[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 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_init(Unit *u) {
        Device *d = DEVICE(u);

        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(d)->meta.id, 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_string_table[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 state_string_table[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_build_escape(dn+1, NULL, ".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_build_escape(dn+1, NULL, ".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, *names, *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);
        names = udev_device_get_property_value(dev, "SYSTEMD_NAMES");
        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;

        /* 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) {
                        char *e;

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

                        r = unit_add_name(u, e);
                        free(e);

                        if (r < 0 && r != -EEXIST)
                                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);
                        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_build_escape(sysfs+1, NULL, ".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;

        assert(m);

        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);
}

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

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

        .init = device_init,
        .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
	38	static const char* const state_string_table[_DEVICE_STATE_MAX] = {
	39	[DEVICE_DEAD] = "dead",
	40	[DEVICE_AVAILABLE] = "available"
	41	};
	42
87f0e418 LP	43	static void device_done(Unit *u) {
87f0e418 LP	44	Device *d = DEVICE(u);
034c6ed7 LP	45
034c6ed7 LP	46	assert(d);
e537352b	47
25ac040b	48	free(d->sysfs);
e537352b LP	49	d->sysfs = NULL;
	50	}
	51
	52	static void device_init(Unit *u) {
	53	Device *d = DEVICE(u);
	54
	55	assert(d);
	56	assert(u->meta.load_state == UNIT_STUB);
	57
	58	d->state = 0;
034c6ed7 LP	59	}
034c6ed7 LP	60
f50e0a01 LP	61	static void device_set_state(Device *d, DeviceState state) {
	62	DeviceState old_state;
	63	assert(d);
5cb5a6ff	64
f50e0a01 LP	65	old_state = d->state;
f50e0a01 LP	66	d->state = state;
5cb5a6ff	67
e537352b	68	if (state != old_state)
9e2f7c11	69	log_debug("%s changed %s → %s", UNIT(d)->meta.id, state_string_table[old_state], state_string_table[state]);
f50e0a01 LP	70
	71	unit_notify(UNIT(d), state_translation_table[old_state], state_translation_table[state]);
	72	}
	73
	74	static int device_coldplug(Unit *u) {
	75	Device *d = DEVICE(u);
	76
	77	assert(d);
	78	assert(d->state == DEVICE_DEAD);
	79
	80	if (d->sysfs)
	81	device_set_state(d, DEVICE_AVAILABLE);
	82
	83	return 0;
	84	}
	85
	86	static void device_dump(Unit u, FILE f, const char *prefix) {
25ac040b	87	Device *d = DEVICE(u);
5cb5a6ff	88
25ac040b	89	assert(d);
5cb5a6ff LP	90
5cb5a6ff LP	91	fprintf(f,
25ac040b LP	92	"%sDevice State: %s\n"
25ac040b LP	93	"%sSysfs Path: %s\n",
f50e0a01 LP	94	prefix, state_string_table[d->state],
	95	prefix, strna(d->sysfs));
	96	}
	97
	98	static UnitActiveState device_active_state(Unit *u) {
	99	assert(u);
	100
