[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"

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,

        .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,

        .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"
5cb5a6ff	31
f50e0a01 LP	32	static const UnitActiveState state_translation_table[_DEVICE_STATE_MAX] = {
	33	[DEVICE_DEAD] = UNIT_INACTIVE,
	34	[DEVICE_AVAILABLE] = UNIT_ACTIVE
	35	};
	36
	37	static const char* const state_string_table[_DEVICE_STATE_MAX] = {
	38	[DEVICE_DEAD] = "dead",
	39	[DEVICE_AVAILABLE] = "available"
	40	};
	41
87f0e418 LP	42	static void device_done(Unit *u) {
87f0e418 LP	43	Device *d = DEVICE(u);
034c6ed7 LP	44
034c6ed7 LP	45	assert(d);
e537352b	46
25ac040b	47	free(d->sysfs);
e537352b LP	48	d->sysfs = NULL;
	49	}
	50
	51	static void device_init(Unit *u) {
	52	Device *d = DEVICE(u);
	53
	54	assert(d);
	55	assert(u->meta.load_state == UNIT_STUB);
	56
	57	d->state = 0;
034c6ed7 LP	58	}
034c6ed7 LP	59
f50e0a01 LP	60	static void device_set_state(Device *d, DeviceState state) {
	61	DeviceState old_state;
	62	assert(d);
5cb5a6ff	63
f50e0a01 LP	64	old_state = d->state;
f50e0a01 LP	65	d->state = state;
5cb5a6ff	66
e537352b	67	if (state != old_state)
9e2f7c11	68	log_debug("%s changed %s → %s", UNIT(d)->meta.id, state_string_table[old_state], state_string_table[state]);
f50e0a01 LP	69
	70	unit_notify(UNIT(d), state_translation_table[old_state], state_translation_table[state]);
	71	}
	72
	73	static int device_coldplug(Unit *u) {
	74	Device *d = DEVICE(u);
	75
	76	assert(d);
	77	assert(d->state == DEVICE_DEAD);
	78
	79	if (d->sysfs)
	80	device_set_state(d, DEVICE_AVAILABLE);
	81
	82	return 0;
	83	}
	84
	85	static void device_dump(Unit u, FILE f, const char *prefix) {
25ac040b	86	Device *d = DEVICE(u);
5cb5a6ff	87
25ac040b	88	assert(d);
5cb5a6ff LP	89
5cb5a6ff LP	90	fprintf(f,
25ac040b LP	91	"%sDevice State: %s\n"
25ac040b LP	92	"%sSysfs Path: %s\n",
f50e0a01 LP	93	prefix, state_string_table[d->state],
	94	prefix, strna(d->sysfs));
	95	}
	96
	97	static UnitActiveState device_active_state(Unit *u) {
	98	assert(u);
	99
	100	return state_translation_table[DEVICE(u)->state];
25ac040b LP	101	}
25ac040b LP	102
10a94420 LP	103	static const char device_sub_state_to_string(Unit u) {
	104	assert(u);
	105
	106	return state_string_table[DEVICE(u)->state];
	107	}
	108
2e478a46	109	static int device_add_escaped_name(Unit u, const char dn, bool make_id) {
25ac040b LP	110	char *e;
	111	int r;
	112
	113	assert(u);
	114	assert(dn);
	115	assert(dn[0] == '/');
	116
9e2f7c11	117	if (!(e = unit_name_build_escape(dn+1, NULL, ".device")))
25ac040b LP	118	return -ENOMEM;
	119
	120	r = unit_add_name(u, e);
b08d03ff LP	121
	122	if (r >= 0 && make_id)
	123	unit_choose_id(u, e);
	124
25ac040b LP	125	free(e);
	126
	127	if (r < 0 && r != -EEXIST)
	128	return r;
	129
	130	return 0;
	131	}
	132
aab14b13 LP	133	static int device_find_escape_name(Manager m, const char dn, Unit **_u) {
	134	char *e;
