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// debug_util.cpp
/* Copyright 2009 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
*/
#include "mongo/pch.h"
#include "mongo/db/server_options.h"
#ifndef _WIN32
#include <signal.h>
#endif
#if defined(USE_GDBSERVER)
#include "mongo/db/jsobj.h"
#endif // defined(USE_GDBSERVER)
namespace mongo {
void mongo_breakpoint() {
#ifdef _WIN32
DEV DebugBreak();
#endif
#ifndef _WIN32
// code to raise a breakpoint in GDB
ONCE {
//prevent SIGTRAP from crashing the program if default action is specified and we are not in gdb
struct sigaction current;
sigaction(SIGTRAP, NULL, ¤t);
if (current.sa_handler == SIG_DFL) {
signal(SIGTRAP, SIG_IGN);
}
}
raise(SIGTRAP);
#endif
}
#if defined(USE_GDBSERVER)
/* Magic gdb trampoline
* Do not call directly! call setupSIGTRAPforGDB()
* Assumptions:
* 1) gdbserver is on your path
* 2) You have run "handle SIGSTOP noprint" in gdb
* 3) serverGlobalParams.port + 2000 is free
*/
void launchGDB(int) {
// Don't come back here
signal(SIGTRAP, SIG_IGN);
int newPort = serverGlobalParams.port + 2000;
string newPortStr = "localhost:" + BSONObjBuilder::numStr(newPort);
string pidToDebug = BSONObjBuilder::numStr(getpid());
cout << "\n\n\t**** Launching gdbserver on " << newPortStr << " ****" << endl << endl;
if (fork() == 0) {
//child
execlp("gdbserver", "gdbserver", "--attach", newPortStr.c_str(), pidToDebug.c_str(), NULL);
perror(NULL);
}
else {
//parent
raise(SIGSTOP); // pause all threads until gdb connects and continues
raise(SIGTRAP); // break inside gdbserver
}
}
void setupSIGTRAPforGDB() {
verify( signal(SIGTRAP , launchGDB ) != SIG_ERR );
}
#else
void setupSIGTRAPforGDB() {
}
#endif
}
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