implement recursive_stop/stop_when_unneeded unit flags

[elogind.git] / socket.c

diff --git a/socket.c b/socket.c
index cbddcaa77d880adc43acedbda9bd3fc999df05c0..3bfdf4148ddf2e3006bfccd53539d2a02f5b47cd 100644 (file)
--- a/socket.c
+++ b/socket.c
@@ -5,7 +5,7 @@
 #include <unistd.h>
 #include <errno.h>
 #include <fcntl.h>
-#include <sys/poll.h>
+#include <sys/epoll.h>
 #include <signal.h>
 
 #include "unit.h"
@@ -88,8 +88,11 @@ static int socket_init(Unit *u) {
         s->timeout_usec = DEFAULT_TIMEOUT_USEC;
         exec_context_init(&s->exec_context);
 
-        if ((r = unit_load_fragment_and_dropin(u)) < 0)
+        if ((r = unit_load_fragment_and_dropin(u)) <= 0) {
+                if (r == 0)
+                        r = -ENOENT;
                 goto fail;
+        }
 
         if (!(t = unit_name_change_suffix(unit_id(u), ".service"))) {
                 r = -ENOMEM;
@@ -140,6 +143,7 @@ static void socket_dump(Unit *u, FILE *f, const char *prefix) {
         char *prefix2;
 
         assert(s);
+        assert(f);
 
         prefix2 = strappend(prefix, "\t");
         if (!prefix2)
@@ -281,7 +285,7 @@ static int socket_watch_fds(Socket *s) {
                 if (p->fd < 0)
                         continue;
 
-                if ((r = unit_watch_fd(UNIT(s), p->fd, POLLIN, &p->fd_watch)) < 0)
+                if ((r = unit_watch_fd(UNIT(s), p->fd, EPOLLIN, &p->fd_watch)) < 0)
                         goto fail;
         }
 
@@ -339,7 +343,7 @@ static void socket_set_state(Socket *s, SocketState state) {
         if (state != SOCKET_LISTENING)
                 socket_unwatch_fds(s);
 
-        log_debug("%s changing %s → %s", unit_id(UNIT(s)), state_string_table[old_state], state_string_table[state]);
+        log_debug("%s changed %s → %s", unit_id(UNIT(s)), state_string_table[old_state], state_string_table[state]);
 
         unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state]);
 }
@@ -392,13 +396,13 @@ static void socket_enter_stop_post(Socket *s, bool success) {
         if (!success)
                 s->failure = true;
 
-        if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST])) {
-
+        if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST]))
                 if ((r = socket_spawn(s, s->control_command, true, &s->control_pid)) < 0)
                         goto fail;
 
-                socket_set_state(s, SOCKET_STOP_POST);
-        } else
+        socket_set_state(s, SOCKET_STOP_POST);
+
+        if (!s->control_command)
                 socket_enter_dead(s, true);
 
         return;
@@ -425,9 +429,11 @@ static void socket_enter_signal(Socket *s, SocketState state, bool success) {
                         r = -errno;
                         goto fail;
                 }
+        }
 
-                socket_set_state(s, state);
-        } else
+        socket_set_state(s, state);
+
+        if (s->control_pid <= 0)
                 socket_enter_dead(s, true);
 
         return;
@@ -448,13 +454,13 @@ static void socket_enter_stop_pre(Socket *s, bool success) {
         if (!success)
                 s->failure = true;
 
-        if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE])) {
-
+        if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE]))
                 if ((r = socket_spawn(s, s->control_command, true, &s->control_pid)) < 0)
                         goto fail;
 
-                socket_set_state(s, SOCKET_STOP_PRE);
-        } else
+        socket_set_state(s, SOCKET_STOP_PRE);
+
+        if (!s->control_command)
                 socket_enter_stop_post(s, true);
 
         return;
@@ -464,26 +470,41 @@ fail:
         socket_enter_stop_post(s, false);
 }
 