	135	Unit *u;
	136
	137	assert(m);
	138	assert(dn);
	139	assert(dn[0] == '/');
	140	assert(_u);
	141
9e2f7c11	142	if (!(e = unit_name_build_escape(dn+1, NULL, ".device")))
aab14b13 LP	143	return -ENOMEM;
	144
	145	u = manager_get_unit(m, e);
	146	free(e);
	147
	148	if (u) {
	149	*_u = u;
	150	return 1;
	151	}
	152
	153	return 0;
	154	}
	155
f94ea366	156	static int device_process_new_device(Manager m, struct udev_device dev, bool update_state) {
aab14b13	157	const char dn, names, wants, sysfs, expose, model;
25ac040b LP	158	Unit *u = NULL;
25ac040b LP	159	int r;
aab14b13	160	char w, state;
25ac040b LP	161	size_t l;
	162	bool delete;
	163	struct udev_list_entry item = NULL, first = NULL;
09e80b16	164	int b;
25ac040b LP	165
	166	assert(m);
	167
7f275a9f LP	168	if (!(sysfs = udev_device_get_syspath(dev)))
	169	return -ENOMEM;
	170
09e80b16 LP	171	if (!(expose = udev_device_get_property_value(dev, "SYSTEMD_EXPOSE")))
	172	return 0;
	173
	174	if ((b = parse_boolean(expose)) < 0) {
	175	log_error("Failed to parse SYSTEMD_EXPOSE udev property for device %s: %s", sysfs, expose);
	176	return 0;
	177	}
	178
	179	if (!b)
	180	return 0;
	181
25ac040b LP	182	/* Check whether this entry is even relevant for us. */
	183	dn = udev_device_get_devnode(dev);
	184	names = udev_device_get_property_value(dev, "SYSTEMD_NAMES");
	185	wants = udev_device_get_property_value(dev, "SYSTEMD_WANTS");
	186
aab14b13 LP	187	if ((r = device_find_escape_name(m, sysfs, &u)) < 0)
aab14b13 LP	188	return r;
25ac040b	189
aab14b13 LP	190	if (r == 0 && dn)
	191	if ((r = device_find_escape_name(m, dn, &u)) < 0)
	192	return r;
25ac040b	193
aab14b13 LP	194	if (r == 0) {
	195	first = udev_device_get_devlinks_list_entry(dev);
	196	udev_list_entry_foreach(item, first) {
	197	if ((r = device_find_escape_name(m, udev_list_entry_get_name(item), &u)) < 0)
	198	return r;
25ac040b	199
aab14b13 LP	200	if (r > 0)
aab14b13 LP	201	break;
25ac040b	202	}
aab14b13 LP	203	}
	204
	205	/* FIXME: this needs proper merging */
	206
	207	assert((r > 0) == !!u);
	208
	209	/* If this is a different unit, then let's not merge things */
	210	if (u && DEVICE(u)->sysfs && !streq(DEVICE(u)->sysfs, sysfs))
	211	u = NULL;
25ac040b	212
aab14b13 LP	213	if (!u) {
	214	delete = true;
	215
	216	if (!(u = unit_new(m)))
	217	return -ENOMEM;
25ac040b	218
aab14b13	219	if ((r = device_add_escaped_name(u, sysfs, true)) < 0)
25ac040b LP	220	goto fail;
25ac040b LP	221
e537352b LP	222	unit_add_to_load_queue(u);
	223	} else
	224	delete = false;
	225
	226	if (!(DEVICE(u)->sysfs))
25ac040b LP	227	if (!(DEVICE(u)->sysfs = strdup(sysfs))) {
	228	r = -ENOMEM;
	229	goto fail;
	230	}
	231
25ac040b	232	if (dn)
2e478a46	233	if ((r = device_add_escaped_name(u, dn, true)) < 0)
25ac040b LP	234	goto fail;
	235
	236	first = udev_device_get_devlinks_list_entry(dev);
	237	udev_list_entry_foreach(item, first)
2e478a46	238	if ((r = device_add_escaped_name(u, udev_list_entry_get_name(item), false)) < 0)
25ac040b LP	239	goto fail;