	101	return state_translation_table[DEVICE(u)->state];
25ac040b LP	102	}
25ac040b LP	103
10a94420 LP	104	static const char device_sub_state_to_string(Unit u) {
	105	assert(u);
	106
	107	return state_string_table[DEVICE(u)->state];
	108	}
	109
2e478a46	110	static int device_add_escaped_name(Unit u, const char dn, bool make_id) {
25ac040b LP	111	char *e;
	112	int r;
	113
	114	assert(u);
	115	assert(dn);
	116	assert(dn[0] == '/');
	117
9e2f7c11	118	if (!(e = unit_name_build_escape(dn+1, NULL, ".device")))
25ac040b LP	119	return -ENOMEM;
	120
	121	r = unit_add_name(u, e);
b08d03ff LP	122
	123	if (r >= 0 && make_id)
	124	unit_choose_id(u, e);
	125
25ac040b LP	126	free(e);
	127
	128	if (r < 0 && r != -EEXIST)
	129	return r;
	130
	131	return 0;
	132	}
	133
aab14b13 LP	134	static int device_find_escape_name(Manager m, const char dn, Unit **_u) {
	135	char *e;
	136	Unit *u;
	137
	138	assert(m);
	139	assert(dn);
	140	assert(dn[0] == '/');
	141	assert(_u);
	142
9e2f7c11	143	if (!(e = unit_name_build_escape(dn+1, NULL, ".device")))
aab14b13 LP	144	return -ENOMEM;
	145
	146	u = manager_get_unit(m, e);
	147	free(e);
	148
	149	if (u) {
	150	*_u = u;
	151	return 1;
	152	}
	153
	154	return 0;
	155	}
	156
f94ea366	157	static int device_process_new_device(Manager m, struct udev_device dev, bool update_state) {
aab14b13	158	const char dn, names, wants, sysfs, expose, model;
25ac040b LP	159	Unit *u = NULL;
25ac040b LP	160	int r;
aab14b13	161	char w, state;
25ac040b LP	162	size_t l;
	163	bool delete;
	164	struct udev_list_entry item = NULL, first = NULL;
09e80b16	165	int b;
25ac040b LP	166
	167	assert(m);
	168
7f275a9f LP	169	if (!(sysfs = udev_device_get_syspath(dev)))
	170	return -ENOMEM;
	171
09e80b16 LP	172	if (!(expose = udev_device_get_property_value(dev, "SYSTEMD_EXPOSE")))
	173	return 0;
	174
	175	if ((b = parse_boolean(expose)) < 0) {
	176	log_error("Failed to parse SYSTEMD_EXPOSE udev property for device %s: %s", sysfs, expose);
	177	return 0;
	178	}
	179
	180	if (!b)
	181	return 0;
	182
25ac040b LP	183	/* Check whether this entry is even relevant for us. */
	184	dn = udev_device_get_devnode(dev);
	185	names = udev_device_get_property_value(dev, "SYSTEMD_NAMES");
	186	wants = udev_device_get_property_value(dev, "SYSTEMD_WANTS");
	187
aab14b13 LP	188	if ((r = device_find_escape_name(m, sysfs, &u)) < 0)
aab14b13 LP	189	return r;
25ac040b	190
aab14b13 LP	191	if (r == 0 && dn)
	192	if ((r = device_find_escape_name(m, dn, &u)) < 0)
	193	return r;
25ac040b	194
aab14b13 LP	195	if (r == 0) {
	196	first = udev_device_get_devlinks_list_entry(dev);
	197	udev_list_entry_foreach(item, first) {
	198	if ((r = device_find_escape_name(m, udev_list_entry_get_name(item), &u)) < 0)
	199	return r;
25ac040b	200
aab14b13 LP	201	if (r > 0)
aab14b13 LP	202	break;
25ac040b	203	}
aab14b13 LP	204	}
	205
	206	/* FIXME: this needs proper merging */
	207
	208	assert((r > 0) == !!u);
	209
	210	/* If this is a different unit, then let's not merge things */
	211	if (u && DEVICE(u)->sysfs && !streq(DEVICE(u)->sysfs, sysfs))
	212	u = NULL;
25ac040b	213
aab14b13 LP	214	if (!u) {
	215	delete = true;
	216
	217	if (!(u = unit_new(m)))
	218	return -ENOMEM;
25ac040b	219
aab14b13	220	if ((r = device_add_escaped_name(u, sysfs, true)) < 0)
25ac040b LP	221	goto fail;
25ac040b LP	222
