[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);
}

static void device_set_state(Device *d, DeviceState state) {
        DeviceState old_state;
        assert(d);

        if (state == d->state)
                return;

        old_state = d->state;
        d->state = 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;

                if (!(DEVICE(u)->sysfs = strdup(sysfs))) {
                        r = -ENOMEM;
                        goto fail;
                }

                unit_add_to_load_queue(u);
        } else
                delete = false;

        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 = 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);
25ac040b	45	free(d->sysfs);
034c6ed7 LP	46	}
034c6ed7 LP	47
f50e0a01 LP	48	static void device_set_state(Device *d, DeviceState state) {
	49	DeviceState old_state;
	50	assert(d);
5cb5a6ff	51
a90ebccc LP	52	if (state == d->state)
	53	return;
	54
f50e0a01 LP	55	old_state = d->state;
f50e0a01 LP	56	d->state = state;
5cb5a6ff	57
f50e0a01 LP	58	log_debug("%s changed %s → %s", unit_id(UNIT(d)), state_string_table[old_state], state_string_table[state]);
	59
	60	unit_notify(UNIT(d), state_translation_table[old_state], state_translation_table[state]);
	61	}
	62
	63	static int device_coldplug(Unit *u) {
	64	Device *d = DEVICE(u);
	65
	66	assert(d);
	67	assert(d->state == DEVICE_DEAD);
	68
	69	if (d->sysfs)
	70	device_set_state(d, DEVICE_AVAILABLE);
	71
	72	return 0;
	73	}
	74
	75	static void device_dump(Unit u, FILE f, const char *prefix) {
25ac040b	76	Device *d = DEVICE(u);
5cb5a6ff	77
25ac040b	78	assert(d);
5cb5a6ff LP	79
5cb5a6ff LP	80	fprintf(f,
25ac040b LP	81	"%sDevice State: %s\n"
25ac040b LP	82	"%sSysfs Path: %s\n",
f50e0a01 LP	83	prefix, state_string_table[d->state],
	84	prefix, strna(d->sysfs));
	85	}
	86
	87	static UnitActiveState device_active_state(Unit *u) {
	88	assert(u);
	89
	90	return state_translation_table[DEVICE(u)->state];
25ac040b LP	91	}
25ac040b LP	92
2e478a46	93	static int device_add_escaped_name(Unit u, const char dn, bool make_id) {
25ac040b LP	94	char *e;
	95	int r;
	96
	97	assert(u);
	98	assert(dn);
	99	assert(dn[0] == '/');
	100
2e478a46	101	if (!(e = unit_name_escape_path(dn+1, ".device")))
25ac040b LP	102	return -ENOMEM;
	103
	104	r = unit_add_name(u, e);
b08d03ff LP	105
	106	if (r >= 0 && make_id)
	107	unit_choose_id(u, e);
	108
25ac040b LP	109	free(e);
	110
	111	if (r < 0 && r != -EEXIST)
	112	return r;
	113
	114	return 0;
	115	}
	116
aab14b13 LP	117	static int device_find_escape_name(Manager m, const char dn, Unit **_u) {
	118	char *e;
	119	Unit *u;
	120
	121	assert(m);
	122	assert(dn);
	123	assert(dn[0] == '/');
	124	assert(_u);
	125
	126	if (!(e = unit_name_escape_path(dn+1, ".device")))
	127	return -ENOMEM;
	128
	129	u = manager_get_unit(m, e);
	130	free(e);
	131
	132	if (u) {
	133	*_u = u;
	134	return 1;
	135	}
	136
	137	return 0;
	138	}
	139
6326a423 LP	140	static bool devnode_is_api(const char *node) {
