/*
* Dump the stack traces for all threads to the supplied file, putting
* a timestamp header on it.
*/
static void logThreadStacks(FILE* fp)
{
DebugOutputTarget target;
dvmCreateFileOutputTarget(&target, fp);
pid_t pid = getpid();
time_t now = time(NULL);
struct tm* ptm;
#ifdef HAVE_LOCALTIME_R
struct tm tmbuf;
ptm = localtime_r(&now, &tmbuf);
#else
ptm = localtime(&now);
#endif
dvmPrintDebugMessage(&target,
"\n\n----- pid %d at %04d-%02d-%02d %02d:%02d:%02d -----\n",
pid, ptm->tm_year + 1900, ptm->tm_mon+1, ptm->tm_mday,
ptm->tm_hour, ptm->tm_min, ptm->tm_sec);
printProcessName(&target);
dvmPrintDebugMessage(&target, "\n");
dvmDumpJniStats(&target);
dvmDumpAllThreadsEx(&target, true);
fprintf(fp, "----- end %d -----\n", pid);
}
/*
* Dump the stack traces for all threads to the log or to a file. If it's
* to a file we have a little setup to do.
*/
static void logThreadStacks(void)
{
DebugOutputTarget target;
if (gDvm.stackTraceFile == NULL) {
/* just dump to log file */
dvmCreateLogOutputTarget(&target, ANDROID_LOG_INFO, LOG_TAG);
dvmDumpAllThreadsEx(&target, true);
} else {
FILE* fp = NULL;
int cc, fd;
/*
* Open the stack trace output file, creating it if necessary. It
* needs to be world-writable so other processes can write to it.
*/
fd = open(gDvm.stackTraceFile, O_WRONLY | O_APPEND | O_CREAT, 0666);
if (fd < 0) {
LOGE("Unable to open stack trace file '%s': %s\n",
gDvm.stackTraceFile, strerror(errno));
return;
}
/* gain exclusive access to the file */
cc = flock(fd, LOCK_EX | LOCK_UN);
if (cc != 0) {
LOGV("Sleeping on flock(%s)\n", gDvm.stackTraceFile);
cc = flock(fd, LOCK_EX);
}
if (cc != 0) {
LOGE("Unable to lock stack trace file '%s': %s\n",
gDvm.stackTraceFile, strerror(errno));
close(fd);
return;
}
fp = fdopen(fd, "a");
if (fp == NULL) {
LOGE("Unable to fdopen '%s' (%d): %s\n",
gDvm.stackTraceFile, fd, strerror(errno));
flock(fd, LOCK_UN);
close(fd);
return;
}
dvmCreateFileOutputTarget(&target, fp);
pid_t pid = getpid();
time_t now = time(NULL);
struct tm* ptm;
#ifdef HAVE_LOCALTIME_R
struct tm tmbuf;
ptm = localtime_r(&now, &tmbuf);
#else
ptm = localtime(&now);
#endif
dvmPrintDebugMessage(&target,
"\n\n----- pid %d at %04d-%02d-%02d %02d:%02d:%02d -----\n",
pid, ptm->tm_year + 1900, ptm->tm_mon+1, ptm->tm_mday,
ptm->tm_hour, ptm->tm_min, ptm->tm_sec);
printProcessName(&target);
dvmPrintDebugMessage(&target, "\n");
fflush(fp); /* emit at least the header if we crash during dump */
dvmDumpAllThreadsEx(&target, true);
fprintf(fp, "----- end %d -----\n", pid);
/*
* Unlock and close the file, flushing pending data before we unlock
* it. The fclose() will close the underyling fd.
*/
fflush(fp);
flock(fd, LOCK_UN);
fclose(fp);
LOGI("Wrote stack trace to '%s'\n", gDvm.stackTraceFile);
}
}
/*
* Respond to a SIGQUIT by dumping the thread stacks. Optionally dump
* a few other things while we're at it.
*
* Thread stacks can either go to the log or to a file designated for holding
* ANR traces. If we're writing to a file, we want to do it in one shot,
* so we can use a single O_APPEND write instead of contending for exclusive
* access with flock(). There may be an advantage in resuming the VM
* before doing the file write, so we don't stall the VM if disk I/O is
* bottlenecked.
*
* If JIT tuning is compiled in, dump compiler stats as well.
*/
static void handleSigQuit()
{
char* traceBuf = NULL;
size_t traceLen;
dvmSuspendAllThreads(SUSPEND_FOR_STACK_DUMP);
dvmDumpLoaderStats("sig");
if (gDvm.stackTraceFile == NULL) {
/* just dump to log */
DebugOutputTarget target;
dvmCreateLogOutputTarget(&target, ANDROID_LOG_INFO, LOG_TAG);
dvmDumpJniStats(&target);
dvmDumpAllThreadsEx(&target, true);
} else {
/* write to memory buffer */
FILE* memfp = open_memstream(&traceBuf, &traceLen);
if (memfp == NULL) {
ALOGE("Unable to create memstream for stack traces");
traceBuf = NULL; /* make sure it didn't touch this */
/* continue on */
} else {
logThreadStacks(memfp);
fclose(memfp);
}
}
#if defined(WITH_JIT) && defined(WITH_JIT_TUNING)
dvmCompilerDumpStats();
#endif
if (false) dvmDumpTrackedAllocations(true);
dvmResumeAllThreads(SUSPEND_FOR_STACK_DUMP);
if (traceBuf != NULL) {
/*
* We don't know how long it will take to do the disk I/O, so put us
* into VMWAIT for the duration.
*/
ThreadStatus oldStatus = dvmChangeStatus(dvmThreadSelf(), THREAD_VMWAIT);
/*
* Open the stack trace output file, creating it if necessary. It
* needs to be world-writable so other processes can write to it.
*/
int fd = open(gDvm.stackTraceFile, O_WRONLY | O_APPEND | O_CREAT, 0666);
if (fd < 0) {
ALOGE("Unable to open stack trace file '%s': %s",
gDvm.stackTraceFile, strerror(errno));
} else {
ssize_t actual = write(fd, traceBuf, traceLen);
if (actual != (ssize_t) traceLen) {
ALOGE("Failed to write stack traces to %s (%d of %zd): %s",
gDvm.stackTraceFile, (int) actual, traceLen,
strerror(errno));
} else {
ALOGI("Wrote stack traces to '%s'", gDvm.stackTraceFile);
}
close(fd);
}
free(traceBuf);
dvmChangeStatus(dvmThreadSelf(), oldStatus);
}
}
