[people/ms/systemd.git] / device.c

/*-*- 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 "device.h"
#include "strv.h"
#include "log.h"
#include "unit-name.h"
#include "dbus-device.h"

static const UnitActiveState state_translation_table[_DEVICE_STATE_MAX] = {
        [DEVICE_DEAD] = UNIT_INACTIVE,
        [DEVICE_AVAILABLE] = UNIT_ACTIVE
};

static void device_done(Unit *u) {
        Device *d = DEVICE(u);

        assert(d);

        free(d->sysfs);
        d->sysfs = NULL;
}

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(d)->meta.id,
                          device_state_to_string(old_state),
                          device_state_to_string(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, device_state_to_string(d->state),
                prefix, strna(d->sysfs));
}

static UnitActiveState device_active_state(Unit *u) {
        assert(u);

        return state_translation_table[DEVICE(u)->state];
}

static const char *device_sub_state_to_string(Unit *u) {
        assert(u);

        return device_state_to_string(DEVICE(u)->state);
}

static int device_add_escaped_name(Unit *u, const char *dn, bool make_id) {
        char *e;
        int r;

        assert(u);
        assert(dn);
        assert(dn[0] == '/');

        if (!(e = unit_name_from_path(dn, ".device")))
                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 r;

        return 0;
}

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_from_path(dn, ".device")))
                return -ENOMEM;

        u = manager_get_unit(m, e);
        free(e);

        if (u) {
                *_u = u;
                return 1;
        }

        return 0;
}

static int device_process_new_device(Manager *m, struct udev_device *dev, bool update_state) {
        const char *dn, *wants, *sysfs, *expose, *model;
        Unit *u = NULL;
        int r;
        char *w, *state;
        size_t l;
        bool delete;
        struct udev_list_entry *item = NULL, *first = NULL;
        int b;

        assert(m);

        if (!(sysfs = udev_device_get_syspath(dev)))
                return -ENOMEM;

        if (!(expose = udev_device_get_property_value(dev, "SYSTEMD_EXPOSE")))
                return 0;

        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;

        /* Check whether this entry is even relevant for us. */
        dn = udev_device_get_devnode(dev);
        wants = udev_device_get_property_value(dev, "SYSTEMD_WANTS");

        if ((r = device_find_escape_name(m, sysfs, &u)) < 0)
                return r;

        if (r == 0 && dn)
                if ((r = device_find_escape_name(m, dn, &u)) < 0)
                        return r;

        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)))
                        return -ENOMEM;

                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 (dn)
                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), 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;

        if (wants) {
                FOREACH_WORD(w, l, wants, state) {
                        char *e;

                        if (!(e = strndup(w, l))) {
                                r = -ENOMEM;
                                goto fail;
                        }

                        r = unit_add_dependency_by_name(u, UNIT_WANTS, NULL, e, true);
                        free(e);

                        if (r < 0)
                                goto fail;
                }
        }

        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:
        if (delete && u)
                unit_free(u);
        return r;
}

static int device_process_path(Manager *m, const char *path, bool update_state) {
        int r;
        struct udev_device *dev;

        assert(m);
        assert(path);

        if (!(dev = udev_device_new_from_syspath(m->udev, path))) {
                log_warning("Failed to get udev device object from udev for path %s.", path);
                return -ENOMEM;
        }

        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_from_path(sysfs, ".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);
                m->udev_monitor = NULL;
        }

        if (m->udev) {
                udev_unref(m->udev);
                m->udev = NULL;
        }
}

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;

        assert(m);

        if (!m->udev) {
                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;
        }

        if (udev_enumerate_scan_devices(e) < 0) {
                r = -EIO;
                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), false);

        udev_enumerate_unref(e);
        return 0;

fail:
        if (e)
                udev_enumerate_unref(e);

        device_shutdown(m);
        return r;
}

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);
}

static const char* const device_state_table[_DEVICE_STATE_MAX] = {
        [DEVICE_DEAD] = "dead",
        [DEVICE_AVAILABLE] = "available"
};

DEFINE_STRING_TABLE_LOOKUP(device_state, DeviceState);

const UnitVTable device_vtable = {
        .suffix = ".device",

        .no_requires = true,
        .no_instances = true,
        .no_snapshots = true,
        .no_isolate = true,

        .load = unit_load_fragment_and_dropin_optional,
        .done = device_done,
        .coldplug = device_coldplug,

