4 #include <sys/socket.h>
10 #include "dinit-log.h"
11 #include "dinit-socket.h"
12 #include "proc-service.h"
14 #include "baseproc-sys.h"
17 * Base process implementation (base_process_service).
19 * See proc-service.h for interface documentation.
22 void base_process_service::do_smooth_recovery() noexcept
24 if (! restart_ps_process()) {
26 services->process_queues();
30 bool base_process_service::bring_up() noexcept
34 return restart_ps_process();
39 if (! open_socket()) {
43 event_loop.get_time(restart_interval_time, clock_type::MONOTONIC);
44 restart_interval_count = 0;
45 if (start_ps_process(exec_arg_parts, onstart_flags.starts_on_console)) {
46 // Note: we don't set a start timeout for PROCESS services.
47 if (start_timeout != time_val(0,0) && get_type() != service_type_t::PROCESS) {
48 restart_timer.arm_timer_rel(event_loop, start_timeout);
49 stop_timer_armed = true;
51 else if (stop_timer_armed) {
52 restart_timer.stop_timer(event_loop);
53 stop_timer_armed = false;
61 bool base_process_service::start_ps_process(const std::vector<const char *> &cmd, bool on_console) noexcept
63 // In general, you can't tell whether fork/exec is successful. We use a pipe to communicate
64 // success/failure from the child to the parent. The pipe is set CLOEXEC so a successful
65 // exec closes the pipe, and the parent sees EOF. If the exec is unsuccessful, the errno
66 // is written to the pipe, and the parent can read it.
68 event_loop.get_time(last_start_time, clock_type::MONOTONIC);
71 if (bp_sys::pipe2(pipefd, O_CLOEXEC)) {
72 log(loglevel_t::ERROR, get_name(), ": can't create status check pipe: ", strerror(errno));
76 const char * logfile = this->logfile.c_str();
78 logfile = "/dev/null";
81 bool child_status_registered = false;
82 control_conn_t *control_conn = nullptr;
84 int control_socket[2] = {-1, -1};
85 if (onstart_flags.pass_cs_fd) {
86 if (dinit_socketpair(AF_UNIX, SOCK_STREAM, /* protocol */ 0, control_socket, SOCK_NONBLOCK)) {
87 log(loglevel_t::ERROR, get_name(), ": can't create control socket: ", strerror(errno));
91 // Make the server side socket close-on-exec:
92 int fdflags = bp_sys::fcntl(control_socket[0], F_GETFD);
93 bp_sys::fcntl(control_socket[0], F_SETFD, fdflags | FD_CLOEXEC);
96 control_conn = new control_conn_t(event_loop, services, control_socket[0]);
98 catch (std::exception &exc) {
99 log(loglevel_t::ERROR, get_name(), ": can't launch process; out of memory");
104 // Set up complete, now fork and exec:
109 child_status_listener.add_watch(event_loop, pipefd[0], dasynq::IN_EVENTS);
110 child_status_registered = true;
112 // We specify a high priority (i.e. low priority value) so that process termination is
113 // handled early. This means we have always recorded that the process is terminated by the
114 // time that we handle events that might otherwise cause us to signal the process, so we
115 // avoid sending a signal to an invalid (and possibly recycled) process ID.
116 forkpid = child_listener.fork(event_loop, reserved_child_watch, dasynq::DEFAULT_PRIORITY - 10);
117 reserved_child_watch = true;
119 catch (std::exception &e) {
120 log(loglevel_t::ERROR, get_name(), ": Could not fork: ", e.what());
125 run_child_proc(cmd.data(), logfile, on_console, pipefd[1], control_socket[1], socket_fd,
126 run_as_uid, run_as_gid);
130 bp_sys::close(pipefd[1]); // close the 'other end' fd
131 if (control_socket[1] != -1) {
132 bp_sys::close(control_socket[1]);
136 waiting_for_execstat = true;
143 if (child_status_registered) {
144 child_status_listener.deregister(event_loop);
147 if (onstart_flags.pass_cs_fd) {
151 bp_sys::close(control_socket[0]);
152 bp_sys::close(control_socket[1]);
156 bp_sys::close(pipefd[0]);
157 bp_sys::close(pipefd[1]);
162 base_process_service::base_process_service(service_set *sset, string name,
163 service_type_t service_type_p, string &&command,
164 std::list<std::pair<unsigned,unsigned>> &command_offsets,
165 const std::list<prelim_dep> &deplist_p)
166 : service_record(sset, name, service_type_p, deplist_p), child_listener(this),
167 child_status_listener(this), restart_timer(this)
169 program_name = std::move(command);
170 exec_arg_parts = separate_args(program_name, command_offsets);
172 restart_interval_count = 0;
173 restart_interval_time = {0, 0};
174 restart_timer.service = this;
175 restart_timer.add_timer(event_loop);
177 // By default, allow a maximum of 3 restarts within 10.0 seconds:
178 restart_interval.seconds() = 10;
179 restart_interval.nseconds() = 0;
180 max_restart_interval_count = 3;
182 waiting_restart_timer = false;
183 reserved_child_watch = false;
184 tracking_child = false;
185 stop_timer_armed = false;
186 start_is_interruptible = false;
189 void base_process_service::do_restart() noexcept
191 waiting_restart_timer = false;
192 restart_interval_count++;
193 auto service_state = get_state();
195 if (service_state == service_state_t::STARTING) {
196 // for a smooth recovery, we want to check dependencies are available before actually
198 if (! check_deps_started()) {
199 waiting_for_deps = true;
204 if (! start_ps_process(exec_arg_parts, have_console)) {
206 if (service_state == service_state_t::STARTING) {
