X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Flogin%2Flogind-session.c;h=1a5c76b815f4811a12e995fe89778a6e1fed4c3f;hp=eeb58c9031b71d1bce41805cb778e6d4c7890d30;hb=b79f7282da05915ac86a02e460cccad41f7b7d0c;hpb=d5099efc47d4e6ac60816b5381a5f607ab03f06e

diff --git a/src/login/logind-session.c b/src/login/logind-session.c
index eeb58c903..1a5c76b81 100644
--- a/src/login/logind-session.c
+++ b/src/login/logind-session.c
@@ -28,9 +28,7 @@
 #include <sys/ioctl.h>
 #include <unistd.h>
 
-#include "sd-id128.h"
 #include "sd-messages.h"
-#include "strv.h"
 #include "util.h"
 #include "mkdir.h"
 #include "path-util.h"
@@ -39,6 +37,8 @@
 #include "bus-util.h"
 #include "bus-error.h"
 #include "logind-session.h"
+#include "formats-util.h"
+#include "terminal-util.h"
 
 #define RELEASE_USEC (20*USEC_PER_SEC)
 
@@ -264,7 +264,7 @@ int session_save(Session *s) {
                 fprintf(f, "VTNR=%u\n", s->vtnr);
 
         if (!s->vtnr)
-                fprintf(f, "POS=%u\n", s->pos);
+                fprintf(f, "POSITION=%u\n", s->position);
 
         if (s->leader > 0)
                 fprintf(f, "LEADER="PID_FMT"\n", s->leader);
@@ -292,7 +292,7 @@ int session_save(Session *s) {
 
 finish:
         if (r < 0)
-                log_error("Failed to save session data %s: %s", s->state_file, strerror(-r));
+                log_error_errno(r, "Failed to save session data %s: %m", s->state_file);
 
         return r;
 }
@@ -301,7 +301,8 @@ int session_load(Session *s) {
         _cleanup_free_ char *remote = NULL,
                 *seat = NULL,
                 *vtnr = NULL,
-                *pos = NULL,
+                *state = NULL,
+                *position = NULL,
                 *leader = NULL,
                 *type = NULL,
                 *class = NULL,
@@ -327,7 +328,8 @@ int session_load(Session *s) {
                            "SERVICE",        &s->service,
                            "DESKTOP",        &s->desktop,
                            "VTNR",           &vtnr,
-                           "POS",            &pos,
+                           "STATE",          &state,
+                           "POSITION",       &position,
                            "LEADER",         &leader,
                            "TYPE",           &type,
                            "CLASS",          &class,
@@ -337,10 +339,8 @@ int session_load(Session *s) {
                            "CONTROLLER",     &controller,
                            NULL);
 
-        if (r < 0) {
-                log_error("Failed to read %s: %s", s->state_file, strerror(-r));
-                return r;
-        }
+        if (r < 0)
+                return log_error_errno(r, "Failed to read %s: %m", s->state_file);
 
         if (!s->user) {
                 uid_t u;
@@ -357,7 +357,7 @@ int session_load(Session *s) {
                         return r;
                 }
 
-                user = hashmap_get(s->manager->users, ULONG_TO_PTR((unsigned long) u));
+                user = hashmap_get(s->manager->users, UID_TO_PTR(u));
                 if (!user) {
                         log_error("User of session %s not known.", s->id);
                         return -ENOENT;
@@ -388,10 +388,10 @@ int session_load(Session *s) {
         if (!s->seat || !seat_has_vts(s->seat))
                 s->vtnr = 0;
 
-        if (pos && s->seat) {
+        if (position && s->seat) {
                 unsigned int npos;
 
-                safe_atou(pos, &npos);
+                safe_atou(position, &npos);
                 seat_claim_position(s->seat, s, npos);
         }
 
@@ -417,13 +417,18 @@ int session_load(Session *s) {
                         s->class = c;
         }
 
+        if (state && streq(state, "closing"))
+                s->stopping = true;
+
         if (s->fifo_path) {
                 int fd;
 