        .dump = device_dump,

        .active_state = device_active_state,
        .sub_state_to_string = device_sub_state_to_string,

        .bus_message_handler = bus_device_message_handler,

        .enumerate = device_enumerate,
        .shutdown = device_shutdown
};
Commit	Line	Data
5cb5a6ff LP	1	/-- Mode: C; c-basic-offset: 8 --/
5cb5a6ff LP	2
a7334b09 LP	3	/***
	4	This file is part of systemd.
	5
	6	Copyright 2010 Lennart Poettering
	7
	8	systemd is free software; you can redistribute it and/or modify it
	9	under the terms of the GNU General Public License as published by
	10	the Free Software Foundation; either version 2 of the License, or
	11	(at your option) any later version.
	12
	13	systemd is distributed in the hope that it will be useful, but
	14	WITHOUT ANY WARRANTY; without even the implied warranty of
	15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	General Public License for more details.
	17
	18	You should have received a copy of the GNU General Public License
	19	along with systemd; If not, see <http://www.gnu.org/licenses/>.
	20	***/
	21
25ac040b	22	#include <errno.h>
f94ea366	23	#include <sys/epoll.h>
25ac040b LP	24	#include <libudev.h>
25ac040b LP	25
87f0e418	26	#include "unit.h"
5cb5a6ff LP	27	#include "device.h"
5cb5a6ff LP	28	#include "strv.h"
25ac040b	29	#include "log.h"
9e2f7c11	30	#include "unit-name.h"
4139c1b2	31	#include "dbus-device.h"
5cb5a6ff	32
f50e0a01 LP	33	static const UnitActiveState state_translation_table[_DEVICE_STATE_MAX] = {
	34	[DEVICE_DEAD] = UNIT_INACTIVE,
	35	[DEVICE_AVAILABLE] = UNIT_ACTIVE
	36	};
	37
87f0e418 LP	38	static void device_done(Unit *u) {
87f0e418 LP	39	Device *d = DEVICE(u);
034c6ed7 LP	40
034c6ed7 LP	41	assert(d);
e537352b	42
25ac040b	43	free(d->sysfs);
e537352b LP	44	d->sysfs = NULL;
	45	}
	46
f50e0a01 LP	47	static void device_set_state(Device *d, DeviceState state) {
	48	DeviceState old_state;
	49	assert(d);
5cb5a6ff	50
f50e0a01 LP	51	old_state = d->state;
f50e0a01 LP	52	d->state = state;
5cb5a6ff	53
e537352b	54	if (state != old_state)
40d50879	55	log_debug("%s changed %s -> %s",
a16e1123 LP	56	UNIT(d)->meta.id,
	57	device_state_to_string(old_state),
	58	device_state_to_string(state));
f50e0a01 LP	59
	60	unit_notify(UNIT(d), state_translation_table[old_state], state_translation_table[state]);
	61	}
	62
	63	static int device_coldplug(Unit *u) {
	64	Device *d = DEVICE(u);
	65
	66	assert(d);
	67	assert(d->state == DEVICE_DEAD);
	68
	69	if (d->sysfs)
	70	device_set_state(d, DEVICE_AVAILABLE);
	71
	72	return 0;
	73	}
	74
	75	static void device_dump(Unit u, FILE f, const char *prefix) {
25ac040b	76	Device *d = DEVICE(u);
5cb5a6ff	77
25ac040b	78	assert(d);
5cb5a6ff LP	79
5cb5a6ff LP	80	fprintf(f,
25ac040b LP	81	"%sDevice State: %s\n"
25ac040b LP	82	"%sSysfs Path: %s\n",
a16e1123	83	prefix, device_state_to_string(d->state),
f50e0a01 LP	84	prefix, strna(d->sysfs));
	85	}
	86
	87	static UnitActiveState device_active_state(Unit *u) {
	88	assert(u);
	89
	90	return state_translation_table[DEVICE(u)->state];
25ac040b LP	91	}
25ac040b LP	92
10a94420 LP	93	static const char device_sub_state_to_string(Unit u) {
	94	assert(u);
	95
a16e1123	96	return device_state_to_string(DEVICE(u)->state);
