#include <signal.h>
int sigaction(int signum,const struct

sigaction *act,struct sigaction *oldact));

struct sigaction sa_old;
memset(&sa, 0, sizeof(sa));
sigemptyset(&sa.sa_mask);
sa.sa_sigaction = my_handler;
sa.sa_flags = SA_SIGINFO;
if (sigaction(sig, &sa, &sa_old) == 0) {
...
}

#include <signal.h>
int sigaltstack(const stack_t *ss,

stack_t *oss);

stack_t stack;
memset(&stack, 0, sizeof(stack));
/* Reserver the system default stack size.

We don't need that much by the way. */
stack.ss_size = SIGSTKSZ;
stack.ss_sp = malloc(stack.ss_size);
stack.ss_flags = 0;
/* Install alternate stack size. Be sure

the memory region is valid until you revert it. */
if (stack.ss_sp != NULL && sigaltstack

(&stack, NULL) == 0) {
...
}

static void my_handler(const int code, siginfo_t

*const si, void *const sc) {
...
/* Call previous handler. */
old_handler.sa_sigaction(code, si, sc);
}

static void signal_handler(const int code, siginfo_t

*const si,
void *const sc) {

/* Ensure we do not deadlock. Default of

ALRM is to die.
* (signal() and alarm() are signal-safe) */
signal(code, SIG_DFL);
signal(SIGALRM, SIG_DFL);

/* Ensure we do not deadlock. Default of

ALRM is to die.
* (signal() and alarm() are signal-safe) */
(void) alarm(8);
....
}

static void nativeInit(JNIEnv* env, jclass

javaClass, jstring packageNameStr, jstring

tombstoneFilePathStr, jobject obj) {
...
initCondition();

pthread_t thd;
int ret = pthread_create(&thd, NULL,

DumpThreadEntry, NULL); if(ret) {
qmlog("%s", "pthread_create error");
}
}

void* DumpThreadEntry(void *argv) {
JNIEnv* env = NULL;
if((*g_jvm)->AttachCurrentThread(g_jvm,

&env, NULL) != JNI_OK)
{
LOGE("AttachCurrentThread() failed");
estatus = 0;
return &estatus;
}

while (true) {
//µÈ´ýÐźŴ¦Àíº¯Êý»½ÐÑ
waitForSignal();

//»Øµ÷nativeÒì³£¶ÑÕ»¸øjava²ã
throw_exception(env);

//¸æËßÐźŴ¦Àíº¯ÊýÒѾ­´¦ÀíÍêÁË
notifyThrowException();
}

if((*g_jvm)->DetachCurrentThread(g_jvm)

!= JNI_OK)
{
LOGE("DetachCurrentThread() failed");
estatus = 0;
return &estatus;
}

return &estatus;
}

/*ÐźŴ¦Àíº¯Êý*/

void (*sa_sigaction)(const int code,

siginfo_t *const si, void * const sc)

siginfo_t {
int si_signo; /* Signal number ÐźÅÁ¿ */
int si_errno; /* An errno value */
int si_code; /* Signal code ´íÎóÂë */
}

case SIGFPE:
switch(code) {
case FPE_INTDIV:
return "Integer divide by zero";
case FPE_INTOVF:
return "Integer overflow";
case FPE_FLTDIV:
return "Floating-point divide by zero";
case FPE_FLTOVF:
return "Floating-point overflow";
case FPE_FLTUND:
return "Floating-point underflow";
case FPE_FLTRES:
return "Floating-point inexact result";
case FPE_FLTINV:
return "Invalid floating-point operation";
case FPE_FLTSUB:
return "Subscript out of range";
default:
return "Floating-point";
}
break;
case SIGSEGV:
switch(code) {
case SEGV_MAPERR:
return "Address not mapped to object";
case SEGV_ACCERR:
return "Invalid permissions for mapped object";
default:
return "Segmentation violation";
}
break;

Dl_info info;
if (dladdr(addr, &info) != 0 && info.dli_

fname != NULL) {
void * const nearest = info.dli_saddr;
//Ïà¶ÔÆ«ÒƵØÖ·
const uintptr_t addr_relative =
((uintptr_t) addr - (uintptr_t) info.dli_fbase);
...
}

#ifdef USE_UNWIND
/* Frame buffer initial position. */
t->frames_size = 0;

/* Skip us and the caller. */
t->frames_skip = 0;

/* ʹÓÃlibcorkscrew½â¶ÑÕ» */
#ifdef USE_CORKSCREW
t->frames_size = backtrace_signal(si, sc,

t->frames, 0, BACKTRACE_FRAMES_MAX);
#else
/* Unwind frames (equivalent to backtrace()) */
_Unwind_Backtrace(coffeecatch_unwind_callback, t);
#endif

