/*
* Command that dumps interesting system state to the log.
*
*/
#define LOG_TAG "dumpsys"
#include <algorithm>
#include <chrono>
#include <thread>
#include <android-base/file.h>
#include <android-base/unique_fd.h>
#include <binder/IServiceManager.h>
#include <binder/Parcel.h>
#include <binder/ProcessState.h>
#include <binder/TextOutput.h>
#include <utils/Log.h>
#include <utils/Vector.h>
#include <fcntl.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/poll.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
using namespace android;
using android::base::unique_fd;
using android::base::WriteFully;
static int sort_func(const String16* lhs, const String16* rhs)
{
return lhs->compare(*rhs);
}
static void usage() {
fprintf(stderr,
"usage: dumpsys\n"
" To dump all services.\n"
"or:\n"
" dumpsys [-t TIMEOUT] [--help | -l | --skip SERVICES | SERVICE [ARGS]]\n"
" --help: shows this help\n"
" -l: only list services, do not dump them\n"
" -t TIMEOUT: TIMEOUT to use in seconds instead of default 10 seconds\n"
" --skip SERVICES: dumps all services but SERVICES (comma-separated list)\n"
" SERVICE [ARGS]: dumps only service SERVICE, optionally passing ARGS to it\n");
}
bool IsSkipped(const Vector<String16>& skipped, const String16& service) {
for (const auto& candidate : skipped) {
if (candidate == service) {
return true;
}
}
return false;
}
int main(int argc, char* const argv[])
{
signal(SIGPIPE, SIG_IGN);
sp<IServiceManager> sm = defaultServiceManager();
fflush(stdout);
if (sm == NULL) {
ALOGE("Unable to get default service manager!");
aerr << "dumpsys: Unable to get default service manager!" << endl;
return 20;
}
Vector<String16> services;
Vector<String16> args;
Vector<String16> skippedServices;
bool showListOnly = false;
bool skipServices = false;
int timeoutArg = 10;
static struct option longOptions[] = {
{"skip", no_argument, 0, 0 },
{"help", no_argument, 0, 0 },
{ 0, 0, 0, 0 }
};
while (1) {
int c;
int optionIndex = 0;
c = getopt_long(argc, argv, "+t:l", longOptions, &optionIndex);
if (c == -1) {
break;
}
switch (c) {
case 0:
if (!strcmp(longOptions[optionIndex].name, "skip")) {
skipServices = true;
} else if (!strcmp(longOptions[optionIndex].name, "help")) {
usage();
return 0;
}
break;
case 't':
{
char *endptr;
timeoutArg = strtol(optarg, &endptr, 10);
if (*endptr != '\0' || timeoutArg <= 0) {
fprintf(stderr, "Error: invalid timeout number: '%s'\n", optarg);
return -1;
}
}
break;
case 'l':
showListOnly = true;
break;
default:
fprintf(stderr, "\n");
usage();
return -1;
}
}
for (int i = optind; i < argc; i++) {
if (skipServices) {
skippedServices.add(String16(argv[i]));
} else {
if (i == optind) {
services.add(String16(argv[i]));
} else {
args.add(String16(argv[i]));
}
}
}
if ((skipServices && skippedServices.empty()) ||
(showListOnly && (!services.empty() || !skippedServices.empty()))) {
usage();
return -1;
}
if (services.empty() || showListOnly) {
// gets all services
services = sm->listServices();
services.sort(sort_func);
args.add(String16("-a"));
}
const size_t N = services.size();
if (N > 1) {
// first print a list of the current services
aout << "Currently running services:" << endl;
for (size_t i=0; i<N; i++) {
sp<IBinder> service = sm->checkService(services[i]);
if (service != NULL) {
bool skipped = IsSkipped(skippedServices, services[i]);
aout << " " << services[i] << (skipped ? " (skipped)" : "") << endl;
}
}
}
if (showListOnly) {
return 0;
}
for (size_t i = 0; i < N; i++) {
String16 service_name = std::move(services[i]);
if (IsSkipped(skippedServices, service_name)) continue;
sp<IBinder> service = sm->checkService(service_name);
if (service != NULL) {
int sfd[2];
if (pipe(sfd) != 0) {
aerr << "Failed to create pipe to dump service info for " << service_name
<< ": " << strerror(errno) << endl;
continue;
}
unique_fd local_end(sfd[0]);
unique_fd remote_end(sfd[1]);
sfd[0] = sfd[1] = -1;
if (N > 1) {
aout << "------------------------------------------------------------"
"-------------------" << endl;
aout << "DUMP OF SERVICE " << service_name << ":" << endl;
}
// dump blocks until completion, so spawn a thread..
std::thread dump_thread([=, remote_end { std::move(remote_end) }]() mutable {
int err = service->dump(remote_end.get(), args);
// It'd be nice to be able to close the remote end of the socketpair before the dump
// call returns, to terminate our reads if the other end closes their copy of the
// file descriptor, but then hangs for some reason. There doesn't seem to be a good
// way to do this, though.
remote_end.clear();
if (err != 0) {
aerr << "Error dumping service info: (" << strerror(err) << ") " << service_name
<< endl;
}
});
auto timeout = std::chrono::seconds(timeoutArg);
auto end = std::chrono::steady_clock::now() + timeout;
struct pollfd pfd = {
.fd = local_end.get(),
.events = POLLIN
};
bool timed_out = false;
bool error = false;
while (true) {
// Wrap this in a lambda so that TEMP_FAILURE_RETRY recalculates the timeout.
auto time_left_ms = [end]() {
auto now = std::chrono::steady_clock::now();
auto diff = std::chrono::duration_cast<std::chrono::milliseconds>(end - now);
return std::max(diff.count(), 0ll);
};
int rc = TEMP_FAILURE_RETRY(poll(&pfd, 1, time_left_ms()));
if (rc < 0) {
aerr << "Error in poll while dumping service " << service_name << " : "
<< strerror(errno) << endl;
error = true;
break;
} else if (rc == 0) {
timed_out = true;
break;
}
char buf[4096];
rc = TEMP_FAILURE_RETRY(read(local_end.get(), buf, sizeof(buf)));
if (rc < 0) {
aerr << "Failed to read while dumping service " << service_name << ": "
<< strerror(errno) << endl;
error = true;
break;
} else if (rc == 0) {
// EOF.
break;
}
if (!WriteFully(STDOUT_FILENO, buf, rc)) {
aerr << "Failed to write while dumping service " << service_name << ": "
<< strerror(errno) << endl;
error = true;
break;
}
}
if (timed_out) {
aout << endl << "*** SERVICE DUMP TIMEOUT EXPIRED ***" << endl << endl;
}
if (timed_out || error) {
dump_thread.detach();
} else {
dump_thread.join();
}
} else {
aerr << "Can't find service: " << service_name << endl;
}
}
return 0;
}