:[ita] messages (ignore player).
Sample Scenario
Short packets?
TCP/IP
UDP
Player A shoots a torp: Packet arrives, handled by ntserv, which
allocates a torp struct entry, daemon moves torp coordinates at
game reality update rate, ntserv's deliver torp update packets to
all players who can 'see' the torp.
Debugging/Error Messages
ERRORS (why no date?), stdout/err for different processes. ERRORS
not usable in all processes? ERROR() doesn't seem to work in
robots (puck, basep, etc); perror() does though.
--
Data Structures
+----------------------------------------+
| struct player players[MAXPLAYER]; |---+
+----------------------------------------+ |
| | |
| struct player players[0]; <--------------+
| struct player players[1]; |
+-----------+ | |
| me->p_no; |------------>| |
+-----------+ | |
| |
+--------------------+ | |
| struct player *me; |------> struct player players[me->p_no]; |
+--------------------+ | |
| |
| struct player players[MAXPLAYER-2]; |
| struct player players[MAXPLAYER-1]; |
+----------------------------------------+
+--------------+
| memory->mctl |---------------+
+--------------+ v
+----------------------+
| struct mctl mctl[1]; |
| |
| mc_current |-------+
| mc_uplink[MAXPLAYER] | |
| mc_oob | |
+----------------------+ |
+------------------+ |
| memory->messages |-----------+ |
+------------------+ v |
+------------------------------|-------+
| struct message messages[MAXMESSAGE]; |
| | |
+--------------> | messages[0]; | |
| | messages[1]; <----+ |
| | messages[MAXMESSAGE-2]; |
| | messages[MAXMESSAGE-1]; |
| +--------------------------------------+
+------------+
| msgCurrent |
+------------+