749 lines
23 KiB
C++
749 lines
23 KiB
C++
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <ctype.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <fstream>
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#include <libgen.h>
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#include <paths.h>
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#include <signal.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/epoll.h>
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#include <sys/mount.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/un.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <mtd/mtd-user.h>
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#include <selinux/selinux.h>
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#include <selinux/label.h>
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#include <selinux/android.h>
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#include <android-base/file.h>
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#include <android-base/stringprintf.h>
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#include <android-base/strings.h>
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#include <cutils/android_reboot.h>
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#include <cutils/fs.h>
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#include <cutils/iosched_policy.h>
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#include <cutils/list.h>
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#include <cutils/sockets.h>
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#include <private/android_filesystem_config.h>
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#include <memory>
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#include "action.h"
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#include "bootchart.h"
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#include "devices.h"
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#include "import_parser.h"
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#include "init.h"
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#include "init_parser.h"
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#include "keychords.h"
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#include "log.h"
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#include "property_service.h"
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#include "service.h"
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#include "signal_handler.h"
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#include "ueventd.h"
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#include "util.h"
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#include "watchdogd.h"
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struct selabel_handle *sehandle;
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struct selabel_handle *sehandle_prop;
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static int property_triggers_enabled = 0;
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static char qemu[32];
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int have_console;
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std::string console_name = "/dev/console";
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static time_t process_needs_restart;
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const char *ENV[32];
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bool waiting_for_exec = false;
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static int epoll_fd = -1;
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void register_epoll_handler(int fd, void (*fn)()) {
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epoll_event ev;
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ev.events = EPOLLIN;
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ev.data.ptr = reinterpret_cast<void*>(fn);
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if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fd, &ev) == -1) {
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ERROR("epoll_ctl failed: %s\n", strerror(errno));
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}
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}
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/* add_environment - add "key=value" to the current environment */
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int add_environment(const char *key, const char *val)
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{
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size_t n;
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size_t key_len = strlen(key);
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/* The last environment entry is reserved to terminate the list */
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for (n = 0; n < (ARRAY_SIZE(ENV) - 1); n++) {
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/* Delete any existing entry for this key */
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if (ENV[n] != NULL) {
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size_t entry_key_len = strcspn(ENV[n], "=");
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if ((entry_key_len == key_len) && (strncmp(ENV[n], key, entry_key_len) == 0)) {
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free((char*)ENV[n]);
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ENV[n] = NULL;
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}
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}
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/* Add entry if a free slot is available */
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if (ENV[n] == NULL) {
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char* entry;
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asprintf(&entry, "%s=%s", key, val);
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ENV[n] = entry;
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return 0;
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}
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}
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ERROR("No env. room to store: '%s':'%s'\n", key, val);
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return -1;
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}
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void property_changed(const char *name, const char *value)
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{
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if (property_triggers_enabled)
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ActionManager::GetInstance().QueuePropertyTrigger(name, value);
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}
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static void restart_processes()
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{
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process_needs_restart = 0;
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ServiceManager::GetInstance().
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ForEachServiceWithFlags(SVC_RESTARTING, [] (Service* s) {
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s->RestartIfNeeded(process_needs_restart);
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});
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}
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void handle_control_message(const std::string& msg, const std::string& name) {
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Service* svc = ServiceManager::GetInstance().FindServiceByName(name);
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if (svc == nullptr) {
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ERROR("no such service '%s'\n", name.c_str());
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return;
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}
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if (msg == "start") {
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svc->Start();
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} else if (msg == "stop") {
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svc->Stop();
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} else if (msg == "restart") {
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svc->Restart();
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} else {
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ERROR("unknown control msg '%s'\n", msg.c_str());
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}
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}
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static int wait_for_coldboot_done_action(const std::vector<std::string>& args) {
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Timer t;
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NOTICE("Waiting for %s...\n", COLDBOOT_DONE);
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// Any longer than 1s is an unreasonable length of time to delay booting.