                 /* If we open an unopened pipe for reading we will not
                    get an EOF. to trigger an EOF we hence open it for
-                   reading, but close it right-away which then will
-                   trigger the EOF. */
+                   writing, but close it right away which then will
+                   trigger the EOF. This will happen immediately if no
+                   other process has the FIFO open for writing, i. e.
+                   when the session died before logind (re)started. */
 
                 fd = session_create_fifo(s);
                 safe_close(fd);
@@ -458,7 +463,7 @@ int session_activate(Session *s) {
         assert(s->user);
 
         if (!s->seat)
-                return -ENOTSUP;
+                return -EOPNOTSUPP;
 
         if (s->seat->active == s)
                 return 0;
@@ -466,7 +471,7 @@ int session_activate(Session *s) {
         /* on seats with VTs, we let VTs manage session-switching */
         if (seat_has_vts(s->seat)) {
                 if (!s->vtnr)
-                        return -ENOTSUP;
+                        return -EOPNOTSUPP;
 
                 return chvt(s->vtnr);
         }
@@ -549,11 +554,11 @@ int session_start(Session *s) {
                 return r;
 
         log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO,
-                   MESSAGE_ID(SD_MESSAGE_SESSION_START),
+                   LOG_MESSAGE_ID(SD_MESSAGE_SESSION_START),
                    "SESSION_ID=%s", s->id,
                    "USER_ID=%s", s->user->name,
                    "LEADER="PID_FMT, s->leader,
-                   "MESSAGE=New session %s of user %s.", s->id, s->user->name,
+                   LOG_MESSAGE("New session %s of user %s.", s->id, s->user->name),
                    NULL);
 
         if (!dual_timestamp_is_set(&s->timestamp))
@@ -625,6 +630,9 @@ int session_stop(Session *s, bool force) {
 
         s->timer_event_source = sd_event_source_unref(s->timer_event_source);
 
+        if (s->seat)
+                seat_evict_position(s->seat, s);
+
         /* We are going down, don't care about FIFOs anymore */
         session_remove_fifo(s);
 
@@ -652,15 +660,18 @@ int session_finalize(Session *s) {
 
         if (s->started)
                 log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO,
-                           MESSAGE_ID(SD_MESSAGE_SESSION_STOP),
+                           LOG_MESSAGE_ID(SD_MESSAGE_SESSION_STOP),
                            "SESSION_ID=%s", s->id,
                            "USER_ID=%s", s->user->name,
                            "LEADER="PID_FMT, s->leader,
-                           "MESSAGE=Removed session %s.", s->id,
+                           LOG_MESSAGE("Removed session %s.", s->id),
                            NULL);
 
         s->timer_event_source = sd_event_source_unref(s->timer_event_source);
 
+        if (s->seat)
+                seat_evict_position(s->seat, s);
+
         /* Kill session devices */
         while ((sd = hashmap_first(s->devices)))
                 session_device_free(sd);
@@ -698,18 +709,20 @@ static int release_timeout_callback(sd_event_source *es, uint64_t usec, void *us
         return 0;
 }
 
-void session_release(Session *s) {
+int session_release(Session *s) {
         assert(s);
 
         if (!s->started || s->stopping)
-                return;
+                return 0;
+
+        if (s->timer_event_source)
+                return 0;
 
-        if (!s->timer_event_source)
-                sd_event_add_time(s->manager->event,
-                                  &s->timer_event_source,
-                                  CLOCK_MONOTONIC,
-                                  now(CLOCK_MONOTONIC) + RELEASE_USEC, 0,
-                                  release_timeout_callback, s);
+        return sd_event_add_time(s->manager->event,
+                                 &s->timer_event_source,
+                                 CLOCK_MONOTONIC,
+                                 now(CLOCK_MONOTONIC) + RELEASE_USEC, 0,
+                                 release_timeout_callback, s);
 }
 
 bool session_is_active(Session *s) {
@@ -968,11 +981,9 @@ static int session_open_vt(Session *s) {
                 return s->vtfd;
 
         sprintf(path, "/dev/tty%u", s->vtnr);
-        s->vtfd = open(path, O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY);
-        if (s->vtfd < 0) {
-                log_error("cannot open VT %s of session %s: %m", path, s->id);
-                return -errno;
-        }
+        s->vtfd = open_terminal(path, O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY);
+        if (s->vtfd < 0)
+                return log_error_errno(errno, "cannot open VT %s of session %s: %m", path, s->id);
 
