2b2ae0c88e
Reduce the amount of time that a process remains paused by pausing its threads, fetching their registers, and then performing unwinding on a copy of its address space. This also works around a kernel change that's in 4.9 that prevents ptrace from reading memory of processes that we don't have immediate permissions to ptrace (even if we previously ptraced them). Bug: http://b/62112103 Bug: http://b/63989615 Test: treehugger Change-Id: I7b9cc5dd8f54a354bc61f1bda0d2b7a8a55733c4
89 lines
2.6 KiB
C++
89 lines
2.6 KiB
C++
/*
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* Copyright 2016, The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <signal.h>
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#include <stdint.h>
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#include <sys/ucontext.h>
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#include <unistd.h>
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#include "dump_type.h"
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// Sockets in the ANDROID_SOCKET_NAMESPACE_RESERVED namespace.
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// Both sockets are SOCK_SEQPACKET sockets, so no explicit length field is needed.
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constexpr char kTombstonedCrashSocketName[] = "tombstoned_crash";
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constexpr char kTombstonedJavaTraceSocketName[] = "tombstoned_java_trace";
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constexpr char kTombstonedInterceptSocketName[] = "tombstoned_intercept";
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enum class CrashPacketType : uint8_t {
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// Initial request from crash_dump.
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kDumpRequest = 0,
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// Notification of a completed crash dump.
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// Sent after a dump is completed and the process has been untraced, but
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// before it has been resumed with SIGCONT.
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kCompletedDump,
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// Responses to kRequest.
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// kPerformDump sends along an output fd via cmsg(3).
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kPerformDump = 128,
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kAbortDump,
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};
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struct DumpRequest {
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DebuggerdDumpType dump_type;
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int32_t pid;
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};
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// The full packet must always be written, regardless of whether the union is used.
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struct TombstonedCrashPacket {
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CrashPacketType packet_type;
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union {
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DumpRequest dump_request;
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} packet;
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};
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// Comes with a file descriptor via SCM_RIGHTS.
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// This packet should be sent before an actual dump happens.
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struct InterceptRequest {
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DebuggerdDumpType dump_type;
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int32_t pid;
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};
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enum class InterceptStatus : uint8_t {
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// Returned when an intercept of a different type has already been
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// registered (and is active) for a given PID.
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kFailedAlreadyRegistered,
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// Returned in all other failure cases.
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kFailed,
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kStarted,
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kRegistered,
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};
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// Sent either immediately upon failure, or when the intercept has been used.
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struct InterceptResponse {
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InterceptStatus status;
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char error_message[127]; // always null-terminated
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};
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// Sent from handler to crash_dump via pipe.
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struct __attribute__((__packed__)) CrashInfo {
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uint32_t version; // must be 1.
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siginfo_t siginfo;
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ucontext_t ucontext;
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uintptr_t abort_msg_address;
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};
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