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// If you're hitting this timeout, check that you didn't make your
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// sepolicy regular expressions too expensive (http://b/19899875).
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if (wait_for_file(COLDBOOT_DONE, 1)) {
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ERROR("Timed out waiting for %s\n", COLDBOOT_DONE);
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}
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NOTICE("Waiting for %s took %.2fs.\n", COLDBOOT_DONE, t.duration());
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return 0;
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}
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/*
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* Writes 512 bytes of output from Hardware RNG (/dev/hw_random, backed
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* by Linux kernel's hw_random framework) into Linux RNG's via /dev/urandom.
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* Does nothing if Hardware RNG is not present.
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*
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* Since we don't yet trust the quality of Hardware RNG, these bytes are not
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* mixed into the primary pool of Linux RNG and the entropy estimate is left
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* unmodified.
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*
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* If the HW RNG device /dev/hw_random is present, we require that at least
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* 512 bytes read from it are written into Linux RNG. QA is expected to catch
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* devices/configurations where these I/O operations are blocking for a long
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* time. We do not reboot or halt on failures, as this is a best-effort
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* attempt.
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*/
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static int mix_hwrng_into_linux_rng_action(const std::vector<std::string>& args)
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{
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int result = -1;
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int hwrandom_fd = -1;
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int urandom_fd = -1;
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char buf[512];
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ssize_t chunk_size;
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size_t total_bytes_written = 0;
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hwrandom_fd = TEMP_FAILURE_RETRY(
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open("/dev/hw_random", O_RDONLY | O_NOFOLLOW | O_CLOEXEC));
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if (hwrandom_fd == -1) {
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if (errno == ENOENT) {
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ERROR("/dev/hw_random not found\n");
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/* It's not an error to not have a Hardware RNG. */
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result = 0;
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} else {
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ERROR("Failed to open /dev/hw_random: %s\n", strerror(errno));
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}
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goto ret;
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}
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urandom_fd = TEMP_FAILURE_RETRY(
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open("/dev/urandom", O_WRONLY | O_NOFOLLOW | O_CLOEXEC));
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if (urandom_fd == -1) {
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ERROR("Failed to open /dev/urandom: %s\n", strerror(errno));
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goto ret;
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}
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while (total_bytes_written < sizeof(buf)) {
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chunk_size = TEMP_FAILURE_RETRY(
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read(hwrandom_fd, buf, sizeof(buf) - total_bytes_written));
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if (chunk_size == -1) {
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ERROR("Failed to read from /dev/hw_random: %s\n", strerror(errno));
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goto ret;
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} else if (chunk_size == 0) {
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ERROR("Failed to read from /dev/hw_random: EOF\n");
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goto ret;
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}
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chunk_size = TEMP_FAILURE_RETRY(write(urandom_fd, buf, chunk_size));
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if (chunk_size == -1) {
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ERROR("Failed to write to /dev/urandom: %s\n", strerror(errno));
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goto ret;
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}
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total_bytes_written += chunk_size;
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}
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INFO("Mixed %zu bytes from /dev/hw_random into /dev/urandom",
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total_bytes_written);
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result = 0;
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ret:
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if (hwrandom_fd != -1) {
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close(hwrandom_fd);
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}
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if (urandom_fd != -1) {
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close(urandom_fd);
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}
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return result;
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}
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static void security_failure() {
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ERROR("Security failure; rebooting into recovery mode...\n");
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android_reboot(ANDROID_RB_RESTART2, 0, "recovery");
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while (true) { pause(); } // never reached
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}
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#define MMAP_RND_PATH "/proc/sys/vm/mmap_rnd_bits"
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#define MMAP_RND_COMPAT_PATH "/proc/sys/vm/mmap_rnd_compat_bits"
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/* __attribute__((unused)) due to lack of mips support: see mips block
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* in set_mmap_rnd_bits_action */
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static bool __attribute__((unused)) set_mmap_rnd_bits_min(int start, int min, bool compat) {
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std::string path;
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if (compat) {
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path = MMAP_RND_COMPAT_PATH;
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} else {
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path = MMAP_RND_PATH;
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}
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std::ifstream inf(path, std::fstream::in);
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if (!inf) {
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return false;
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}
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while (start >= min) {
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// try to write out new value
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std::string str_val = std::to_string(start);
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std::ofstream of(path, std::fstream::out);
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if (!of) {
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return false;
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}
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of << str_val << std::endl;
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of.close();
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// check to make sure it was recorded
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inf.seekg(0);
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std::string str_rec;
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inf >> str_rec;
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if (str_val.compare(str_rec) == 0) {
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break;
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}
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start--;
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}
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inf.close();
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return (start >= min);
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}
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/*
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* Set /proc/sys/vm/mmap_rnd_bits and potentially
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* /proc/sys/vm/mmap_rnd_compat_bits to the maximum supported values.