	141	unsigned i;
	142
	143	static const char * const table[] = {
	144	"/dev/null",
	145	"/dev/zero",
	146	"/dev/urandom",
	147	"/dev/random",
	148	"/dev/port",
	149	"/dev/oldmem",
	150	"/dev/full",
	151	"/dev/kmsg",
	152	"/dev/mem"
	153	};
	154
	155	for (i = 0; i < ELEMENTSOF(table); i++)
	156	if (streq(table[i], node))
	157	return true;
	158
	159	return false;
	160	}
	161
f94ea366	162	static int device_process_new_device(Manager m, struct udev_device dev, bool update_state) {
aab14b13	163	const char dn, names, wants, sysfs, expose, model;
25ac040b LP	164	Unit *u = NULL;
25ac040b LP	165	int r;
aab14b13	166	char w, state;
25ac040b LP	167	size_t l;
	168	bool delete;
	169	struct udev_list_entry item = NULL, first = NULL;
	170
	171	assert(m);
	172
7f275a9f LP	173	if (!(sysfs = udev_device_get_syspath(dev)))
	174	return -ENOMEM;
	175
25ac040b LP	176	/* Check whether this entry is even relevant for us. */
25ac040b LP	177	dn = udev_device_get_devnode(dev);
7f275a9f	178	expose = udev_device_get_property_value(dev, "SYSTEMD_EXPOSE");
25ac040b LP	179	names = udev_device_get_property_value(dev, "SYSTEMD_NAMES");
	180	wants = udev_device_get_property_value(dev, "SYSTEMD_WANTS");
	181
7f275a9f LP	182	if (expose) {
	183	int b;
	184
	185	if ((b = parse_boolean(expose)) < 0) {
	186	log_error("Failed to parse SYSTEMD_EXPOSE udev property for device %s: %s", sysfs, expose);
	187	return 0;
	188	}
	189
	190	if (!b)
	191	return 0;
	192	} else
6326a423	193	if ((!dn \|\| devnode_is_api(dn)) && !names && !wants)
7f275a9f	194	return 0;
25ac040b LP	195
	196	/* Ok, seems kinda interesting. Now, let's see if this one
	197	* already exists. */
	198
aab14b13 LP	199	if ((r = device_find_escape_name(m, sysfs, &u)) < 0)
aab14b13 LP	200	return r;
25ac040b	201
aab14b13 LP	202	if (r == 0 && dn)
	203	if ((r = device_find_escape_name(m, dn, &u)) < 0)
	204	return r;
25ac040b	205
aab14b13 LP	206	if (r == 0) {
	207	first = udev_device_get_devlinks_list_entry(dev);
	208	udev_list_entry_foreach(item, first) {
	209	if ((r = device_find_escape_name(m, udev_list_entry_get_name(item), &u)) < 0)
	210	return r;
25ac040b	211
aab14b13 LP	212	if (r > 0)
aab14b13 LP	213	break;
25ac040b	214	}
aab14b13 LP	215	}
	216
	217	/* FIXME: this needs proper merging */
	218
	219	assert((r > 0) == !!u);
	220
	221	/* If this is a different unit, then let's not merge things */
	222	if (u && DEVICE(u)->sysfs && !streq(DEVICE(u)->sysfs, sysfs))
	223	u = NULL;
25ac040b	224
aab14b13 LP	225	if (!u) {
	226	delete = true;
	227
	228	if (!(u = unit_new(m)))
	229	return -ENOMEM;
25ac040b	230
aab14b13	231	if ((r = device_add_escaped_name(u, sysfs, true)) < 0)
25ac040b LP	232	goto fail;
	233
	234	if (!(DEVICE(u)->sysfs = strdup(sysfs))) {
	235	r = -ENOMEM;
	236	goto fail;
	237	}
	238
f94ea366	239	unit_add_to_load_queue(u);
aab14b13	240	} else
25ac040b	241	delete = false;
25ac040b LP	242
25ac040b LP	243	if (dn)
2e478a46	244	if ((r = device_add_escaped_name(u, dn, true)) < 0)
