creation of voip-engine tree, with some docs

20060115170953-25e70-894c2cacfd64b2cef58e771ddfae0aa1c57d9fab.gz

15 files changed, 1491 insertions, 0 deletions

diff --git a/AUTHORS b/AUTHORS
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diff --git a/COPYING b/COPYING
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diff --git a/ChangeLog b/ChangeLog
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diff --git a/INSTALL b/INSTALL
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+Installation Instructions
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+
+   If the package supports it, you can cause programs to be installed
+with an extra prefix or suffix on their names by giving `configure' the
+option `--program-prefix=PREFIX' or `--program-suffix=SUFFIX'.
+
+Optional Features
+=================
+
+Some packages pay attention to `--enable-FEATURE' options to
+`configure', where FEATURE indicates an optional part of the package.
+They may also pay attention to `--with-PACKAGE' options, where PACKAGE
+is something like `gnu-as' or `x' (for the X Window System).  The
+`README' should mention any `--enable-' and `--with-' options that the
+package recognizes.
+
+   For packages that use the X Window System, `configure' can usually
+find the X include and library files automatically, but if it doesn't,
+you can use the `configure' options `--x-includes=DIR' and
+`--x-libraries=DIR' to specify their locations.
+
+Specifying the System Type
+==========================
+
+There may be some features `configure' cannot figure out automatically,
+but needs to determine by the type of machine the package will run on.
+Usually, assuming the package is built to be run on the _same_
+architectures, `configure' can figure that out, but if it prints a
+message saying it cannot guess the machine type, give it the
+`--build=TYPE' option.  TYPE can either be a short name for the system
+type, such as `sun4', or a canonical name which has the form:
+
+     CPU-COMPANY-SYSTEM
+
+where SYSTEM can have one of these forms:
+
+     OS KERNEL-OS
+
+   See the file `config.sub' for the possible values of each field.  If
+`config.sub' isn't included in this package, then this package doesn't
+need to know the machine type.
+
+   If you are _building_ compiler tools for cross-compiling, you should
+use the `--target=TYPE' option to select the type of system they will
+produce code for.
+
+   If you want to _use_ a cross compiler, that generates code for a
+platform different from the build platform, you should specify the
+"host" platform (i.e., that on which the generated programs will
+eventually be run) with `--host=TYPE'.
+
+Sharing Defaults
+================
+
+If you want to set default values for `configure' scripts to share, you
+can create a site shell script called `config.site' that gives default
+values for variables like `CC', `cache_file', and `prefix'.
+`configure' looks for `PREFIX/share/config.site' if it exists, then
+`PREFIX/etc/config.site' if it exists.  Or, you can set the
+`CONFIG_SITE' environment variable to the location of the site script.
+A warning: not all `configure' scripts look for a site script.
+
+Defining Variables
+==================
+
+Variables not defined in a site shell script can be set in the
+environment passed to `configure'.  However, some packages may run
+configure again during the build, and the customized values of these
+variables may be lost.  In order to avoid this problem, you should set
+them in the `configure' command line, using `VAR=value'.  For example:
+
+     ./configure CC=/usr/local2/bin/gcc
+
+causes the specified `gcc' to be used as the C compiler (unless it is
+overridden in the site shell script).  Here is a another example:
+
+     /bin/bash ./configure CONFIG_SHELL=/bin/bash
+
+Here the `CONFIG_SHELL=/bin/bash' operand causes subsequent
+configuration-related scripts to be executed by `/bin/bash'.
+
+`configure' Invocation
+======================
+
+`configure' recognizes the following options to control how it operates.
+
+`--help'
+`-h'
+     Print a summary of the options to `configure', and exit.
+
+`--version'
+`-V'
+     Print the version of Autoconf used to generate the `configure'
+     script, and exit.
+
+`--cache-file=FILE'
+     Enable the cache: use and save the results of the tests in FILE,
+     traditionally `config.cache'.  FILE defaults to `/dev/null' to
+     disable caching.
+
+`--config-cache'
+`-C'
+     Alias for `--cache-file=config.cache'.
