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/*
* Copyright (C) 2013 Jeff Epler <jepler@unpythonic.net>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "interp_base.hh"
#include <dlfcn.h>
#include <limits.h>
#include <config.h>
#include <stdio.h>
InterpBase::~InterpBase() {}
InterpBase *interp_from_shlib(const char *shlib) {
void * interp_lib;
char relative_interp[PATH_MAX];
char const * interp_path;
dlopen(NULL, RTLD_GLOBAL);
if (shlib[0] == '/') {
// The passed-in .so name is an absolute path, use it directly.
interp_path = shlib;
} else {
// The passed-in .so name is a relative path or just a bare
// filename, look for it in `${EMC2_HOME}/lib/linuxcnc`.
snprintf(relative_interp, sizeof(relative_interp), "%s/%s", EMC2_HOME "/lib/linuxcnc", shlib);
interp_path = relative_interp;
}
interp_lib = dlopen(interp_path, RTLD_NOW);
if(!interp_lib) {
fprintf(stderr, "emcTaskInit: could not open interpreter '%s': %s\n", interp_path, dlerror());
return 0;
}
fprintf(stderr, "emcTaskInit: using custom interpreter '%s'\n", interp_path);
typedef InterpBase* (*Constructor)();
Constructor constructor = (Constructor)dlsym(interp_lib, "makeInterp");
if(!constructor) {
fprintf(stderr, "emcTaskInit: could not get symbol makeInterp from interpreter '%s': %s\n", shlib, dlerror());
return 0;
}
InterpBase *pinterp = constructor();
if(!pinterp) {
fprintf(stderr, "emcTaskInit: makeInterp() returned NULL from interpreter '%s'\n", shlib);
return 0;
}
return pinterp;
}
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