25ac040b LP	245	goto fail;
	246
	247	first = udev_device_get_devlinks_list_entry(dev);
	248	udev_list_entry_foreach(item, first)
2e478a46	249	if ((r = device_add_escaped_name(u, udev_list_entry_get_name(item), false)) < 0)
25ac040b LP	250	goto fail;
25ac040b LP	251
aab14b13 LP	252	if ((model = udev_device_get_property_value(dev, "ID_MODEL_FROM_DATABASE")) \|\|
	253	(model = udev_device_get_property_value(dev, "ID_MODEL"))) {
	254	if ((r = unit_set_description(u, model)) < 0)
	255	goto fail;
	256	} else if (dn)
	257	if ((r = unit_set_description(u, dn)) < 0)
	258	goto fail;
	259
	260	/* We don't remove names that are gone. But that should be
	261	* fine and should probably be fixed only on a configuration
	262	* refresh. */
	263
25ac040b LP	264	if (names) {
25ac040b LP	265	FOREACH_WORD(w, l, names, state) {
aab14b13 LP	266	char *e;
aab14b13 LP	267
b866264a LP	268	if (!(e = strndup(w, l))) {
b866264a LP	269	r = -ENOMEM;
25ac040b	270	goto fail;
b866264a	271	}
25ac040b LP	272
	273	r = unit_add_name(u, e);
	274	free(e);
	275
	276	if (r < 0 && r != -EEXIST)
	277	goto fail;
	278	}
	279	}
	280
25ac040b LP	281	if (wants) {
25ac040b LP	282	FOREACH_WORD(w, l, wants, state) {
aab14b13 LP	283	char *e;
aab14b13 LP	284
b866264a LP	285	if (!(e = strndup(w, l))) {
b866264a LP	286	r = -ENOMEM;
25ac040b	287	goto fail;
b866264a	288	}
25ac040b LP	289
	290	r = unit_add_dependency_by_name(u, UNIT_WANTS, e);
	291	free(e);
	292
	293	if (r < 0)
	294	goto fail;
	295	}
	296	}
	297
f94ea366 LP	298	if (update_state) {
	299	manager_dispatch_load_queue(u->meta.manager);
	300	device_set_state(DEVICE(u), DEVICE_AVAILABLE);
	301	}
	302
c1e1601e LP	303	unit_add_to_dbus_queue(u);
c1e1601e LP	304
25ac040b LP	305	return 0;
	306
	307	fail:
	308	if (delete && u)
	309	unit_free(u);
	310	return r;
	311	}
	312
f94ea366	313	static int device_process_path(Manager m, const char path, bool update_state) {
25ac040b LP	314	int r;
	315	struct udev_device *dev;
	316
	317	assert(m);
	318	assert(path);
	319
	320	if (!(dev = udev_device_new_from_syspath(m->udev, path))) {
	321	log_warning("Failed to get udev device object from udev for path %s.", path);
	322	return -ENOMEM;
	323	}
	324
f94ea366	325	r = device_process_new_device(m, dev, update_state);
25ac040b LP	326	udev_device_unref(dev);
	327	return r;
	328	}
	329
f94ea366 LP	330	static int device_process_removed_device(Manager m, struct udev_device dev) {
	331	const char *sysfs;
	332	char *e;
	333	Unit *u;
	334	Device *d;
	335
	336	assert(m);
	337	assert(dev);
	338
	339	if (!(sysfs = udev_device_get_syspath(dev)))
	340	return -ENOMEM;
	341
	342	assert(sysfs[0] == '/');
2e478a46	343	if (!(e = unit_name_escape_path(sysfs+1, ".device")))
f94ea366 LP	344	return -ENOMEM;
	345
	346	u = manager_get_unit(m, e);
	347	free(e);
	348
	349	if (!u)
	350	return 0;
	351
	352	d = DEVICE(u);
	353	free(d->sysfs);
	354	d->sysfs = NULL;
	355
	356	device_set_state(d, DEVICE_DEAD);
	357	return 0;
	358	}
	359
25ac040b LP	360	static void device_shutdown(Manager *m) {