25ac040b LP	240
aab14b13 LP	241	if ((model = udev_device_get_property_value(dev, "ID_MODEL_FROM_DATABASE")) \|\|
	242	(model = udev_device_get_property_value(dev, "ID_MODEL"))) {
	243	if ((r = unit_set_description(u, model)) < 0)
	244	goto fail;
	245	} else if (dn)
	246	if ((r = unit_set_description(u, dn)) < 0)
	247	goto fail;
	248
	249	/* We don't remove names that are gone. But that should be
	250	* fine and should probably be fixed only on a configuration
	251	* refresh. */
	252
25ac040b LP	253	if (names) {
25ac040b LP	254	FOREACH_WORD(w, l, names, state) {
aab14b13 LP	255	char *e;
aab14b13 LP	256
b866264a LP	257	if (!(e = strndup(w, l))) {
b866264a LP	258	r = -ENOMEM;
25ac040b	259	goto fail;
b866264a	260	}
25ac040b LP	261
	262	r = unit_add_name(u, e);
	263	free(e);
	264
	265	if (r < 0 && r != -EEXIST)
	266	goto fail;
	267	}
	268	}
	269
25ac040b LP	270	if (wants) {
25ac040b LP	271	FOREACH_WORD(w, l, wants, state) {
aab14b13 LP	272	char *e;
aab14b13 LP	273
b866264a LP	274	if (!(e = strndup(w, l))) {
b866264a LP	275	r = -ENOMEM;
25ac040b	276	goto fail;
b866264a	277	}
25ac040b	278
9e2f7c11	279	r = unit_add_dependency_by_name(u, UNIT_WANTS, NULL, e);
25ac040b LP	280	free(e);
	281
	282	if (r < 0)
	283	goto fail;
	284	}
	285	}
	286
f94ea366 LP	287	if (update_state) {
	288	manager_dispatch_load_queue(u->meta.manager);
	289	device_set_state(DEVICE(u), DEVICE_AVAILABLE);
	290	}
	291
c1e1601e LP	292	unit_add_to_dbus_queue(u);
c1e1601e LP	293
25ac040b LP	294	return 0;
	295
	296	fail:
	297	if (delete && u)
	298	unit_free(u);
	299	return r;
	300	}
	301
f94ea366	302	static int device_process_path(Manager m, const char path, bool update_state) {
25ac040b LP	303	int r;
	304	struct udev_device *dev;
	305
	306	assert(m);
	307	assert(path);
	308
	309	if (!(dev = udev_device_new_from_syspath(m->udev, path))) {
	310	log_warning("Failed to get udev device object from udev for path %s.", path);
	311	return -ENOMEM;
	312	}
	313
f94ea366	314	r = device_process_new_device(m, dev, update_state);
25ac040b LP	315	udev_device_unref(dev);
	316	return r;
	317	}
	318
f94ea366 LP	319	static int device_process_removed_device(Manager m, struct udev_device dev) {
	320	const char *sysfs;
	321	char *e;
	322	Unit *u;
	323	Device *d;
	324
	325	assert(m);
	326	assert(dev);
	327
	328	if (!(sysfs = udev_device_get_syspath(dev)))
	329	return -ENOMEM;
	330
	331	assert(sysfs[0] == '/');
9e2f7c11	332	if (!(e = unit_name_build_escape(sysfs+1, NULL, ".device")))
f94ea366 LP	333	return -ENOMEM;
	334
	335	u = manager_get_unit(m, e);
	336	free(e);
	337
	338	if (!u)
	339	return 0;
	340
	341	d = DEVICE(u);
	342	free(d->sysfs);
	343	d->sysfs = NULL;
	344
	345	device_set_state(d, DEVICE_DEAD);
	346	return 0;
	347	}
	348
25ac040b LP	349	static void device_shutdown(Manager *m) {
	350	assert(m);
	351
f94ea366 LP	352	if (m->udev_monitor)
	353	udev_monitor_unref(m->udev_monitor);
	354
25ac040b LP	355	if (m->udev)
	356	udev_unref(m->udev);
	357	}
	358
