X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=device.c;h=6de7d518c718cfc30496f7a5fb45f9824a25ad2e;hp=ec0a40a4df6561c333226057b5702662e5640a3d;hb=b866264a18095d5302443ab0a95560d973ba4b10;hpb=034c6ed7da5e44bfdde5a5d0da75f7b7a59953b8

diff --git a/device.c b/device.c
index ec0a40a4d..6de7d518c 100644
--- a/device.c
+++ b/device.c
@@ -1,42 +1,394 @@
 /*-*- Mode: C; c-basic-offset: 8 -*-*/
 
-#include "name.h"
+/***
+  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 void device_done(Name *n) {
-        Device *d = DEVICE(n);
+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);
-        strv_free(d->sysfs);
+
+        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 void device_dump(Name *n, FILE *f, const char *prefix) {
+static int device_coldplug(Unit *u) {
+        Device *d = DEVICE(u);
 
-        static const char* const state_table[_DEVICE_STATE_MAX] = {
-                [DEVICE_DEAD] = "dead",
-                [DEVICE_AVAILABLE] = "available"
-        };
+        assert(d);
+        assert(d->state == DEVICE_DEAD);
 
-        Device *s = DEVICE(n);
+        if (d->sysfs)
+                device_set_state(d, DEVICE_AVAILABLE);
 
-        assert(s);
+        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",
-                prefix, state_table[s->state]);
+                "%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_process_new_device(Manager *m, struct udev_device *dev, bool update_state) {
+        const char *dn, *names, *wants, *sysfs;
+        Unit *u = NULL;
+        int r;
+        char *e, *w, *state;
+        size_t l;
+        bool delete;
+        struct udev_list_entry *item = NULL, *first = NULL;
+
+        assert(m);
+
+        /* Check whether this entry is even relevant for us. */
+        dn = udev_device_get_devnode(dev);
+        names = udev_device_get_property_value(dev, "SYSTEMD_NAMES");
+        wants = udev_device_get_property_value(dev, "SYSTEMD_WANTS");
+
+        if (!dn && !names && !wants)
+                return 0;
+
+        /* Ok, seems kinda interesting. Now, let's see if this one
+         * already exists. */
+
+        if (!(sysfs = udev_device_get_syspath(dev)))
+                return -ENOMEM;
+
+        assert(sysfs[0] == '/');
+        if (!(e = unit_name_escape_path(sysfs+1, ".device")))
+                return -ENOMEM;
+
+        if (!(u = manager_get_unit(m, e))) {
+                const char *model;
+
+                delete = true;
+
+                if (!(u = unit_new(m))) {
+                        free(e);
+                        return -ENOMEM;
+                }
+
+                r = unit_add_name(u, e);
+                free(e);
+
+                if (r < 0)
+                        goto fail;
+
+                if (!(DEVICE(u)->sysfs = strdup(sysfs))) {
+                        r = -ENOMEM;
+                        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;
+
+                unit_add_to_load_queue(u);
+        } else {
+                delete = false;
+                free(e);
+        }
+
+        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 (names) {
+                FOREACH_WORD(w, l, names, state) {
+                        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) {
+                        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 NameActiveState device_active_state(Name *n) {
-        return DEVICE(n)->state == DEVICE_DEAD ? NAME_INACTIVE : NAME_ACTIVE;
+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);
 }
 
-const NameVTable device_vtable = {
+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);
+
+        log_debug("got udev event");
+
+        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 = name_load_fragment_and_dropin,
+        .init = unit_load_fragment_and_dropin,
         .done = device_done,
+        .coldplug = device_coldplug,
+
         .dump = device_dump,
 
-        .active_state = device_active_state
+        .active_state = device_active_state,
+
+        .enumerate = device_enumerate,
+        .shutdown = device_shutdown
 };