Add SPDX license identifiers to source files under the LGPL

[thirdparty/systemd.git] / src / login / logind.c

diff --git a/src/login/logind.c b/src/login/logind.c
index 1cbc8f9fcc1e93fe13a35035b70e825c68f997a1..49ca367e188883b2488782379f41a4abc60d0a86 100644 (file)
--- a/src/login/logind.c
+++ b/src/login/logind.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
@@ -32,12 +33,13 @@
 #include "def.h"
 #include "dirent-util.h"
 #include "fd-util.h"
-#include "formats-util.h"
+#include "format-util.h"
 #include "logind.h"
 #include "selinux-util.h"
 #include "signal-util.h"
 #include "strv.h"
 #include "udev-util.h"
+#include "cgroup-util.h"
 
 static void manager_free(Manager *m);
 
@@ -61,10 +63,10 @@ static void manager_reset_config(Manager *m) {
         m->idle_action_usec = 30 * USEC_PER_MINUTE;
         m->idle_action = HANDLE_IGNORE;
 
-        m->runtime_dir_size = PAGE_ALIGN((size_t) (physical_memory() / 10)); /* 10% */
-        m->user_tasks_max = UINT64_C(12288);
-        m->sessions_max = UINT64_C(8192);
-        m->inhibitors_max = UINT64_C(8192);
+        m->runtime_dir_size = physical_memory_scale(10U, 100U); /* 10% */
+        m->user_tasks_max = system_tasks_max_scale(DEFAULT_USER_TASKS_MAX_PERCENTAGE, 100U); /* 33% */
+        m->sessions_max = 8192;
+        m->inhibitors_max = 8192;
 
         m->kill_user_processes = KILL_USER_PROCESSES;
 
@@ -125,7 +127,8 @@ static void manager_free(Manager *m) {
         Inhibitor *i;
         Button *b;
 
-        assert(m);
+        if (!m)
+                return;
 
         while ((session = hashmap_first(m->sessions)))
                 session_free(session);
@@ -407,10 +410,71 @@ static int manager_enumerate_users(Manager *m) {
         return r;
 }
 
+static int manager_attach_fds(Manager *m) {
+        _cleanup_strv_free_ char **fdnames = NULL;
+        int n, i, fd;
+
+        /* Upon restart, PID1 will send us back all fds of session devices
+         * that we previously opened. Each file descriptor is associated
+         * with a given session. The session ids are passed through FDNAMES. */
+
+        n = sd_listen_fds_with_names(true, &fdnames);
+        if (n <= 0)
+                return n;
+
+        for (i = 0; i < n; i++) {
+                struct stat st;
+                SessionDevice *sd;
+                Session *s;
+                char *id;
+
+                fd = SD_LISTEN_FDS_START + i;
+
+                id = startswith(fdnames[i], "session-");
+                if (!id)
+                        continue;
+
+                s = hashmap_get(m->sessions, id);
+                if (!s) {
+                        /* If the session doesn't exist anymore, the associated session
+                         * device attached to this fd doesn't either. Let's simply close
+                         * this fd. */
+                        log_debug("Failed to attach fd for unknown session: %s", id);
+                        close_nointr(fd);
+                        continue;
+                }
+
+                if (fstat(fd, &st) < 0) {
+                        /* The device is allowed to go away at a random point, in which
+                         * case fstat failing is expected. */
+                        log_debug_errno(errno, "Failed to stat device fd for session %s: %m", id);
+                        close_nointr(fd);
+                        continue;
+                }
+
+                sd = hashmap_get(s->devices, &st.st_rdev);
+                if (!sd) {
+                        /* Weird we got an fd for a session device which wasn't
+                        * recorded in the session state file... */
+                        log_warning("Got fd for missing session device [%u:%u] in session %s",
+                                    major(st.st_rdev), minor(st.st_rdev), s->id);
+                        close_nointr(fd);
+                        continue;
+                }
+
+                log_debug("Attaching fd to session device [%u:%u] for session %s",
+                          major(st.st_rdev), minor(st.st_rdev), s->id);
+
+                session_device_attach_fd(sd, fd, s->was_active);
+        }
+
+        return 0;
+}
+
 static int manager_enumerate_sessions(Manager *m) {
         _cleanup_closedir_ DIR *d = NULL;
         struct dirent *de;
-        int r = 0;
+        int r = 0, k;
 
         assert(m);
 
@@ -425,7 +489,6 @@ static int manager_enumerate_sessions(Manager *m) {
 
         FOREACH_DIRENT(de, d, return -errno) {
                 struct Session *s;
-                int k;
 
                 if (!dirent_is_file(de))
                         continue;
@@ -439,7 +502,6 @@ static int manager_enumerate_sessions(Manager *m) {
                 k = manager_add_session(m, de->d_name, &s);
                 if (k < 0) {
                         log_error_errno(k, "Failed to add session by file name %s: %m", de->d_name);
-
                         r = k;
                         continue;
                 }
@@ -451,6 +513,12 @@ static int manager_enumerate_sessions(Manager *m) {
                         r = k;
         }
 
+        /* We might be restarted and PID1 could have sent us back the
+         * session device fds we previously saved. */
+        k = manager_attach_fds(m);
+        if (k < 0)
+                log_warning_errno(k, "Failed to reattach session device fds: %m");
+
         return r;
 }
 
@@ -1001,11 +1069,11 @@ static int manager_dispatch_idle_action(sd_event_source *s, uint64_t t, void *us
 static int manager_parse_config_file(Manager *m) {
         assert(m);
 
-        return config_parse_many(PKGSYSCONFDIR "/logind.conf",
-                                 CONF_PATHS_NULSTR("systemd/logind.conf.d"),
-                                 "Login\0",
-                                 config_item_perf_lookup, logind_gperf_lookup,
-                                 false, m);
+        return config_parse_many_nulstr(PKGSYSCONFDIR "/logind.conf",
+                                        CONF_PATHS_NULSTR("systemd/logind.conf.d"),
+                                        "Login\0",
+                                        config_item_perf_lookup, logind_gperf_lookup,
+                                        CONFIG_PARSE_WARN, m);
 }
 
 static int manager_dispatch_reload_signal(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
@@ -1187,7 +1255,7 @@ int main(int argc, char *argv[]) {
                 goto finish;
         }
 
-        log_debug("systemd-logind running as pid "PID_FMT, getpid());
+        log_debug("systemd-logind running as pid "PID_FMT, getpid_cached());
 
         sd_notify(false,
                   "READY=1\n"
@@ -1195,7 +1263,7 @@ int main(int argc, char *argv[]) {
 
         r = manager_run(m);
 
-        log_debug("systemd-logind stopped as pid "PID_FMT, getpid());
+        log_debug("systemd-logind stopped as pid "PID_FMT, getpid_cached());
 
 finish:
         sd_notify(false,