+
+`--quiet'
+`--silent'
+`-q'
+     Do not print messages saying which checks are being made.  To
+     suppress all normal output, redirect it to `/dev/null' (any error
+     messages will still be shown).
+
+`--srcdir=DIR'
+     Look for the package's source code in directory DIR.  Usually
+     `configure' can determine that directory automatically.
+
+`configure' also accepts some other, not widely useful, options.  Run
+`configure --help' for more details.
+
diff --git a/Makefile.am b/Makefile.am
new file mode 100644
index 0000000..7da3179
--- /dev/null
+++ b/Makefile.am
@@ -0,0 +1,3 @@
+ACLOCAL_AMFLAGS = -I m4
+
+SUBDIRS = doc
diff --git a/NEWS b/NEWS
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/NEWS
diff --git a/README b/README
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/README
diff --git a/_boring b/_boring
new file mode 100644
index 0000000..51eadc0
--- /dev/null
+++ b/_boring
@@ -0,0 +1,70 @@
+# Boring file regexps:
+\.hi$
+\.o$
+\.o\.cmd$
+\.ko$
+\.ko\.cmd$
+\.mod\.c$
+(^|/)\.tmp_versions($|/)
+(^|/)CVS($|/)
+(^|/)RCS($|/)
+~$
+#(^|/)\.[^/]
+(^|/)_darcs($|/)
+\.bak$
+\.BAK$
+\.orig$
+(^|/)vssver\.scc$
+\.swp$
+\.swo$
+(^|/)MT($|/)
+(^|/)\{arch\}($|/)
+(^|/).arch-ids($|/)
+(^|/),
+\.class$
+\.prof$
+(^|/)\.DS_Store$
+(^|/)BitKeeper($|/)
+(^|/)ChangeSet($|/)
+(^|/)\.svn($|/)
+\.py[co]$
+\#
+\.cvsignore$
+(^|/)Thumbs\.db$
+(^|/)Makefile$
+(^|/)Makefile.in$
+^aclocal.m4$
+^autom4te.cache($|/)
+^config.guess$
+^config.h$
+^config.h.in$
+^config.log$
+^config.status$
+^config.sub$
+^configure$
+^install-sh$
+^libtool$
+^ltmain.sh$
+^missing$
+^stamp-h1$
+^depcomp$
+^compile$
+(^|/).deps($|/)
+(^|/).libs($|/)
+\.lo$
+\.la$
+\-glue.(c|h)$
+\-marshal.(c|h)$
+\-enumtypes.(c|h)$
+\-bindings.(c|h)$
+\.pc$
+^tests/farsight_test$
+^tests/sip_test$
+^po/POTFILES$
+^docs/core/farsight-decl-list.txt$
+^docs/core/farsight-decl.txt$
+^docs/core/farsight-overrides.txt$
+^docs/core/farsight-undocumented.txt$
+^docs/core/html($|/)
+^docs/core/tmpl($|/)
+^docs/core/xml($|/)
diff --git a/configure.ac b/configure.ac
new file mode 100644
index 0000000..cc5379a
--- /dev/null
+++ b/configure.ac
@@ -0,0 +1,49 @@
+AC_INIT(Makefile.am)
+
+AM_INIT_AUTOMAKE(libtelepathy, 0.1.`date +%Y%m%d`)
+AM_CONFIG_HEADER(config.h)
+AC_CANONICAL_HOST
+
+AC_CONFIG_MACRO_DIR([m4])
+
+AC_PROG_LIBTOOL
+AC_PROG_CC
+AC_PROG_CC_STDC
+AC_PROG_INSTALL
+AC_PROG_LIBTOOL
+
+CFLAGS="$CFLAGS -Wall -ansi"
+
+AC_SUBST(ERROR_CFLAGS)
+
+AC_HEADER_STDC([])
+AC_C_INLINE
+
+dnl options for building sequence diagrams
+SEQ_DIAS
+
+dnl Check for Glib 
+PKG_CHECK_MODULES(GLIB, gobject-2.0 >= 2.4, have_glib=yes, have_glib=no)
+
+if test x$have_glib = xno ; then
+    AC_MSG_ERROR([GLib development libraries not found])
+fi
+GLIB_GENMARSHAL=`$PKG_CONFIG --variable=glib_genmarshal glib-2.0`
+AC_SUBST(GLIB_CFLAGS)
+AC_SUBST(GLIB_LIBS)
+AC_SUBST(GLIB_GENMARSHAL)
+
