/*-*- Mode: C; c-basic-offset: 8 -*-*/
+/***
+ This file is part of systemd.
+
+ Copyright 2010 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
#include <errno.h>
+#include <sys/epoll.h>
#include <libudev.h>
#include "unit.h"
#include "strv.h"
#include "log.h"
+static const UnitActiveState state_translation_table[_DEVICE_STATE_MAX] = {
+ [DEVICE_DEAD] = UNIT_INACTIVE,
+ [DEVICE_AVAILABLE] = UNIT_ACTIVE
+};
+
+static const char* const state_string_table[_DEVICE_STATE_MAX] = {
+ [DEVICE_DEAD] = "dead",
+ [DEVICE_AVAILABLE] = "available"
+};
+
static void device_done(Unit *u) {
Device *d = DEVICE(u);
assert(d);
+
free(d->sysfs);
+ d->sysfs = NULL;
}
-static void device_dump(Unit *u, FILE *f, const char *prefix) {
+static void device_init(Unit *u) {
+ Device *d = DEVICE(u);
- static const char* const state_table[_DEVICE_STATE_MAX] = {
- [DEVICE_DEAD] = "dead",
- [DEVICE_AVAILABLE] = "available"
- };
+ assert(d);
+ assert(u->meta.load_state == UNIT_STUB);
+
+ d->state = 0;
+}
+static void device_set_state(Device *d, DeviceState state) {
+ DeviceState old_state;
+ assert(d);
+
+ old_state = d->state;
+ d->state = state;
+
+ if (state != old_state)
+ log_debug("%s changed %s → %s", unit_id(UNIT(d)), state_string_table[old_state], state_string_table[state]);
+
+ unit_notify(UNIT(d), state_translation_table[old_state], state_translation_table[state]);
+}
+
+static int device_coldplug(Unit *u) {
+ Device *d = DEVICE(u);
+
+ assert(d);
+ assert(d->state == DEVICE_DEAD);
+
+ if (d->sysfs)
+ device_set_state(d, DEVICE_AVAILABLE);
+
+ return 0;
+}
+
+static void device_dump(Unit *u, FILE *f, const char *prefix) {
Device *d = DEVICE(u);
assert(d);
fprintf(f,
"%sDevice State: %s\n"
"%sSysfs Path: %s\n",
- prefix, state_table[d->state],
- prefix, d->sysfs);
+ prefix, state_string_table[d->state],
+ prefix, strna(d->sysfs));
}
-static int device_add_escaped_name(Unit *u, const char *dn) {
+static UnitActiveState device_active_state(Unit *u) {
+ assert(u);
+
+ return state_translation_table[DEVICE(u)->state];
+}
+
+static int device_add_escaped_name(Unit *u, const char *dn, bool make_id) {
char *e;
int r;
return -ENOMEM;
r = unit_add_name(u, e);
+
+ if (r >= 0 && make_id)
+ unit_choose_id(u, e);
+
free(e);
if (r < 0 && r != -EEXIST)
return 0;
}
-static int device_process_device(Manager *m, struct udev_device *dev) {
- const char *dn, *names, *wants, *sysfs;
+static int device_find_escape_name(Manager *m, const char *dn, Unit **_u) {
+ char *e;
+ Unit *u;
+
+ assert(m);
+ assert(dn);
+ assert(dn[0] == '/');
+ assert(_u);
+
+ if (!(e = unit_name_escape_path(dn+1, ".device")))
+ return -ENOMEM;
+
+ u = manager_get_unit(m, e);
+ free(e);
+
+ if (u) {
+ *_u = u;
+ return 1;
+ }
+
+ return 0;
+}
+
+static bool devnode_is_api(const char *node) {
+ unsigned i;
+
+ static const char * const table[] = {
+ "/dev/null",
+ "/dev/zero",
+ "/dev/urandom",
+ "/dev/random",
+ "/dev/port",
+ "/dev/oldmem",
+ "/dev/full",
+ "/dev/kmsg",
+ "/dev/mem"
+ };
+
+ for (i = 0; i < ELEMENTSOF(table); i++)
+ if (streq(table[i], node))
+ return true;
+
+ return false;
+}
+
+static int device_process_new_device(Manager *m, struct udev_device *dev, bool update_state) {
+ const char *dn, *names, *wants, *sysfs, *expose, *model;
Unit *u = NULL;
int r;
- char *e, *w, *state;
+ char *w, *state;
size_t l;
bool delete;
struct udev_list_entry *item = NULL, *first = NULL;
assert(m);
+ if (!(sysfs = udev_device_get_syspath(dev)))
+ return -ENOMEM;
+
/* Check whether this entry is even relevant for us. */
