udev_device_has_tag(3) — Linux manual page


UDEV_DEVICE_HAS_TAG(3)       udev_device_has_tag      UDEV_DEVICE_HAS_TAG(3)

NAME         top

       udev_device_has_tag, udev_device_get_devlinks_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

SYNOPSIS         top

       #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);

RETURN VALUE         top

       On success, udev_device_get_devlinks_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.

SEE ALSO         top

       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),

COLOPHON         top

       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)

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