/* Èç¹ûÎÞ·¨¼ÓÔØlibcorkscrew£¬ÔòʹÓÃ×Ô¼º±àÒëµÄ

libunwind½â¶ÑÕ» */

#ifdef USE_LIBUNWIND
if (t->frames_size == 0) {
size_t i;
t->frames_size = unwind_signal(si, sc,

t->uframes, 0,BACKTRACE_FRAMES_MAX);
for(i = 0 ; i < t->frames_size ; i++) {
t->frames[i].absolute_pc = (uintptr_t)

t->uframes[i];
t->frames[i].stack_top = 0;
t->frames[i].stack_size = 0;
__android_log_print(ANDROID_LOG_DEBUG, TAG, "absolute_pc:%x", t->frames[i].absolute_pc);
}
}
#endif

static ALWAYS_INLINE int
slow_backtrace (void **buffer, int size,

unw_context_t *uc)
{
unw_cursor_t cursor;
unw_word_t ip;
int n = 0;

if (unlikely (unw_init_local (&cursor, uc) < 0))
return 0;

while (unw_step (&cursor) > 0)
{
if (n >= size)
return n;
if (unw_get_reg (&cursor, UNW_REG_IP, &ip) < 0)
return n;
buffer[n++] = (void *) (uintptr_t) ip;
}
return n;
}

/*
* Describes the symbols associated with a

backtrace frame.
*/
typedef struct {
uintptr_t relative_pc;
uintptr_t relative_symbol_addr;
char* map_name;
char* symbol_name;
char* demangled_name;
} backtrace_symbol_t;

/*
* Gets the symbols for each frame of a backtrace.
* The symbols array must be big enough to

hold one symbol record per frame.
* The symbols must later be freed using

free_backtrace_symbols.
*/

void get_backtrace_symbols(const

backtrace_frame_t* backtrace, size_t frames,
backtrace_symbol_t* backtrace_symbols);

int dladdr(void *addr, Dl_info *info);

typedef struct {
const char *dli_fname; /* Pathname of shared object that
contains address */
void *dli_fbase; /* Base address at which shared
object is loaded */
const char *dli_sname; /* Name of symbol whose definition
overlaps addr */
void *dli_saddr; /* Exact address of symbol named
in dli_sname */
} Dl_info;

char* getThreadName(pid_t tid) {
if (tid <= 1) {
return NULL;
}
char* path = (char *) calloc(1, 80);
char* line = (char *) calloc(1, THREAD_NAME_LENGTH);

snprintf(path, PATH_MAX, "proc/%d/comm", tid);
FILE* commFile = NULL;
if (commFile = fopen(path, "r")) {
fgets(line, THREAD_NAME_LENGTH, commFile);
fclose(commFile);
}
free(path);
if (line) {
int length = strlen(line);
if (line[length - 1] == '\n') {
line[length - 1] = '\0';
}
}
return line;
}

/**
* ¸ù¾ÝÏß³ÌÃû»ñµÃÏ̶߳ÔÏó£¬native²ã»áµ÷Óø÷½·¨£¬

²»ÄÜ»ìÏý
* @param threadName
* @return
*/
@Keep
public static Thread getThreadByName(String

threadName) {
if (TextUtils.isEmpty(threadName)) {
return null;
}

Set<Thread> threadSet = Thread.getAllStackTraces().keySet();
Thread[] threadArray = threadSet.

toArray(new Thread[threadSet.size()]);

Thread theThread = null;
for(Thread thread : threadArray) {
if (thread.getName().equals(threadName)) {
theThread = thread;
}
}

Log.d(TAG, "threadName: " + threadName

+ ", thread: " + theThread);
return theThread;
}

java.lang.Error: signal 11 (Address not mapped

to object) at address 0x0
at dalvik.system.NativeStart.run(Native Method)
Caused by: java.lang.Error: signal 11 (Address not

mapped to object) at address 0x0
at /data/app-lib/com.tencent.moai.crashcatcher.

demo-1/libQMCrashGenerator.so.0xd8e(dangerous

Function:0x5:0)
at /data/app-lib/com.tencent.moai.crashcatcher.demo-1/libQMCrashGenerator.so.0xd95(wrapDangerou

sFunction:0x2:0)
at /data/app-lib/com.tencent.moai.crashcatcher.

demo-1/libQMCrashGenerator.so.0xd9d(nativeInvalid

AddressCrash:0x2:0)
at /system/lib/libdvm.so.0x1ee8c(dvmPlatformI

nvoke:0x70:0)
at /system/lib/libdvm.so.0x503b7(dvmCallJNI

Method(unsigned

int const*, JValue*, Method const*, Thread*):0x1ee:0)
at /system/lib/libdvm.so.0x28268(Native Method)
at /system/lib/libdvm.so.0x2f738(dvmMterpStd

(Thread*):0x44:0)
at /system/lib/libdvm.so.0x2cda8(dvmInterpret

(Thread*, Method const*, JValue*):0xb8:0)
at /system/lib/libdvm.so.0x648e3(dvmInvokeMethod