	361	assert(m);
	362
f94ea366 LP	363	if (m->udev_monitor)
	364	udev_monitor_unref(m->udev_monitor);
	365
25ac040b LP	366	if (m->udev)
	367	udev_unref(m->udev);
	368	}
	369
	370	static int device_enumerate(Manager *m) {
f94ea366	371	struct epoll_event ev;
25ac040b LP	372	int r;
	373	struct udev_enumerate *e = NULL;
	374	struct udev_list_entry item = NULL, first = NULL;
	375
	376	assert(m);
	377
	378	if (!(m->udev = udev_new()))
	379	return -ENOMEM;
	380
f94ea366 LP	381	if (!(m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev"))) {
	382	r = -ENOMEM;
	383	goto fail;
	384	}
	385
	386	if (udev_monitor_enable_receiving(m->udev_monitor) < 0) {
	387	r = -EIO;
	388	goto fail;
	389	}
	390
	391	m->udev_watch.type = WATCH_UDEV;
	392	m->udev_watch.fd = udev_monitor_get_fd(m->udev_monitor);
	393
	394	zero(ev);
	395	ev.events = EPOLLIN;
	396	ev.data.ptr = &m->udev_watch;
	397
	398	if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_watch.fd, &ev) < 0)
	399	return -errno;
	400
25ac040b LP	401	if (!(e = udev_enumerate_new(m->udev))) {
	402	r = -ENOMEM;
	403	goto fail;
	404	}
	405
	406	if (udev_enumerate_scan_devices(e) < 0) {
	407	r = -EIO;
	408	goto fail;
	409	}
	410
	411	first = udev_enumerate_get_list_entry(e);
	412	udev_list_entry_foreach(item, first)
f94ea366	413	device_process_path(m, udev_list_entry_get_name(item), false);
25ac040b LP	414
25ac040b LP	415	udev_enumerate_unref(e);
25ac040b LP	416	return 0;
	417
	418	fail:
	419	if (e)
	420	udev_enumerate_unref(e);
	421
	422	device_shutdown(m);
	423	return r;
5cb5a6ff LP	424	}
5cb5a6ff LP	425
f94ea366 LP	426	void device_fd_event(Manager *m, int events) {
	427	struct udev_device *dev;
	428	int r;
	429	const char *action;
	430
	431	assert(m);
	432	assert(events == EPOLLIN);
	433
f94ea366 LP	434	if (!(dev = udev_monitor_receive_device(m->udev_monitor))) {
	435	log_error("Failed to receive device.");
	436	return;
	437	}
	438
	439	if (!(action = udev_device_get_action(dev))) {
	440	log_error("Failed to get udev action string.");
	441	goto fail;
	442	}
	443
	444	if (streq(action, "remove")) {
	445	if ((r = device_process_removed_device(m, dev)) < 0) {
	446	log_error("Failed to process udev device event: %s", strerror(-r));
	447	goto fail;
	448	}
	449	} else {
	450	if ((r = device_process_new_device(m, dev, true)) < 0) {
	451	log_error("Failed to process udev device event: %s", strerror(-r));
	452	goto fail;
	453	}
	454	}
	455
	456	fail:
	457	udev_device_unref(dev);
	458	}
	459
87f0e418	460	const UnitVTable device_vtable = {
5cb5a6ff LP	461	.suffix = ".device",
5cb5a6ff LP	462
23a177ef	463	.init = unit_load_fragment_and_dropin_optional,
034c6ed7	464	.done = device_done,
f50e0a01 LP	465	.coldplug = device_coldplug,
f50e0a01 LP	466
5cb5a6ff LP	467	.dump = device_dump,
5cb5a6ff LP	468
f50e0a01	469	.active_state = device_active_state,
25ac040b	470
f50e0a01 LP	471	.enumerate = device_enumerate,
f50e0a01 LP	472	.shutdown = device_shutdown
5cb5a6ff	473	};