[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 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, 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
6326a423 LP	156	static bool devnode_is_api(const char *node) {
	157	unsigned i;
	158
	159	static const char * const table[] = {
	160	"/dev/null",
	161	"/dev/zero",
	162	"/dev/urandom",
	163	"/dev/random",
	164	"/dev/port",
	165	"/dev/oldmem",
	166	"/dev/full",
	167	"/dev/kmsg",
	168	"/dev/mem"
	169	};
	170
	171	for (i = 0; i < ELEMENTSOF(table); i++)
	172	if (streq(table[i], node))
	173	return true;
	174
	175	return false;
	176	}
	177
f94ea366	178	static int device_process_new_device(Manager m, struct udev_device dev, bool update_state) {
aab14b13	179	const char dn, names, wants, sysfs, expose, model;
25ac040b LP	180	Unit *u = NULL;
25ac040b LP	181	int r;
aab14b13	182	char w, state;
25ac040b LP	183	size_t l;
	184	bool delete;
	185	struct udev_list_entry item = NULL, first = NULL;
	186
	187	assert(m);
	188
7f275a9f LP	189	if (!(sysfs = udev_device_get_syspath(dev)))
	190	return -ENOMEM;
	191
25ac040b LP	192	/* Check whether this entry is even relevant for us. */
25ac040b LP	193	dn = udev_device_get_devnode(dev);
7f275a9f	194	expose = udev_device_get_property_value(dev, "SYSTEMD_EXPOSE");
25ac040b LP	195	names = udev_device_get_property_value(dev, "SYSTEMD_NAMES");
	196	wants = udev_device_get_property_value(dev, "SYSTEMD_WANTS");
	197
7f275a9f LP	198	if (expose) {
	199	int b;
	200
	201	if ((b = parse_boolean(expose)) < 0) {
	202	log_error("Failed to parse SYSTEMD_EXPOSE udev property for device %s: %s", sysfs, expose);
	203	return 0;
	204	}
	205
	206	if (!b)
	207	return 0;
	208	} else
6326a423	209	if ((!dn \|\| devnode_is_api(dn)) && !names && !wants)
7f275a9f	210	return 0;
25ac040b LP	211
	212	/* Ok, seems kinda interesting. Now, let's see if this one
	213	* already exists. */
	214
aab14b13 LP	215	if ((r = device_find_escape_name(m, sysfs, &u)) < 0)
aab14b13 LP	216	return r;
25ac040b	217
aab14b13 LP	218	if (r == 0 && dn)
	219	if ((r = device_find_escape_name(m, dn, &u)) < 0)
	220	return r;
25ac040b	221
aab14b13 LP	222	if (r == 0) {
	223	first = udev_device_get_devlinks_list_entry(dev);
	224	udev_list_entry_foreach(item, first) {
	225	if ((r = device_find_escape_name(m, udev_list_entry_get_name(item), &u)) < 0)
	226	return r;
25ac040b	227
aab14b13 LP	228	if (r > 0)
aab14b13 LP	229	break;
25ac040b	230	}
aab14b13 LP	231	}
	232
	233	/* FIXME: this needs proper merging */
	234
	235	assert((r > 0) == !!u);
	236
	237	/* If this is a different unit, then let's not merge things */
	238	if (u && DEVICE(u)->sysfs && !streq(DEVICE(u)->sysfs, sysfs))
	239	u = NULL;
25ac040b	240
aab14b13 LP	241	if (!u) {
	242	delete = true;
	243
	244	if (!(u = unit_new(m)))
	245	return -ENOMEM;
25ac040b	246
aab14b13	247	if ((r = device_add_escaped_name(u, sysfs, true)) < 0)
25ac040b LP	248	goto fail;
25ac040b LP	249
e537352b LP	250	unit_add_to_load_queue(u);
	251	} else
	252	delete = false;
	253
	254	if (!(DEVICE(u)->sysfs))
25ac040b LP	255	if (!(DEVICE(u)->sysfs = strdup(sysfs))) {
	256	r = -ENOMEM;
	257	goto fail;
