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/* SPDX-License-Identifier: LGPL-2.1+ */
#include <errno.h>
#include "sd-hwdb.h"
#include "alloc-util.h"
#include "hwdb-util.h"
#include "libudev-list-internal.h"
/**
* SECTION:libudev-hwdb
* @short_description: retrieve properties from the hardware database
*
* Libudev hardware database interface.
*/
/**
* udev_hwdb:
*
* Opaque object representing the hardware database.
*/
struct udev_hwdb {
unsigned n_ref;
sd_hwdb *hwdb;
struct udev_list *properties_list;
};
/**
* udev_hwdb_new:
* @udev: udev library context (unused)
*
* Create a hardware database context to query properties for devices.
*
* Returns: a hwdb context.
**/
_public_ struct udev_hwdb *udev_hwdb_new(struct udev *udev) {
_cleanup_(udev_list_freep) struct udev_list *list = NULL;
_cleanup_(sd_hwdb_unrefp) sd_hwdb *hwdb_internal = NULL;
struct udev_hwdb *hwdb;
int r;
r = sd_hwdb_new(&hwdb_internal);
if (r < 0)
return_with_errno(NULL, r);
list = udev_list_new(true);
if (!list)
return_with_errno(NULL, ENOMEM);
hwdb = new(struct udev_hwdb, 1);
if (!hwdb)
return_with_errno(NULL, ENOMEM);
*hwdb = (struct udev_hwdb) {
.n_ref = 1,
.hwdb = TAKE_PTR(hwdb_internal),
.properties_list = TAKE_PTR(list),
};
return hwdb;
}
static struct udev_hwdb *udev_hwdb_free(struct udev_hwdb *hwdb) {
assert(hwdb);
sd_hwdb_unref(hwdb->hwdb);
udev_list_free(hwdb->properties_list);
return mfree(hwdb);
}
/**
* udev_hwdb_ref:
* @hwdb: context
*
* Take a reference of a hwdb context.
*
* Returns: the passed enumeration context
**/
/**
* udev_hwdb_unref:
* @hwdb: context
*
* Drop a reference of a hwdb context. If the refcount reaches zero,
* all resources of the hwdb context will be released.
*
* Returns: #NULL
**/
DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(struct udev_hwdb, udev_hwdb, udev_hwdb_free);
/**
* udev_hwdb_get_properties_list_entry:
* @hwdb: context
* @modalias: modalias string
* @flags: (unused)
*
* Lookup a matching device in the hardware database. The lookup key is a
* modalias string, whose formats are defined for the Linux kernel modules.
* Examples are: pci:v00008086d00001C2D*, usb:v04F2pB221*. The first entry
* of a list of retrieved properties is returned.
*
* Returns: a udev_list_entry.
*/
_public_ struct udev_list_entry *udev_hwdb_get_properties_list_entry(struct udev_hwdb *hwdb, const char *modalias, unsigned flags) {
const char *key, *value;
struct udev_list_entry *e;
assert_return_errno(hwdb, NULL, EINVAL);
assert_return_errno(modalias, NULL, EINVAL);
udev_list_cleanup(hwdb->properties_list);
SD_HWDB_FOREACH_PROPERTY(hwdb->hwdb, modalias, key, value)
if (!udev_list_entry_add(hwdb->properties_list, key, value))
return_with_errno(NULL, ENOMEM);
e = udev_list_get_entry(hwdb->properties_list);
if (!e)
return_with_errno(NULL, ENODATA);
return e;
}
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