+dnl Check for DBus
+PKG_CHECK_MODULES(DBUS, [dbus-1 >= 0.51, dbus-glib-1 >= 0.51], have_dbus=yes, have_dbus=no)
+
+AC_SUBST(DBUS_CFLAGS)
+AC_SUBST(DBUS_LIBS)
+
+dnl TODO Error if dbus isn't found
+
+AC_OUTPUT( Makefile \
+          doc/Makefile
+)
+
+
+
diff --git a/doc/.git-darcs-dir b/doc/.git-darcs-dir
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/doc/.git-darcs-dir
diff --git a/doc/Makefile.am b/doc/Makefile.am
new file mode 100644
index 0000000..ee319fe
--- /dev/null
+++ b/doc/Makefile.am
@@ -0,0 +1,15 @@
+CLEANFILES =
+
+if MAKE_SEQ_DIAS
+
+SEQ_DIA_PICS = make-call.pic recieve-call.pic
+SEQ_DIA_PNGS = $(patsubst %.pic,%.png,$(SEQ_DIA_PICS))
+CLEANFILES += $(SEQ_DIA_FILES)
+
+all-local: $(SEQ_DIA_PNGS)
+dist-hook-local:
+	-cp $(srcdir)/$(SEQ_DIA_PICS) $(distdir)/
+
+%.png: %.pic sequence.pic
+	set -o pipefail; $(PIC2PLOT) -Tps --font-name AvantGarde-Book $< | $(CONVERT) -density 112 - $@ ; rm .sequence.temp
+endif
diff --git a/doc/make-call.pic b/doc/make-call.pic
new file mode 100644
index 0000000..6c94de9
--- /dev/null
+++ b/doc/make-call.pic
@@ -0,0 +1,136 @@
+.PS
+copy "sequence.pic";
+
+# Define the objects
+object(Remote,"Remote GTalk"); move;
+object(Connmgr,"Gabble");move;
+placeholder_object(Channel,"StreamedMediaChannel");move;
+placeholder_object(SessionHandler,"SessionHandler");move;
+placeholder_object(StreamHandler,"StreamHandler");
+move;move;
+placeholder_object(Client,"VoIP engine");
+move;
+placeholder_object(Session);
+move;
+placeholder_object(Stream);
+step();
+
+# Message sequences
+active(Remote);
+step();
+active(Connmgr);
+message(Remote,Connmgr,"jingle initiate")
+message(Connmgr,Remote,"prelim accept")
+create_message(Connmgr,Channel,"StreamedMediaChannel");
+active(Channel)
+create_message(Channel,Client, "VoIPEngine");
+create_message(Channel,SessionHandler, "SessionHandler");
+active(Client);
+message(Channel,Client,"NewMediaSessionHandler(member,StreamHandler)");
+create_message(Client,Session, "FarsightSession");
+inactive(Client);
+step;
+
+active(SessionHandler)
+create_message(SessionHandler,StreamHandler, "StreamHandler");
+active(Client);
+message(SessionHandler,Client,"NewMediaStreamHandler(member,StreamHandler)");
+message(Client,Session,"create_stream()");
+create_message(Session,Stream,"FarsightStream");
+return_message(Session,Client);
+inactive(SessionHandler);
+inactive(Session);
+
+active(StreamHandler);
+message(StreamHandler,Client,"set-remote-codecs(...)");
+active(Stream);
+message(Client,Stream,"set_remote_codecs(...)");
+return_message(Stream,Client)
+message(Client,Stream,"list_codecs()");
+return_message(Stream,Client);
+message(Client,StreamHandler,"codecs(...)");
+return_message(StreamHandler,Client);
+
+message(Client,Stream,"prepare_transports()");
+return_message(Stream,Client);
+
+message(Remote,StreamHandler,"jingle candidate");