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* Returns -1 if unable to set these to an acceptable value. Apply
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* upstream patch-sets https://lkml.org/lkml/2015/12/21/337 and
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* https://lkml.org/lkml/2016/2/4/831 to enable this.
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*/
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static int set_mmap_rnd_bits_action(const std::vector<std::string>& args)
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{
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int ret = -1;
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/* values are arch-dependent */
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#if defined(__aarch64__)
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/* arm64 supports 18 - 33 bits depending on pagesize and VA_SIZE */
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if (set_mmap_rnd_bits_min(33, 24, false)
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&& set_mmap_rnd_bits_min(16, 16, true)) {
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ret = 0;
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}
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#elif defined(__x86_64__)
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/* x86_64 supports 28 - 32 bits */
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if (set_mmap_rnd_bits_min(32, 32, false)
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&& set_mmap_rnd_bits_min(16, 16, true)) {
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ret = 0;
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}
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#elif defined(__arm__) || defined(__i386__)
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/* check to see if we're running on 64-bit kernel */
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bool h64 = !access(MMAP_RND_COMPAT_PATH, F_OK);
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/* supported 32-bit architecture must have 16 bits set */
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if (set_mmap_rnd_bits_min(16, 16, h64)) {
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ret = 0;
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}
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#elif defined(__mips__) || defined(__mips64__)
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// TODO: add mips support b/27788820
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ret = 0;
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#else
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ERROR("Unknown architecture\n");
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#endif
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#ifdef __BRILLO__
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// TODO: b/27794137
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ret = 0;
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#endif
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if (ret == -1) {
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ERROR("Unable to set adequate mmap entropy value!\n");
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security_failure();
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}
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return ret;
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}
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static int keychord_init_action(const std::vector<std::string>& args)
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{
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keychord_init();
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return 0;
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}
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static int console_init_action(const std::vector<std::string>& args)
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{
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std::string console = property_get("ro.boot.console");
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if (!console.empty()) {
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console_name = "/dev/" + console;
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}
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int fd = open(console_name.c_str(), O_RDWR | O_CLOEXEC);
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if (fd >= 0)
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have_console = 1;
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close(fd);
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fd = open("/dev/tty0", O_WRONLY | O_CLOEXEC);
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if (fd >= 0) {
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const char *msg;
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msg = "\n"
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"\n"
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"\n"
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"\n"
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"\n"
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"\n"
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"\n" // console is 40 cols x 30 lines
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"\n"
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"\n"
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"\n"
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"\n"
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"\n"
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"\n"
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"\n"
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" A N D R O I D ";
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write(fd, msg, strlen(msg));
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close(fd);
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}
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return 0;
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}
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static void import_kernel_nv(const std::string& key, const std::string& value, bool for_emulator) {
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if (key.empty()) return;
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if (for_emulator) {
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// In the emulator, export any kernel option with the "ro.kernel." prefix.
