| // 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"); |
| } |
| |