TRAXpackage it is possible to use external "plug-ins". These are user-supplied C-functions with a defined parameter list, compiled and linked in a special way (for specialists: the functions are prepared to be called as if they were part of a dynamic shared library). In order to facilitate the compile and link step a shell script is provided:
trxfct [-l<lib>] [-L<ldir>] [-I<idir>] [-D<define>] [-U<undef>] [-64] [-e<entrypoint>] <src>where
<src>is the C source file name (without extension),
<lib>is an optional user library name,
<ldir>is an optional user library directory,
<idir>is an optional user include directory.
<entrypoint>is the name of the entrypoint, it is this name with which the plug-in can be called at run time. If omitted, the name of the source file is assumed. The actual name must be chosen as required by the application (see functions)
trxfctto load properly, in most UNIX environments the current directory must be included in the shared library path before running
trax, if not provided by default in your account's profile:
export LD_LIBRARY_PATH=.:$LD_LIBRARY_PATH # Linux, Solaris, IRIX export SHLIB_PATH=.:$SHLIB_PATH # HP-UX export LIBPATH=.:$LIBPATH # AIX
trxfct -eTRXEvalUsr myfctcompiles the source file
myfct.c, creates the loadable executable
myfctand assigns it the entry point
Example for a source file.