(Object*,

Method const*, ArrayObject*, ArrayObject*,

ClassObject*,

bool):0x1aa:0)
at /system/lib/libdvm.so.0x6cff9(Native Method)
at /system/lib/libdvm.so.0x28268(Native Method)
at /system/lib/libdvm.so.0x2f738(dvmMterpStd(Thread*)

:0x44:0)
at /system/lib/libdvm.so.0x2cda8(dvmInterpret(Thread*,

Method const*, JValue*):0xb8:0)
at /system/lib/libdvm.so.0x643d9(dvmCallMethodV(Thread*,

Method const*, Object*, bool, JValue*, std::__va_list):

0x14c:0)
at /system/lib/libdvm.so.0x4bca1(Native Method)
at /system/lib/libandroid_runtime.so.0x50ac3(Native

Method)
at /system/lib/libandroid_runtime.so.0x518e7(android::

AndroidRuntime::start(char const*, char const*):

0x206:0)
at /system/bin/app_process.0xf33(Native Method)
at /system/lib/libc.so.0xf584(__libc_init:0x64:0)
at /system/bin/app_process.0x107c(Native Method)
Caused by: java.lang.Error: java stack
at com.tencent.crashcatcher.CrashCatcher.nativeInvali

dAddressCrash(Native Method)
at com.tencent.crashcatcher.CrashCatcher.invalid

AddressCrash

(CrashCatcher.java:33)
at com.tencent.moai.crashcatcher.demo.MainActivity$4.

onClick

(MainActivity.java:56)
at android.view.View.performClick(View.java:4488)
at android.view.View$PerformClick.run(View.java:18860)
at android.os.Handler.handleCallback(Handler.java:808)
at android.os.Handler.dispatchMessage(Handler.java:103)
at android.os.Looper.loop(Looper.java:222)
at android.app.ActivityThread.main(ActivityThread.

java:5484)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgs

Caller.run

(ZygoteInit.java:860)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.

java:676)
at dalvik.system.NativeStart.main(Native Method)

public interface CrashHandleListener {
@Keep
void onCrash(int id, Error e);
}

#00 pc 00039874 /system/lib/libc.so (tgkill+12)
#01 pc 00013b5d /system/lib/libc.so (pthread_kill+52)
#02 pc 0001477b /system/lib/libc.so (raise+10)
#03 pc 00010ff5 /system/lib/libc.so (__libc_

android_abort+36)
#04 pc 0000f554 /system/lib/libc.so (abort+4)
#05 pc 00239885 /system/lib/libwebviewchromium.so
#06 pc 00219da3 /system/lib/libwebviewchromium.so
#07 pc 00206459 /system/lib/libwebviewchromium.so
#08 pc 001fb6c7 /system/lib/libwebviewchromium.so
#09 pc 001edc97 /system/lib/libwebviewchromium.so
#10 pc 001ec5ad /system/lib/libwebviewchromium.so
#11 pc 001ec617 /system/lib/libwebviewchromium.so
#12 pc 001ec5e5 /system/lib/libwebviewchromium.so
#13 pc 001ec5bf /system/lib/libwebviewchromium.so
#14 pc 0022c941 /system/lib/libwebviewchromium.so
#15 pc 0022c92b /system/lib/libwebviewchromium.so
#16 pc 0022e6a1 /system/lib/libwebviewchromium.so
#17 pc 0022ebcd /system/lib/libwebviewchromium.so
#18 pc 0022ee1d /system/lib/libwebviewchromium.so
#19 pc 0022c511 /system/lib/libwebviewchromium.so
#20 pc 00013347 /system/lib/libc.so (_ZL15__pthread

_startPv+30)
#21 pc 0001135f /system/lib/libc.so (__start_thread+6)

05-21 15:09:28.423 W/System.err(16811): java.lang.

NullPointerException: Attempt to get length of

null array
05-21 15:09:28.424 W/System.err(16811): at java.io.ByteArrayInputStream.<init>(ByteArray

InputStream.java:60)
05-21 15:09:28.424 W/System.err(16811): at com.tencent.*.InlineImage.fetcher.HttpImageFetcher

.fetchFrom

Network(HttpImageFetcher.java:86)
05-21 15:09:28.424 W/System.err(16811): at com.tencent.*.InlineImage.fetcher.BaseFetcher.fetch

(BaseFetcher.

java:24)
05-21 15:09:28.424 W/System.err(16811): at com.tencent.*.InlineImage.delaystream.DelayInput

Stream.read

(DelayInputStream.java:36)
05-21 15:09:28.424 W/System.err(16811): at com.tencent.*.InlineImage.delaystream.DelayHttpInput

Stream.read

(DelayHttpInputStream.java:12)
05-21 15:09:28.424 W/System.err(16811): at java.io.

InputStream.

read(InputStream.java:181)
05-21 15:09:28.424 W/System.err(16811): at org.chromium.android_webview.InputStreamUtil.read

(InputStream

Util.java:54)