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authorLennart Poettering <lennart@poettering.net>2011-06-29 00:06:04 +0200
committerLennart Poettering <lennart@poettering.net>2011-06-29 00:06:04 +0200
commit932e3ee76ea0a9d28902f694ad1873e37532da35 (patch)
tree5e6017ffe793879918dd60bbb7de860fd72054e7
parentfde78a3ac01db57a384e5936bf2c033dcdeae494 (diff)
logind: use named pipes instead of fifos to keep track of sessions so that we can reconnect later
-rw-r--r--src/logind-dbus.c40
-rw-r--r--src/logind-seat.c3
-rw-r--r--src/logind-session.c86
-rw-r--r--src/logind-session.h8
-rw-r--r--src/logind-user.c3
-rw-r--r--src/logind.c17
-rw-r--r--src/logind.h9
7 files changed, 105 insertions, 61 deletions
diff --git a/src/logind-dbus.c b/src/logind-dbus.c
index 5997fb5d7a..ff500f3c6b 100644
--- a/src/logind-dbus.c
+++ b/src/logind-dbus.c
@@ -191,7 +191,7 @@ static int bus_manager_create_session(Manager *m, DBusMessage *message, DBusMess
int r;
char *id = NULL, *p;
uint32_t vtnr = 0;
- int pipe_fds[2] = { -1, -1 };
+ int fifo_fd = -1;
DBusMessage *reply = NULL;
bool b;
@@ -353,6 +353,12 @@ static int bus_manager_create_session(Manager *m, DBusMessage *message, DBusMess
if (session) {
+ fifo_fd = session_create_fifo(session);
+ if (fifo_fd < 0) {
+ r = fifo_fd;
+ goto fail;
+ }
+
/* Session already exists, client is probably
* something like "su" which changes uid but
* is still the same audit session */
@@ -363,15 +369,6 @@ static int bus_manager_create_session(Manager *m, DBusMessage *message, DBusMess
goto fail;
}
- /* Create a throw-away fd */
- if (pipe(pipe_fds) < 0) {
- r = -errno;
- goto fail;
- }
-
- close_nointr_nofail(pipe_fds[0]);
- pipe_fds[0] = -1;
-
p = session_bus_path(session);
if (!p) {
r = -ENOMEM;
@@ -383,7 +380,7 @@ static int bus_manager_create_session(Manager *m, DBusMessage *message, DBusMess
DBUS_TYPE_STRING, &session->id,
DBUS_TYPE_OBJECT_PATH, &p,
DBUS_TYPE_STRING, &session->user->runtime_path,
- DBUS_TYPE_UNIX_FD, &pipe_fds[1],
+ DBUS_TYPE_UNIX_FD, &fifo_fd,
DBUS_TYPE_INVALID);
free(p);
@@ -392,7 +389,7 @@ static int bus_manager_create_session(Manager *m, DBusMessage *message, DBusMess
goto fail;
}
- close_nointr_nofail(pipe_fds[1]);
+ close_nointr_nofail(fifo_fd);
*_reply = reply;
return 0;
@@ -467,16 +464,12 @@ static int bus_manager_create_session(Manager *m, DBusMessage *message, DBusMess
}
}
- if (pipe(pipe_fds) < 0) {
- r = -errno;
+ fifo_fd = session_create_fifo(session);
+ if (fifo_fd < 0) {
+ r = fifo_fd;
goto fail;
}
- r = session_set_pipe_fd(session, pipe_fds[0]);
- if (r < 0)
- goto fail;
- pipe_fds[0] = -1;
-
if (s) {
r = seat_attach_session(s, session);
if (r < 0)
@@ -504,7 +497,7 @@ static int bus_manager_create_session(Manager *m, DBusMessage *message, DBusMess
DBUS_TYPE_STRING, &session->id,
DBUS_TYPE_OBJECT_PATH, &p,
