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platform_system_core/init/init.cpp
Evgenii Stepanov 102daa30a3 Revert "Revert "init: create /dev/urandom, /dev/random in first stage."" 
This reverts commit 4c8a76e250.

Test: booted angler-userdebug

Change-Id: I2257a44b7cf624065e5653754062a117f3e44c98
2016-11-18 15:09:18 -08:00

749 lines
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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <libgen.h>
#include <paths.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/epoll.h>
#include <sys/mount.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/sysmacros.h>
#include <sys/types.h>
#include <sys/un.h>
#include <sys/wait.h>
#include <unistd.h>
#include <selinux/selinux.h>
#include <selinux/label.h>
#include <selinux/android.h>
#include <android-base/file.h>
#include <android-base/stringprintf.h>
#include <android-base/strings.h>
#include <cutils/android_reboot.h>
#include <cutils/fs.h>
#include <cutils/iosched_policy.h>
#include <cutils/list.h>
#include <cutils/sockets.h>
#include <private/android_filesystem_config.h>
#include <memory>
#include "action.h"
#include "bootchart.h"
#include "devices.h"
#include "fs_mgr.h"
#include "import_parser.h"
#include "init.h"
#include "init_parser.h"
#include "keychords.h"
#include "log.h"
#include "property_service.h"
#include "service.h"
#include "signal_handler.h"
#include "ueventd.h"
#include "util.h"
#include "watchdogd.h"
using android::base::StringPrintf;
struct selabel_handle *sehandle;
struct selabel_handle *sehandle_prop;
static int property_triggers_enabled = 0;
static char qemu[32];
std::string default_console = "/dev/console";
static time_t process_needs_restart_at;
const char *ENV[32];
bool waiting_for_exec = false;
static int epoll_fd = -1;
void register_epoll_handler(int fd, void (*fn)()) {
epoll_event ev;
ev.events = EPOLLIN;
ev.data.ptr = reinterpret_cast<void*>(fn);
if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fd, &ev) == -1) {
PLOG(ERROR) << "epoll_ctl failed";
}
}
/* add_environment - add "key=value" to the current environment */
int add_environment(const char *key, const char *val)
{
size_t n;
size_t key_len = strlen(key);
/* The last environment entry is reserved to terminate the list */
for (n = 0; n < (arraysize(ENV) - 1); n++) {
/* Delete any existing entry for this key */
if (ENV[n] != NULL) {
size_t entry_key_len = strcspn(ENV[n], "=");
if ((entry_key_len == key_len) && (strncmp(ENV[n], key, entry_key_len) == 0)) {
free((char*)ENV[n]);
ENV[n] = NULL;
}
}
/* Add entry if a free slot is available */
if (ENV[n] == NULL) {
char* entry;
asprintf(&entry, "%s=%s", key, val);
ENV[n] = entry;
return 0;
}
}
LOG(ERROR) << "No env. room to store: '" << key << "':'" << val << "'";
return -1;
}
void property_changed(const char *name, const char *value)
{
if (property_triggers_enabled)
ActionManager::GetInstance().QueuePropertyTrigger(name, value);
}
static void restart_processes()
{
process_needs_restart_at = 0;
ServiceManager::GetInstance().ForEachServiceWithFlags(SVC_RESTARTING, [](Service* s) {
s->RestartIfNeeded(&process_needs_restart_at);
});
}
void handle_control_message(const std::string& msg, const std::string& name) {
Service* svc = ServiceManager::GetInstance().FindServiceByName(name);
if (svc == nullptr) {
LOG(ERROR) << "no such service '" << name << "'";
return;
}
if (msg == "start") {
svc->Start();
} else if (msg == "stop") {
svc->Stop();
} else if (msg == "restart") {
svc->Restart();
} else {
LOG(ERROR) << "unknown control msg '" << msg << "'";
}
}
static int wait_for_coldboot_done_action(const std::vector<std::string>& args) {
Timer t;
LOG(VERBOSE) << "Waiting for " COLDBOOT_DONE "...";
// Any longer than 1s is an unreasonable length of time to delay booting.
