5 #include <sys/socket.h>
11 #include "dinit-log.h"
12 #include "dinit-socket.h"
13 #include "proc-service.h"
15 #include "baseproc-sys.h"
18 * Base process implementation (base_process_service).
20 * See proc-service.h for interface documentation.
23 void base_process_service::do_smooth_recovery() noexcept
25 if (! restart_ps_process()) {
27 services->process_queues();
31 bool base_process_service::bring_up() noexcept
35 return restart_ps_process();
40 if (! open_socket()) {
44 event_loop.get_time(restart_interval_time, clock_type::MONOTONIC);
45 restart_interval_count = 0;
46 if (start_ps_process(exec_arg_parts, onstart_flags.starts_on_console)) {
47 // Note: we don't set a start timeout for PROCESS services.
48 if (start_timeout != time_val(0,0) && get_type() != service_type_t::PROCESS) {
49 restart_timer.arm_timer_rel(event_loop, start_timeout);
50 stop_timer_armed = true;
52 else if (stop_timer_armed) {
53 restart_timer.stop_timer(event_loop);
54 stop_timer_armed = false;
62 bool base_process_service::start_ps_process(const std::vector<const char *> &cmd, bool on_console) noexcept
64 // In general, you can't tell whether fork/exec is successful. We use a pipe to communicate
65 // success/failure from the child to the parent. The pipe is set CLOEXEC so a successful
66 // exec closes the pipe, and the parent sees EOF. If the exec is unsuccessful, the errno
67 // is written to the pipe, and the parent can read it.
69 event_loop.get_time(last_start_time, clock_type::MONOTONIC);
72 if (bp_sys::pipe2(pipefd, O_CLOEXEC)) {
73 log(loglevel_t::ERROR, get_name(), ": can't create status check pipe: ", strerror(errno));
77 const char * logfile = this->logfile.c_str();
79 logfile = "/dev/null";
82 bool child_status_registered = false;
83 control_conn_t *control_conn = nullptr;
85 int control_socket[2] = {-1, -1};
86 if (onstart_flags.pass_cs_fd) {
87 if (dinit_socketpair(AF_UNIX, SOCK_STREAM, /* protocol */ 0, control_socket, SOCK_NONBLOCK)) {
88 log(loglevel_t::ERROR, get_name(), ": can't create control socket: ", strerror(errno));
92 // Make the server side socket close-on-exec:
93 int fdflags = bp_sys::fcntl(control_socket[0], F_GETFD);
94 bp_sys::fcntl(control_socket[0], F_SETFD, fdflags | FD_CLOEXEC);
97 control_conn = new control_conn_t(event_loop, services, control_socket[0]);
99 catch (std::exception &exc) {
100 log(loglevel_t::ERROR, get_name(), ": can't launch process; out of memory");
105 // Set up complete, now fork and exec:
110 child_status_listener.add_watch(event_loop, pipefd[0], dasynq::IN_EVENTS);
111 child_status_registered = true;
113 // We specify a high priority (i.e. low priority value) so that process termination is
114 // handled early. This means we have always recorded that the process is terminated by the
115 // time that we handle events that might otherwise cause us to signal the process, so we
116 // avoid sending a signal to an invalid (and possibly recycled) process ID.
117 forkpid = child_listener.fork(event_loop, reserved_child_watch, dasynq::DEFAULT_PRIORITY - 10);
118 reserved_child_watch = true;
120 catch (std::exception &e) {
121 log(loglevel_t::ERROR, get_name(), ": Could not fork: ", e.what());
126 run_child_proc(cmd.data(), logfile, on_console, pipefd[1], control_socket[1], socket_fd,
127 run_as_uid, run_as_gid);
131 bp_sys::close(pipefd[1]); // close the 'other end' fd
132 if (control_socket[1] != -1) {
133 bp_sys::close(control_socket[1]);
137 waiting_for_execstat = true;
144 if (child_status_registered) {
145 child_status_listener.deregister(event_loop);
148 if (onstart_flags.pass_cs_fd) {
152 bp_sys::close(control_socket[0]);
153 bp_sys::close(control_socket[1]);
157 bp_sys::close(pipefd[0]);
158 bp_sys::close(pipefd[1]);
163 base_process_service::base_process_service(service_set *sset, string name,
164 service_type_t service_type_p, string &&command,
165 std::list<std::pair<unsigned,unsigned>> &command_offsets,
166 const std::list<prelim_dep> &deplist_p)
167 : service_record(sset, name, service_type_p, deplist_p), child_listener(this),
168 child_status_listener(this), restart_timer(this)
170 program_name = std::move(command);
171 exec_arg_parts = separate_args(program_name, command_offsets);
173 restart_interval_count = 0;
174 restart_interval_time = {0, 0};
175 restart_timer.service = this;
176 restart_timer.add_timer(event_loop);
178 // By default, allow a maximum of 3 restarts within 10.0 seconds:
179 restart_interval.seconds() = 10;
180 restart_interval.nseconds() = 0;
181 max_restart_interval_count = 3;
183 waiting_restart_timer = false;
184 reserved_child_watch = false;
185 tracking_child = false;
186 stop_timer_armed = false;
187 start_is_interruptible = false;
190 void base_process_service::do_restart() noexcept
192 waiting_restart_timer = false;
193 restart_interval_count++;
194 auto service_state = get_state();
196 if (service_state == service_state_t::STARTING) {
197 // for a smooth recovery, we want to check dependencies are available before actually
199 if (! check_deps_started()) {
200 waiting_for_deps = true;
205 if (! start_ps_process(exec_arg_parts, have_console)) {
207 if (service_state == service_state_t::STARTING) {