DBUS_TYPE_STRING, &session->user->runtime_path,
- DBUS_TYPE_UNIX_FD, &pipe_fds[1],
+ DBUS_TYPE_UNIX_FD, &fifo_fd,
DBUS_TYPE_INVALID);
free(p);
@@ -513,7 +506,7 @@ static int bus_manager_create_session(Manager *m, DBusMessage *message, DBusMess
goto fail;
}
- close_nointr_nofail(pipe_fds[1]);
+ close_nointr_nofail(fifo_fd);
*_reply = reply;
return 0;
@@ -528,7 +521,8 @@ fail:
if (user)
user_add_to_gc_queue(user);
- close_pipe(pipe_fds);
+ if (fifo_fd >= 0)
+ close_nointr_nofail(fifo_fd);
if (reply)
dbus_message_unref(reply);
@@ -611,7 +605,7 @@ static int attach_device(Manager *m, const char *seat, const char *sysfs) {
const char *p;
p = udev_list_entry_get_name(item);
- if (!startswith(p, sysfs))
+ if (!path_startswith(p, sysfs))
continue;
t = strappend(p, "/uevent");
diff --git a/src/logind-seat.c b/src/logind-seat.c
index 5663aeea4b..1bc0570517 100644
--- a/src/logind-seat.c
+++ b/src/logind-seat.c
@@ -449,6 +449,9 @@ int seat_get_idle_hint(Seat *s, dual_timestamp *t) {
int seat_check_gc(Seat *s) {
assert(s);
+ if (!s->started)
+ return 0;
+
if (seat_is_vtconsole(s))
return 1;
diff --git a/src/logind-session.c b/src/logind-session.c
index d68423bdcf..7671850003 100644
--- a/src/logind-session.c
+++ b/src/logind-session.c
@@ -23,6 +23,7 @@
#include <string.h>
#include <unistd.h>
#include <sys/epoll.h>
+#include <fcntl.h>
#include "logind-session.h"
#include "strv.h"
@@ -56,7 +57,7 @@ Session* session_new(Manager *m, User *u, const char *id) {
}
s->manager = m;
- s->pipe_fd = -1;
+ s->fifo_fd = -1;
s->user = u;
LIST_PREPEND(Session, sessions_by_user, u->sessions, s);
@@ -98,7 +99,7 @@ void session_free(Session *s) {
hashmap_remove(s->manager->sessions, s->id);
- session_unset_pipe_fd(s);
+ session_remove_fifo(s);
free(s->state_file);
free(s);
@@ -149,6 +150,11 @@ int session_save(Session *s) {
"CGROUP=%s\n",
s->cgroup_path);
+ if (s->fifo_path)
+ fprintf(f,
+ "FIFO=%s\n",
+ s->fifo_path);
+
if (s->seat)
fprintf(f,
"SEAT=%s\n",
@@ -229,6 +235,7 @@ int session_load(Session *s) {
"REMOTE", &remote,
"KILL_PROCESSES", &kill_processes,
"CGROUP", &s->cgroup_path,
+ "FIFO", &s->fifo_path,
"SEAT", &seat,
"TTY", &s->tty,
"DISPLAY", &s->display,
@@ -290,6 +297,8 @@ int session_load(Session *s) {
s->type = t;
}
+ session_open_fifo(s);
+
finish:
free(remote);
free(kill_processes);
@@ -746,43 +755,77 @@ void session_set_idle_hint(Session *s, bool b) {
"IdleSinceHintMonotonic\0");
}
-int session_set_pipe_fd(Session *s, int fd) {
+int session_open_fifo(Session *s) {
struct epoll_event ev;
int r;
assert(s);
- assert(fd >= 0);
- assert(s->pipe_fd < 0);
- r = hashmap_put(s->manager->pipe_fds, INT_TO_PTR(fd + 1), s);
+ if (s->fifo_fd >= 0)
+ return 0;
+
+ if (!s->fifo_path)
+ return -EINVAL;
+
+ s->fifo_fd = open(s->fifo_path, O_RDONLY|O_CLOEXEC|O_NDELAY);
+ if (s->fifo_fd < 0)
+ return -errno;
+
