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NAME | SYNOPSIS | RETURN VALUE | SEE ALSO | COLOPHON |
UDEV_DEVICE_HAS_TAG(3) udev_device_has_tag UDEV_DEVICE_HAS_TAG(3)
udev_device_has_tag, udev_device_get_devlinks_list_entry,
udev_device_get_properties_list_entry,
udev_device_get_tags_list_entry, udev_device_get_sysattr_list_entry,
udev_device_get_property_value, udev_device_get_sysattr_value,
udev_device_set_sysattr_value - Retrieve or set device attributes
#include <libudev.h>
struct udev_list_entry
*udev_device_get_devlinks_list_entry(struct udev_device *udev_device);
struct udev_list_entry
*udev_device_get_properties_list_entry(struct udev_device *udev_device);
struct udev_list_entry
*udev_device_get_tags_list_entry(struct udev_device *udev_device);
struct udev_list_entry
*udev_device_get_sysattr_list_entry(struct udev_device *udev_device);
const char
*udev_device_get_property_value(struct udev_device *udev_device,
const char *key);
int udev_device_has_tag(struct udev_device *udev_device,
const char *tag);
const char
*udev_device_get_sysattr_value(struct udev_device *udev_device,
const char *sysattr);
int udev_device_set_sysattr_value(struct udev_device *udev_device,
const char *sysattr,
const char *value);
On success, udev_device_get_devlinks_list_entry(),
udev_device_get_properties_list_entry(),
udev_device_get_tags_list_entry() and
udev_device_get_sysattr_list_entry() return a pointer to the first
entry of the retrieved list. If that list is empty, or if an error
occurred, NULL is returned.
On success, udev_device_get_property_value() and
udev_device_get_sysattr_value() return a pointer to a constant string
of the requested value. On error, NULL is returned. Attributes that
may contain NUL bytes should not be retrieved with
udev_device_get_sysattr_value(); instead, read them directly from the
files within the device's syspath.
On success, udev_device_set_sysattr_value() returns an integer
greater than, or equal to, 0. On failure, a negative error code is
returned. Values that contain NUL bytes should not be set with this
function; instead, write them directly to the files within the
device's syspath.
On success, udev_device_has_tag() returns 1 or 0, depending on
whether the device has the given tag or not. On failure, a negative
error code is returned.
udev_new(3), udev_device_new_from_syspath(3),
udev_device_get_syspath(3), udev_enumerate_new(3),
udev_monitor_new_from_netlink(3), udev_list_entry(3), systemd(1),
This page is part of the systemd (systemd system and service manager)
project. Information about the project can be found at
⟨http://www.freedesktop.org/wiki/Software/systemd⟩. If you have a bug
report for this manual page, see
⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩. This
page was obtained from the project's upstream Git repository
⟨https://github.com/systemd/systemd.git⟩ on 2020-08-13. (At that
time, the date of the most recent commit that was found in the repos‐
itory was 2020-08-11.) If you discover any rendering problems in
this HTML version of the page, or you believe there is a better or
more up-to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not part
of the original manual page), send a mail to man-pages@man7.org
systemd 246 UDEV_DEVICE_HAS_TAG(3)
Pages that refer to this page: udev_device_get_action(3) , udev_device_get_devnode(3) , udev_device_get_devnum(3) , udev_device_get_devpath(3) , udev_device_get_devtype(3) , udev_device_get_driver(3) , udev_device_get_is_initialized(3) , udev_device_get_parent(3) , udev_device_get_parent_with_subsystem_devtype(3) , udev_device_get_subsystem(3) , udev_device_get_sysname(3) , udev_device_get_sysnum(3) , udev_device_get_syspath(3) , udev_device_get_udev(3) , udev_device_new_from_device_id(3) , udev_device_new_from_devnum(3) , udev_device_new_from_environment(3) , udev_device_new_from_subsystem_sysname(3) , udev_device_new_from_syspath(3) , udev_device_ref(3) , udev_device_unref(3) , 30-systemd-environment-d-generator(7) , systemd.directives(7) , systemd.index(7)