Move base to DEPS

base/debug/debugger_posix.cc

-// Copyright (c) 2012 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/debugger.h"
-#include "build/build_config.h"
-
-#include <errno.h>
-#include <fcntl.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <sys/param.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <unistd.h>
-
-#include <vector>
-
-#if defined(__GLIBCXX__)
-#include <cxxabi.h>
-#endif
-
-#if defined(OS_MACOSX)
-#include <AvailabilityMacros.h>
-#endif
-
-#if defined(OS_MACOSX) || defined(OS_BSD)
-#include <sys/sysctl.h>
-#endif
-
-#if defined(OS_FREEBSD)
-#include <sys/user.h>
-#endif
-
-#include <ostream>
-
-#include "base/basictypes.h"
-#include "base/logging.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/posix/eintr_wrapper.h"
-#include "base/strings/string_piece.h"
-
-#if defined(USE_SYMBOLIZE)
-#include "base/third_party/symbolize/symbolize.h"
-#endif
-
-#if defined(OS_ANDROID)
-#include "base/threading/platform_thread.h"
-#endif
-
-namespace base {
-namespace debug {
-
-#if defined(OS_MACOSX) || defined(OS_BSD)
-
-// Based on Apple's recommended method as described in
-// http://developer.apple.com/qa/qa2004/qa1361.html
-bool BeingDebugged() {
-  // NOTE: This code MUST be async-signal safe (it's used by in-process
-  // stack dumping signal handler). NO malloc or stdio is allowed here.
-  //
-  // While some code used below may be async-signal unsafe, note how
-  // the result is cached (see |is_set| and |being_debugged| static variables
-  // right below). If this code is properly warmed-up early
-  // in the start-up process, it should be safe to use later.
-
-  // 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_OPENBSD)
-    , sizeof(struct kinfo_proc),
-    0
-#endif
-  };
-
-  // Caution: struct kinfo_proc is marked __APPLE_API_UNSTABLE.  The source and
-  // binary interfaces may change.
-  struct kinfo_proc info;
-  size_t info_size = sizeof(info);
-
-#if defined(OS_OPENBSD)
-  if (sysctl(mib, arraysize(mib), NULL, &info_size, NULL, 0) < 0)
-    return -1;
-
-  mib[5] = (info_size / sizeof(struct kinfo_proc));
-#endif
-
-  int sysctl_result = sysctl(mib, arraysize(mib), &info, &info_size, NULL, 0);
-  DCHECK_EQ(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;
-#if defined(OS_FREEBSD)
-  being_debugged = (info.ki_flag & P_TRACED) != 0;
-#elif defined(OS_BSD)
-  being_debugged = (info.p_flag & P_TRACED) != 0;
-#else
-  being_debugged = (info.kp_proc.p_flag & P_TRACED) != 0;
-#endif
-  return being_debugged;
-}
-
-#elif defined(OS_LINUX) || defined(OS_ANDROID)
-
-// 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 BeingDebugged() {
-  // NOTE: This code MUST be async-signal safe (it's used by in-process
-  // stack dumping signal handler). NO malloc or stdio is allowed here.
-
-  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)));
-  if (IGNORE_EINTR(close(status_fd)) < 0)
-    return false;
-
-  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';
-}
-
-#else
-
-bool BeingDebugged() {
-  NOTIMPLEMENTED();
-  return false;
-}
-
-#endif
-
-// We want to break into the debugger in Debug mode, and cause a crash dump in
-// Release mode. Breakpad behaves as follows:
-//
-// +-------+-----------------+-----------------+
-// | OS    | Dump on SIGTRAP | Dump on SIGABRT |
-// +-------+-----------------+-----------------+
-// | Linux |       N         |        Y        |
-// | Mac   |       Y         |        N        |
-// +-------+-----------------+-----------------+
-//
-// Thus we do the following:
-// Linux: Debug mode if a debugger is attached, send SIGTRAP; otherwise send
-//        SIGABRT
-// Mac: Always send SIGTRAP.
-
-#if defined(ARCH_CPU_ARMEL)
-#define DEBUG_BREAK_ASM() asm("bkpt 0")
-#elif defined(ARCH_CPU_ARM64)
-#define DEBUG_BREAK_ASM() asm("brk 0")
-#elif defined(ARCH_CPU_MIPS_FAMILY)
-#define DEBUG_BREAK_ASM() asm("break 2")
-#elif defined(ARCH_CPU_X86_FAMILY)
-#define DEBUG_BREAK_ASM() asm("int3")
-#endif
-
-#if defined(NDEBUG) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
-#define DEBUG_BREAK() abort()
-#elif defined(OS_NACL)
-// The NaCl verifier doesn't let use use int3.  For now, we call abort().  We
-// should ask for advice from some NaCl experts about the optimum thing here.
-// http://code.google.com/p/nativeclient/issues/detail?id=645
-#define DEBUG_BREAK() abort()
-#elif !defined(OS_MACOSX)
-// Though Android has a "helpful" process called debuggerd to catch native
-// signals on the general assumption that they are fatal errors. If no debugger
-// is attached, we call abort since Breakpad needs SIGABRT to create a dump.
-// When debugger is attached, for ARM platform the bkpt instruction appears
-// to cause SIGBUS which is trapped by debuggerd, and we've had great
-// difficulty continuing in a debugger once we stop from SIG triggered by native
-// code, use GDB to set |go| to 1 to resume execution; for X86 platform, use
-// "int3" to setup breakpiont and raise SIGTRAP.
-//
-// On other POSIX architectures, except Mac OS X, we use the same logic to
-// ensure that breakpad creates a dump on crashes while it is still possible to
-// use a debugger.
-namespace {
-void DebugBreak() {
-  if (!BeingDebugged()) {
-    abort();
-  } else {
-#if defined(DEBUG_BREAK_ASM)
-    DEBUG_BREAK_ASM();
-#else
-    volatile int go = 0;
-    while (!go) {
-      base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(100));
-    }
-#endif
-  }
-}
-}  // namespace
-#define DEBUG_BREAK() DebugBreak()
-#elif defined(DEBUG_BREAK_ASM)
-#define DEBUG_BREAK() DEBUG_BREAK_ASM()
-#else
-#error "Don't know how to debug break on this architecture/OS"
-#endif
-
-void BreakDebugger() {
-  // NOTE: This code MUST be async-signal safe (it's used by in-process
-  // stack dumping signal handler). NO malloc or stdio is allowed here.
-
-  DEBUG_BREAK();
-#if defined(OS_ANDROID) && !defined(OFFICIAL_BUILD)
-  // For Android development we always build release (debug builds are
-  // unmanageably large), so the unofficial build is used for debugging. It is
-  // helpful to be able to insert BreakDebugger() statements in the source,
-  // attach the debugger, inspect the state of the program and then resume it by
-  // setting the 'go' variable above.
-#elif defined(NDEBUG)
-  // Terminate the program after signaling the debug break.
-  _exit(1);
-#endif
-}
-
-}  // namespace debug
-}  // namespace base