+message(StreamHandler,Client,"new-candidate(...)");
+message(Client,Stream,"new_remote_candidiate(...)");
+return_message(Stream,Client);
+
+message(Stream,Client,"new-native-candidate(id)");
+message(Client,Stream,"get_native_candidate(id)");
+return_message(Stream,Client);
+message(Client,StreamHandler,"new_native_candidate(...)");
+return_message(StreamHandler,Client);
+message(StreamHandler,Remote,"jingle candidiate");
+step;
+message(Remote,StreamHandler,"jingle candidate");
+message(StreamHandler,Client,"new-candidate(...)");
+message(Client,Stream,"new_remote_candidiate(...)");
+return_message(Stream,Client);
+
+message(Stream,Client,"new-native-candidate(id)");
+message(Client,Stream,"get_native_candidate(id)");
+return_message(Stream,Client);
+message(Client,StreamHandler,"new_native_candidate(...)");
+return_message(StreamHandler,Client);
+message(StreamHandler,Remote,"jingle candidiate");
+
+step;
+
+message(Stream,Client,"native-candidates-prepared");
+message(Client,StreamHandler,"native_candidates_prepared");
+return_message(StreamHandler,Client);
+
+message(Remote,StreamHandler,"ack candidates");
+
+step;
+message(Remote,Stream,"STUN")
+message(Stream,Remote,"STUN")
+step;
+
+message(Stream,Client,"new-active-candidate-pair");
+message(Client,Stream,"get_native_candidate");
+return_message(Stream,Client);
+message(Client,StreamHandler,"new_active_candidate_pair(...)")
+message(StreamHandler,Remote,"jingle accept");
+return_message(StreamHandler,Client);
+step();
+message(Remote,StreamHandler,"ack accept");
+
+
+step;
+message(Remote,Stream,"RTP+STUN")
+message(Stream,Remote,"RTP+STUN")
+step;
+
+message(Remote,StreamHandler,"terminate");
+message(StreamHandler,Client,"stop");
+message(Client,Stream,"state_playing(stopped)");
+return_message(Stream,Client);
+
+message(StreamHandler,Remote,"ack termianate");
+
+inactive(Stream);
+inactive(Session);
+inactive(StreamHandler);
+inactive(SessionHandler);
+destroy_message(Client,Stream);
+destroy_message(Client,Session);
+destroy_message(StreamHandler,SessionHandler);
+destroy_message(SessionHandler,Channel);
+inactive(Client);
+
+# Complete the lifelines
+step();
+complete(Remote);
+complete(Connmgr);
+complete(Channel);
+complete(SessionHandler);
+complete(StreamHandler);
+
+complete(Client);
+complete(Session);
+.PE
diff --git a/doc/sequence.pic b/doc/sequence.pic
new file mode 100644
index 0000000..bd8764b
--- /dev/null
+++ b/doc/sequence.pic
@@ -0,0 +1,486 @@
+#/usr/bin/pic2plot -Tps
+#
+# Pic macros for drawing UML sequence diagrams
+#
+# (C) Copyright 2004-2005 Diomidis Spinellis.
+#
+# Permission to use, copy, and distribute this software and its
+# documentation for any purpose and without fee is hereby granted,
+# provided that the above copyright notice appear in all copies and that
+# both that copyright notice and this permission notice appear in
+# supporting documentation.
