709 lines
17 KiB
C
709 lines
17 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2011 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include "logind-session.h"
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#include "strv.h"
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#include "util.h"
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#include "cgroup-util.h"
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#define IDLE_THRESHOLD_USEC (5*USEC_PER_MINUTE)
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Session* session_new(Manager *m, User *u, const char *id) {
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Session *s;
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assert(m);
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assert(id);
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s = new0(Session, 1);
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if (!s)
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return NULL;
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s->state_file = strappend("/run/systemd/session/", id);
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if (!s->state_file) {
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free(s);
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return NULL;
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}
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s->id = file_name_from_path(s->state_file);
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if (hashmap_put(m->sessions, s->id, s) < 0) {
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free(s->id);
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free(s);
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return NULL;
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}
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s->manager = m;
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s->pipe_fd = -1;
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s->user = u;
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LIST_PREPEND(Session, sessions_by_user, u->sessions, s);
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return s;
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}
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void session_free(Session *s) {
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assert(s);
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if (s->in_gc_queue)
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LIST_REMOVE(Session, gc_queue, s->manager->session_gc_queue, s);
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if (s->user) {
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LIST_REMOVE(Session, sessions_by_user, s->user->sessions, s);
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if (s->user->display == s)
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s->user->display = NULL;
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}
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if (s->seat) {
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if (s->seat->active == s)
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s->seat->active = NULL;
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LIST_REMOVE(Session, sessions_by_seat, s->seat->sessions, s);
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}
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free(s->cgroup_path);
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strv_free(s->controllers);
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free(s->tty);
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free(s->display);
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free(s->remote_host);
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free(s->remote_user);
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hashmap_remove(s->manager->sessions, s->id);
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free(s->state_file);
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free(s);
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}
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int session_save(Session *s) {
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FILE *f;
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int r = 0;
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char *temp_path;
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assert(s);
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r = safe_mkdir("/run/systemd/session", 0755, 0, 0);
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if (r < 0)
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goto finish;
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r = fopen_temporary(s->state_file, &f, &temp_path);
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if (r < 0)
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goto finish;
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assert(s->user);
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fchmod(fileno(f), 0644);
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fprintf(f,
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"# This is private data. Do not parse.\n"
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"UID=%lu\n"
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"USER=%s\n"
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"ACTIVE=%i\n"
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"REMOTE=%i\n"
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"KILL_PROCESSES=%i\n",
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(unsigned long) s->user->uid,
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s->user->name,
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session_is_active(s),
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s->remote,
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s->kill_processes);
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if (s->cgroup_path)
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fprintf(f,
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"CGROUP=%s\n",
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s->cgroup_path);
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if (s->seat)
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fprintf(f,
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"SEAT=%s\n",
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s->seat->id);
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if (s->tty)
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fprintf(f,
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"TTY=%s\n",
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s->tty);
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if (s->display)
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fprintf(f,
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"DISPLAY=%s\n",
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s->display);
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if (s->remote_host)
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fprintf(f,
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"REMOTE_HOST=%s\n",
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s->remote_host);
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if (s->remote_user)
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fprintf(f,
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"REMOTE_USER=%s\n",
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s->remote_user);
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if (s->seat && seat_is_vtconsole(s->seat))
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fprintf(f,
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"VTNR=%i\n",
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s->vtnr);
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if (s->leader > 0)
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fprintf(f,
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"LEADER=%lu\n",
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(unsigned long) s->leader);
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if (s->audit_id > 0)
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fprintf(f,
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"AUDIT=%llu\n",
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(unsigned long long) s->audit_id);
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fflush(f);