e537352b LP	223	unit_add_to_load_queue(u);
	224	} else
	225	delete = false;
	226
	227	if (!(DEVICE(u)->sysfs))
25ac040b LP	228	if (!(DEVICE(u)->sysfs = strdup(sysfs))) {
	229	r = -ENOMEM;
	230	goto fail;
	231	}
	232
25ac040b	233	if (dn)
2e478a46	234	if ((r = device_add_escaped_name(u, dn, true)) < 0)
25ac040b LP	235	goto fail;
	236
	237	first = udev_device_get_devlinks_list_entry(dev);
	238	udev_list_entry_foreach(item, first)
2e478a46	239	if ((r = device_add_escaped_name(u, udev_list_entry_get_name(item), false)) < 0)
25ac040b LP	240	goto fail;
25ac040b LP	241
aab14b13 LP	242	if ((model = udev_device_get_property_value(dev, "ID_MODEL_FROM_DATABASE")) \|\|
	243	(model = udev_device_get_property_value(dev, "ID_MODEL"))) {
	244	if ((r = unit_set_description(u, model)) < 0)
	245	goto fail;
	246	} else if (dn)
	247	if ((r = unit_set_description(u, dn)) < 0)
	248	goto fail;
	249
	250	/* We don't remove names that are gone. But that should be
	251	* fine and should probably be fixed only on a configuration
	252	* refresh. */
	253
25ac040b LP	254	if (names) {
25ac040b LP	255	FOREACH_WORD(w, l, names, state) {
aab14b13 LP	256	char *e;
aab14b13 LP	257
b866264a LP	258	if (!(e = strndup(w, l))) {
b866264a LP	259	r = -ENOMEM;
25ac040b	260	goto fail;
b866264a	261	}
25ac040b LP	262
	263	r = unit_add_name(u, e);
	264	free(e);
	265
	266	if (r < 0 && r != -EEXIST)
	267	goto fail;
	268	}
	269	}
	270
25ac040b LP	271	if (wants) {
25ac040b LP	272	FOREACH_WORD(w, l, wants, state) {
aab14b13 LP	273	char *e;
aab14b13 LP	274
b866264a LP	275	if (!(e = strndup(w, l))) {
b866264a LP	276	r = -ENOMEM;
25ac040b	277	goto fail;
b866264a	278	}
25ac040b	279
9e2f7c11	280	r = unit_add_dependency_by_name(u, UNIT_WANTS, NULL, e);
25ac040b LP	281	free(e);
	282
	283	if (r < 0)
	284	goto fail;
	285	}
	286	}
	287
f94ea366 LP	288	if (update_state) {
	289	manager_dispatch_load_queue(u->meta.manager);
	290	device_set_state(DEVICE(u), DEVICE_AVAILABLE);
	291	}
	292
c1e1601e LP	293	unit_add_to_dbus_queue(u);
c1e1601e LP	294
25ac040b LP	295	return 0;
	296
	297	fail:
	298	if (delete && u)
	299	unit_free(u);
	300	return r;
	301	}
	302
f94ea366	303	static int device_process_path(Manager m, const char path, bool update_state) {
25ac040b LP	304	int r;
	305	struct udev_device *dev;
	306
	307	assert(m);
	308	assert(path);
	309
	310	if (!(dev = udev_device_new_from_syspath(m->udev, path))) {
	311	log_warning("Failed to get udev device object from udev for path %s.", path);
	312	return -ENOMEM;
	313	}
	314
f94ea366	315	r = device_process_new_device(m, dev, update_state);
25ac040b LP	316	udev_device_unref(dev);
	317	return r;
	318	}
	319
f94ea366 LP	320	static int device_process_removed_device(Manager m, struct udev_device dev) {
	321	const char *sysfs;
	322	char *e;
	323	Unit *u;
	324	Device *d;
	325
	326	assert(m);
	327	assert(dev);
	328
	329	if (!(sysfs = udev_device_get_syspath(dev)))
	330	return -ENOMEM;
	331
	332	assert(sysfs[0] == '/');
9e2f7c11	333	if (!(e = unit_name_build_escape(sysfs+1, NULL, ".device")))
f94ea366 LP	334	return -ENOMEM;
	335
	336	u = manager_get_unit(m, e);
	337	free(e);
	338
	339	if (!u)
	340	return 0;
	341
	342	d = DEVICE(u);
	343	free(d->sysfs);
	344	d->sysfs = NULL;
	345
	346	device_set_state(d, DEVICE_DEAD);
	347	return 0;
	348	}
	349
25ac040b LP	350	static void device_shutdown(Manager *m) {