+#
+# THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+# WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+# MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+#
+# $Id: sequence.pic 1.10 2005/10/19 18:36:08 dds Exp $
+#
+
+
+# Default parameters (can be redefined)
+
+# Spacing between messages
+spacing = 0.25;
+# Active box width
+awid = .1;
+# Box height
+boxht = 0.3;
+# Commend folding
+corner_fold=awid
+# Comment distance
+define comment_default_move {up 0.25 right 0.25};
+# Comment height
+comment_default_ht=0.5;
+# Comment width
+comment_default_wid=1;
+#Default Object width
+object_default_width = 0.75
+
+# set 2 to the width of a string(text)
+define getwidth {
+  print "getwidth(" $1
+  sh X 
+    for i in $1; do 
+      foo=$i; bar=0; 
+      if (( ${#i} > $bar)); then 
+        bar=${#i};
+      fi; 
+      echo "$i $bar" >> test; 
+    done; 
+    echo  " w= ($bar * 0.75) / 6;" > .sequence.temp 
+    cat .sequence.temp >> log.sh
+  X
+  copy ".sequence.temp";
+  if (w < object_default_width) then {
+    w = object_default_width;
+  }
+  print "width of " $1"  is " w
+}
+
+# Create a new object with custom width (name, text)
+define object {
+  getwidth($2);
+  $1: box $2 wid w; move;
+
+  # Could also underline text with \mk\ul\ul\ul...\rt
+  {
+    line from $1.w + (.1, -.07) to $1.e + (-.1, -.07);
+  }
+  move to $1.e;
+  move right;
+  # Active is the level of activations of the object
+  # 0 : inactive : draw thin line swimlane
+  # 1 : active : draw thick swimlane
+  # > 1: nested : draw nested swimlane
+  active_$1 = 0;
+  lifestart_$1 = $1.s.y;
+}
+
+# Create a new external actor(name,text)
+define actor {
+  getwidth($2)
+  $1: [
+    XSEQC: circle rad w;
+    XSEQL: line from XSEQC.s down 2*w;
+    line from XSEQL.start - (.15,.02) to XSEQL.start + (.15,-.02);
+    XSEQL1: line from XSEQL.end left .02+w down .15;
+    XSEQL2: line from XSEQL.end right .0+w down .15;
+    line at XSEQC.n invis "" "" "" $2;
+  ]
+  move to $1.e;
+  move right;
+  active_$1 = 0;
+  lifestart_$1 = $1.s.y - .05;
+}
+
+# Create a new placeholder object(name)
+define placeholder_object {
+  $1: box invisible;
+  move;
+  move to $1.e;
+  move right;
+  active_$1 = 0;
+  lifestart_$1 = $1.s.y;
+}
+
+define pobject {
+  placeholder_object($1);
+}
+
+define extend_lifeline {
+  if (active_$1 > 0) then {
+    # draw the left edges of the boxes
+    move to ($1.x - awid/2, Here.y);
+    for level = 1 to active_$1 do {
+      line from (Here.x, lifestart_$1) to Here;
+      move right awid/2
+    }
+
+    # draw the right edge of the innermost box
+    move right awid/2;
+    line from (Here.x, lifestart_$1) to Here;
+  } else {
+    line from ($1.x, lifestart_$1) to ($1.x, Here.y) dashed;
+  }
+  lifestart_$1 = Here.y;
+}
+
+# complete(name)
+# Complete the lifeline of the object with the given name
+define complete {
+  extend_lifeline($1)
+  if (active_$1) then {
+    # draw bottom of all active boxes
+    line right ((active_$1 + 1) * awid/2) from ($1.x - awid/2, Here.y);
+  }
+}
+
+# Draw a message (from_object,to_object,label)
+define message {
+  down;
+  move spacing;
+  getwidth($3);
+  # adjust object position so text fits
+  # add buffer of awid on either side for clarity
+
+  # Adjust so that lines and arrows do not fall into the
+  # active box.  Should be .5, but the arrow heads tend to
+  # overshoot.
