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https://github.com/systemd/systemd.git
synced 2024-12-22 17:35:35 +03:00
add basic udev device enumeration module
This commit is contained in:
parent
7824bbebe3
commit
25ac040b48
4
Makefile
4
Makefile
@ -1,5 +1,5 @@
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CFLAGS=-Wall -Wextra -O0 -g -pipe -D_GNU_SOURCE -fdiagnostics-show-option -Wno-unused-parameter -DUNIT_PATH=\"/tmp/does/not/exist\"
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LIBS=-lrt -lcap
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CFLAGS=-Wall -Wextra -O0 -g -pipe -D_GNU_SOURCE -fdiagnostics-show-option -Wno-unused-parameter -DUNIT_PATH=\"/tmp/does/not/exist\" `pkg-config --cflags libudev`
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LIBS=-lrt -lcap `pkg-config --libs libudev`
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COMMON= \
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unit.o \
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211
device.c
211
device.c
@ -1,14 +1,18 @@
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/*-*- Mode: C; c-basic-offset: 8 -*-*/
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#include <errno.h>
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#include <libudev.h>
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#include "unit.h"
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#include "device.h"
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#include "strv.h"
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#include "log.h"
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static void device_done(Unit *u) {
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Device *d = DEVICE(u);
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assert(d);
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strv_free(d->sysfs);
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free(d->sysfs);
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}
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static void device_dump(Unit *u, FILE *f, const char *prefix) {
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@ -18,13 +22,207 @@ static void device_dump(Unit *u, FILE *f, const char *prefix) {
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[DEVICE_AVAILABLE] = "available"
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};
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Device *s = DEVICE(u);
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Device *d = DEVICE(u);
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assert(s);
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assert(d);
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fprintf(f,
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"%sDevice State: %s\n",
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prefix, state_table[s->state]);
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"%sDevice State: %s\n"
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"%sSysfs Path: %s\n",
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prefix, state_table[d->state],
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prefix, d->sysfs);
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}
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static int device_add_escaped_name(Unit *u, const char *dn) {
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char *e;
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int r;
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assert(u);
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assert(dn);
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assert(dn[0] == '/');
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if (!(e = unit_name_escape_path(dn+1, ".device")))
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return -ENOMEM;
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r = unit_add_name(u, e);
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free(e);
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if (r < 0 && r != -EEXIST)
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return r;
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return 0;
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}
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static int device_process_device(Manager *m, struct udev_device *dev) {
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const char *dn, *names, *wants, *sysfs;
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Unit *u = NULL;
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int r;
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char *e, *w, *state;
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size_t l;
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bool delete;
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struct udev_list_entry *item = NULL, *first = NULL;
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assert(m);
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/* Check whether this entry is even relevant for us. */
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dn = udev_device_get_devnode(dev);
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names = udev_device_get_property_value(dev, "SYSTEMD_NAMES");
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wants = udev_device_get_property_value(dev, "SYSTEMD_WANTS");
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if (!dn && !names && !wants)
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return 0;
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/* Ok, seems kinda interesting. Now, let's see if this one
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* already exists. */
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if (!(sysfs = udev_device_get_syspath(dev)))
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return -ENOMEM;
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assert(sysfs[0] == '/');
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if (!(e = unit_name_escape_path(sysfs+1, ".device")))
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return -ENOMEM;
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if (!(u = manager_get_unit(m, e))) {
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const char *model;
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delete = true;
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if (!(u = unit_new(m))) {
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free(e);
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return -ENOMEM;
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}
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r = unit_add_name(u, e);
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free(e);
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if (r < 0)
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goto fail;
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if (!(DEVICE(u)->sysfs = strdup(sysfs))) {
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r = -ENOMEM;
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goto fail;
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}
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if ((model = udev_device_get_property_value(dev, "ID_MODEL_FROM_DATABASE")) ||
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(model = udev_device_get_property_value(dev, "ID_MODEL")))
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if (!(u->meta.description = strdup(model))) {
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r = -ENOMEM;
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goto fail;
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}
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} else {
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delete = false;
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free(e);
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}
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if (dn)
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if ((r = device_add_escaped_name(u, dn)) < 0)
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goto fail;
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first = udev_device_get_devlinks_list_entry(dev);
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udev_list_entry_foreach(item, first)
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if ((r = device_add_escaped_name(u, udev_list_entry_get_name(item))) < 0)
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goto fail;
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if (names) {
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FOREACH_WORD(w, l, names, state) {
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if (!(e = strndup(w, l)))
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goto fail;
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r = unit_add_name(u, e);
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free(e);
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if (r < 0 && r != -EEXIST)
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goto fail;
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}
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}
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if (set_isempty(u->meta.names)) {
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r = -EEXIST;
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goto fail;
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}
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if (wants) {
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FOREACH_WORD(w, l, wants, state) {
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if (!(e = strndup(w, l)))
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goto fail;
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r = unit_add_dependency_by_name(u, UNIT_WANTS, e);
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free(e);
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if (r < 0)
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goto fail;
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}
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}
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unit_add_to_load_queue(u);
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return 0;
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fail:
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if (delete && u)
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unit_free(u);
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return r;
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}
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static int device_process_path(Manager *m, const char *path) {
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int r;
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struct udev_device *dev;
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assert(m);
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assert(path);
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if (!(dev = udev_device_new_from_syspath(m->udev, path))) {
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log_warning("Failed to get udev device object from udev for path %s.", path);
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return -ENOMEM;
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}
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r = device_process_device(m, dev);
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udev_device_unref(dev);
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return r;
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}
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static void device_shutdown(Manager *m) {
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assert(m);
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if (m->udev)
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udev_unref(m->udev);
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}
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static int device_enumerate(Manager *m) {
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int r;
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struct udev_enumerate *e = NULL;
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struct udev_list_entry *item = NULL, *first = NULL;
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assert(m);
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if (!(m->udev = udev_new()))
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return -ENOMEM;
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if (!(e = udev_enumerate_new(m->udev))) {
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r = -ENOMEM;
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goto fail;
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}
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if (udev_enumerate_scan_devices(e) < 0) {
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r = -EIO;
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goto fail;
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}
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first = udev_enumerate_get_list_entry(e);
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udev_list_entry_foreach(item, first)
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device_process_path(m, udev_list_entry_get_name(item));
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udev_enumerate_unref(e);
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return 0;
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fail:
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if (e)
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udev_enumerate_unref(e);
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device_shutdown(m);
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return r;
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}
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static UnitActiveState device_active_state(Unit *u) {
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@ -38,5 +236,8 @@ const UnitVTable device_vtable = {
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.done = device_done,
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.dump = device_dump,
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.enumerate = device_enumerate,
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.shutdown = device_shutdown,
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.active_state = device_active_state
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};
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2
device.h
2
device.h
@ -21,7 +21,7 @@ struct Device {
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DeviceState state;
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/* A single device can be created by multiple sysfs objects */
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char **sysfs;
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char *sysfs;
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};
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extern const UnitVTable device_vtable;
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