udev_device_get_devnode(3) — Linux manual page



NAME         top

       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_is_initialized, udev_device_get_action - Query device

SYNOPSIS         top

       #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);

RETURN VALUE         top

       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

SEE ALSO         top

       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),

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 2020-11-01.  (At that
       time, the date of the most recent commit that was found in the repos‐
       itory was 2020-11-01.)  If you discover any rendering problems in
       this HTML version of the page, or you believe there is a better or
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       the original manual page), send a mail to man-pages@man7.org

systemd 247                                       UDEV_DEVICE_GET_SYSPATH(3)

Pages that refer to this page: 30-systemd-environment-d-generator(7)systemd.index(7)