10a94420 LP	97	}
10a94420 LP	98
2e478a46	99	static int device_add_escaped_name(Unit u, const char dn, bool make_id) {
25ac040b LP	100	char *e;
	101	int r;
	102
	103	assert(u);
	104	assert(dn);
	105	assert(dn[0] == '/');
	106
a16e1123	107	if (!(e = unit_name_from_path(dn, ".device")))
25ac040b LP	108	return -ENOMEM;
	109
	110	r = unit_add_name(u, e);
b08d03ff LP	111
	112	if (r >= 0 && make_id)
	113	unit_choose_id(u, e);
	114
25ac040b LP	115	free(e);
	116
	117	if (r < 0 && r != -EEXIST)
	118	return r;
	119
	120	return 0;
	121	}
	122
aab14b13 LP	123	static int device_find_escape_name(Manager m, const char dn, Unit **_u) {
	124	char *e;
	125	Unit *u;
	126
	127	assert(m);
	128	assert(dn);
	129	assert(dn[0] == '/');
	130	assert(_u);
	131
a16e1123	132	if (!(e = unit_name_from_path(dn, ".device")))
aab14b13 LP	133	return -ENOMEM;
	134
	135	u = manager_get_unit(m, e);
	136	free(e);
	137
	138	if (u) {
	139	*_u = u;
	140	return 1;
	141	}
	142
	143	return 0;
	144	}
	145
f94ea366	146	static int device_process_new_device(Manager m, struct udev_device dev, bool update_state) {
0d906814	147	const char dn, wants, sysfs, expose, *model;
25ac040b LP	148	Unit *u = NULL;
25ac040b LP	149	int r;
aab14b13	150	char w, state;
25ac040b LP	151	size_t l;
	152	bool delete;
	153	struct udev_list_entry item = NULL, first = NULL;
09e80b16	154	int b;
25ac040b LP	155
	156	assert(m);
	157
7f275a9f LP	158	if (!(sysfs = udev_device_get_syspath(dev)))
	159	return -ENOMEM;
	160
09e80b16 LP	161	if (!(expose = udev_device_get_property_value(dev, "SYSTEMD_EXPOSE")))
	162	return 0;
	163
	164	if ((b = parse_boolean(expose)) < 0) {
	165	log_error("Failed to parse SYSTEMD_EXPOSE udev property for device %s: %s", sysfs, expose);
	166	return 0;
	167	}
	168
	169	if (!b)
	170	return 0;
	171
25ac040b LP	172	/* Check whether this entry is even relevant for us. */
25ac040b LP	173	dn = udev_device_get_devnode(dev);
25ac040b LP	174	wants = udev_device_get_property_value(dev, "SYSTEMD_WANTS");
25ac040b LP	175
aab14b13 LP	176	if ((r = device_find_escape_name(m, sysfs, &u)) < 0)
aab14b13 LP	177	return r;
25ac040b	178
aab14b13 LP	179	if (r == 0 && dn)
	180	if ((r = device_find_escape_name(m, dn, &u)) < 0)
	181	return r;
25ac040b	182
aab14b13 LP	183	if (r == 0) {
	184	first = udev_device_get_devlinks_list_entry(dev);
	185	udev_list_entry_foreach(item, first) {
	186	if ((r = device_find_escape_name(m, udev_list_entry_get_name(item), &u)) < 0)
	187	return r;
25ac040b	188
aab14b13 LP	189	if (r > 0)
aab14b13 LP	190	break;
25ac040b	191	}
aab14b13 LP	192	}
	193
	194	/* FIXME: this needs proper merging */
	195
	196	assert((r > 0) == !!u);
	197
	198	/* If this is a different unit, then let's not merge things */
	199	if (u && DEVICE(u)->sysfs && !streq(DEVICE(u)->sysfs, sysfs))
	200	u = NULL;
25ac040b	201
aab14b13 LP	202	if (!u) {
	203	delete = true;
	204
	205	if (!(u = unit_new(m)))
	206	return -ENOMEM;
25ac040b	207
aab14b13	208	if ((r = device_add_escaped_name(u, sysfs, true)) < 0)
25ac040b LP	209	goto fail;
25ac040b LP	210
e537352b LP	211	unit_add_to_load_queue(u);
	212	} else
	213	delete = false;
	214
	215	if (!(DEVICE(u)->sysfs))
25ac040b LP	216	if (!(DEVICE(u)->sysfs = strdup(sysfs))) {
	217	r = -ENOMEM;
