1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/ipc/chromium/src/base/debug_util_posix.cc Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,187 @@
1.4 +// Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
1.5 +// Use of this source code is governed by a BSD-style license that can be
1.6 +// found in the LICENSE file.
1.7 +
1.8 +#include "build/build_config.h"
1.9 +#include "base/debug_util.h"
1.10 +
1.11 +#define MOZ_HAVE_EXECINFO_H (defined(OS_LINUX) && !defined(ANDROID))
1.12 +
1.13 +#include <errno.h>
1.14 +#include <fcntl.h>
1.15 +#include <stdio.h>
1.16 +#include <limits.h>
1.17 +#include <sys/stat.h>
1.18 +#include <sys/param.h>
1.19 +#include <sys/types.h>
1.20 +#include <unistd.h>
1.21 +#if MOZ_HAVE_EXECINFO_H
1.22 +#include <execinfo.h>
1.23 +#endif
1.24 +
1.25 +#if defined(OS_MACOSX) || defined(OS_BSD)
1.26 +#if defined(OS_OPENBSD)
1.27 +#include <sys/proc.h>
1.28 +#endif
1.29 +#include <sys/sysctl.h>
1.30 +#endif
1.31 +
1.32 +#if defined(OS_DRAGONFLY) || defined(OS_FREEBSD)
1.33 +#include <sys/user.h>
1.34 +#endif
1.35 +
1.36 +#include "base/basictypes.h"
1.37 +#include "base/eintr_wrapper.h"
1.38 +#include "base/logging.h"
1.39 +#include "base/scoped_ptr.h"
1.40 +#include "base/string_piece.h"
1.41 +
1.42 +#if defined(OS_NETBSD)
1.43 +#undef KERN_PROC
1.44 +#define KERN_PROC KERN_PROC2
1.45 +#define KINFO_PROC struct kinfo_proc2
1.46 +#else
1.47 +#define KINFO_PROC struct kinfo_proc
1.48 +#endif
1.49 +
1.50 +#if defined(OS_MACOSX)
1.51 +#define KP_FLAGS kp_proc.p_flag
1.52 +#elif defined(OS_DRAGONFLY)
1.53 +#define KP_FLAGS kp_flags
1.54 +#elif defined(OS_FREEBSD)
1.55 +#define KP_FLAGS ki_flag
1.56 +#elif defined(OS_OPENBSD) && !defined(_P_TRACED)
1.57 +#define KP_FLAGS p_psflags
1.58 +#define P_TRACED PS_TRACED
1.59 +#else
1.60 +#define KP_FLAGS p_flag
1.61 +#endif
1.62 +
1.63 +// static
1.64 +bool DebugUtil::SpawnDebuggerOnProcess(unsigned /* process_id */) {
1.65 + NOTIMPLEMENTED();
1.66 + return false;
1.67 +}
1.68 +
1.69 +#if defined(OS_MACOSX) || defined(OS_BSD)
1.70 +
1.71 +// Based on Apple's recommended method as described in
1.72 +// http://developer.apple.com/qa/qa2004/qa1361.html
1.73 +// static
1.74 +bool DebugUtil::BeingDebugged() {
1.75 + // If the process is sandboxed then we can't use the sysctl, so cache the
1.76 + // value.
1.77 + static bool is_set = false;
1.78 + static bool being_debugged = false;
1.79 +
1.80 + if (is_set) {
1.81 + return being_debugged;
1.82 + }
1.83 +
1.84 + // Initialize mib, which tells sysctl what info we want. In this case,
1.85 + // we're looking for information about a specific process ID.
1.86 + int mib[] = {
1.87 + CTL_KERN,
1.88 + KERN_PROC,
1.89 + KERN_PROC_PID,
1.90 + getpid(),
1.91 +#if defined(OS_NETBSD) || defined(OS_OPENBSD)
1.92 + sizeof(KINFO_PROC),
1.93 + 1,
1.94 +#endif
1.95 + };
1.96 +
1.97 + // Caution: struct kinfo_proc is marked __APPLE_API_UNSTABLE. The source and
1.98 + // binary interfaces may change.
