[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"

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_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_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_escape_path(dn+1, ".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_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 *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 (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 ((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, 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_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;

        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",

        .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"
5cb5a6ff	30
f50e0a01 LP	31	static const UnitActiveState state_translation_table[_DEVICE_STATE_MAX] = {
	32	[DEVICE_DEAD] = UNIT_INACTIVE,
	33	[DEVICE_AVAILABLE] = UNIT_ACTIVE
	34	};
	35
	36	static const char* const state_string_table[_DEVICE_STATE_MAX] = {
	37	[DEVICE_DEAD] = "dead",
	38	[DEVICE_AVAILABLE] = "available"
	39	};
	40
87f0e418 LP	41	static void device_done(Unit *u) {
87f0e418 LP	42	Device *d = DEVICE(u);
034c6ed7 LP	43
034c6ed7 LP	44	assert(d);
e537352b	45
25ac040b	46	free(d->sysfs);
e537352b LP	47	d->sysfs = NULL;
	48	}
	49
	50	static void device_init(Unit *u) {
	51	Device *d = DEVICE(u);
	52
	53	assert(d);
	54	assert(u->meta.load_state == UNIT_STUB);
	55
	56	d->state = 0;
034c6ed7 LP	57	}
034c6ed7 LP	58
f50e0a01 LP	59	static void device_set_state(Device *d, DeviceState state) {
	60	DeviceState old_state;
	61	assert(d);
5cb5a6ff	62
f50e0a01 LP	63	old_state = d->state;
f50e0a01 LP	64	d->state = state;
5cb5a6ff	65
e537352b LP	66	if (state != old_state)
e537352b LP	67	log_debug("%s changed %s → %s", unit_id(UNIT(d)), state_string_table[old_state], state_string_table[state]);
f50e0a01 LP	68
	69	unit_notify(UNIT(d), state_translation_table[old_state], state_translation_table[state]);
	70	}
	71
	72	static int device_coldplug(Unit *u) {
	73	Device *d = DEVICE(u);
	74
	75	assert(d);
	76	assert(d->state == DEVICE_DEAD);
	77
	78	if (d->sysfs)
	79	device_set_state(d, DEVICE_AVAILABLE);
	80
	81	return 0;
	82	}
	83
	84	static void device_dump(Unit u, FILE f, const char *prefix) {
25ac040b	85	Device *d = DEVICE(u);
5cb5a6ff	86
25ac040b	87	assert(d);
5cb5a6ff LP	88
5cb5a6ff LP	89	fprintf(f,
25ac040b LP	90	"%sDevice State: %s\n"
25ac040b LP	91	"%sSysfs Path: %s\n",
f50e0a01 LP	92	prefix, state_string_table[d->state],
	93	prefix, strna(d->sysfs));
	94	}
	95
	96	static UnitActiveState device_active_state(Unit *u) {
	97	assert(u);
	98
	99	return state_translation_table[DEVICE(u)->state];
25ac040b LP	100	}
25ac040b LP	101
10a94420 LP	102	static const char device_sub_state_to_string(Unit u) {
	103	assert(u);
	104
	105	return state_string_table[DEVICE(u)->state];
	106	}
	107
2e478a46	108	static int device_add_escaped_name(Unit u, const char dn, bool make_id) {
25ac040b LP	109	char *e;
	110	int r;
	111
	112	assert(u);
	113	assert(dn);
	114	assert(dn[0] == '/');
	115
2e478a46	116	if (!(e = unit_name_escape_path(dn+1, ".device")))
25ac040b LP	117	return -ENOMEM;
	118
	119	r = unit_add_name(u, e);
b08d03ff LP	120
	121	if (r >= 0 && make_id)