// If you're hitting this timeout, check that you didn't make your
// sepolicy regular expressions too expensive (http://b/19899875).
if (wait_for_file(COLDBOOT_DONE, 1s)) {
LOG(ERROR) << "Timed out waiting for " COLDBOOT_DONE;
}
LOG(VERBOSE) << "Waiting for " COLDBOOT_DONE " took " << t.duration() << "s.";
return 0;
}
/*
* Writes 512 bytes of output from Hardware RNG (/dev/hw_random, backed
* by Linux kernel's hw_random framework) into Linux RNG's via /dev/urandom.
* Does nothing if Hardware RNG is not present.
*
* Since we don't yet trust the quality of Hardware RNG, these bytes are not
* mixed into the primary pool of Linux RNG and the entropy estimate is left
* unmodified.
*
* If the HW RNG device /dev/hw_random is present, we require that at least
* 512 bytes read from it are written into Linux RNG. QA is expected to catch
* devices/configurations where these I/O operations are blocking for a long
* time. We do not reboot or halt on failures, as this is a best-effort
* attempt.
*/
static int mix_hwrng_into_linux_rng_action(const std::vector<std::string>& args)
{
int result = -1;
int hwrandom_fd = -1;
int urandom_fd = -1;
char buf[512];
ssize_t chunk_size;
size_t total_bytes_written = 0;
hwrandom_fd = TEMP_FAILURE_RETRY(
open("/dev/hw_random", O_RDONLY | O_NOFOLLOW | O_CLOEXEC));
if (hwrandom_fd == -1) {
if (errno == ENOENT) {
LOG(ERROR) << "/dev/hw_random not found";
// It's not an error to not have a Hardware RNG.
result = 0;
} else {
PLOG(ERROR) << "Failed to open /dev/hw_random";
}
goto ret;
}
urandom_fd = TEMP_FAILURE_RETRY(
open("/dev/urandom", O_WRONLY | O_NOFOLLOW | O_CLOEXEC));
if (urandom_fd == -1) {
PLOG(ERROR) << "Failed to open /dev/urandom";
goto ret;
}
while (total_bytes_written < sizeof(buf)) {
chunk_size = TEMP_FAILURE_RETRY(
read(hwrandom_fd, buf, sizeof(buf) - total_bytes_written));
if (chunk_size == -1) {
PLOG(ERROR) << "Failed to read from /dev/hw_random";
goto ret;
} else if (chunk_size == 0) {
LOG(ERROR) << "Failed to read from /dev/hw_random: EOF";
goto ret;
}
chunk_size = TEMP_FAILURE_RETRY(write(urandom_fd, buf, chunk_size));
if (chunk_size == -1) {
PLOG(ERROR) << "Failed to write to /dev/urandom";
goto ret;
}
total_bytes_written += chunk_size;
}
LOG(INFO) << "Mixed " << total_bytes_written << " bytes from /dev/hw_random into /dev/urandom";
result = 0;
ret:
if (hwrandom_fd != -1) {
close(hwrandom_fd);
}
if (urandom_fd != -1) {
close(urandom_fd);
}
return result;
}
static int keychord_init_action(const std::vector<std::string>& args)
{
keychord_init();
return 0;
}
static int console_init_action(const std::vector<std::string>& args)
{
std::string console = property_get("ro.boot.console");
if (!console.empty()) {
default_console = "/dev/" + console;
}
return 0;
}
static void import_kernel_nv(const std::string& key, const std::string& value, bool for_emulator) {
if (key.empty()) return;
if (for_emulator) {
// In the emulator, export any kernel option with the "ro.kernel." prefix.