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property_set(android::base::StringPrintf("ro.kernel.%s", key.c_str()).c_str(), value.c_str());
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return;
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}
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if (key == "qemu") {
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strlcpy(qemu, value.c_str(), sizeof(qemu));
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} else if (android::base::StartsWith(key, "androidboot.")) {
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property_set(android::base::StringPrintf("ro.boot.%s", key.c_str() + 12).c_str(),
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value.c_str());
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}
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}
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static void export_oem_lock_status() {
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if (property_get("ro.oem_unlock_supported") != "1") {
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return;
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}
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std::string value = property_get("ro.boot.verifiedbootstate");
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if (!value.empty()) {
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property_set("ro.boot.flash.locked", value == "orange" ? "0" : "1");
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}
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}
|
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|
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static void export_kernel_boot_props() {
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struct {
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const char *src_prop;
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const char *dst_prop;
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const char *default_value;
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} prop_map[] = {
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{ "ro.boot.serialno", "ro.serialno", "", },
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{ "ro.boot.mode", "ro.bootmode", "unknown", },
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{ "ro.boot.baseband", "ro.baseband", "unknown", },
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{ "ro.boot.bootloader", "ro.bootloader", "unknown", },
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{ "ro.boot.hardware", "ro.hardware", "unknown", },
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{ "ro.boot.revision", "ro.revision", "0", },
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};
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for (size_t i = 0; i < ARRAY_SIZE(prop_map); i++) {
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std::string value = property_get(prop_map[i].src_prop);
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property_set(prop_map[i].dst_prop, (!value.empty()) ? value.c_str() : prop_map[i].default_value);
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}
|
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}
|
|
|
|
static void process_kernel_dt() {
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static const char android_dir[] = "/proc/device-tree/firmware/android";
|
|
|
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std::string file_name = android::base::StringPrintf("%s/compatible", android_dir);
|
|
|
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std::string dt_file;
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android::base::ReadFileToString(file_name, &dt_file);
|
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if (!dt_file.compare("android,firmware")) {
|
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ERROR("firmware/android is not compatible with 'android,firmware'\n");
|
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return;
|
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}
|
|
|
|
std::unique_ptr<DIR, int(*)(DIR*)>dir(opendir(android_dir), closedir);
|
|
if (!dir) return;
|
|
|
|
struct dirent *dp;
|
|
while ((dp = readdir(dir.get())) != NULL) {
|
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if (dp->d_type != DT_REG || !strcmp(dp->d_name, "compatible") || !strcmp(dp->d_name, "name")) {
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continue;
|
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}
|
|
|
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file_name = android::base::StringPrintf("%s/%s", android_dir, dp->d_name);
|
|
|
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android::base::ReadFileToString(file_name, &dt_file);
|
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std::replace(dt_file.begin(), dt_file.end(), ',', '.');
|
|
|
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std::string property_name = android::base::StringPrintf("ro.boot.%s", dp->d_name);
|
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property_set(property_name.c_str(), dt_file.c_str());
|
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}
|
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}
|
|
|
|
static void process_kernel_cmdline() {
|
|
// Don't expose the raw commandline to unprivileged processes.
|
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chmod("/proc/cmdline", 0440);
|
|
|
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// 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
|
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// as properties.
|
|
import_kernel_cmdline(false, import_kernel_nv);
|
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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;
|
|
}
|
|
|
|
int selinux_reload_policy(void)
|
|
{
|
|
INFO("SELinux: Attempting to reload policy files\n");
|
|
|
|
if (selinux_android_reload_policy() == -1) {
|
|
return -1;
|
|
}
|
|
|
|
if (sehandle)
|
|
selabel_close(sehandle);
|
|
|
|
if (sehandle_prop)
|
|
selabel_close(sehandle_prop);
|
|
|
|
selinux_init_all_handles();
|
|
return 0;
|
|
}
|
|
|
|
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) {
|
|
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 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) {
|
|
INFO("Loading SELinux policy...\n");
|
|
if (selinux_android_load_policy() < 0) {
|
|
ERROR("failed to load policy: %s\n", strerror(errno));
|
|
security_failure();
|
|
}
|
|
|
|
bool kernel_enforcing = (security_getenforce() == 1);
|
|
bool is_enforcing = selinux_is_enforcing();
|
|
if (kernel_enforcing != is_enforcing) {
|
|
if (security_setenforce(is_enforcing)) {
|
|
ERROR("security_setenforce(%s) failed: %s\n",
|
|
is_enforcing ? "true" : "false", strerror(errno));
|
|
security_failure();
|
|
}
|
|
}
|
|
|
|
if (write_file("/sys/fs/selinux/checkreqprot", "0") == -1) {
|
|
security_failure();
|
|
}
|
|
|
|
NOTICE("(Initializing SELinux %s took %.2fs.)\n",
|
|
is_enforcing ? "enforcing" : "non-enforcing", t.duration());
|
|
} else {
|
|
selinux_init_all_handles();
|
|
}
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
// Clear the umask.
