X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Flogin%2Flogind-session.c;h=da7ce42015cac814cbf7e22d86ee545ae97dbce8;hp=a43ecad2b1d46750213198e053cc955fc35e48cf;hb=a32360f1a5a85c12f00e9dfb7353280067cccb5b;hpb=669241a076108e0483d7d8475beaa506106d077e diff --git a/src/login/logind-session.c b/src/login/logind-session.c index a43ecad2b..da7ce4201 100644 --- a/src/login/logind-session.c +++ b/src/login/logind-session.c @@ -25,14 +25,15 @@ #include #include +#include "systemd/sd-id128.h" +#include "systemd/sd-messages.h" #include "strv.h" #include "util.h" #include "mkdir.h" #include "path-util.h" #include "cgroup-util.h" #include "logind-session.h" - -#define IDLE_THRESHOLD_USEC (5*USEC_PER_MINUTE) +#include "fileio.h" Session* session_new(Manager *m, User *u, const char *id) { Session *s; @@ -374,10 +375,8 @@ static int session_link_x11_socket(Session *s) { k = strspn(s->display+1, "0123456789"); f = new(char, sizeof("/tmp/.X11-unix/X") + k); - if (!f) { - log_error("Out of memory."); - return -ENOMEM; - } + if (!f) + return log_oom(); c = stpcpy(f, "/tmp/.X11-unix/X"); memcpy(c, s->display+1, k); @@ -395,9 +394,8 @@ static int session_link_x11_socket(Session *s) { t = strappend(s->user->runtime_path, "/X11-display"); if (!t) { - log_error("Out of memory."); free(f); - return -ENOMEM; + return log_oom(); } if (link(f, t) < 0) { @@ -444,9 +442,9 @@ static int session_create_one_group(Session *s, const char *controller, const ch if (s->leader > 0) { r = cg_create_and_attach(controller, path, s->leader); if (r < 0) - r = cg_create(controller, path); + r = cg_create(controller, path, NULL); } else - r = cg_create(controller, path); + r = cg_create(controller, path, NULL); if (r < 0) return r; @@ -468,10 +466,8 @@ static int session_create_cgroup(Session *s) { assert(s->user->cgroup_path); if (!s->cgroup_path) { - if (asprintf(&p, "%s/%s", s->user->cgroup_path, s->id) < 0) { - log_error("Out of memory."); - return -ENOMEM; - } + if (asprintf(&p, "%s/%s", s->user->cgroup_path, s->id) < 0) + return log_oom(); } else p = s->cgroup_path; @@ -529,7 +525,9 @@ static int session_create_cgroup(Session *s) { } } - hashmap_put(s->manager->session_cgroups, s->cgroup_path, s); + r = hashmap_put(s->manager->session_cgroups, s->cgroup_path, s); + if (r < 0) + log_warning("Failed to create mapping between cgroup and session"); return 0; } @@ -547,8 +545,13 @@ int session_start(Session *s) { if (r < 0) return r; - log_full(s->type == SESSION_TTY || s->type == SESSION_X11 ? LOG_INFO : LOG_DEBUG, - "New session %s of user %s.", s->id, s->user->name); + log_struct(s->type == SESSION_TTY || s->type == SESSION_X11 ? LOG_INFO : LOG_DEBUG, + MESSAGE_ID(SD_MESSAGE_SESSION_START), + "SESSION_ID=%s", s->id, + "USER_ID=%s", s->user->name, + "LEADER=%lu", (unsigned long) s->leader, + "MESSAGE=New session %s of user %s.", s->id, s->user->name, + NULL); /* Create cgroup */ r = session_create_cgroup(s); @@ -669,10 +672,8 @@ static int session_unlink_x11_socket(Session *s) { s->user->display = NULL; t = strappend(s->user->runtime_path, "/X11-display"); - if (!t) { - log_error("Out of memory."); - return -ENOMEM; - } + if (!t) + return log_oom(); r = unlink(t); free(t); @@ -686,8 +687,13 @@ int session_stop(Session *s) { assert(s); if (s->started) - log_full(s->type == SESSION_TTY || s->type == SESSION_X11 ? LOG_INFO : LOG_DEBUG, - "Removed session %s.", s->id); + log_struct(s->type == SESSION_TTY || s->type == SESSION_X11 ? LOG_INFO : LOG_DEBUG, + MESSAGE_ID(SD_MESSAGE_SESSION_STOP), + "SESSION_ID=%s", s->id, + "USER_ID=%s", s->user->name, + "LEADER=%lu", (unsigned long) s->leader, + "MESSAGE=Removed session %s.", s->id, + NULL); /* Kill cgroup */ k = session_terminate_cgroup(s); @@ -704,16 +710,18 @@ int session_stop(Session *s) { if (s->started) session_send_signal(s, false); + s->started = false; + if (s->seat) { if (s->seat->active == s) seat_set_active(s->seat, NULL); seat_send_changed(s->seat, "Sessions\0"); + seat_save(s->seat); } user_send_changed(s->user, "Sessions\0"); - - s->started = false; + user_save(s->user); return r; } @@ -727,15 +735,50 @@ bool session_is_active(Session *s) { return s->seat->active == s; } -int session_get_idle_hint(Session *s, dual_timestamp *t) { - char *p; +static int get_tty_atime(const char *tty, usec_t *atime) { + _cleanup_free_ char *p = NULL; struct stat st; - usec_t u, n; - bool b; - int k; + + assert(tty); + assert(atime); + + if (!path_is_absolute(tty)) { + p = strappend("/dev/", tty); + if (!p) + return -ENOMEM; + + tty = p; + } else if (!path_startswith(tty, "/dev/")) + return -ENOENT; + + if (lstat(tty, &st) < 0) + return -errno; + + *atime = timespec_load(&st.st_atim); + return 0; +} + +static int get_process_ctty_atime(pid_t pid, usec_t *atime) { + _cleanup_free_ char *p = NULL; + int r; + + assert(pid > 0); + assert(atime); + + r = get_ctty(pid, NULL, &p); + if (r < 0) + return r; + + return get_tty_atime(p, atime); +} + +int session_get_idle_hint(Session *s, dual_timestamp *t) { + usec_t atime = 0, n; + int r; assert(s); + /* Explicit idle hint is set */ if (s->idle_hint) { if (t) *t = s->idle_hint_timestamp; @@ -743,41 +786,65 @@ int session_get_idle_hint(Session *s, dual_timestamp *t) { return s->idle_hint; } - if (isempty(s->tty)) + /* Graphical sessions should really implement a real + * idle hint logic */ + if (s->display) goto dont_know; - if (s->tty[0] != '/') { - p = strappend("/dev/", s->tty); - if (!p) - return -ENOMEM; - } else - p = NULL; + /* For sessions with an explicitly configured tty, let's check + * its atime */ + if (s->tty) { + r = get_tty_atime(s->tty, &atime); + if (r >= 0) + goto found_atime; + } - if (!startswith(p ? p : s->tty, "/dev/")) { - free(p); - goto dont_know; + /* For sessions with a leader but no explicitly configured + * tty, let's check the controlling tty of the leader */ + if (s->leader > 0) { + r = get_process_ctty_atime(s->leader, &atime); + if (r >= 0) + goto found_atime; } - k = lstat(p ? p : s->tty, &st); - free(p); + /* For other TTY sessions, let's find the most recent atime of + * the ttys of any of the processes of the session */ + if (s->cgroup_path) { + _cleanup_fclose_ FILE *f = NULL; - if (k < 0) - goto dont_know; + if (cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, s->cgroup_path, &f) >= 0) { + pid_t pid; - u = timespec_load(&st.st_atim); - n = now(CLOCK_REALTIME); - b = u + IDLE_THRESHOLD_USEC < n; + atime = 0; + while (cg_read_pid(f, &pid) > 0) { + usec_t a; - if (t) - dual_timestamp_from_realtime(t, u + b*IDLE_THRESHOLD_USEC); + if (get_process_ctty_atime(pid, &a) >= 0) + if (atime == 0 || atime < a) + atime = a; + } - return b; + if (atime != 0) + goto found_atime; + } + } dont_know: if (t) *t = s->idle_hint_timestamp; return 0; + +found_atime: + if (t) + dual_timestamp_from_realtime(t, atime); + + n = now(CLOCK_REALTIME); + + if (s->manager->idle_action_usec <= 0) + return 0; + + return atime + s->manager->idle_action_usec <= n; } void session_set_idle_hint(Session *s, bool b) { @@ -831,7 +898,7 @@ int session_create_fifo(Session *s) { /* Open reading side */ if (s->fifo_fd < 0) { - struct epoll_event ev; + struct epoll_event ev = {}; s->fifo_fd = open(s->fifo_path, O_RDONLY|O_CLOEXEC|O_NDELAY); if (s->fifo_fd < 0) @@ -841,7 +908,6 @@ int session_create_fifo(Session *s) { if (r < 0) return r; - zero(ev); ev.events = 0; ev.data.u32 = FD_OTHER_BASE + s->fifo_fd; @@ -865,6 +931,9 @@ void session_remove_fifo(Session *s) { assert_se(epoll_ctl(s->manager->epoll_fd, EPOLL_CTL_DEL, s->fifo_fd, NULL) == 0); close_nointr_nofail(s->fifo_fd); s->fifo_fd = -1; + + session_save(s); + user_save(s->user); } if (s->fifo_path) { @@ -987,7 +1056,8 @@ DEFINE_STRING_TABLE_LOOKUP(session_type, SessionType); static const char* const session_class_table[_SESSION_CLASS_MAX] = { [SESSION_USER] = "user", [SESSION_GREETER] = "greeter", - [SESSION_LOCK_SCREEN] = "lock-screen" + [SESSION_LOCK_SCREEN] = "lock-screen", + [SESSION_BACKGROUND] = "background" }; DEFINE_STRING_TABLE_LOOKUP(session_class, SessionClass);