struct udev

struct udev;

Opaque object representing the library context.

udev_ref ()

struct udev *       udev_ref                            (struct udev *udev);

Take a reference of the udev library context.

udev_unref ()

void                udev_unref                          (struct udev *udev);

Drop a reference of the udev library context. If the refcount reaches zero, the resources of the context will be released.

udev_new ()

struct udev *       udev_new                            (void);

Create udev library context. This reads the udev configuration file, and fills in the default values.

The initial refcount is 1, and needs to be decremented to release the resources of the udev library context.

udev_set_log_fn ()

void                udev_set_log_fn                     (struct udev *udev,
                                                         void (*log_fn) (struct udev *udev, int priority, const char *file, int line, const char *fn, const char *format, va_list args));

The built-in logging writes to stderr. It can be overridden by a custom function, to plug log messages into the users' logging functionality.

udev_get_log_priority ()

int                 udev_get_log_priority               (struct udev *udev);

The initial logging priority is read from the udev config file at startup.

udev_set_log_priority ()

void                udev_set_log_priority               (struct udev *udev,
                                                         int priority);

Set the current logging priority. The value controls which messages are logged.

udev_get_sys_path ()

const char *        udev_get_sys_path                   (struct udev *udev);

Retrieve the sysfs mount point. The default is "/sys". For testing purposes, it can be overridden with the environment variable SYSFS_PATH.

udev_get_dev_path ()

const char *        udev_get_dev_path                   (struct udev *udev);

Retrieve the device directory path. The default value is "/dev", the actual value may be overridden in the udev configuration file.

udev_get_run_path ()

const char *        udev_get_run_path                   (struct udev *udev);

Retrieve the udev runtime directory path. The default is "/run/udev".

udev_get_userdata ()

void *              udev_get_userdata                   (struct udev *udev);

Retrieve stored data pointer from library context. This might be useful to access from callbacks like a custom logging function.

udev_set_userdata ()

void                udev_set_userdata                   (struct udev *udev,
                                                         void *userdata);

Store custom userdata in the library context.