1.99 + KINFO_PROC info;
1.100 + size_t info_size = sizeof(info);
1.101 +
1.102 + int sysctl_result = sysctl(mib, arraysize(mib), &info, &info_size, NULL, 0);
1.103 + DCHECK(sysctl_result == 0);
1.104 + if (sysctl_result != 0) {
1.105 + is_set = true;
1.106 + being_debugged = false;
1.107 + return being_debugged;
1.108 + }
1.109 +
1.110 + // This process is being debugged if the P_TRACED flag is set.
1.111 + is_set = true;
1.112 + being_debugged = (info.KP_FLAGS & P_TRACED) != 0;
1.113 + return being_debugged;
1.114 +}
1.115 +
1.116 +#elif defined(OS_LINUX)
1.117 +
1.118 +// We can look in /proc/self/status for TracerPid. We are likely used in crash
1.119 +// handling, so we are careful not to use the heap or have side effects.
1.120 +// Another option that is common is to try to ptrace yourself, but then we
1.121 +// can't detach without forking(), and that's not so great.
1.122 +// static
1.123 +bool DebugUtil::BeingDebugged() {
1.124 + int status_fd = open("/proc/self/status", O_RDONLY);
1.125 + if (status_fd == -1)
1.126 + return false;
1.127 +
1.128 + // We assume our line will be in the first 1024 characters and that we can
1.129 + // read this much all at once. In practice this will generally be true.
1.130 + // This simplifies and speeds up things considerably.
1.131 + char buf[1024];
1.132 +
1.133 + ssize_t num_read = HANDLE_EINTR(read(status_fd, buf, sizeof(buf)));
1.134 + HANDLE_EINTR(close(status_fd));
1.135 +
1.136 + if (num_read <= 0)
1.137 + return false;
1.138 +
1.139 + StringPiece status(buf, num_read);
1.140 + StringPiece tracer("TracerPid:\t");
1.141 +
1.142 + StringPiece::size_type pid_index = status.find(tracer);
1.143 + if (pid_index == StringPiece::npos)
1.144 + return false;
1.145 +
1.146 + // Our pid is 0 without a debugger, assume this for any pid starting with 0.
1.147 + pid_index += tracer.size();
1.148 + return pid_index < status.size() && status[pid_index] != '0';
1.149 +}
1.150 +
1.151 +#endif // OS_LINUX
1.152 +
1.153 +// static
1.154 +void DebugUtil::BreakDebugger() {
1.155 +#if defined(ARCH_CPU_X86_FAMILY)
1.156 + asm ("int3");
1.157 +#endif
1.158 +}
1.159 +
1.160 +StackTrace::StackTrace() {
1.161 + const int kMaxCallers = 256;
1.162 +
1.163 + void* callers[kMaxCallers];
1.164 +#if MOZ_HAVE_EXECINFO_H
1.165 + int count = backtrace(callers, kMaxCallers);
1.166 +#else
1.167 + int count = 0;
1.168 +#endif
1.169 +
1.170 + // Though the backtrace API man page does not list any possible negative
1.171 + // return values, we still still exclude them because they would break the
1.172 + // memcpy code below.
1.173 + if (count > 0) {
1.174 + trace_.resize(count);
1.175 + memcpy(&trace_[0], callers, sizeof(callers[0]) * count);
1.176 + } else {
1.177 + trace_.resize(0);
1.178 + }
1.179 +}
1.180 +
1.181 +void StackTrace::PrintBacktrace() {
1.182 + fflush(stderr);
1.183 +#if MOZ_HAVE_EXECINFO_H
1.184 + backtrace_symbols_fd(&trace_[0], trace_.size(), STDERR_FILENO);
1.185 +#endif
1.186 +}
1.187 +
1.188 +void StackTrace::OutputToStream(std::ostream* os) {
1.189 + return;
1.190 +}