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if (ferror(f) || rename(temp_path, s->state_file) < 0) {
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r = -errno;
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unlink(s->state_file);
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unlink(temp_path);
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}
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fclose(f);
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free(temp_path);
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finish:
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if (r < 0)
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log_error("Failed to save session data for %s: %s", s->id, strerror(-r));
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return r;
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}
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int session_load(Session *s) {
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char *remote = NULL,
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*kill_processes = NULL,
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*seat = NULL,
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*vtnr = NULL,
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*leader = NULL,
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*audit_id = NULL;
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int k, r;
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assert(s);
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r = parse_env_file(s->state_file, NEWLINE,
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"REMOTE", &remote,
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"KILL_PROCESSES", &kill_processes,
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"CGROUP", &s->cgroup_path,
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"SEAT", &seat,
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"TTY", &s->tty,
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"DISPLAY", &s->display,
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"REMOTE_HOST", &s->remote_host,
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"REMOTE_USER", &s->remote_user,
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"VTNR", &vtnr,
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"LEADER", &leader,
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"AUDIT_ID", &audit_id,
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NULL);
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if (r < 0)
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goto finish;
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if (remote) {
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k = parse_boolean(remote);
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if (k >= 0)
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s->remote = k;
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}
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if (kill_processes) {
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k = parse_boolean(kill_processes);
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if (k >= 0)
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s->kill_processes = k;
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}
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if (seat && !s->seat) {
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Seat *o;
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o = hashmap_get(s->manager->seats, seat);
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if (o)
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seat_attach_session(o, s);
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}
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if (vtnr && s->seat && seat_is_vtconsole(s->seat)) {
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int v;
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k = safe_atoi(vtnr, &v);
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if (k >= 0 && v >= 1)
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s->vtnr = v;
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}
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if (leader) {
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pid_t pid;
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k = parse_pid(leader, &pid);
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if (k >= 0 && pid >= 1)
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s->leader = pid;
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}
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if (audit_id) {
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uint32_t l;
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k = safe_atou32(audit_id, &l);
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if (k >= 0 && l >= l)
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s->audit_id = l;
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}
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finish:
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free(remote);
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free(kill_processes);
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free(seat);
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free(vtnr);
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free(leader);
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free(audit_id);
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return r;
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}
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int session_activate(Session *s) {
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int r;
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Session *old_active;
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assert(s);
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if (s->vtnr < 0)
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return -ENOTSUP;
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if (!s->seat)
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return -ENOTSUP;
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if (s->seat->active == s)
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return 0;
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assert(seat_is_vtconsole(s->seat));
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r = chvt(s->vtnr);
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if (r < 0)
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return r;
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old_active = s->seat->active;
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s->seat->active = s;
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return seat_apply_acls(s->seat, old_active);
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}
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bool x11_display_is_local(const char *display) {
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assert(display);
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return
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display[0] == ':' &&
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display[1] >= '0' &&
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display[1] <= '9';
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}
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static int session_link_x11_socket(Session *s) {
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char *t, *f, *c;
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size_t k;
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assert(s);
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assert(s->user);
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assert(s->user->runtime_path);
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if (s->user->display)
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return 0;
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if (!s->display || !x11_display_is_local(s->display))
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return 0;
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k = strspn(s->display+1, "0123456789");
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f = new(char, sizeof("/tmp/.X11-unix/X") + k);
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if (!f) {
