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authorLennart Poettering <lennart@poettering.net>2010-01-28 06:46:33 +0100
committerLennart Poettering <lennart@poettering.net>2010-01-28 06:46:33 +0100
commit25ac040b489a7bf9c8608308a721d32e20a22911 (patch)
tree3ee812dd62c015a5facdae1e8a9ad08c7b724fe4 /device.c
parent7824bbebe329eea611b809e2fff3e6df4073a465 (diff)
add basic udev device enumeration module
Diffstat (limited to 'device.c')
-rw-r--r--device.c211
1 files changed, 206 insertions, 5 deletions
diff --git a/device.c b/device.c
index b8bab4b02d..22b0f6085e 100644
--- a/device.c
+++ b/device.c
@@ -1,14 +1,18 @@
/*-*- Mode: C; c-basic-offset: 8 -*-*/
+#include <errno.h>
+#include <libudev.h>
+
#include "unit.h"
#include "device.h"
#include "strv.h"
+#include "log.h"
static void device_done(Unit *u) {
Device *d = DEVICE(u);
assert(d);
- strv_free(d->sysfs);
+ free(d->sysfs);
}
static void device_dump(Unit *u, FILE *f, const char *prefix) {
@@ -18,13 +22,207 @@ static void device_dump(Unit *u, FILE *f, const char *prefix) {
[DEVICE_AVAILABLE] = "available"
};
- Device *s = DEVICE(u);
+ Device *d = DEVICE(u);
- assert(s);
+ assert(d);
fprintf(f,
- "%sDevice State: %s\n",
- prefix, state_table[s->state]);
+ "%sDevice State: %s\n"
+ "%sSysfs Path: %s\n",
+ prefix, state_table[d->state],
+ prefix, d->sysfs);
+}
+
+static int device_add_escaped_name(Unit *u, const char *dn) {
+ 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);
+ free(e);
+
+ if (r < 0 && r != -EEXIST)
+ return r;
+
+ return 0;
+}
+
+static int device_process_device(Manager *m, struct udev_device *dev) {
+ 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 (!(u->meta.description = strdup(model))) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ } else {
+ delete = false;
+ free(e);
+ }
+
+ if (dn)
+ if ((r = device_add_escaped_name(u, dn)) < 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))) < 0)
+ goto fail;
+
+ if (names) {
+ FOREACH_WORD(w, l, names, state) {
+ if (!(e = strndup(w, l)))
+ goto fail;
+
+ r = unit_add_name(u, e);
+ free(e);
+
+ if (r < 0 && r != -EEXIST)
+ goto fail;
+ }
+ }
+
+
+ if (set_isempty(u->meta.names)) {
+ r = -EEXIST;
+ goto fail;
+ }
+
+ if (wants) {
+ FOREACH_WORD(w, l, wants, state) {
+ if (!(e = strndup(w, l)))
+ goto fail;
+
+ r = unit_add_dependency_by_name(u, UNIT_WANTS, e);
+ free(e);
+
+ if (r < 0)
+ goto fail;
+ }
+ }
+
+ unit_add_to_load_queue(u);
+ return 0;
+
+fail:
+ if (delete && u)
+ unit_free(u);
+ return r;
+}
+
+static int device_process_path(Manager *m, const char *path) {
+ 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_device(m, dev);
+ udev_device_unref(dev);
+ return r;
+}
+
+static void device_shutdown(Manager *m) {
+ assert(m);
+
+ if (m->udev)
+ udev_unref(m->udev);
+}
+
+static int device_enumerate(Manager *m) {
+ 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 (!(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));
+
+ udev_enumerate_unref(e);
+
+ return 0;
+
+fail:
+ if (e)
+ udev_enumerate_unref(e);
+
+ device_shutdown(m);
+ return r;
}
static UnitActiveState device_active_state(Unit *u) {
@@ -38,5 +236,8 @@ const UnitVTable device_vtable = {
.done = device_done,
.dump = device_dump,
+ .enumerate = device_enumerate,
+ .shutdown = device_shutdown,
+
.active_state = device_active_state
};