210 // desired_state = service_state_t::STOPPED;
213 services->process_queues();
217 bool base_process_service::restart_ps_process() noexcept
219 using time_val = dasynq::time_val;
221 time_val current_time;
222 event_loop.get_time(current_time, clock_type::MONOTONIC);
224 if (max_restart_interval_count != 0) {
225 // Check whether we're still in the most recent restart check interval:
226 time_val int_diff = current_time - restart_interval_time;
227 if (int_diff < restart_interval) {
228 if (restart_interval_count >= max_restart_interval_count) {
229 log(loglevel_t::ERROR, "Service ", get_name(), " restarting too quickly; stopping.");
234 restart_interval_time = current_time;
235 restart_interval_count = 0;
239 // Check if enough time has lapsed since the previous restart. If not, start a timer:
240 time_val tdiff = current_time - last_start_time;
241 if (restart_delay <= tdiff) {
242 // > restart delay (normally 200ms)
246 time_val timeout = restart_delay - tdiff;
247 restart_timer.arm_timer_rel(event_loop, timeout);
248 waiting_restart_timer = true;
253 bool base_process_service::interrupt_start() noexcept
255 if (waiting_restart_timer) {
256 restart_timer.stop_timer(event_loop);
257 waiting_restart_timer = false;
258 return service_record::interrupt_start();
261 log(loglevel_t::WARN, "Interrupting start of service ", get_name(), " with pid ", pid, " (with SIGINT).");
263 if (stop_timeout != time_val(0,0)) {
264 restart_timer.arm_timer_rel(event_loop, stop_timeout);
265 stop_timer_armed = true;
267 else if (stop_timer_armed) {
268 restart_timer.stop_timer(event_loop);
269 stop_timer_armed = false;
271 set_state(service_state_t::STOPPING);
272 notify_listeners(service_event_t::STARTCANCELLED);
277 void base_process_service::kill_with_fire() noexcept
280 log(loglevel_t::WARN, "Service ", get_name(), " with pid ", pid, " exceeded allowed stop time; killing.");
285 void base_process_service::kill_pg(int signo) noexcept
287 pid_t pgid = bp_sys::getpgid(pid);
289 // only should happen if pid is invalid, which should never happen...
290 log(loglevel_t::ERROR, get_name(), ": can't signal process: ", strerror(errno));
293 bp_sys::kill(-pgid, signo);
296 void base_process_service::timer_expired() noexcept
298 stop_timer_armed = false;
301 // We are stopping, including after having startup cancelled (stop timeout, state is STOPPING); We are
302 // starting (start timeout, state is STARTING); We are waiting for restart timer before restarting,
303 // including smooth recovery (restart timeout, state is STARTING or STARTED).
304 if (get_state() == service_state_t::STOPPING) {
307 else if (pid != -1) {
308 // Starting, start timed out.
310 if (start_explicit) {
311 start_explicit = false;
317 // STARTING / STARTED, and we have a pid: must be restarting (smooth recovery if STARTED)
322 void base_process_service::emergency_stop() noexcept
324 if (! do_auto_restart() && start_explicit) {
325 start_explicit = false;
333 void base_process_service::becoming_inactive() noexcept
335 if (socket_fd != -1) {
341 bool base_process_service::open_socket() noexcept
343 if (socket_path.empty() || socket_fd != -1) {
344 // No socket, or already open
348 const char * saddrname = socket_path.c_str();
350 // Check the specified socket path
351 struct stat stat_buf;
352 if (stat(saddrname, &stat_buf) == 0) {
353 if ((stat_buf.st_mode & S_IFSOCK) == 0) {
355 log(loglevel_t::ERROR, get_name(), ": Activation socket file exists (and is not a socket)");
359 else if (errno != ENOENT) {
361 log(loglevel_t::ERROR, get_name(), ": Error checking activation socket: ", strerror(errno));
365 // Remove stale socket file (if it exists).
366 // We won't test the return from unlink - if it fails other than due to ENOENT, we should get an
367 // error when we try to create the socket anyway.
370 uint sockaddr_size = offsetof(struct sockaddr_un, sun_path) + socket_path.length() + 1;
371 struct sockaddr_un * name = static_cast<sockaddr_un *>(malloc(sockaddr_size));
372 if (name == nullptr) {
373 log(loglevel_t::ERROR, get_name(), ": Opening activation socket: out of memory");
377 name->sun_family = AF_UNIX;
378 strcpy(name->sun_path, saddrname);
380 int sockfd = dinit_socket(AF_UNIX, SOCK_STREAM, 0, SOCK_NONBLOCK | SOCK_CLOEXEC);
382 log(loglevel_t::ERROR, get_name(), ": Error creating activation socket: ", strerror(errno));
387 if (bind(sockfd, (struct sockaddr *) name, sockaddr_size) == -1) {
388 log(loglevel_t::ERROR, get_name(), ": Error binding activation socket: ", strerror(errno));
396 // POSIX (1003.1, 2013) says that fchown and fchmod don't necessarily work on sockets. We have to
397 // use chown and chmod instead.
398 if (chown(saddrname, socket_uid, socket_gid)) {
399 log(loglevel_t::ERROR, get_name(), ": Error setting activation socket owner/group: ", strerror(errno));
404 if (chmod(saddrname, socket_perms) == -1) {
405 log(loglevel_t::ERROR, get_name(), ": Error setting activation socket permissions: ", strerror(errno));
410 if (listen(sockfd, 128) == -1) { // 128 "seems reasonable".
411 log(loglevel_t::ERROR, ": Error listening on activation socket: ", strerror(errno));