         return s->vtfd;
 }
@@ -991,21 +1002,21 @@ int session_prepare_vt(Session *s) {
         r = fchown(vt, s->user->uid, -1);
         if (r < 0) {
                 r = -errno;
-                log_error("Cannot change owner of /dev/tty%u: %m", s->vtnr);
+                log_error_errno(errno, "Cannot change owner of /dev/tty%u: %m", s->vtnr);
                 goto error;
         }
 
         r = ioctl(vt, KDSKBMODE, K_OFF);
         if (r < 0) {
                 r = -errno;
-                log_error("Cannot set K_OFF on /dev/tty%u: %m", s->vtnr);
+                log_error_errno(errno, "Cannot set K_OFF on /dev/tty%u: %m", s->vtnr);
                 goto error;
         }
 
         r = ioctl(vt, KDSETMODE, KD_GRAPHICS);
         if (r < 0) {
                 r = -errno;
-                log_error("Cannot set KD_GRAPHICS on /dev/tty%u: %m", s->vtnr);
+                log_error_errno(errno, "Cannot set KD_GRAPHICS on /dev/tty%u: %m", s->vtnr);
                 goto error;
         }
 
@@ -1018,7 +1029,7 @@ int session_prepare_vt(Session *s) {
         r = ioctl(vt, VT_SETMODE, &mode);
         if (r < 0) {
                 r = -errno;
-                log_error("Cannot set VT_PROCESS on /dev/tty%u: %m", s->vtnr);
+                log_error_errno(errno, "Cannot set VT_PROCESS on /dev/tty%u: %m", s->vtnr);
                 goto error;
         }
 
@@ -1034,25 +1045,61 @@ void session_restore_vt(Session *s) {
         int vt, kb = K_XLATE;
         struct vt_mode mode = { 0 };
 
+        /* We need to get a fresh handle to the virtual terminal,
+         * since the old file-descriptor is potentially in a hung-up
+         * state after the controlling process exited; we do a
+         * little dance to avoid having the terminal be available
+         * for reuse before we've cleaned it up.
+         */
+        int old_fd = s->vtfd;
+        s->vtfd = -1;
+
         vt = session_open_vt(s);
+        safe_close(old_fd);
+
         if (vt < 0)
                 return;
 
-        ioctl(vt, KDSETMODE, KD_TEXT);
+        (void) ioctl(vt, KDSETMODE, KD_TEXT);
 
         if (read_one_line_file("/sys/module/vt/parameters/default_utf8", &utf8) >= 0 && *utf8 == '1')
                 kb = K_UNICODE;
 
-        ioctl(vt, KDSKBMODE, kb);
+        (void) ioctl(vt, KDSKBMODE, kb);
 
         mode.mode = VT_AUTO;
-        ioctl(vt, VT_SETMODE, &mode);
+        (void) ioctl(vt, VT_SETMODE, &mode);
 
         fchown(vt, 0, -1);
 
         s->vtfd = safe_close(s->vtfd);
 }
 
+void session_leave_vt(Session *s) {
+        int r;
+
+        assert(s);
+
+        /* This is called whenever we get a VT-switch signal from the kernel.
+         * We acknowledge all of them unconditionally. Note that session are
+         * free to overwrite those handlers and we only register them for
+         * sessions with controllers. Legacy sessions are not affected.
+         * However, if we switch from a non-legacy to a legacy session, we must
+         * make sure to pause all device before acknowledging the switch. We
+         * process the real switch only after we are notified via sysfs, so the
+         * legacy session might have already started using the devices. If we
+         * don't pause the devices before the switch, we might confuse the
+         * session we switch to. */
+
+        if (s->vtfd < 0)
+                return;
+
+        session_device_pause_all(s);
+        r = ioctl(s->vtfd, VT_RELDISP, 1);
+        if (r < 0)
+                log_debug_errno(errno, "Cannot release VT of session %s: %m", s->id);
+}
+
 bool session_is_controller(Session *s, const char *sender) {
         assert(s);