запросить свойства устройства (query device properties)
Дубль
(статьи:
udev_device_get_action - запросить свойства устройства )
Имя (Name)
udev_device_get_syspath, udev_device_get_sysname,
udev_device_get_sysnum, udev_device_get_devpath,
udev_device_get_devnode, udev_device_get_devnum,
udev_device_get_devtype, udev_device_get_subsystem,
udev_device_get_driver, udev_device_get_udev,
udev_device_get_parent,
udev_device_get_parent_with_subsystem_devtype,
udev_device_get_is_initialized, udev_device_get_action - Query
device properties
Синопсис (Synopsis)
#include <libudev.h>
const char
*udev_device_get_syspath(struct udev_device *udev_device);
const char
*udev_device_get_sysname(struct udev_device *udev_device);
const char
*udev_device_get_sysnum(struct udev_device *udev_device);
const char
*udev_device_get_devpath(struct udev_device *udev_device);
const char
*udev_device_get_devnode(struct udev_device *udev_device);
dev_t udev_device_get_devnum(struct udev_device *udev_device);
const char
*udev_device_get_devtype(struct udev_device *udev_device);
const char
*udev_device_get_subsystem(struct udev_device *udev_device);
const char
*udev_device_get_driver(struct udev_device *udev_device);
struct udev
*udev_device_get_udev(struct udev_device *udev_device);
struct udev_device
*udev_device_get_parent(struct udev_device *udev_device);
struct udev_device
*udev_device_get_parent_with_subsystem_devtype(struct udev_device *udev_device,
const char *subsystem,
const char *devtype);
int
udev_device_get_is_initialized(struct udev_device *udev_device);
const char
*udev_device_get_action(struct udev_device *udev_device);
Возвращаемое значение (Return value)
On success, udev_device_get_syspath(), udev_device_get_sysname(),
udev_device_get_sysnum(), udev_device_get_devpath(),
udev_device_get_devnode(), udev_device_get_devtype(),
udev_device_get_subsystem(), udev_device_get_driver() and
udev_device_get_action() return a pointer to a constant string
that describes the requested property. The lifetime of this
string is bound to the device it was requested on. On failure,
each function may return NULL.
On success, udev_device_get_devnum() returns the device type of
the passed device. On failure, a device type with minor and major
number set to 0 is returned.
udev_device_get_udev() always returns a valid pointer to the udev
context that this device belongs to.
On success, udev_device_get_parent() and
udev_device_get_parent_with_subsystem_devtype() return a pointer
to the parent device. No additional reference to this device is
acquired, but the child device owns a reference to such a parent
device. On failure, NULL is returned.
On success, udev_device_get_is_initialized() returns either 1 or
0, depending on whether the passed device has already been
initialized by udev or not. On failure, a negative error code is
returned. Note that devices for which no udev rules are defined
are never reported initialized.
Смотри также (See also)
udev_new(3), udev_device_new_from_syspath(3),
udev_device_has_tag(3), udev_enumerate_new(3),
udev_monitor_new_from_netlink(3), udev_list_entry(3), systemd(1)