+ r = hashmap_put(s->manager->fifo_fds, INT_TO_PTR(s->fifo_fd + 1), s);
if (r < 0)
return r;
zero(ev);
ev.events = 0;
- ev.data.u32 = FD_PIPE_BASE + fd;
+ ev.data.u32 = FD_FIFO_BASE + s->fifo_fd;
- if (epoll_ctl(s->manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) {
- assert_se(hashmap_remove(s->manager->pipe_fds, INT_TO_PTR(fd + 1)) == s);
+ if (epoll_ctl(s->manager->epoll_fd, EPOLL_CTL_ADD, s->fifo_fd, &ev) < 0)
return -errno;
- }
- s->pipe_fd = fd;
return 0;
}
-void session_unset_pipe_fd(Session *s) {
+int session_create_fifo(Session *s) {
+ int r;
+
assert(s);
- if (s->pipe_fd < 0)
- return;
+ if (!s->fifo_path) {
+ if (asprintf(&s->fifo_path, "/run/systemd/sessions/%s.ref", s->id) < 0)
+ return -ENOMEM;
- assert_se(hashmap_remove(s->manager->pipe_fds, INT_TO_PTR(s->pipe_fd + 1)) == s);
+ if (mkfifo(s->fifo_path, 0600) < 0 && errno != EEXIST)
+ return -errno;
+ }
- assert_se(epoll_ctl(s->manager->epoll_fd, EPOLL_CTL_DEL, s->pipe_fd, NULL) == 0);
+ /* Open reading side */
+ r = session_open_fifo(s);
+ if (r < 0)
+ return r;
+
+ /* Open writing side */
+ r = open(s->fifo_path, O_WRONLY|O_CLOEXEC|O_NDELAY);
+ if (r < 0)
+ return -errno;
- close_nointr_nofail(s->pipe_fd);
- s->pipe_fd = -1;
+ return r;
+}
+
+void session_remove_fifo(Session *s) {
+ assert(s);
+
+ if (s->fifo_fd >= 0) {
+ assert_se(hashmap_remove(s->manager->fifo_fds, INT_TO_PTR(s->fifo_fd + 1)) == 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;
+ }
+
+ if (s->fifo_path) {
+ unlink(s->fifo_path);
+ free(s->fifo_path);
+ s->fifo_path = NULL;
+ }
}
int session_check_gc(Session *s) {
@@ -790,9 +833,12 @@ int session_check_gc(Session *s) {
assert(s);
- if (s->pipe_fd >= 0) {
+ if (!s->started)
+ return 0;
+
+ if (s->fifo_fd >= 0) {
- r = pipe_eof(s->pipe_fd);
+ r = pipe_eof(s->fifo_fd);
if (r < 0)
return r;
diff --git a/src/logind-session.h b/src/logind-session.h
index 72f85caaaf..d0cf0ed886 100644
--- a/src/logind-session.h
+++ b/src/logind-session.h
@@ -65,7 +65,8 @@ struct Session {
pid_t leader;
uint32_t audit_id;
- int pipe_fd;
+ int fifo_fd;
+ char *fifo_path;
char *cgroup_path;
char **controllers, **reset_controllers;
@@ -91,8 +92,9 @@ int session_activate(Session *s);
bool session_is_active(Session *s);
int session_get_idle_hint(Session *s, dual_timestamp *t);
void session_set_idle_hint(Session *s, bool b);
-int session_set_pipe_fd(Session *s, int fd);
-void session_unset_pipe_fd(Session *s);
+int session_open_fifo(Session *s);
+int session_create_fifo(Session *s);
+void session_remove_fifo(Session *s);
int session_start(Session *s);
int session_stop(Session *s);
int session_save(Session *s);
diff --git a/src/logind-user.c b/src/logind-user.c
index 177e88200a..4335bf6462 100644
--- a/src/logind-user.c
+++ b/src/logind-user.c
@@ -459,6 +459,9 @@ int user_check_gc(User *u) {
assert(u);
