The Tor Browser: ipc/chromium/src/base/debug_util_posix.cc@6474c204b198 (annotated)

ipc/chromium/src/base/debug_util_posix.cc@6474c204b198 (annotated)

ipc/chromium/src/base/debug_util_posix.cc

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 // Copyright (c) 2006-2009 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 "build/build_config.h"
 #include "base/debug_util.h"
 #define MOZ_HAVE_EXECINFO_H (defined(OS_LINUX) && !defined(ANDROID))
 #include <errno.h>
 #include <fcntl.h>
 #include <stdio.h>
 #include <limits.h>
 #include <sys/stat.h>
 #include <sys/param.h>
 #include <sys/types.h>
 #include <unistd.h>
 #if MOZ_HAVE_EXECINFO_H
 #include <execinfo.h>
 #endif
 #if defined(OS_MACOSX) || defined(OS_BSD)
 #if defined(OS_OPENBSD)
 #include <sys/proc.h>
 #endif
 #include <sys/sysctl.h>
 #endif
 #if defined(OS_DRAGONFLY) || defined(OS_FREEBSD)
 #include <sys/user.h>
 #endif
 #include "base/basictypes.h"
 #include "base/eintr_wrapper.h"
 #include "base/logging.h"
 #include "base/scoped_ptr.h"
 #include "base/string_piece.h"
 #if defined(OS_NETBSD)
 #undef KERN_PROC
 #define KERN_PROC KERN_PROC2
 #define KINFO_PROC struct kinfo_proc2
 #else
 #define KINFO_PROC struct kinfo_proc
 #endif
 #if defined(OS_MACOSX)
 #define KP_FLAGS kp_proc.p_flag
 #elif defined(OS_DRAGONFLY)
 #define KP_FLAGS kp_flags
 #elif defined(OS_FREEBSD)
 #define KP_FLAGS ki_flag
 #elif defined(OS_OPENBSD) && !defined(_P_TRACED)
 #define KP_FLAGS p_psflags
 #define P_TRACED PS_TRACED
 #else
 #define KP_FLAGS p_flag
 #endif
 // static
 bool DebugUtil::SpawnDebuggerOnProcess(unsigned /* process_id */) {
   NOTIMPLEMENTED();
   return false;
 }
 #if defined(OS_MACOSX) || defined(OS_BSD)
 // Based on Apple's recommended method as described in
 // http://developer.apple.com/qa/qa2004/qa1361.html
 // static
 bool DebugUtil::BeingDebugged() {
   // If the process is sandboxed then we can't use the sysctl, so cache the
   // value.
   static bool is_set = false;
   static bool being_debugged = false;
   if (is_set) {
     return being_debugged;
   }
   // Initialize mib, which tells sysctl what info we want.  In this case,
   // we're looking for information about a specific process ID.
   int mib[] = {
     CTL_KERN,
     KERN_PROC,
     KERN_PROC_PID,
     getpid(),
 #if defined(OS_NETBSD) || defined(OS_OPENBSD)
     sizeof(KINFO_PROC),
 ,
 #endif
   };
   // Caution: struct kinfo_proc is marked __APPLE_API_UNSTABLE.  The source and
   // binary interfaces may change.
   KINFO_PROC info;
   size_t info_size = sizeof(info);
   int sysctl_result = sysctl(mib, arraysize(mib), &info, &info_size, NULL, 0);
   DCHECK(sysctl_result == 0);
   if (sysctl_result != 0) {
     is_set = true;
     being_debugged = false;
     return being_debugged;
   }
   // This process is being debugged if the P_TRACED flag is set.
   is_set = true;
   being_debugged = (info.KP_FLAGS & P_TRACED) != 0;
   return being_debugged;
 }
 #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.
 // static
 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 = HANDLE_EINTR(read(status_fd, buf, sizeof(buf)));
   HANDLE_EINTR(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  // OS_LINUX
 // static
 void DebugUtil::BreakDebugger() {
 #if defined(ARCH_CPU_X86_FAMILY)
   asm ("int3");
 #endif
 }
 StackTrace::StackTrace() {
   const int kMaxCallers = 256;
   void* callers[kMaxCallers];
 #if MOZ_HAVE_EXECINFO_H
   int count = backtrace(callers, kMaxCallers);
 #else
   int count = 0;
 #endif
   // Though the backtrace API man page does not list any possible negative
   // return values, we still still exclude them because they would break the
   // memcpy code below.
   if (count > 0) {
     trace_.resize(count);
     memcpy(&trace_[0], callers, sizeof(callers[0]) * count);
   } else {
     trace_.resize(0);
   }
 }
 void StackTrace::PrintBacktrace() {
   fflush(stderr);
 #if MOZ_HAVE_EXECINFO_H
   backtrace_symbols_fd(&trace_[0], trace_.size(), STDERR_FILENO);
 #endif
 }
 void StackTrace::OutputToStream(std::ostream* os) {
   return;
 }

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ipc/chromium/src/base/debug_util_posix.cc@6474c204b198 (annotated)

ipc/chromium/src/base/debug_util_posix.cc