+  if ($1.x <= $2.x) then {
+    off_from = awid * .6;
+    off_to = -awid * .6;
+  } else {
+    off_from = -awid * .6;
+    off_to = awid * .6;
+  }
+  # add half a box width for each level of nesting
+  if (active_$1 > 1) then {
+    off_from = off_from + (active_$1 - 1) * awid/2;
+  }
+
+  # add half a box width for each level of nesting
+  if (active_$2 > 1) then {
+    off_to = off_to + (active_$2 - 1) * awid/2;
+  }
+
+  if ($1.x == $2.x) then {
+    arrow from ($1.x + off_from, Here.y) right then down .25 then left $3 ljust " " " " " " ;
+  } else {
+    arrow from ($1.x + off_from, Here.y) to ($2.x + off_to, Here.y);
+    #draw the text seperatly to work around arrow bug
+    #add a small offset of awid for clarity
+    if ($1.x < $2.x) then {
+      sh X 
+        rm .sequence.temp; 
+        c=0
+        for i in $3; do
+          ((c++));
+          if ((c>1)); then
+            echo -n " \"$i\" below ljust " >> .sequence.temp;
+          else
+            echo -n " \"$i\" above ljust " >> .sequence.temp;
+            echo " at ($1.x + off_from + awid, Here.y)" >> .sequence.temp;
+          fi
+        done; 
+        if ((c>1)); then
+          echo " at ($1.x + off_from + awid, Here.y - $((c>1?c-2:1))*8/72)" >> .sequence.temp;
+        fi
+        cat .sequence.temp >> log.sh
+      X
+      copy ".sequence.temp"
+    } else {
+      sh X 
+        rm .sequence.temp; 
+        c=0
+        for i in $3; do
+          ((c++));
+          if ((c>1)); then
+            echo -n " \"$i\" below rjust " >> .sequence.temp;
+          else
+            echo -n " \"$i\" above rjust " >> .sequence.temp;
+            echo " at ($1.x + off_from - awid, Here.y)" >> .sequence.temp;
+          fi
+        done; 
+        if ((c>1)); then
+          echo " at ($1.x + off_from - awid, Here.y - $((c>1?c-2:1))*8/72)" >> .sequence.temp;
+        fi
+        cat .sequence.temp >> log.sh
+      X
+      copy ".sequence.temp"
+    }
+  }
+}
+
+# Display a lifeline constraint(object,label)
+define lifeline_constraint {
+  off_from = awid;
+  # add half a box width for each level of nesting
+  if (active_$1 > 1) then {
+    off_from = off_from + (active_$1 - 1) * awid/2;
+  }
+
+  box at ($1.x + off_from, Here.y) invis $2 ljust " " ;
+}
+
+define lconstraint {
+  lifeline_constraint($1,$2);
+}
+
+# Display an object constraint(label)
+# for the last object drawn
+define object_constraint {
+  { box invis with .s at last box .nw $1 ljust; }
+}
+
+define oconstraint {
+  object_constraint($1);
+}
+
+# Draw a creation message(from_object,to_object,object_label)
+define create_message {
+  down;
+  move spacing;
+  if ($1.x <= $2.x) then {
+    off_from = awid * .6;
+    off_to = -boxwid * .51;
+  } else {
+    off_from = -awid * .6;
+    off_to = boxwid * .51;
+  }
+
+  # add half a box width for each level of nesting
+  if (active_$1 > 1) then {
+    off_from = off_from + (active_$1 - 1) * awid/2;
+  }
+  
+  #we shouldnt need to adjust object positioning for this message
+  #as it fits within the minimal defaults  
+  # See comment in destroy_message