	258	}
	259
25ac040b	260	if (dn)
2e478a46	261	if ((r = device_add_escaped_name(u, dn, true)) < 0)
25ac040b LP	262	goto fail;
	263
	264	first = udev_device_get_devlinks_list_entry(dev);
	265	udev_list_entry_foreach(item, first)
2e478a46	266	if ((r = device_add_escaped_name(u, udev_list_entry_get_name(item), false)) < 0)
25ac040b LP	267	goto fail;
25ac040b LP	268
aab14b13 LP	269	if ((model = udev_device_get_property_value(dev, "ID_MODEL_FROM_DATABASE")) \|\|
	270	(model = udev_device_get_property_value(dev, "ID_MODEL"))) {
	271	if ((r = unit_set_description(u, model)) < 0)
	272	goto fail;
	273	} else if (dn)
	274	if ((r = unit_set_description(u, dn)) < 0)
	275	goto fail;
	276
	277	/* We don't remove names that are gone. But that should be
	278	* fine and should probably be fixed only on a configuration
	279	* refresh. */
	280
25ac040b LP	281	if (names) {
25ac040b LP	282	FOREACH_WORD(w, l, names, 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_name(u, e);
	291	free(e);
	292
	293	if (r < 0 && r != -EEXIST)
	294	goto fail;
	295	}
	296	}
	297
25ac040b LP	298	if (wants) {
25ac040b LP	299	FOREACH_WORD(w, l, wants, state) {
aab14b13 LP	300	char *e;
aab14b13 LP	301
b866264a LP	302	if (!(e = strndup(w, l))) {
b866264a LP	303	r = -ENOMEM;
25ac040b	304	goto fail;
b866264a	305	}
25ac040b	306
9e2f7c11	307	r = unit_add_dependency_by_name(u, UNIT_WANTS, NULL, e);
25ac040b LP	308	free(e);
	309
	310	if (r < 0)
	311	goto fail;
	312	}
	313	}
	314
f94ea366 LP	315	if (update_state) {
	316	manager_dispatch_load_queue(u->meta.manager);
	317	device_set_state(DEVICE(u), DEVICE_AVAILABLE);
	318	}
	319
c1e1601e LP	320	unit_add_to_dbus_queue(u);
c1e1601e LP	321
25ac040b LP	322	return 0;
	323
	324	fail:
	325	if (delete && u)
	326	unit_free(u);
	327	return r;
	328	}
	329
f94ea366	330	static int device_process_path(Manager m, const char path, bool update_state) {
25ac040b LP	331	int r;
	332	struct udev_device *dev;
	333
	334	assert(m);
	335	assert(path);
	336
	337	if (!(dev = udev_device_new_from_syspath(m->udev, path))) {
	338	log_warning("Failed to get udev device object from udev for path %s.", path);
	339	return -ENOMEM;
	340	}
	341
f94ea366	342	r = device_process_new_device(m, dev, update_state);
25ac040b LP	343	udev_device_unref(dev);
	344	return r;
	345	}
	346
f94ea366 LP	347	static int device_process_removed_device(Manager m, struct udev_device dev) {
	348	const char *sysfs;
	349	char *e;
	350	Unit *u;
	351	Device *d;
	352
	353	assert(m);
	354	assert(dev);
	355
	356	if (!(sysfs = udev_device_get_syspath(dev)))
	357	return -ENOMEM;
	358
	359	assert(sysfs[0] == '/');
9e2f7c11	360	if (!(e = unit_name_build_escape(sysfs+1, NULL, ".device")))
f94ea366 LP	361	return -ENOMEM;
	362
	363	u = manager_get_unit(m, e);
	364	free(e);
	365
	366	if (!u)
	367	return 0;
	368
	369	d = DEVICE(u);
	370	free(d->sysfs);
	371	d->sysfs = NULL;
	372
	373	device_set_state(d, DEVICE_DEAD);
	374	return 0;
	375	}
	376
25ac040b LP	377	static void device_shutdown(Manager *m) {
	378	assert(m);
	379
f94ea366 LP	380	if (m->udev_monitor)
	381	udev_monitor_unref(m->udev_monitor);
	382