	122	unit_choose_id(u, e);
	123
25ac040b LP	124	free(e);
	125
	126	if (r < 0 && r != -EEXIST)
	127	return r;
	128
	129	return 0;
	130	}
	131
aab14b13 LP	132	static int device_find_escape_name(Manager m, const char dn, Unit **_u) {
	133	char *e;
	134	Unit *u;
	135
	136	assert(m);
	137	assert(dn);
	138	assert(dn[0] == '/');
	139	assert(_u);
	140
	141	if (!(e = unit_name_escape_path(dn+1, ".device")))
	142	return -ENOMEM;
	143
	144	u = manager_get_unit(m, e);
	145	free(e);
	146
	147	if (u) {
	148	*_u = u;
	149	return 1;
	150	}
	151
	152	return 0;
	153	}
	154
6326a423 LP	155	static bool devnode_is_api(const char *node) {
	156	unsigned i;
	157
	158	static const char * const table[] = {
	159	"/dev/null",
	160	"/dev/zero",
	161	"/dev/urandom",
	162	"/dev/random",
	163	"/dev/port",
	164	"/dev/oldmem",
	165	"/dev/full",
	166	"/dev/kmsg",
	167	"/dev/mem"
	168	};
	169
	170	for (i = 0; i < ELEMENTSOF(table); i++)
	171	if (streq(table[i], node))
	172	return true;
	173
	174	return false;
	175	}
	176
f94ea366	177	static int device_process_new_device(Manager m, struct udev_device dev, bool update_state) {
aab14b13	178	const char dn, names, wants, sysfs, expose, model;
25ac040b LP	179	Unit *u = NULL;
25ac040b LP	180	int r;
aab14b13	181	char w, state;
25ac040b LP	182	size_t l;
	183	bool delete;
	184	struct udev_list_entry item = NULL, first = NULL;
	185
	186	assert(m);
	187
7f275a9f LP	188	if (!(sysfs = udev_device_get_syspath(dev)))
	189	return -ENOMEM;
	190
25ac040b LP	191	/* Check whether this entry is even relevant for us. */
25ac040b LP	192	dn = udev_device_get_devnode(dev);
7f275a9f	193	expose = udev_device_get_property_value(dev, "SYSTEMD_EXPOSE");
25ac040b LP	194	names = udev_device_get_property_value(dev, "SYSTEMD_NAMES");
	195	wants = udev_device_get_property_value(dev, "SYSTEMD_WANTS");
	196
7f275a9f LP	197	if (expose) {
	198	int b;
	199
	200	if ((b = parse_boolean(expose)) < 0) {
	201	log_error("Failed to parse SYSTEMD_EXPOSE udev property for device %s: %s", sysfs, expose);
	202	return 0;
	203	}
	204
	205	if (!b)
	206	return 0;
	207	} else
6326a423	208	if ((!dn \|\| devnode_is_api(dn)) && !names && !wants)
7f275a9f	209	return 0;
25ac040b LP	210
	211	/* Ok, seems kinda interesting. Now, let's see if this one
	212	* already exists. */
	213
aab14b13 LP	214	if ((r = device_find_escape_name(m, sysfs, &u)) < 0)
aab14b13 LP	215	return r;
25ac040b	216
aab14b13 LP	217	if (r == 0 && dn)
	218	if ((r = device_find_escape_name(m, dn, &u)) < 0)
	219	return r;
25ac040b	220
aab14b13 LP	221	if (r == 0) {
	222	first = udev_device_get_devlinks_list_entry(dev);
	223	udev_list_entry_foreach(item, first) {
	224	if ((r = device_find_escape_name(m, udev_list_entry_get_name(item), &u)) < 0)
	225	return r;
25ac040b	226
aab14b13 LP	227	if (r > 0)
aab14b13 LP	228	break;
25ac040b	229	}
aab14b13 LP	230	}
	231
	232	/* FIXME: this needs proper merging */
	233
	234	assert((r > 0) == !!u);
	235
	236	/* If this is a different unit, then let's not merge things */
	237	if (u && DEVICE(u)->sysfs && !streq(DEVICE(u)->sysfs, sysfs))
	238	u = NULL;
25ac040b	239
aab14b13 LP	240	if (!u) {
	241	delete = true;
	242
	243	if (!(u = unit_new(m)))
	244	return -ENOMEM;
25ac040b	245