	218	goto fail;
	219	}
	220
25ac040b	221	if (dn)
2e478a46	222	if ((r = device_add_escaped_name(u, dn, true)) < 0)
25ac040b LP	223	goto fail;
	224
	225	first = udev_device_get_devlinks_list_entry(dev);
	226	udev_list_entry_foreach(item, first)
2e478a46	227	if ((r = device_add_escaped_name(u, udev_list_entry_get_name(item), false)) < 0)
25ac040b LP	228	goto fail;
25ac040b LP	229
aab14b13 LP	230	if ((model = udev_device_get_property_value(dev, "ID_MODEL_FROM_DATABASE")) \|\|
	231	(model = udev_device_get_property_value(dev, "ID_MODEL"))) {
	232	if ((r = unit_set_description(u, model)) < 0)
	233	goto fail;
	234	} else if (dn)
	235	if ((r = unit_set_description(u, dn)) < 0)
	236	goto fail;
	237
25ac040b LP	238	if (wants) {
25ac040b LP	239	FOREACH_WORD(w, l, wants, state) {
aab14b13 LP	240	char *e;
aab14b13 LP	241
b866264a LP	242	if (!(e = strndup(w, l))) {
b866264a LP	243	r = -ENOMEM;
25ac040b	244	goto fail;
b866264a	245	}
25ac040b	246
701cc384	247	r = unit_add_dependency_by_name(u, UNIT_WANTS, NULL, e, true);
25ac040b LP	248	free(e);
	249
	250	if (r < 0)
	251	goto fail;
	252	}
	253	}
	254
f94ea366 LP	255	if (update_state) {
	256	manager_dispatch_load_queue(u->meta.manager);
	257	device_set_state(DEVICE(u), DEVICE_AVAILABLE);
	258	}
	259
c1e1601e LP	260	unit_add_to_dbus_queue(u);
c1e1601e LP	261
25ac040b LP	262	return 0;
	263
	264	fail:
	265	if (delete && u)
	266	unit_free(u);
	267	return r;
	268	}
	269
f94ea366	270	static int device_process_path(Manager m, const char path, bool update_state) {
25ac040b LP	271	int r;
	272	struct udev_device *dev;
	273
	274	assert(m);
	275	assert(path);
	276
	277	if (!(dev = udev_device_new_from_syspath(m->udev, path))) {
	278	log_warning("Failed to get udev device object from udev for path %s.", path);
	279	return -ENOMEM;
	280	}
	281
f94ea366	282	r = device_process_new_device(m, dev, update_state);
25ac040b LP	283	udev_device_unref(dev);
	284	return r;
	285	}
	286
f94ea366 LP	287	static int device_process_removed_device(Manager m, struct udev_device dev) {
	288	const char *sysfs;
	289	char *e;
	290	Unit *u;
	291	Device *d;
	292
	293	assert(m);
	294	assert(dev);
	295
	296	if (!(sysfs = udev_device_get_syspath(dev)))
	297	return -ENOMEM;
	298
	299	assert(sysfs[0] == '/');
a16e1123	300	if (!(e = unit_name_from_path(sysfs, ".device")))
f94ea366 LP	301	return -ENOMEM;
	302
	303	u = manager_get_unit(m, e);
	304	free(e);
	305
	306	if (!u)
	307	return 0;
	308
	309	d = DEVICE(u);
	310	free(d->sysfs);
	311	d->sysfs = NULL;
	312
	313	device_set_state(d, DEVICE_DEAD);
	314	return 0;
	315	}
	316
25ac040b LP	317	static void device_shutdown(Manager *m) {
	318	assert(m);
	319
a16e1123	320	if (m->udev_monitor) {
f94ea366	321	udev_monitor_unref(m->udev_monitor);
a16e1123 LP	322	m->udev_monitor = NULL;
a16e1123 LP	323	}
f94ea366	324
a16e1123	325	if (m->udev) {
25ac040b	326	udev_unref(m->udev);
a16e1123 LP	327	m->udev = NULL;
a16e1123 LP	328	}
25ac040b LP	329	}
	330
	331	static int device_enumerate(Manager *m) {
f94ea366	332	struct epoll_event ev;
25ac040b LP	333	int r;
	334	struct udev_enumerate *e = NULL;
	335	struct udev_list_entry item = NULL, first = NULL;
	336
	337	assert(m);
	338
a16e1123 LP	339	if (!m->udev) {
