152 lines
5.1 KiB
C++
152 lines
5.1 KiB
C++
/*
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* Copyright (c) 2006-2007 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Gabe Black
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*/
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#include "tracechild.hh"
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#include <sys/wait.h>
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#include <sys/ptrace.h>
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#include <iostream>
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#include <errno.h>
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using namespace std;
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bool TraceChild::startTracing(const char * pathToFile, char * const argv[])
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{
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instructions = 0;
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pid = fork();
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if(pid == -1)
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{
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cout << "fork failed" << endl;
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return false;
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}
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else if(pid == 0)
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{
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//We're the child. Get things ready and then exec the
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//program to trace.
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//Let our parent trace us
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ptrace(PTRACE_TRACEME, 0, 0, 0);
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//Start the program to trace
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execv(pathToFile, argv);
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//We should never get here, so this is an error!
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return false;
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}
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//From this point forward, we know we're in the parent process.
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if(!doWait())
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{
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cout << "Didn't wait successfully" << endl;
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return false;
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}
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tracing = true;
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if(!update(pid))
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{
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cout << "Didn't update successfully!" << endl;
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return false;
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}
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return true;
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}
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bool TraceChild::stopTracing()
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{
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if(ptrace(PTRACE_KILL, pid, 0, 0) != 0)
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return false;
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tracing = false;
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return true;
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}
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bool TraceChild::step()
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{
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ptraceSingleStep();
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}
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bool TraceChild::ptraceSingleStep()
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{
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if(!tracing)
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{
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cout << "Not tracing!" << endl;
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return false;
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}
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if(ptrace(PTRACE_SINGLESTEP, pid, 0, 0) != 0)
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{
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switch(errno)
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{
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case EBUSY: cout << "EBUSY" << endl; break;
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case EFAULT: cout << "EFAULT" << endl; break;
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case EIO: cout << "EIO" << endl; break;
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case EPERM: cout << "EPERM" << endl; break;
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case ESRCH: cout << "ESRCH" << endl; break;
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default: cout << "Unknown error" << endl; break;
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}
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cout << "Not able to single step!" << endl;
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tracing == false;
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return false;
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}
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doWait();
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update(pid);
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}
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bool TraceChild::doWait()
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{
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int wait_val;
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wait(&wait_val);
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if(WIFEXITED(wait_val))
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{
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cerr << "Program exited! Exit status is "
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<< WEXITSTATUS(wait_val) << endl;
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cerr << "Executed " << instructions
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<< " instructions." << endl;
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tracing = false;
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return false;
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}
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if(WIFSIGNALED(wait_val))
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{
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if(WTERMSIG(wait_val))
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cerr << "Program terminated by signal "
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<< WTERMSIG(wait_val) << endl;
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if(WCOREDUMP(wait_val))
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cerr << "Program core dumped!" << endl;
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tracing = false;
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cerr << "Executed " << instructions
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<< " instructions." << endl;
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return false;
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}
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if(WIFSTOPPED(wait_val) && WSTOPSIG(wait_val) != SIGTRAP)
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{
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cerr << "Program stopped by signal "
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<< WSTOPSIG(wait_val) << endl;
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tracing = false;
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cerr << "Executed " << instructions
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<< " instructions." << endl;
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return false;
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}
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return true;
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}
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