aab14b13	246	if ((r = device_add_escaped_name(u, sysfs, true)) < 0)
25ac040b LP	247	goto fail;
25ac040b LP	248
e537352b LP	249	unit_add_to_load_queue(u);
	250	} else
	251	delete = false;
	252
	253	if (!(DEVICE(u)->sysfs))
25ac040b LP	254	if (!(DEVICE(u)->sysfs = strdup(sysfs))) {
	255	r = -ENOMEM;
	256	goto fail;
	257	}
	258
25ac040b	259	if (dn)
2e478a46	260	if ((r = device_add_escaped_name(u, dn, true)) < 0)
25ac040b LP	261	goto fail;
	262
	263	first = udev_device_get_devlinks_list_entry(dev);
	264	udev_list_entry_foreach(item, first)
2e478a46	265	if ((r = device_add_escaped_name(u, udev_list_entry_get_name(item), false)) < 0)
25ac040b LP	266	goto fail;
25ac040b LP	267
aab14b13 LP	268	if ((model = udev_device_get_property_value(dev, "ID_MODEL_FROM_DATABASE")) \|\|
	269	(model = udev_device_get_property_value(dev, "ID_MODEL"))) {
	270	if ((r = unit_set_description(u, model)) < 0)
	271	goto fail;
	272	} else if (dn)
	273	if ((r = unit_set_description(u, dn)) < 0)
	274	goto fail;
	275
	276	/* We don't remove names that are gone. But that should be
	277	* fine and should probably be fixed only on a configuration
	278	* refresh. */
	279
25ac040b LP	280	if (names) {
25ac040b LP	281	FOREACH_WORD(w, l, names, state) {
aab14b13 LP	282	char *e;
aab14b13 LP	283
b866264a LP	284	if (!(e = strndup(w, l))) {
b866264a LP	285	r = -ENOMEM;
25ac040b	286	goto fail;
b866264a	287	}
25ac040b LP	288
	289	r = unit_add_name(u, e);
	290	free(e);
	291
	292	if (r < 0 && r != -EEXIST)
	293	goto fail;
	294	}
	295	}
	296
25ac040b LP	297	if (wants) {
25ac040b LP	298	FOREACH_WORD(w, l, wants, state) {
aab14b13 LP	299	char *e;
aab14b13 LP	300
b866264a LP	301	if (!(e = strndup(w, l))) {
b866264a LP	302	r = -ENOMEM;
25ac040b	303	goto fail;
b866264a	304	}
25ac040b LP	305
	306	r = unit_add_dependency_by_name(u, UNIT_WANTS, e);
	307	free(e);
	308
	309	if (r < 0)
	310	goto fail;
	311	}
	312	}
	313
f94ea366 LP	314	if (update_state) {
	315	manager_dispatch_load_queue(u->meta.manager);
	316	device_set_state(DEVICE(u), DEVICE_AVAILABLE);
	317	}
	318
c1e1601e LP	319	unit_add_to_dbus_queue(u);
c1e1601e LP	320
25ac040b LP	321	return 0;
	322
	323	fail:
	324	if (delete && u)
	325	unit_free(u);
	326	return r;
	327	}
	328
f94ea366	329	static int device_process_path(Manager m, const char path, bool update_state) {
25ac040b LP	330	int r;
	331	struct udev_device *dev;
	332
	333	assert(m);
	334	assert(path);
	335
	336	if (!(dev = udev_device_new_from_syspath(m->udev, path))) {
	337	log_warning("Failed to get udev device object from udev for path %s.", path);
	338	return -ENOMEM;
	339	}
	340
f94ea366	341	r = device_process_new_device(m, dev, update_state);
25ac040b LP	342	udev_device_unref(dev);
	343	return r;
	344	}
	345
f94ea366 LP	346	static int device_process_removed_device(Manager m, struct udev_device dev) {
	347	const char *sysfs;
	348	char *e;
	349	Unit *u;
	350	Device *d;
	351
	352	assert(m);
	353	assert(dev);
	354
	355	if (!(sysfs = udev_device_get_syspath(dev)))
	356	return -ENOMEM;
	357
	358	assert(sysfs[0] == '/');
2e478a46	359	if (!(e = unit_name_escape_path(sysfs+1, ".device")))
f94ea366 LP	360	return -ENOMEM;
	361
	362	u = manager_get_unit(m, e);
	363	free(e);
	364
	365	if (!u)
	366	return 0;
	367
	368	d = DEVICE(u);