211 // desired_state = service_state_t::STOPPED;
214 services->process_queues();
218 bool base_process_service::restart_ps_process() noexcept
220 using time_val = dasynq::time_val;
222 time_val current_time;
223 event_loop.get_time(current_time, clock_type::MONOTONIC);
225 if (max_restart_interval_count != 0) {
226 // Check whether we're still in the most recent restart check interval:
227 time_val int_diff = current_time - restart_interval_time;
228 if (int_diff < restart_interval) {
229 if (restart_interval_count >= max_restart_interval_count) {
230 log(loglevel_t::ERROR, "Service ", get_name(), " restarting too quickly; stopping.");
235 restart_interval_time = current_time;
236 restart_interval_count = 0;
240 // Check if enough time has lapsed since the previous restart. If not, start a timer:
241 time_val tdiff = current_time - last_start_time;
242 if (restart_delay <= tdiff) {
243 // > restart delay (normally 200ms)
247 time_val timeout = restart_delay - tdiff;
248 restart_timer.arm_timer_rel(event_loop, timeout);
249 waiting_restart_timer = true;
254 bool base_process_service::interrupt_start() noexcept
256 if (waiting_restart_timer) {
257 restart_timer.stop_timer(event_loop);
258 waiting_restart_timer = false;
259 return service_record::interrupt_start();
262 log(loglevel_t::WARN, "Interrupting start of service ", get_name(), " with pid ", pid, " (with SIGINT).");
264 if (stop_timeout != time_val(0,0)) {
265 restart_timer.arm_timer_rel(event_loop, stop_timeout);
266 stop_timer_armed = true;
268 else if (stop_timer_armed) {
269 restart_timer.stop_timer(event_loop);
270 stop_timer_armed = false;
272 set_state(service_state_t::STOPPING);
273 notify_listeners(service_event_t::STARTCANCELLED);
278 void base_process_service::kill_with_fire() noexcept
281 log(loglevel_t::WARN, "Service ", get_name(), " with pid ", pid, " exceeded allowed stop time; killing.");
286 void base_process_service::kill_pg(int signo) noexcept
288 pid_t pgid = bp_sys::getpgid(pid);
290 // only should happen if pid is invalid, which should never happen...
291 log(loglevel_t::ERROR, get_name(), ": can't signal process: ", strerror(errno));
294 bp_sys::kill(-pgid, signo);
297 void base_process_service::timer_expired() noexcept
299 stop_timer_armed = false;
302 // We are stopping, including after having startup cancelled (stop timeout, state is STOPPING); We are
303 // starting (start timeout, state is STARTING); We are waiting for restart timer before restarting,
304 // including smooth recovery (restart timeout, state is STARTING or STARTED).
305 if (get_state() == service_state_t::STOPPING) {
308 else if (pid != -1) {
309 // Starting, start timed out.
311 if (start_explicit) {
312 start_explicit = false;
318 // STARTING / STARTED, and we have a pid: must be restarting (smooth recovery if STARTED)
323 void base_process_service::emergency_stop() noexcept
325 if (! do_auto_restart() && start_explicit) {
326 start_explicit = false;
334 void base_process_service::becoming_inactive() noexcept
336 if (socket_fd != -1) {
342 bool base_process_service::open_socket() noexcept
344 if (socket_path.empty() || socket_fd != -1) {
345 // No socket, or already open
349 const char * saddrname = socket_path.c_str();
351 // Check the specified socket path
352 struct stat stat_buf;
353 if (stat(saddrname, &stat_buf) == 0) {
354 if ((stat_buf.st_mode & S_IFSOCK) == 0) {
356 log(loglevel_t::ERROR, get_name(), ": Activation socket file exists (and is not a socket)");
360 else if (errno != ENOENT) {
362 log(loglevel_t::ERROR, get_name(), ": Error checking activation socket: ", strerror(errno));
366 // Remove stale socket file (if it exists).
367 // We won't test the return from unlink - if it fails other than due to ENOENT, we should get an
368 // error when we try to create the socket anyway.
371 uint sockaddr_size = offsetof(struct sockaddr_un, sun_path) + socket_path.length() + 1;
372 struct sockaddr_un * name = static_cast<sockaddr_un *>(malloc(sockaddr_size));
373 if (name == nullptr) {
374 log(loglevel_t::ERROR, get_name(), ": Opening activation socket: out of memory");
378 name->sun_family = AF_UNIX;
379 strcpy(name->sun_path, saddrname);
381 int sockfd = dinit_socket(AF_UNIX, SOCK_STREAM, 0, SOCK_NONBLOCK | SOCK_CLOEXEC);
383 log(loglevel_t::ERROR, get_name(), ": Error creating activation socket: ", strerror(errno));
388 if (bind(sockfd, (struct sockaddr *) name, sockaddr_size) == -1) {
389 log(loglevel_t::ERROR, get_name(), ": Error binding activation socket: ", strerror(errno));
397 // POSIX (1003.1, 2013) says that fchown and fchmod don't necessarily work on sockets. We have to
398 // use chown and chmod instead.
399 if (chown(saddrname, socket_uid, socket_gid)) {
400 log(loglevel_t::ERROR, get_name(), ": Error setting activation socket owner/group: ", strerror(errno));
405 if (chmod(saddrname, socket_perms) == -1) {
406 log(loglevel_t::ERROR, get_name(), ": Error setting activation socket permissions: ", strerror(errno));
411 if (listen(sockfd, 128) == -1) { // 128 "seems reasonable".
412 log(loglevel_t::ERROR, ": Error listening on activation socket: ", strerror(errno));