[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 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,

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