	369	free(d->sysfs);
	370	d->sysfs = NULL;
	371
	372	device_set_state(d, DEVICE_DEAD);
	373	return 0;
	374	}
	375
25ac040b LP	376	static void device_shutdown(Manager *m) {
	377	assert(m);
	378
f94ea366 LP	379	if (m->udev_monitor)
	380	udev_monitor_unref(m->udev_monitor);
	381
25ac040b LP	382	if (m->udev)
	383	udev_unref(m->udev);
	384	}
	385
	386	static int device_enumerate(Manager *m) {
f94ea366	387	struct epoll_event ev;
25ac040b LP	388	int r;
	389	struct udev_enumerate *e = NULL;
	390	struct udev_list_entry item = NULL, first = NULL;
	391
	392	assert(m);
	393
	394	if (!(m->udev = udev_new()))
	395	return -ENOMEM;
	396
f94ea366 LP	397	if (!(m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev"))) {
	398	r = -ENOMEM;
	399	goto fail;
	400	}
	401
	402	if (udev_monitor_enable_receiving(m->udev_monitor) < 0) {
	403	r = -EIO;
	404	goto fail;
	405	}
	406
	407	m->udev_watch.type = WATCH_UDEV;
	408	m->udev_watch.fd = udev_monitor_get_fd(m->udev_monitor);
	409
	410	zero(ev);
	411	ev.events = EPOLLIN;
	412	ev.data.ptr = &m->udev_watch;
	413
	414	if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_watch.fd, &ev) < 0)
	415	return -errno;
	416
25ac040b LP	417	if (!(e = udev_enumerate_new(m->udev))) {
	418	r = -ENOMEM;
	419	goto fail;
	420	}
	421
	422	if (udev_enumerate_scan_devices(e) < 0) {
	423	r = -EIO;
	424	goto fail;
	425	}
	426
	427	first = udev_enumerate_get_list_entry(e);
	428	udev_list_entry_foreach(item, first)
f94ea366	429	device_process_path(m, udev_list_entry_get_name(item), false);
25ac040b LP	430
25ac040b LP	431	udev_enumerate_unref(e);
25ac040b LP	432	return 0;
	433
	434	fail:
	435	if (e)
	436	udev_enumerate_unref(e);
	437
	438	device_shutdown(m);
	439	return r;
5cb5a6ff LP	440	}
5cb5a6ff LP	441
f94ea366 LP	442	void device_fd_event(Manager *m, int events) {
	443	struct udev_device *dev;
	444	int r;
	445	const char *action;
	446
	447	assert(m);
	448	assert(events == EPOLLIN);
	449
f94ea366 LP	450	if (!(dev = udev_monitor_receive_device(m->udev_monitor))) {
	451	log_error("Failed to receive device.");
	452	return;
	453	}
	454
	455	if (!(action = udev_device_get_action(dev))) {
	456	log_error("Failed to get udev action string.");
	457	goto fail;
	458	}
	459
	460	if (streq(action, "remove")) {
	461	if ((r = device_process_removed_device(m, dev)) < 0) {
	462	log_error("Failed to process udev device event: %s", strerror(-r));
	463	goto fail;
	464	}
	465	} else {
	466	if ((r = device_process_new_device(m, dev, true)) < 0) {
	467	log_error("Failed to process udev device event: %s", strerror(-r));
	468	goto fail;
	469	}
	470	}
	471
	472	fail:
	473	udev_device_unref(dev);
	474	}
	475
87f0e418	476	const UnitVTable device_vtable = {
5cb5a6ff LP	477	.suffix = ".device",
5cb5a6ff LP	478
e537352b LP	479	.init = device_init,
e537352b LP	480	.load = unit_load_fragment_and_dropin_optional,
034c6ed7	481	.done = device_done,
f50e0a01 LP	482	.coldplug = device_coldplug,
f50e0a01 LP	483
5cb5a6ff LP	484	.dump = device_dump,
5cb5a6ff LP	485
f50e0a01	486	.active_state = device_active_state,
10a94420	487	.sub_state_to_string = device_sub_state_to_string,
25ac040b	488
f50e0a01 LP	489	.enumerate = device_enumerate,
f50e0a01 LP	490	.shutdown = device_shutdown
5cb5a6ff	491	};