	340	if (!(m->udev = udev_new()))
	341	return -ENOMEM;
25ac040b	342
a16e1123 LP	343	if (!(m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev"))) {
	344	r = -ENOMEM;
	345	goto fail;
	346	}
f94ea366	347
a16e1123 LP	348	if (udev_monitor_enable_receiving(m->udev_monitor) < 0) {
	349	r = -EIO;
	350	goto fail;
	351	}
f94ea366	352
a16e1123 LP	353	m->udev_watch.type = WATCH_UDEV;
a16e1123 LP	354	m->udev_watch.fd = udev_monitor_get_fd(m->udev_monitor);
f94ea366	355
a16e1123 LP	356	zero(ev);
	357	ev.events = EPOLLIN;
	358	ev.data.ptr = &m->udev_watch;
f94ea366	359
a16e1123 LP	360	if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_watch.fd, &ev) < 0)
	361	return -errno;
	362	}
f94ea366	363
4f2d528d LP	364	if (!(e = udev_enumerate_new(m->udev))) {
	365	r = -ENOMEM;
	366	goto fail;
	367	}
25ac040b	368
4f2d528d LP	369	if (udev_enumerate_scan_devices(e) < 0) {
	370	r = -EIO;
	371	goto fail;
	372	}
25ac040b	373
4f2d528d LP	374	first = udev_enumerate_get_list_entry(e);
	375	udev_list_entry_foreach(item, first)
	376	device_process_path(m, udev_list_entry_get_name(item), false);
25ac040b	377
4f2d528d	378	udev_enumerate_unref(e);
25ac040b LP	379	return 0;
	380
	381	fail:
	382	if (e)
	383	udev_enumerate_unref(e);
	384
	385	device_shutdown(m);
	386	return r;
5cb5a6ff LP	387	}
5cb5a6ff LP	388
f94ea366 LP	389	void device_fd_event(Manager *m, int events) {
	390	struct udev_device *dev;
	391	int r;
	392	const char *action;
	393
	394	assert(m);
	395	assert(events == EPOLLIN);
	396
f94ea366 LP	397	if (!(dev = udev_monitor_receive_device(m->udev_monitor))) {
	398	log_error("Failed to receive device.");
	399	return;
	400	}
	401
	402	if (!(action = udev_device_get_action(dev))) {
	403	log_error("Failed to get udev action string.");
	404	goto fail;
	405	}
	406
	407	if (streq(action, "remove")) {
	408	if ((r = device_process_removed_device(m, dev)) < 0) {
	409	log_error("Failed to process udev device event: %s", strerror(-r));
	410	goto fail;
	411	}
	412	} else {
	413	if ((r = device_process_new_device(m, dev, true)) < 0) {
	414	log_error("Failed to process udev device event: %s", strerror(-r));
	415	goto fail;
	416	}
	417	}
	418
	419	fail:
	420	udev_device_unref(dev);
	421	}
	422
a16e1123 LP	423	static const char* const device_state_table[_DEVICE_STATE_MAX] = {
	424	[DEVICE_DEAD] = "dead",
	425	[DEVICE_AVAILABLE] = "available"
	426	};
	427
	428	DEFINE_STRING_TABLE_LOOKUP(device_state, DeviceState);
	429
87f0e418	430	const UnitVTable device_vtable = {
5cb5a6ff LP	431	.suffix = ".device",
5cb5a6ff LP	432
9e2f7c11 LP	433	.no_requires = true,
9e2f7c11 LP	434	.no_instances = true,
41447faf	435	.no_snapshots = true,
c497c7a9	436	.no_isolate = true,
9e2f7c11	437
e537352b	438	.load = unit_load_fragment_and_dropin_optional,
034c6ed7	439	.done = device_done,
f50e0a01 LP	440	.coldplug = device_coldplug,
f50e0a01 LP	441
5cb5a6ff LP	442	.dump = device_dump,
5cb5a6ff LP	443
f50e0a01	444	.active_state = device_active_state,
10a94420	445	.sub_state_to_string = device_sub_state_to_string,
25ac040b	446
4139c1b2 LP	447	.bus_message_handler = bus_device_message_handler,
4139c1b2 LP	448
f50e0a01 LP	449	.enumerate = device_enumerate,
f50e0a01 LP	450	.shutdown = device_shutdown
5cb5a6ff	451	};