property_set(StringPrintf("ro.kernel.%s", key.c_str()).c_str(), value.c_str());
return;
}
if (key == "qemu") {
strlcpy(qemu, value.c_str(), sizeof(qemu));
} else if (android::base::StartsWith(key, "androidboot.")) {
property_set(StringPrintf("ro.boot.%s", key.c_str() + 12).c_str(), value.c_str());
}
}
static void export_oem_lock_status() {
if (property_get("ro.oem_unlock_supported") != "1") {
return;
}
std::string value = property_get("ro.boot.verifiedbootstate");
if (!value.empty()) {
property_set("ro.boot.flash.locked", value == "orange" ? "0" : "1");
}
}
static void export_kernel_boot_props() {
struct {
const char *src_prop;
const char *dst_prop;
const char *default_value;
} prop_map[] = {
{ "ro.boot.serialno", "ro.serialno", "", },
{ "ro.boot.mode", "ro.bootmode", "unknown", },
{ "ro.boot.baseband", "ro.baseband", "unknown", },
{ "ro.boot.bootloader", "ro.bootloader", "unknown", },
{ "ro.boot.hardware", "ro.hardware", "unknown", },
{ "ro.boot.revision", "ro.revision", "0", },
};
for (size_t i = 0; i < arraysize(prop_map); i++) {
std::string value = property_get(prop_map[i].src_prop);
property_set(prop_map[i].dst_prop, (!value.empty()) ? value.c_str() : prop_map[i].default_value);
}
}
static void process_kernel_dt() {
static const char android_dir[] = "/proc/device-tree/firmware/android";
std::string file_name = StringPrintf("%s/compatible", android_dir);
std::string dt_file;
android::base::ReadFileToString(file_name, &dt_file);
if (!dt_file.compare("android,firmware")) {
LOG(ERROR) << "firmware/android is not compatible with 'android,firmware'";
return;
}
std::unique_ptr<DIR, int(*)(DIR*)>dir(opendir(android_dir), closedir);
if (!dir) return;
struct dirent *dp;
while ((dp = readdir(dir.get())) != NULL) {
if (dp->d_type != DT_REG || !strcmp(dp->d_name, "compatible") || !strcmp(dp->d_name, "name")) {
continue;
}
file_name = StringPrintf("%s/%s", android_dir, dp->d_name);
android::base::ReadFileToString(file_name, &dt_file);
std::replace(dt_file.begin(), dt_file.end(), ',', '.');
std::string property_name = StringPrintf("ro.boot.%s", dp->d_name);
property_set(property_name.c_str(), dt_file.c_str());
}
}
static void process_kernel_cmdline() {
// The first pass does the common stuff, and finds if we are in qemu.
// The second pass is only necessary for qemu to export all kernel params
// as properties.
import_kernel_cmdline(false, import_kernel_nv);
if (qemu[0]) import_kernel_cmdline(true, import_kernel_nv);
}
static int queue_property_triggers_action(const std::vector<std::string>& args)
{
ActionManager::GetInstance().QueueAllPropertyTriggers();
/* enable property triggers */
property_triggers_enabled = 1;
return 0;
}
static void selinux_init_all_handles(void)
{
sehandle = selinux_android_file_context_handle();
selinux_android_set_sehandle(sehandle);
sehandle_prop = selinux_android_prop_context_handle();
}
enum selinux_enforcing_status { SELINUX_PERMISSIVE, SELINUX_ENFORCING };
static selinux_enforcing_status selinux_status_from_cmdline() {
selinux_enforcing_status status = SELINUX_ENFORCING;
import_kernel_cmdline(false, [&](const std::string& key, const std::string& value, bool in_qemu) {
if (key == "androidboot.selinux" && value == "permissive") {
status = SELINUX_PERMISSIVE;
}
});
return status;
}
static bool selinux_is_enforcing(void)
{
if (ALLOW_PERMISSIVE_SELINUX) {
return selinux_status_from_cmdline() == SELINUX_ENFORCING;
}
return true;
}
static int audit_callback(void *data, security_class_t /*cls*/, char *buf, size_t len) {
property_audit_data *d = reinterpret_cast<property_audit_data*>(data);
if (!d || !d->name || !d->cr) {
LOG(ERROR) << "audit_callback invoked with null data arguments!";
return 0;
}
snprintf(buf, len, "property=%s pid=%d uid=%d gid=%d", d->name,
d->cr->pid, d->cr->uid, d->cr->gid);
return 0;
}
static void security_failure() {
LOG(ERROR) << "Security failure; rebooting into recovery mode...";
android_reboot(ANDROID_RB_RESTART2, 0, "recovery");
while (true) { pause(); } // never reached
}
static void selinux_initialize(bool in_kernel_domain) {
Timer t;
selinux_callback cb;
cb.func_log = selinux_klog_callback;
selinux_set_callback(SELINUX_CB_LOG, cb);
cb.func_audit = audit_callback;
selinux_set_callback(SELINUX_CB_AUDIT, cb);
if (in_kernel_domain) {
LOG(INFO) << "Loading SELinux policy...";
if (selinux_android_load_policy() < 0) {
PLOG(ERROR) << "failed to load policy";
security_failure();
}
bool kernel_enforcing = (security_getenforce() == 1);
bool is_enforcing = selinux_is_enforcing();
if (kernel_enforcing != is_enforcing) {
if (security_setenforce(is_enforcing)) {
PLOG(ERROR) << "security_setenforce(%s) failed" << (is_enforcing ? "true" : "false");
security_failure();
}
}
if (write_file("/sys/fs/selinux/checkreqprot", "0") == -1) {
security_failure();
}
LOG(INFO) << "(Initializing SELinux " << (is_enforcing ? "enforcing" : "non-enforcing")
<< " took " << t.duration() << "s.)";
} else {
selinux_init_all_handles();
}
}
// Set the UDC controller for the ConfigFS USB Gadgets.