	359	static int device_enumerate(Manager *m) {
f94ea366	360	struct epoll_event ev;
25ac040b LP	361	int r;
	362	struct udev_enumerate *e = NULL;
	363	struct udev_list_entry item = NULL, first = NULL;
	364
	365	assert(m);
	366
	367	if (!(m->udev = udev_new()))
	368	return -ENOMEM;
	369
f94ea366 LP	370	if (!(m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev"))) {
	371	r = -ENOMEM;
	372	goto fail;
	373	}
	374
	375	if (udev_monitor_enable_receiving(m->udev_monitor) < 0) {
	376	r = -EIO;
	377	goto fail;
	378	}
	379
	380	m->udev_watch.type = WATCH_UDEV;
	381	m->udev_watch.fd = udev_monitor_get_fd(m->udev_monitor);
	382
	383	zero(ev);
	384	ev.events = EPOLLIN;
	385	ev.data.ptr = &m->udev_watch;
	386
	387	if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_watch.fd, &ev) < 0)
	388	return -errno;
	389
4f2d528d LP	390	if (!(e = udev_enumerate_new(m->udev))) {
	391	r = -ENOMEM;
	392	goto fail;
	393	}
25ac040b	394
4f2d528d LP	395	if (udev_enumerate_scan_devices(e) < 0) {
	396	r = -EIO;
	397	goto fail;
	398	}
25ac040b	399
4f2d528d LP	400	first = udev_enumerate_get_list_entry(e);
	401	udev_list_entry_foreach(item, first)
	402	device_process_path(m, udev_list_entry_get_name(item), false);
25ac040b	403
4f2d528d	404	udev_enumerate_unref(e);
25ac040b LP	405	return 0;
	406
	407	fail:
	408	if (e)
	409	udev_enumerate_unref(e);
	410
	411	device_shutdown(m);
	412	return r;
5cb5a6ff LP	413	}
5cb5a6ff LP	414
f94ea366 LP	415	void device_fd_event(Manager *m, int events) {
	416	struct udev_device *dev;
	417	int r;
	418	const char *action;
	419
	420	assert(m);
	421	assert(events == EPOLLIN);
	422
f94ea366 LP	423	if (!(dev = udev_monitor_receive_device(m->udev_monitor))) {
	424	log_error("Failed to receive device.");
	425	return;
	426	}
	427
	428	if (!(action = udev_device_get_action(dev))) {
	429	log_error("Failed to get udev action string.");
	430	goto fail;
	431	}
	432
	433	if (streq(action, "remove")) {
	434	if ((r = device_process_removed_device(m, dev)) < 0) {
	435	log_error("Failed to process udev device event: %s", strerror(-r));
	436	goto fail;
	437	}
	438	} else {
	439	if ((r = device_process_new_device(m, dev, true)) < 0) {
	440	log_error("Failed to process udev device event: %s", strerror(-r));
	441	goto fail;
	442	}
	443	}
	444
	445	fail:
	446	udev_device_unref(dev);
	447	}
	448
87f0e418	449	const UnitVTable device_vtable = {
5cb5a6ff LP	450	.suffix = ".device",
5cb5a6ff LP	451
9e2f7c11 LP	452	.no_requires = true,
	453	.no_instances = true,
	454
e537352b LP	455	.init = device_init,
e537352b LP	456	.load = unit_load_fragment_and_dropin_optional,
034c6ed7	457	.done = device_done,
f50e0a01 LP	458	.coldplug = device_coldplug,
f50e0a01 LP	459
5cb5a6ff LP	460	.dump = device_dump,
5cb5a6ff LP	461
f50e0a01	462	.active_state = device_active_state,
10a94420	463	.sub_state_to_string = device_sub_state_to_string,
25ac040b	464
f50e0a01 LP	465	.enumerate = device_enumerate,
f50e0a01 LP	466	.shutdown = device_shutdown
5cb5a6ff	467	};