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log_error("Out of memory");
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return -ENOMEM;
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}
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c = stpcpy(f, "/tmp/.X11-unix/X");
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memcpy(c, s->display+1, k);
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c[k] = 0;
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if (access(f, F_OK) < 0) {
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log_warning("Session %s has display %s with nonexisting socket %s.", s->id, s->display, f);
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free(f);
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return -ENOENT;
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}
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t = strappend(s->user->runtime_path, "/display");
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if (!t) {
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log_error("Out of memory");
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free(f);
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return -ENOMEM;
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}
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if (link(f, t) < 0) {
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if (errno == EEXIST) {
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unlink(t);
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if (link(f, t) >= 0)
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goto done;
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}
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if (symlink(f, t) < 0) {
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if (errno == EEXIST) {
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unlink(t);
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if (symlink(f, t) >= 0)
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goto done;
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}
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log_error("Failed to link %s to %s: %m", f, t);
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free(f);
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free(t);
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return -errno;
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}
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}
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done:
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log_info("Linked %s to %s.", f, t);
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free(f);
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free(t);
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s->user->display = s;
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return 0;
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}
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static int session_create_cgroup(Session *s) {
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char **k;
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char *p;
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int r;
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assert(s);
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assert(s->user);
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assert(s->user->cgroup_path);
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if (!s->cgroup_path) {
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if (asprintf(&p, "%s/%s", s->user->cgroup_path, s->id) < 0) {
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log_error("Out of memory");
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return -ENOMEM;
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}
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} else
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p = s->cgroup_path;
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if (s->leader > 0)
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r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, p, s->leader);
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else
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r = cg_create(SYSTEMD_CGROUP_CONTROLLER, p);
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if (r < 0) {
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free(p);
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s->cgroup_path = NULL;
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log_error("Failed to create "SYSTEMD_CGROUP_CONTROLLER":%s: %s", p, strerror(-r));
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return r;
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}
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s->cgroup_path = p;
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STRV_FOREACH(k, s->manager->controllers) {
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if (s->leader > 0)
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r = cg_create_and_attach(*k, p, s->leader);
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else
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r = cg_create(*k, p);
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if (r < 0)
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log_warning("Failed to create cgroup %s:%s: %s", *k, p, strerror(-r));
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}
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return 0;
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}
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int session_start(Session *s) {
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int r;
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assert(s);
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assert(s->user);
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if (s->started)
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return 0;
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/* Create cgroup */
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r = session_create_cgroup(s);
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if (r < 0)
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return r;
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/* Create X11 symlink */
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session_link_x11_socket(s);
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/* Save session data */
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session_save(s);
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dual_timestamp_get(&s->timestamp);
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s->started = true;
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session_send_signal(s, true);
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if (s->seat) {
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if (s->seat->active == s)
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seat_send_changed(s->seat, "Sessions\0ActiveSession\0");
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else
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seat_send_changed(s->seat, "Sessions\0");
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}
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user_send_changed(s->user, "Sessions\0");
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return 0;
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}
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static bool session_shall_kill(Session *s) {
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assert(s);
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return s->kill_processes;
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}
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static int session_kill_cgroup(Session *s) {
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int r;
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char **k;
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assert(s);
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if (!s->cgroup_path)
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return 0;
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cg_trim(SYSTEMD_CGROUP_CONTROLLER, s->cgroup_path, false);
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if (session_shall_kill(s)) {