+  XSEQA: arrow from ($1.x + off_from, Here.y) to ($2.x + off_to, Here.y)  " ";
+  #draw the text seperatly to work around arrow bug
+  #add a small offset of awid for clarity
+  if ($1.x < $2.x) then {
+    "«create»" above ljust at ($1.x + off_from + awid, Here.y) ;
+  } else {
+    "«create»" above rjust at ($1.x + off_from - awid, Here.y) ;
+  }
+
+  getwidth($3);
+  if ($1.x <= $2.x) then {
+    { XSEQB: box $3 wid w with .w at XSEQA.end; }
+  } else {
+    { XSEQB: box $3 wid w with .e at XSEQA.end; }
+  }
+  {
+    line from XSEQB.w + (.1, -.07) to XSEQB.e + (-.1, -.07);
+  }
+  lifestart_$2 = XSEQB.s.y;
+  move (spacing + boxht) / 2;
+}
+
+define cmessage {
+  create_message($1,$2,$3);
+}
+
+# Draw an X for a given object
+define drawx {
+  {
+  line from($1.x - awid, lifestart_$1 - awid) to ($1.x + awid, lifestart_$1 + awid);
+  line from($1.x - awid, lifestart_$1 + awid) to ($1.x + awid, lifestart_$1 - awid);
+  }
+}
+
+# Draw a destroy message(from_object,to_object)
+define destroy_message {
+  down;
+  move spacing;
+  # The troff code is \(Fo \(Fc
+  # The groff code is also \[Fo] \[Fc]
+  # The pic2plot code is \Fo \Fc
+  # See http://www.delorie.com/gnu/docs/plotutils/plotutils_71.html
+  # To stay compatible with all we have to hardcode the characters
+  message($1,$2,"«destroy»");
+  complete($2);
+  drawx($2);
+}
+
+define dmessage {
+  destroy_message($1,$2);
+}
+
+# An object deletes itself: delete(object)
+define delete {
+  complete($1);
+  lifestart_$1 = lifestart_$1 - awid;
+  drawx($1);
+}
+
+# Draw a message return(from_object,to_object,label)
+define return_message {
+  down;
+  move spacing;
+  # See comment in message
+  if ($1.x <= $2.x) then {
+    off_from = awid * .6;
+    off_to = -awid * .6;
+  } else {
+    off_from = -awid * .6;
+    off_to = awid * .6;
+  }
+
+  # add half a box width for each level of nesting
+  if (active_$1 > 1) then {
+    off_from = off_from + (active_$1 - 1) * awid/2;
+  }
+
+  # add half a box width for each level of nesting
+  if (active_$2 > 1) then {
+    off_to = off_to + (active_$2 - 1) * awid/2;
+  }
+
+  arrow from  ($1.x + off_from, Here.y) to ($2.x + off_to, Here.y) dashed $3 " ";
+}
+
+define rmessage {
+  return_message($1,$2,$3);
+}
+
+# Object becomes active
+# Can be nested to show recursion
+define active {
+  extend_lifeline($1);
+  # draw top of new active box
+  line right awid from ($1.x + (active_$1 - 1) * awid/2, Here.y);
+  active_$1 = active_$1 + 1;
+}
+
+# Object becomes inactive
+# Can be nested to show recursion
+define inactive {
+  extend_lifeline($1);
+  active_$1 = active_$1 - 1;
+  # draw bottom of innermost active box
+  line right awid from ($1.x + (active_$1 - 1) * awid/2, Here.y);
+}
+
+# Time step
+# Useful at the beginning and the end
+# to show object states
+define step {
+  down;
+  move spacing;
+}
+
+# Switch to asynchronous messages
+define async {
+  arrowhead = 0;
+  arrowwid = arrowwid * 2;
+}
+
+# Switch to synchronous messages
+define sync {
+  arrowhead = 1;
+  arrowwid = arrowwid / 2;
+}
+
+# same as lifeline_constraint, but Text and empty string are exchanged.