// Read the UDC controller in use from "/sys/class/udc".
// In case of multiple UDC controllers select the first one.
static void set_usb_controller() {
std::unique_ptr<DIR, decltype(&closedir)>dir(opendir("/sys/class/udc"), closedir);
if (!dir) return;
dirent* dp;
while ((dp = readdir(dir.get())) != nullptr) {
if (dp->d_name[0] == '.') continue;
property_set("sys.usb.controller", dp->d_name);
break;
}
}
/* Returns a new path consisting of base_path and the file name in reference_path. */
static std::string get_path(const std::string& base_path, const std::string& reference_path) {
std::string::size_type pos = reference_path.rfind('/');
if (pos == std::string::npos) {
return base_path + '/' + reference_path;
} else {
return base_path + reference_path.substr(pos);
}
}
/* Imports the fstab info from cmdline. */
static std::string import_cmdline_fstab() {
std::string prefix, fstab, fstab_full;
import_kernel_cmdline(false,
[&](const std::string& key, const std::string& value, bool in_qemu __attribute__((__unused__))) {
if (key == "android.early.prefix") {
prefix = value;
} else if (key == "android.early.fstab") {
fstab = value;
}
});
if (!fstab.empty()) {
// Convert "mmcblk0p09+/odm+ext4+ro+verify" to "mmcblk0p09 /odm ext4 ro verify"
std::replace(fstab.begin(), fstab.end(), '+', ' ');
for (const auto& entry : android::base::Split(fstab, "\n")) {
fstab_full += prefix + entry + '\n';
}
}
return fstab_full;
}
/* Early mount vendor and ODM partitions. The fstab info is read from kernel cmdline. */
static void early_mount() {
std::string fstab_string = import_cmdline_fstab();
if (fstab_string.empty()) {
LOG(INFO) << "Failed to load vendor fstab from kernel cmdline";
return;
}
FILE *fstab_file = fmemopen((void *)fstab_string.c_str(), fstab_string.length(), "r");
if (!fstab_file) {
PLOG(ERROR) << "Failed to open fstab string as FILE";
return;
}
std::unique_ptr<struct fstab, decltype(&fs_mgr_free_fstab)> fstab(fs_mgr_read_fstab_file(fstab_file), fs_mgr_free_fstab);
fclose(fstab_file);
if (!fstab) {
LOG(ERROR) << "Failed to parse fstab string: " << fstab_string;
return;
}
LOG(INFO) << "Loaded vendor fstab from cmdline";
if (early_device_socket_open()) {
LOG(ERROR) << "Failed to open device uevent socket";
return;
}
/* Create /dev/device-mapper for dm-verity */
early_create_dev("/sys/devices/virtual/misc/device-mapper", EARLY_CHAR_DEV);
for (int i = 0; i < fstab->num_entries; ++i) {
struct fstab_rec *rec = &fstab->recs[i];
std::string mount_point = rec->mount_point;
std::string syspath = rec->blk_device;
if (mount_point != "/vendor" && mount_point != "/odm")
continue;
/* Create mount target under /dev/block/ from sysfs via uevent */
LOG(INFO) << "Mounting " << mount_point << " from " << syspath << "...";
char *devpath = strdup(get_path("/dev/block", syspath).c_str());
if (!devpath) {
PLOG(ERROR) << "Failed to strdup dev path in early mount " << syspath;
continue;
}
rec->blk_device = devpath;
early_create_dev(syspath, EARLY_BLOCK_DEV);
int rc = fs_mgr_early_setup_verity(rec);