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r = cg_kill_recursive_and_wait(SYSTEMD_CGROUP_CONTROLLER, s->cgroup_path, true);
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if (r < 0)
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log_error("Failed to kill session cgroup: %s", strerror(-r));
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} else {
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r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, s->cgroup_path, true);
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if (r < 0)
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log_error("Failed to check session cgroup: %s", strerror(-r));
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else if (r > 0) {
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r = cg_delete(SYSTEMD_CGROUP_CONTROLLER, s->cgroup_path);
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if (r < 0)
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log_error("Failed to delete session cgroup: %s", strerror(-r));
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} else
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r = -EBUSY;
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}
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STRV_FOREACH(k, s->user->manager->controllers)
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cg_trim(*k, s->cgroup_path, true);
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free(s->cgroup_path);
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s->cgroup_path = NULL;
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return r;
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}
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static int session_unlink_x11_socket(Session *s) {
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char *t;
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int r;
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assert(s);
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assert(s->user);
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if (s->user->display != s)
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return 0;
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s->user->display = NULL;
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t = strappend(s->user->runtime_path, "/display");
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if (!t) {
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log_error("Out of memory");
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return -ENOMEM;
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}
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r = unlink(t);
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free(t);
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return r < 0 ? -errno : 0;
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}
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int session_stop(Session *s) {
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int r = 0, k;
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assert(s);
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if (!s->started)
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return 0;
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/* Kill cgroup */
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k = session_kill_cgroup(s);
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if (k < 0)
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r = k;
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/* Remove X11 symlink */
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session_unlink_x11_socket(s);
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unlink(s->state_file);
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session_add_to_gc_queue(s);
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session_send_signal(s, false);
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if (s->seat) {
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if (s->seat->active == s)
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seat_set_active(s->seat, NULL);
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seat_send_changed(s->seat, "Sessions\0");
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}
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user_send_changed(s->user, "Sessions\0");
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s->started = false;
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return r;
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}
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bool session_is_active(Session *s) {
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assert(s);
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if (!s->seat)
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return true;
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return s->seat->active == s;
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}
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int session_get_idle_hint(Session *s, dual_timestamp *t) {
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char *p;
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struct stat st;
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usec_t u, n;
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bool b;
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int k;
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assert(s);
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if (s->idle_hint) {
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if (t)
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*t = s->idle_hint_timestamp;
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return s->idle_hint;
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}
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if (isempty(s->tty))
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goto dont_know;
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if (s->tty[0] != '/') {
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p = strappend("/dev/", s->tty);
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if (!p)
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return -ENOMEM;
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} else
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p = NULL;
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|
|
|
if (!startswith(p ? p : s->tty, "/dev/")) {
|
|
free(p);
|
|
goto dont_know;
|
|
}
|
|
|
|
k = lstat(p ? p : s->tty, &st);
|
|
free(p);
|
|
|
|
if (k < 0)
|
|
goto dont_know;
|
|
|
|
u = timespec_load(&st.st_atim);
|
|
n = now(CLOCK_REALTIME);
|
|
b = u + IDLE_THRESHOLD_USEC < n;
|
|
|
|
if (t)
|
|
dual_timestamp_from_realtime(t, u + b ? IDLE_THRESHOLD_USEC : 0);
|
|
|
|
return b;
|
|
|
|
dont_know:
|
|
if (t)
|
|
*t = s->idle_hint_timestamp;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void session_set_idle_hint(Session *s, bool b) {
|
|
assert(s);
|
|
|
|
if (s->idle_hint == b)
|
|
return;
|
|
|
|
s->idle_hint = b;
|
|
dual_timestamp_get(&s->idle_hint_timestamp);
|
|
|
|
session_send_changed(s,
|
|
"IdleHint\0"
|
|
"IdleSinceHint\0"
|
|
"IdleSinceHintMonotonic\0");
|
|
|
|
if (s->seat)
|
|
seat_send_changed(s->seat,
|
|
"IdleHint\0"
|
|
"IdleSinceHint\0"
|
|
"IdleSinceHintMonotonic\0");
|
|
|
|
user_send_changed(s->user,
|
|
"IdleHint\0"
|
|
"IdleSinceHint\0"
|
|
"IdleSinceHintMonotonic\0");
|
|
|
|
manager_send_changed(s->manager,
|
|
"IdleHint\0"
|
|
"IdleSinceHint\0"
|
|
"IdleSinceHintMonotonic\0");
|
|
}
|
|
|
|
int session_check_gc(Session *s) {
|
|
int r;
|
|
|
|
assert(s);
|
|
|
|
if (s->pipe_fd >= 0) {
|
|
|
|
r = pipe_eof(s->pipe_fd);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (r == 0)
|
|
return 1;
|
|
}
|
|
|
|
if (s->cgroup_path) {
|
|
|
|
r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, s->cgroup_path, false);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (r <= 0)
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void session_add_to_gc_queue(Session *s) {
|
|
assert(s);
|
|
|
|
if (s->in_gc_queue)
|
|
return;
|
|
|
|
LIST_PREPEND(Session, gc_queue, s->manager->session_gc_queue, s);
|
|
s->in_gc_queue = true;
|
|
}
|
|
|
|
static const char* const session_type_table[_SESSION_TYPE_MAX] = {
|
|
[SESSION_TTY] = "tty",
|
|
[SESSION_X11] = "x11"
|
|
};
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(session_type, SessionType);
|