|
|
umask(0);
|
|
|
|
add_environment("PATH", _PATH_DEFPATH);
|
|
|
|
bool is_first_stage = (argc == 1) || (strcmp(argv[1], "--second-stage") != 0);
|
|
|
|
// 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));
|
|
mount("sysfs", "/sys", "sysfs", 0, NULL);
|
|
}
|
|
|
|
// We must have some place other than / to create the device nodes for
|
|
// kmsg and null, otherwise we won't be able to remount / read-only
|
|
// later on. Now that tmpfs is mounted on /dev, we can actually talk
|
|
// to the outside world.
|
|
open_devnull_stdio();
|
|
klog_init();
|
|
klog_set_level(KLOG_NOTICE_LEVEL);
|
|
|
|
NOTICE("init %s started!\n", is_first_stage ? "first stage" : "second stage");
|
|
|
|
if (!is_first_stage) {
|
|
// 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();
|
|
}
|
|
|
|
// Set up SELinux, including loading the SELinux policy if we're in the kernel domain.
|
|
selinux_initialize(is_first_stage);
|
|
|
|
// If we're in the kernel domain, re-exec init to transition to the init domain now
|
|
// that the SELinux policy has been loaded.
|
|
if (is_first_stage) {
|
|
if (restorecon("/init") == -1) {
|
|
ERROR("restorecon failed: %s\n", strerror(errno));
|
|
security_failure();
|
|
}
|
|
char* path = argv[0];
|
|
char* args[] = { path, const_cast<char*>("--second-stage"), nullptr };
|
|
if (execv(path, args) == -1) {
|
|
ERROR("execv(\"%s\") failed: %s\n", path, strerror(errno));
|
|
security_failure();
|
|
}
|
|
}
|
|
|
|
// 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.
|
|
NOTICE("Running restorecon...\n");
|
|
restorecon("/dev");
|
|
restorecon("/dev/socket");
|
|
restorecon("/dev/__properties__");
|
|
restorecon("/property_contexts");
|
|
restorecon_recursive("/sys");
|
|
|
|
epoll_fd = epoll_create1(EPOLL_CLOEXEC);
|
|
if (epoll_fd == -1) {
|
|
ERROR("epoll_create1 failed: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
signal_handler_init();
|
|
|
|
property_load_boot_defaults();
|
|
export_oem_lock_status();
|
|
start_property_service();
|
|
|
|
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(set_mmap_rnd_bits_action, "set_mmap_rnd_bits");
|
|
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();
|
|
}
|
|
|
|
int timeout = -1;
|
|
if (process_needs_restart) {
|
|
timeout = (process_needs_restart - gettime()) * 1000;
|
|
if (timeout < 0)
|
|
timeout = 0;
|
|
}
|
|
|
|
if (am.HasMoreCommands()) {
|
|
timeout = 0;
|
|
}
|
|
|
|
bootchart_sample(&timeout);
|
|
|
|
epoll_event ev;
|
|
int nr = TEMP_FAILURE_RETRY(epoll_wait(epoll_fd, &ev, 1, timeout));
|
|
if (nr == -1) {
|
|
ERROR("epoll_wait failed: %s\n", strerror(errno));
|
|
} else if (nr == 1) {
|
|
((void (*)()) ev.data.ptr)();
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|