	351	assert(m);
	352
f94ea366 LP	353	if (m->udev_monitor)
	354	udev_monitor_unref(m->udev_monitor);
	355
25ac040b LP	356	if (m->udev)
	357	udev_unref(m->udev);
	358	}
	359
	360	static int device_enumerate(Manager *m) {
f94ea366	361	struct epoll_event ev;
25ac040b LP	362	int r;
	363	struct udev_enumerate *e = NULL;
	364	struct udev_list_entry item = NULL, first = NULL;
	365
	366	assert(m);
	367
	368	if (!(m->udev = udev_new()))
	369	return -ENOMEM;
	370
f94ea366 LP	371	if (!(m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev"))) {
	372	r = -ENOMEM;
	373	goto fail;
	374	}
	375
	376	if (udev_monitor_enable_receiving(m->udev_monitor) < 0) {
	377	r = -EIO;
	378	goto fail;
	379	}
	380
	381	m->udev_watch.type = WATCH_UDEV;
	382	m->udev_watch.fd = udev_monitor_get_fd(m->udev_monitor);
	383
	384	zero(ev);
	385	ev.events = EPOLLIN;
	386	ev.data.ptr = &m->udev_watch;
	387
	388	if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_watch.fd, &ev) < 0)
	389	return -errno;
	390
4f2d528d LP	391	if (!(e = udev_enumerate_new(m->udev))) {
	392	r = -ENOMEM;
	393	goto fail;
	394	}
25ac040b	395
4f2d528d LP	396	if (udev_enumerate_scan_devices(e) < 0) {
	397	r = -EIO;
	398	goto fail;
	399	}
25ac040b	400
4f2d528d LP	401	first = udev_enumerate_get_list_entry(e);
	402	udev_list_entry_foreach(item, first)
	403	device_process_path(m, udev_list_entry_get_name(item), false);
25ac040b	404
4f2d528d	405	udev_enumerate_unref(e);
25ac040b LP	406	return 0;
	407
	408	fail:
	409	if (e)
	410	udev_enumerate_unref(e);
	411
	412	device_shutdown(m);
	413	return r;
5cb5a6ff LP	414	}
5cb5a6ff LP	415
f94ea366 LP	416	void device_fd_event(Manager *m, int events) {
	417	struct udev_device *dev;
	418	int r;
	419	const char *action;
	420
	421	assert(m);
	422	assert(events == EPOLLIN);
	423
f94ea366 LP	424	if (!(dev = udev_monitor_receive_device(m->udev_monitor))) {
	425	log_error("Failed to receive device.");
	426	return;
	427	}
	428
	429	if (!(action = udev_device_get_action(dev))) {
	430	log_error("Failed to get udev action string.");
	431	goto fail;
	432	}
	433
	434	if (streq(action, "remove")) {
	435	if ((r = device_process_removed_device(m, dev)) < 0) {
	436	log_error("Failed to process udev device event: %s", strerror(-r));
	437	goto fail;
	438	}
	439	} else {
	440	if ((r = device_process_new_device(m, dev, true)) < 0) {
	441	log_error("Failed to process udev device event: %s", strerror(-r));
	442	goto fail;
	443	}
	444	}
	445
	446	fail:
	447	udev_device_unref(dev);
	448	}
	449
87f0e418	450	const UnitVTable device_vtable = {
5cb5a6ff LP	451	.suffix = ".device",
5cb5a6ff LP	452
9e2f7c11 LP	453	.no_requires = true,
9e2f7c11 LP	454	.no_instances = true,
41447faf	455	.no_snapshots = true,
9e2f7c11	456
e537352b LP	457	.init = device_init,
e537352b LP	458	.load = unit_load_fragment_and_dropin_optional,
034c6ed7	459	.done = device_done,
f50e0a01 LP	460	.coldplug = device_coldplug,
f50e0a01 LP	461
5cb5a6ff LP	462	.dump = device_dump,
5cb5a6ff LP	463
f50e0a01	464	.active_state = device_active_state,
10a94420	465	.sub_state_to_string = device_sub_state_to_string,
25ac040b	466
4139c1b2 LP	467	.bus_message_handler = bus_device_message_handler,
4139c1b2 LP	468
f50e0a01 LP	469	.enumerate = device_enumerate,
f50e0a01 LP	470	.shutdown = device_shutdown
5cb5a6ff	471	};