dn = udev_device_get_devnode(dev);
+ expose = udev_device_get_property_value(dev, "SYSTEMD_EXPOSE");
names = udev_device_get_property_value(dev, "SYSTEMD_NAMES");
wants = udev_device_get_property_value(dev, "SYSTEMD_WANTS");
- if (!dn && !names && !wants)
- return 0;
+ if (expose) {
+ int b;
+
+ if ((b = parse_boolean(expose)) < 0) {
+ log_error("Failed to parse SYSTEMD_EXPOSE udev property for device %s: %s", sysfs, expose);
+ return 0;
+ }
+
+ if (!b)
+ return 0;
+ } else
+ if ((!dn || devnode_is_api(dn)) && !names && !wants)
+ return 0;
/* Ok, seems kinda interesting. Now, let's see if this one
* already exists. */
- if (!(sysfs = udev_device_get_syspath(dev)))
- return -ENOMEM;
+ if ((r = device_find_escape_name(m, sysfs, &u)) < 0)
+ return r;
- assert(sysfs[0] == '/');
- if (!(e = unit_name_escape_path(sysfs+1, ".device")))
- return -ENOMEM;
+ if (r == 0 && dn)
+ if ((r = device_find_escape_name(m, dn, &u)) < 0)
+ return r;
- if (!(u = manager_get_unit(m, e))) {
- const char *model;
+ if (r == 0) {
+ first = udev_device_get_devlinks_list_entry(dev);
+ udev_list_entry_foreach(item, first) {
+ if ((r = device_find_escape_name(m, udev_list_entry_get_name(item), &u)) < 0)
+ return r;
+ if (r > 0)
+ break;
+ }
+ }
+
+ /* FIXME: this needs proper merging */
+
+ assert((r > 0) == !!u);
+
+ /* If this is a different unit, then let's not merge things */
+ if (u && DEVICE(u)->sysfs && !streq(DEVICE(u)->sysfs, sysfs))
+ u = NULL;
+
+ if (!u) {
delete = true;
- if (!(u = unit_new(m))) {
- free(e);
+ if (!(u = unit_new(m)))
return -ENOMEM;
- }
- r = unit_add_name(u, e);
- free(e);
-
- if (r < 0)
+ if ((r = device_add_escaped_name(u, sysfs, true)) < 0)
goto fail;
+ unit_add_to_load_queue(u);
+ } else
+ delete = false;
+
+ if (!(DEVICE(u)->sysfs))
if (!(DEVICE(u)->sysfs = strdup(sysfs))) {
r = -ENOMEM;
goto fail;
}
- if ((model = udev_device_get_property_value(dev, "ID_MODEL_FROM_DATABASE")) ||
- (model = udev_device_get_property_value(dev, "ID_MODEL")))
- if (!(u->meta.description = strdup(model))) {
- r = -ENOMEM;
- goto fail;
- }
-
- } else {
- delete = false;
- free(e);
- }
-
if (dn)
- if ((r = device_add_escaped_name(u, dn)) < 0)
+ if ((r = device_add_escaped_name(u, dn, true)) < 0)
goto fail;
first = udev_device_get_devlinks_list_entry(dev);
udev_list_entry_foreach(item, first)
- if ((r = device_add_escaped_name(u, udev_list_entry_get_name(item))) < 0)
+ if ((r = device_add_escaped_name(u, udev_list_entry_get_name(item), false)) < 0)
goto fail;
+ if ((model = udev_device_get_property_value(dev, "ID_MODEL_FROM_DATABASE")) ||
+ (model = udev_device_get_property_value(dev, "ID_MODEL"))) {
+ if ((r = unit_set_description(u, model)) < 0)
+ goto fail;
+ } else if (dn)
+ if ((r = unit_set_description(u, dn)) < 0)
+ goto fail;
+
+ /* We don't remove names that are gone. But that should be
+ * fine and should probably be fixed only on a configuration
+ * refresh. */
+
if (names) {
FOREACH_WORD(w, l, names, state) {
- if (!(e = strndup(w, l)))
+ char *e;
+
+ if (!(e = strndup(w, l))) {
+ r = -ENOMEM;
goto fail;
+ }
r = unit_add_name(u, e);
free(e);
}
}
-
- if (set_isempty(u->meta.names)) {
- r = -EEXIST;
- goto fail;
- }
-
if (wants) {
FOREACH_WORD(w, l, wants, state) {
- if (!(e = strndup(w, l)))
+ char *e;
+
+ if (!(e = strndup(w, l))) {
+ r = -ENOMEM;
goto fail;
+ }
r = unit_add_dependency_by_name(u, UNIT_WANTS, e);
free(e);
}
}
- unit_add_to_load_queue(u);
+ if (update_state) {
+ manager_dispatch_load_queue(u->meta.manager);