+ if (!u->started)
+ return 0;
+
if (u->sessions)
return 1;
diff --git a/src/logind.c b/src/logind.c
index a0a89c0689..d38d7d51c3 100644
--- a/src/logind.c
+++ b/src/logind.c
@@ -52,7 +52,7 @@ Manager *manager_new(void) {
m->sessions = hashmap_new(string_hash_func, string_compare_func);
m->users = hashmap_new(trivial_hash_func, trivial_compare_func);
m->cgroups = hashmap_new(string_hash_func, string_compare_func);
- m->pipe_fds = hashmap_new(trivial_hash_func, trivial_compare_func);
+ m->fifo_fds = hashmap_new(trivial_hash_func, trivial_compare_func);
if (!m->devices || !m->seats || !m->sessions || !m->users) {
manager_free(m);
@@ -98,7 +98,7 @@ void manager_free(Manager *m) {
hashmap_free(m->devices);
hashmap_free(m->seats);
hashmap_free(m->cgroups);
- hashmap_free(m->pipe_fds);
+ hashmap_free(m->fifo_fds);
if (m->console_active_fd >= 0)
close_nointr_nofail(m->console_active_fd);
@@ -802,9 +802,9 @@ static void manager_pipe_notify_eof(Manager *m, int fd) {
assert_se(m);
assert_se(fd >= 0);
- assert_se(s = hashmap_get(m->pipe_fds, INT_TO_PTR(fd + 1)));
- assert(s->pipe_fd == fd);
- session_unset_pipe_fd(s);
+ assert_se(s = hashmap_get(m->fifo_fds, INT_TO_PTR(fd + 1)));
+ assert(s->fifo_fd == fd);
+ session_remove_fifo(s);
session_stop(s);
}
@@ -1081,9 +1081,6 @@ int manager_startup(Manager *m) {
manager_enumerate_users(m);
manager_enumerate_sessions(m);
- /* Get rid of objects that are no longer used */
- manager_gc(m);
-
/* And start everything */
HASHMAP_FOREACH(seat, m->seats, i)
seat_start(seat);
@@ -1139,8 +1136,8 @@ int manager_run(Manager *m) {
break;
default:
- if (event.data.u32 >= FD_PIPE_BASE)
- manager_pipe_notify_eof(m, event.data.u32 - FD_PIPE_BASE);
+ if (event.data.u32 >= FD_FIFO_BASE)
+ manager_pipe_notify_eof(m, event.data.u32 - FD_FIFO_BASE);
}
}
diff --git a/src/logind.h b/src/logind.h
index 309541415d..9b9f38bb80 100644
--- a/src/logind.h
+++ b/src/logind.h
@@ -37,15 +37,14 @@
* spawn user systemd
* direct client API
* add configuration file
- * D-Bus method: AttachDevices(seat, devices[]);
- * use named pipes to detect when a session dies
* verify access to SetIdleHint
+ *
+ * udev:
* drop redundant udev_device_get_is_initialized() use as soon as libudev is fixed
* properly escape/remove : and . from seat names in udev rules
* use device_has_tag() as soon as it is available
* trigger based on libudev if available
* enumerate recursively with libudev when triggering
- * make sure IMPORT{parent}="ID_SEAT" works between usb hub and sound card
*
* non-local X11 server
* reboot/shutdown halt management
@@ -94,7 +93,7 @@ struct Manager {
unsigned long session_counter;
Hashmap *cgroups;
- Hashmap *pipe_fds;
+ Hashmap *fifo_fds;
};
enum {
@@ -102,7 +101,7 @@ enum {
FD_VCSA_UDEV,
FD_CONSOLE,
FD_BUS,
- FD_PIPE_BASE
+ FD_FIFO_BASE
};
Manager *manager_new(void);