+static void socket_enter_listening(Socket *s) {
+        int r;
+        assert(s);
+
+        if ((r = socket_watch_fds(s)) < 0) {
+                log_warning("%s failed to watch sockets: %s", unit_id(UNIT(s)), strerror(-r));
+                goto fail;
+        }
+
+        socket_set_state(s, SOCKET_LISTENING);
+        return;
+
+fail:
+        socket_enter_stop_pre(s, false);
+}
+
 static void socket_enter_start_post(Socket *s) {
         int r;
         assert(s);
 
-        if ((r = socket_open_fds(s)) < 0 ||
-            (r = socket_watch_fds(s)) < 0) {
+        if ((r = socket_open_fds(s)) < 0) {
                 log_warning("%s failed to listen on sockets: %s", unit_id(UNIT(s)), strerror(-r));
                 goto fail;
         }
 
-        if ((s->control_command = s->exec_command[SOCKET_EXEC_START_POST])) {
-
+        if ((s->control_command = s->exec_command[SOCKET_EXEC_START_POST]))
                 if ((r = socket_spawn(s, s->control_command, true, &s->control_pid)) < 0) {
                         log_warning("%s failed to run start-post executable: %s", unit_id(UNIT(s)), strerror(-r));
                         goto fail;
                 }
 
-                socket_set_state(s, SOCKET_START_POST);
-        } else
-                socket_set_state(s, SOCKET_LISTENING);
+        socket_set_state(s, SOCKET_START_POST);
+
+        if (!s->control_command)
+                socket_enter_listening(s);
 
         return;
 
@@ -495,13 +516,13 @@ static void socket_enter_start_pre(Socket *s) {
         int r;
         assert(s);
 
-        if ((s->control_command = s->exec_command[SOCKET_EXEC_START_PRE])) {
-
+        if ((s->control_command = s->exec_command[SOCKET_EXEC_START_PRE]))
                 if ((r = socket_spawn(s, s->control_command, true, &s->control_pid)) < 0)
                         goto fail;
 
-                socket_set_state(s, SOCKET_START_PRE);
-        } else
+        socket_set_state(s, SOCKET_START_PRE);
+
+        if (!s->control_command)
                 socket_enter_start_post(s);
 
         return;
@@ -611,9 +632,9 @@ static void socket_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
 
         assert(s);
 
-        log_info("Incoming traffic on %s", unit_id(u));
+        log_debug("Incoming traffic on %s", unit_id(u));
 
-        if (events != POLLIN)
+        if (events != EPOLLIN)
                 socket_enter_stop_pre(s, false);
 
         socket_enter_running(s);
@@ -626,7 +647,7 @@ static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
         assert(s);
         assert(pid >= 0);
 
-        success = code == CLD_EXITED || status == 0;
+        success = code == CLD_EXITED && status == 0;
         s->failure = s->failure || !success;
 
         assert(s->control_pid == pid);
@@ -645,7 +666,7 @@ static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
                 /* No further commands for this step, so let's figure
                  * out what to do next */
 
-                log_debug("%s finished with state %s", unit_id(u), state_string_table[s->state]);
+                log_debug("%s got final SIGCHLD for state %s", unit_id(u), state_string_table[s->state]);
 
                 switch (s->state) {
 
@@ -658,7 +679,7 @@ static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
 
                 case SOCKET_START_POST:
                         if (success)
-                                socket_set_state(s, SOCKET_LISTENING);
+                                socket_enter_listening(s);
                         else
                                 socket_enter_stop_pre(s, false);
                         break;
@@ -764,6 +785,17 @@ int socket_collect_fds(Socket *s, int **fds, unsigned *n_fds) {
         return 0;
 }
 
+void socket_notify_service_dead(Socket *s) {
+        assert(s);
+
+        /* The service is dead. Dang. */
+
+        if (s->state == SOCKET_RUNNING) {
+                log_debug("%s got notified about service death.", unit_id(UNIT(s)));
+                socket_enter_listening(s);
+        }
+}
+
 const UnitVTable socket_vtable = {
         .suffix = ".socket",