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// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/debug_util.h"
#include <unistd.h>
#include <sys/sysctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "base/notimplemented.h"
#include "base/string_piece.h"
bool DebugUtil::SpawnDebuggerOnProcess(unsigned /* process_id */) {
NOTIMPLEMENTED();
return false;
}
#if defined(OS_MACOSX)
// http://developer.apple.com/qa/qa2004/qa1361.html
bool DebugUtil::BeingDebugged() {
NOTIMPLEMENTED();
return false;
}
#elif defined(OS_LINUX)
// We can look in /proc/self/status for TracerPid. We are likely used in crash
// handling, so we are careful not to use the heap or have side effects.
// Another option that is common is to try to ptrace yourself, but then we
// can't detach without forking(), and that's not so great.
bool DebugUtil::BeingDebugged() {
int status_fd = open("/proc/self/status", O_RDONLY);
if (status_fd == -1)
return false;
// We assume our line will be in the first 1024 characters and that we can
// read this much all at once. In practice this will generally be true.
// This simplifies and speeds up things considerably.
char buf[1024];
ssize_t num_read = read(status_fd, buf, sizeof(buf));
close(status_fd);
if (num_read <= 0)
return false;
StringPiece status(buf, num_read);
StringPiece tracer("TracerPid:\t");
StringPiece::size_type pid_index = status.find(tracer);
if (pid_index == StringPiece::npos)
return false;
// Our pid is 0 without a debugger, assume this for any pid starting with 0.
pid_index += tracer.size();
return pid_index < status.size() && status[pid_index] != '0';
}
#endif
// static
void DebugUtil::BreakDebugger() {
asm ("int3");
}
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