25ac040b LP	383	if (m->udev)
	384	udev_unref(m->udev);
	385	}
	386
	387	static int device_enumerate(Manager *m) {
f94ea366	388	struct epoll_event ev;
25ac040b LP	389	int r;
	390	struct udev_enumerate *e = NULL;
	391	struct udev_list_entry item = NULL, first = NULL;
	392
	393	assert(m);
	394
	395	if (!(m->udev = udev_new()))
	396	return -ENOMEM;
	397
f94ea366 LP	398	if (!(m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev"))) {
	399	r = -ENOMEM;
	400	goto fail;
	401	}
	402
	403	if (udev_monitor_enable_receiving(m->udev_monitor) < 0) {
	404	r = -EIO;
	405	goto fail;
	406	}
	407
	408	m->udev_watch.type = WATCH_UDEV;
	409	m->udev_watch.fd = udev_monitor_get_fd(m->udev_monitor);
	410
	411	zero(ev);
	412	ev.events = EPOLLIN;
	413	ev.data.ptr = &m->udev_watch;
	414
	415	if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_watch.fd, &ev) < 0)
	416	return -errno;
	417
9e2f7c11 LP	418	/* if (!(e = udev_enumerate_new(m->udev))) { */
	419	/* r = -ENOMEM; */
	420	/* goto fail; */
	421	/* } */
25ac040b	422
9e2f7c11 LP	423	/* if (udev_enumerate_scan_devices(e) < 0) { */
	424	/* r = -EIO; */
	425	/* goto fail; */
	426	/* } */
25ac040b	427
9e2f7c11 LP	428	/* first = udev_enumerate_get_list_entry(e); */
	429	/* udev_list_entry_foreach(item, first) */
	430	/* device_process_path(m, udev_list_entry_get_name(item), false); */
25ac040b	431
9e2f7c11	432	/* udev_enumerate_unref(e); */
25ac040b LP	433	return 0;
	434
	435	fail:
	436	if (e)
	437	udev_enumerate_unref(e);
	438
	439	device_shutdown(m);
	440	return r;
5cb5a6ff LP	441	}
5cb5a6ff LP	442
f94ea366 LP	443	void device_fd_event(Manager *m, int events) {
	444	struct udev_device *dev;
	445	int r;
	446	const char *action;
	447
	448	assert(m);
	449	assert(events == EPOLLIN);
	450
f94ea366 LP	451	if (!(dev = udev_monitor_receive_device(m->udev_monitor))) {
	452	log_error("Failed to receive device.");
	453	return;
	454	}
	455
	456	if (!(action = udev_device_get_action(dev))) {
	457	log_error("Failed to get udev action string.");
	458	goto fail;
	459	}
	460
	461	if (streq(action, "remove")) {
	462	if ((r = device_process_removed_device(m, dev)) < 0) {
	463	log_error("Failed to process udev device event: %s", strerror(-r));
	464	goto fail;
	465	}
	466	} else {
	467	if ((r = device_process_new_device(m, dev, true)) < 0) {
	468	log_error("Failed to process udev device event: %s", strerror(-r));
	469	goto fail;
	470	}
	471	}
	472
	473	fail:
	474	udev_device_unref(dev);
	475	}
	476
87f0e418	477	const UnitVTable device_vtable = {
5cb5a6ff LP	478	.suffix = ".device",
5cb5a6ff LP	479
9e2f7c11 LP	480	.no_requires = true,
	481	.no_instances = true,
	482
e537352b LP	483	.init = device_init,
e537352b LP	484	.load = unit_load_fragment_and_dropin_optional,
034c6ed7	485	.done = device_done,
f50e0a01 LP	486	.coldplug = device_coldplug,
f50e0a01 LP	487
5cb5a6ff LP	488	.dump = device_dump,
5cb5a6ff LP	489
f50e0a01	490	.active_state = device_active_state,
10a94420	491	.sub_state_to_string = device_sub_state_to_string,
25ac040b	492
f50e0a01 LP	493	.enumerate = device_enumerate,
f50e0a01 LP	494	.shutdown = device_shutdown
5cb5a6ff	495	};