+ device_set_state(DEVICE(u), DEVICE_AVAILABLE);
+ }
+
+ unit_add_to_dbus_queue(u);
+
return 0;
fail:
return r;
}
-static int device_process_path(Manager *m, const char *path) {
+static int device_process_path(Manager *m, const char *path, bool update_state) {
int r;
struct udev_device *dev;
return -ENOMEM;
}
- r = device_process_device(m, dev);
+ r = device_process_new_device(m, dev, update_state);
udev_device_unref(dev);
return r;
}
+static int device_process_removed_device(Manager *m, struct udev_device *dev) {
+ const char *sysfs;
+ char *e;
+ Unit *u;
+ Device *d;
+
+ assert(m);
+ assert(dev);
+
+ if (!(sysfs = udev_device_get_syspath(dev)))
+ return -ENOMEM;
+
+ assert(sysfs[0] == '/');
+ if (!(e = unit_name_escape_path(sysfs+1, ".device")))
+ return -ENOMEM;
+
+ u = manager_get_unit(m, e);
+ free(e);
+
+ if (!u)
+ return 0;
+
+ d = DEVICE(u);
+ free(d->sysfs);
+ d->sysfs = NULL;
+
+ device_set_state(d, DEVICE_DEAD);
+ return 0;
+}
+
static void device_shutdown(Manager *m) {
assert(m);
+ if (m->udev_monitor)
+ udev_monitor_unref(m->udev_monitor);
+
if (m->udev)
udev_unref(m->udev);
}
static int device_enumerate(Manager *m) {
+ struct epoll_event ev;
int r;
struct udev_enumerate *e = NULL;
struct udev_list_entry *item = NULL, *first = NULL;
if (!(m->udev = udev_new()))
return -ENOMEM;
+ if (!(m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev"))) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ if (udev_monitor_enable_receiving(m->udev_monitor) < 0) {
+ r = -EIO;
+ goto fail;
+ }
+
+ m->udev_watch.type = WATCH_UDEV;
+ m->udev_watch.fd = udev_monitor_get_fd(m->udev_monitor);
+
+ zero(ev);
+ ev.events = EPOLLIN;
+ ev.data.ptr = &m->udev_watch;
+
+ if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_watch.fd, &ev) < 0)
+ return -errno;
+
if (!(e = udev_enumerate_new(m->udev))) {
r = -ENOMEM;
goto fail;
first = udev_enumerate_get_list_entry(e);
udev_list_entry_foreach(item, first)
- device_process_path(m, udev_list_entry_get_name(item));
+ device_process_path(m, udev_list_entry_get_name(item), false);
udev_enumerate_unref(e);
-
return 0;
fail:
return r;
}
-static UnitActiveState device_active_state(Unit *u) {
- return DEVICE(u)->state == DEVICE_DEAD ? UNIT_INACTIVE : UNIT_ACTIVE;
+void device_fd_event(Manager *m, int events) {
+ struct udev_device *dev;
+ int r;
+ const char *action;
+
+ assert(m);
+ assert(events == EPOLLIN);
+
+ if (!(dev = udev_monitor_receive_device(m->udev_monitor))) {
+ log_error("Failed to receive device.");
+ return;
+ }
+
+ if (!(action = udev_device_get_action(dev))) {
+ log_error("Failed to get udev action string.");
+ goto fail;
+ }
+
+ if (streq(action, "remove")) {
+ if ((r = device_process_removed_device(m, dev)) < 0) {
+ log_error("Failed to process udev device event: %s", strerror(-r));
+ goto fail;
+ }
+ } else {
+ if ((r = device_process_new_device(m, dev, true)) < 0) {
+ log_error("Failed to process udev device event: %s", strerror(-r));
+ goto fail;
+ }
+ }
+
+fail:
+ udev_device_unref(dev);
}
const UnitVTable device_vtable = {
.suffix = ".device",
- .init = unit_load_fragment_and_dropin,
+ .init = device_init,
+ .load = unit_load_fragment_and_dropin_optional,
.done = device_done,
+ .coldplug = device_coldplug,
+
.dump = device_dump,
- .enumerate = device_enumerate,
- .shutdown = device_shutdown,
+ .active_state = device_active_state,
- .active_state = device_active_state
+ .enumerate = device_enumerate,
+ .shutdown = device_shutdown
};
~ianmdlvl / elogind.git / blobdiff