if (rc == FS_MGR_EARLY_SETUP_VERITY_SUCCESS) {
/* Mount target is changed to /dev/block/dm-<n>; initiate its creation from sysfs counterpart */
early_create_dev(get_path("/sys/devices/virtual/block", rec->blk_device), EARLY_BLOCK_DEV);
} else if (rc == FS_MGR_EARLY_SETUP_VERITY_FAIL) {
LOG(ERROR) << "Failed to set up dm-verity on " << rec->blk_device;
continue;
} else { /* FS_MGR_EARLY_SETUP_VERITY_NO_VERITY */
LOG(INFO) << "dm-verity disabled on debuggable device; mount directly on " << rec->blk_device;
}
mkdir(mount_point.c_str(), 0755);
rc = mount(rec->blk_device, mount_point.c_str(), rec->fs_type, rec->flags, rec->fs_options);
if (rc) {
PLOG(ERROR) << "Failed to mount on " << rec->blk_device;
}
}
early_device_socket_close();
}
int main(int argc, char** argv) {
if (!strcmp(basename(argv[0]), "ueventd")) {
return ueventd_main(argc, argv);
}
if (!strcmp(basename(argv[0]), "watchdogd")) {
return watchdogd_main(argc, argv);
}
boot_clock::time_point start_time = boot_clock::now();
// Clear the umask.
umask(0);
add_environment("PATH", _PATH_DEFPATH);
bool is_first_stage = (getenv("INIT_SECOND_STAGE") == nullptr);
// Don't expose the raw commandline to unprivileged processes.
chmod("/proc/cmdline", 0440);
// Get the basic filesystem setup we need put together in the initramdisk
// on / and then we'll let the rc file figure out the rest.
if (is_first_stage) {
mount("tmpfs", "/dev", "tmpfs", MS_NOSUID, "mode=0755");
mkdir("/dev/pts", 0755);
mkdir("/dev/socket", 0755);
mount("devpts", "/dev/pts", "devpts", 0, NULL);
#define MAKE_STR(x) __STRING(x)
mount("proc", "/proc", "proc", 0, "hidepid=2,gid=" MAKE_STR(AID_READPROC));
gid_t groups[] = { AID_READPROC };
setgroups(arraysize(groups), groups);
mount("sysfs", "/sys", "sysfs", 0, NULL);
mount("selinuxfs", "/sys/fs/selinux", "selinuxfs", 0, NULL);
mknod("/dev/kmsg", S_IFCHR | 0600, makedev(1, 11));
mknod("/dev/random", S_IFCHR | 0666, makedev(1, 8));
mknod("/dev/urandom", S_IFCHR | 0666, makedev(1, 9));
}
// Now that tmpfs is mounted on /dev and we have /dev/kmsg, we can actually
// talk to the outside world...
InitKernelLogging(argv);
LOG(INFO) << "init " << (is_first_stage ? "first" : "second") << " stage started!";
if (is_first_stage) {
// Mount devices defined in android.early.* kernel commandline
early_mount();
// Set up SELinux, loading the SELinux policy.
selinux_initialize(true);
// We're in the kernel domain, so re-exec init to transition to the init domain now
// that the SELinux policy has been loaded.
if (restorecon("/init") == -1) {
PLOG(ERROR) << "restorecon failed";
security_failure();
}
setenv("INIT_SECOND_STAGE", "true", 1);
uint64_t start_ns = start_time.time_since_epoch().count();
setenv("INIT_STARTED_AT", StringPrintf("%" PRIu64, start_ns).c_str(), 1);
char* path = argv[0];
char* args[] = { path, nullptr };
if (execv(path, args) == -1) {
PLOG(ERROR) << "execv(\"" << path << "\") failed";
security_failure();
}
} else {
// Indicate that booting is in progress to background fw loaders, etc.
