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/*$Id: c_attach.cc $ -*- C++ -*-
* Copyright (C) 2007 Albert Davis
* Author: Albert Davis <aldavis@gnu.org>
*
* This file is part of "Gnucap", the Gnu Circuit Analysis Package
*
* 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 3, 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.
*------------------------------------------------------------------
*/
//testing=script 2017.06.22
#include "e_cardlist.h"
#include "c_comand.h"
#include "globals.h"
/*--------------------------------------------------------------------------*/
namespace {
/*--------------------------------------------------------------------------*/
std::map<std::string, void*> attach_list;
/*--------------------------------------------------------------------------*/
std::string plug_path()
{
return OS::getenv("GNUCAP_PLUGPATH");
}
/*--------------------------------------------------------------------------*/
void list()
{
for (std::map<std::string, void*>::iterator
ii = attach_list.begin(); ii != attach_list.end(); ++ii) {
if (ii->second) {
IO::mstdout << ii->first << '\n';
}else{itested();
error(bTRACE, ii->first + " (unloaded)\n");
}
}
}
/*--------------------------------------------------------------------------*/
class CMD_ATTACH : public CMD {
public:
void do_it(CS& cmd, CARD_LIST* Scope)override {
assert(Scope);
if (Scope == &CARD_LIST::card_list) {
}else{untested();
}
size_t here = cmd.cursor();
int dl_scope = RTLD_LOCAL;
int check = RTLD_NOW;
// RTLD_NOW means to resolve symbols on loading
// RTLD_LOCAL means symbols defined in a plugin are local
do {
if (cmd.umatch("public ")) {itested();
dl_scope = RTLD_GLOBAL;
// RTLD_GLOBAL means symbols defined in a plugin are global
// Use this when a plugin depends on another.
}else if (cmd.umatch("lazy ")) {untested();
check = RTLD_LAZY;
// RTLD_LAZY means to defer resolving symbols until needed
// Use when a plugin will not load because of unresolved symbols,
// but it may work without it.
}else{
}
} while (cmd.more() && !cmd.stuck(&here));
std::string short_file_name;
cmd >> short_file_name;
if (short_file_name == "") {
// nothing, list what we have
list();
}else{
// a name to look for
// check if already loaded
if (void* handle = attach_list[short_file_name]) {itested();
if (Scope->is_empty()) {itested();
cmd.warn(bDANGER, here, "\"" + short_file_name + "\": already loaded, replacing");
dlclose(handle);
attach_list[short_file_name] = NULL;
}else{itested();
cmd.reset(here);
throw Exception_CS("already loaded, cannot replace when there is a circuit", cmd);
}
}else{
}
std::string full_file_name;
if (short_file_name[0]=='/' || short_file_name[0]=='.'){itested();
if (OS::access_ok(short_file_name, R_OK)) {itested();
// found it, local or root
full_file_name = short_file_name;
}else{untested();
cmd.reset(here);
throw Exception_CS(std::string("plugin not found in ") + short_file_name[0], cmd);
}
}else{
std::string path = plug_path();
full_file_name = findfile(short_file_name, path, R_OK);
if (full_file_name != "") {
// found it, with search
}else{itested();
cmd.reset(here);
throw Exception_CS("plugin not found in " + path, cmd);
}
}
assert(OS::access_ok(full_file_name, R_OK));
if (void* handle = dlopen(full_file_name.c_str(), check | dl_scope)) {
attach_list[short_file_name] = handle;
}else{untested();
cmd.reset(here);
throw Exception_CS(dlerror(), cmd);
}
}
}
std::string help_text()const override {
return
"load command\n"
"Loads plugins\n"
"Syntax: load plugin\n"
"Plugin search path is: " + plug_path() + " \n"
"Path is set by GNUCAP_PLUGPATH environment variable\n"
"With no arg, it lists plugins already loaded\n\n";
}
} p1;
DISPATCHER<CMD>::INSTALL d1(&command_dispatcher, "attach|load", &p1);
/*--------------------------------------------------------------------------*/
class CMD_DETACH : public CMD {
public:
void do_it(CS& cmd, CARD_LIST* Scope) override {
assert(Scope);
if (Scope == &CARD_LIST::card_list) {
}else{untested();
}
size_t here = cmd.cursor(); //BUG// due to the way dlopen and dlclose work
std::string file_name; // it doesn't really work.
cmd >> file_name; // the dispatcher's active instance blocks unload
if (file_name == "") {
// nothing, list what we have
list();
}else{itested();
if (Scope->is_empty()) {itested();
void* handle = attach_list[file_name];
if (handle) {itested();
dlclose(handle);
attach_list[file_name] = NULL;
}else{untested();
cmd.reset(here);
throw Exception_CS("plugin not attached", cmd);
}
}else{untested();
throw Exception_CS("detach prohibited when there is a circuit", cmd);
}
}
}
std::string help_text()const override {
return
"unload command\n"
"Unloads plugins\n"
"Syntax: unload plugin\n"
"The name must match the name you loaded it with.\n"
"Prohibited when there is a circuit\n"
"With no arg, it lists plugins already loaded\n\n";
}
} p2;
DISPATCHER<CMD>::INSTALL d2(&command_dispatcher, "detach|unload", &p2);
/*--------------------------------------------------------------------------*/
class CMD_DETACH_ALL : public CMD {
public:
void do_it(CS& cmd, CARD_LIST* Scope)override {
assert(Scope);
if (Scope == &CARD_LIST::card_list) {
}else{untested();
}
if (Scope->is_empty()) {
for (std::map<std::string, void*>::iterator
ii = attach_list.begin(); ii != attach_list.end(); ++ii) {
void* handle = ii->second;
if (handle) {
dlclose(handle);
ii->second = NULL;
}else{itested();
// name still in list, but has been detached already
}
}
}else{untested();
throw Exception_CS("detach prohibited when there is a circuit", cmd);
}
}
} p3;
DISPATCHER<CMD>::INSTALL d3(&command_dispatcher, "detach_all", &p3);
/*--------------------------------------------------------------------------*/
}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
// vim:ts=8:sw=2:noet:
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