#include <errno.h>
#include <sys/capability.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <cutils/properties.h>
#include <cutils/sched_policy.h>
#include <log/log.h>
#include <sys/resource.h>
#include <utils/threads.h>
#include <pdx/default_transport/service_dispatcher.h>
#include <private/android_filesystem_config.h>
#include "performance_service.h"
namespace {
// Annoying that sys/capability.h doesn't define this directly.
constexpr int kMaxCapNumber = (CAP_TO_INDEX(CAP_LAST_CAP) + 1);
} // anonymous namespace
int main(int /*argc*/, char** /*argv*/) {
int ret = -1;
struct __user_cap_header_struct capheader;
struct __user_cap_data_struct capdata[kMaxCapNumber];
std::shared_ptr<android::pdx::Service> service;
std::unique_ptr<android::pdx::ServiceDispatcher> dispatcher;
ALOGI("Starting up...");
// We need to be able to create endpoints with full perms.
umask(0000);
// Keep capabilities when switching UID to AID_SYSTEM.
ret = prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0);
CHECK_ERROR(ret < 0, error, "Failed to set KEEPCAPS: %s", strerror(errno));
// Set UID and GID to system.
ret = setresgid(AID_SYSTEM, AID_SYSTEM, AID_SYSTEM);
CHECK_ERROR(ret < 0, error, "Failed to set GID: %s", strerror(errno));
ret = setresuid(AID_SYSTEM, AID_SYSTEM, AID_SYSTEM);
CHECK_ERROR(ret < 0, error, "Failed to set UID: %s", strerror(errno));
// Keep CAP_SYS_NICE, allowing control of scheduler class, priority, and
// cpuset for other tasks in the system.
memset(&capheader, 0, sizeof(capheader));
memset(&capdata, 0, sizeof(capdata));
capheader.version = _LINUX_CAPABILITY_VERSION_3;
capdata[CAP_TO_INDEX(CAP_SYS_NICE)].effective |= CAP_TO_MASK(CAP_SYS_NICE);
capdata[CAP_TO_INDEX(CAP_SYS_NICE)].permitted |= CAP_TO_MASK(CAP_SYS_NICE);
// Drop all caps but the ones configured above.
ret = capset(&capheader, capdata);
CHECK_ERROR(ret < 0, error, "Could not set capabilities: %s",
strerror(errno));
dispatcher = android::pdx::default_transport::ServiceDispatcher::Create();
CHECK_ERROR(!dispatcher, error, "Failed to create service dispatcher.");
service = android::dvr::PerformanceService::Create();
CHECK_ERROR(!service, error, "Failed to create performance service service.");
dispatcher->AddService(service);
ALOGI("Entering message loop.");
ret = dispatcher->EnterDispatchLoop();
CHECK_ERROR(ret < 0, error, "Dispatch loop exited because: %s\n",
strerror(-ret));
error:
return ret;
}