close(open("/dev/.booting", O_WRONLY | O_CREAT | O_CLOEXEC, 0000));
property_init();
// If arguments are passed both on the command line and in DT,
// properties set in DT always have priority over the command-line ones.
process_kernel_dt();
process_kernel_cmdline();
// Propagate the kernel variables to internal variables
// used by init as well as the current required properties.
export_kernel_boot_props();
// Make the time that init started available for bootstat to log.
property_set("init.start", getenv("INIT_STARTED_AT"));
// Now set up SELinux for second stage.
selinux_initialize(false);
}
// These directories were necessarily created before initial policy load
// and therefore need their security context restored to the proper value.
// This must happen before /dev is populated by ueventd.
LOG(INFO) << "Running restorecon...";
restorecon("/dev");
restorecon("/dev/kmsg");
restorecon("/dev/socket");
restorecon("/dev/random");
restorecon("/dev/urandom");
restorecon("/dev/__properties__");
restorecon("/property_contexts");
restorecon("/sys", SELINUX_ANDROID_RESTORECON_RECURSE);
restorecon("/dev/block", SELINUX_ANDROID_RESTORECON_RECURSE);
restorecon("/dev/device-mapper");
epoll_fd = epoll_create1(EPOLL_CLOEXEC);
if (epoll_fd == -1) {
PLOG(ERROR) << "epoll_create1 failed";
exit(1);
}
signal_handler_init();
property_load_boot_defaults();
export_oem_lock_status();
start_property_service();
set_usb_controller();
const BuiltinFunctionMap function_map;
Action::set_function_map(&function_map);
Parser& parser = Parser::GetInstance();
parser.AddSectionParser("service",std::make_unique<ServiceParser>());
parser.AddSectionParser("on", std::make_unique<ActionParser>());
parser.AddSectionParser("import", std::make_unique<ImportParser>());
parser.ParseConfig("/init.rc");
ActionManager& am = ActionManager::GetInstance();
am.QueueEventTrigger("early-init");
// Queue an action that waits for coldboot done so we know ueventd has set up all of /dev...
am.QueueBuiltinAction(wait_for_coldboot_done_action, "wait_for_coldboot_done");
// ... so that we can start queuing up actions that require stuff from /dev.
am.QueueBuiltinAction(mix_hwrng_into_linux_rng_action, "mix_hwrng_into_linux_rng");
am.QueueBuiltinAction(keychord_init_action, "keychord_init");
am.QueueBuiltinAction(console_init_action, "console_init");
// Trigger all the boot actions to get us started.
am.QueueEventTrigger("init");
// Repeat mix_hwrng_into_linux_rng in case /dev/hw_random or /dev/random
// wasn't ready immediately after wait_for_coldboot_done
am.QueueBuiltinAction(mix_hwrng_into_linux_rng_action, "mix_hwrng_into_linux_rng");
// Don't mount filesystems or start core system services in charger mode.
std::string bootmode = property_get("ro.bootmode");
if (bootmode == "charger") {
am.QueueEventTrigger("charger");
} else {
am.QueueEventTrigger("late-init");
}
// Run all property triggers based on current state of the properties.
am.QueueBuiltinAction(queue_property_triggers_action, "queue_property_triggers");
while (true) {
if (!waiting_for_exec) {
am.ExecuteOneCommand();
restart_processes();
}
// By default, sleep until something happens.
int epoll_timeout_ms = -1;
// If there's more work to do, wake up again immediately.
if (am.HasMoreCommands()) epoll_timeout_ms = 0;
// If there's a process that needs restarting, wake up in time for that.
if (process_needs_restart_at != 0) {
epoll_timeout_ms = (process_needs_restart_at - time(nullptr)) * 1000;
if (epoll_timeout_ms < 0) epoll_timeout_ms = 0;
}
bootchart_sample(&epoll_timeout_ms);
epoll_event ev;
int nr = TEMP_FAILURE_RETRY(epoll_wait(epoll_fd, &ev, 1, epoll_timeout_ms));
if (nr == -1) {
PLOG(ERROR) << "epoll_wait failed";
} else if (nr == 1) {
((void (*)()) ev.data.ptr)();
}
}
return 0;
}
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