+define lconstraint_below{
+  off_from = awid;
+  # add half a box width for each level of nesting
+  if (active_$1 > 1) then {
+    off_from = off_from + (active_$1 - 1) * awid/2;
+  }
+
+  box at ($1.x + off_from, Here.y) invis "" $2 ljust;
+}
+
+# begin_frame(left_object,name,label_text);
+define begin_frame {
+  # The lifeline will be cut here
+  extend_lifeline($1);
+  # draw the frame-label
+  $2: box $3 invis with .n at ($1.x, Here.y);
+  d = $2.e.y - $2.se.y;
+  line from $2.ne to $2.e then down d left d then to $2.sw;
+  # continue the lifeline below the frame-label
+  move to $2.s;
+  lifestart_$1 = Here.y;
+}
+
+# end_frame(right_object,name);
+define end_frame {
+  # dummy-box for the lower right corner:
+  box invis "" with .s at ($1.x, Here.y);
+  # draw the frame
+  frame_wid = last box.se.x - $2.nw.x
+  frame_ht = - last box.se.y + $2.nw.y
+  box with .nw at $2.nw wid frame_wid ht frame_ht;
+  # restore Here.y
+  move to last box.s;
+}
+
+# comment(object,[name],[line_movement], [box_size] text);
+define comment {
+  old_y = Here.y
+  # draw the first connecting line, at which's end the box wil be positioned
+  move to ($1.x, Here.y)
+  if "$3" == "" then {
+    line comment_default_move() dashed;
+  } else {
+    line $3 dashed;
+  }
+
+  # draw the box, use comment_default_xx if no explicit
+  # size is given together with the text in parameter 4
+  old_boxht=boxht;
+  old_boxwid=boxwid;
+  boxht=comment_default_ht;
+  boxwid=comment_default_wid;
+  if "$2" == "" then {
+    box invis $4;
+  } else {
+    $2: box invis $4;
+  }
+  boxht=old_boxht;
+  boxwid=old_boxwid;
+
+  # draw the frame of the comment
+  line from last box.nw \
+    to      last box.ne - (corner_fold, 0) \
+    then to last box.ne - (0, corner_fold) \
+    then to last box.se \
+    then to last box.sw \
+    then to last box.nw ;
+  line from last box.ne - (corner_fold, 0) \
+    to      last box.ne - (corner_fold, corner_fold) \
+    then to last box.ne - (0, corner_fold) ;
+
+  # restore Here.y
+  move to ($1.x, old_y)
+}
+
+# connect_to_comment(object,name);
+define connect_to_comment {
+  old_y = Here.y
+  # start at the object
+  move to ($1.x, Here.y)
+  # find the best connection-point of the comment to use as line-end
+  if $1.x < $2.w.x then {
+    line to $2.w dashed;
+  } else {
+    if $1.x > $2.e.x then {
+      line to $2.e dashed;
+    } else {
+      if Here.y < $2.s.y then {
+        line to $2.s dashed;
+      } else {
+        if Here.y > $2.n.y then {
+          line to $2.n dashed;
+        }
+      }
+    }
+  }
+  # restore Here.y
+  move to ($1.x, old_y)
+}
diff --git a/m4/.git-darcs-dir b/m4/.git-darcs-dir
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/m4/.git-darcs-dir
diff --git a/m4/seq-dias.m4 b/m4/seq-dias.m4
new file mode 100644
index 0000000..faf0f40
--- /dev/null
+++ b/m4/seq-dias.m4
@@ -0,0 +1,33 @@
+AC_DEFUN([SEQ_DIAS],
+[
+dnl check for tools for drawing sequence diagrams
+AC_ARG_ENABLE(seq-dias,
+      AC_HELP_STRING([--enable-sequence-diagrams],
+                         [use plotutils to draw sequence diagrams [default=yes]]),,
+          enable_seq_dias=yes)
+
+MAKE_SEQ_DIAS=no
+if test x$enable_seq_dias = xyes; then
+  MAKE_SEQ_DIAS=yes
+  AC_PATH_PROG(PIC2PLOT, pic2plot, no)
+  AC_PATH_PROG(GS, gs, no)
+  AC_PATH_PROG(CONVERT, convert, no)
+  if test "$CONVERT" == "no"; then
+      AC_MSG_WARN([Imagemagick not found, drawing sequence diagrams will be disabled.])
+    MAKE_SEQ_DIAS=no
+      fi
+        if test "$GS" == "no"; then
+            AC_MSG_WARN([Ghostscript not found, drawing sequence diagrams will be disabled.])
+    MAKE_SEQ_DIAS=no
+      fi
+        if test "$PIC2PLOT" == "no"; then
+            AC_MSG_WARN([GNU plotutils not found, drawing sequence diagrams will be disabled.])
+    MAKE_SEQ_DIAS=no
+      fi
+        AC_SUBST(PIC2PLOT)
+  AC_SUBST(CONVERT)
+
+fi
+AC_SUBST(MAKE_SEQ_DIAS)
+AM_CONDITIONAL(MAKE_SEQ_DIAS, test x$MAKE_SEQ_DIAS == xyes)
+])