ioctl MEDIA_IOC_ENUM_ENTITIES &manvol; MEDIA_IOC_ENUM_ENTITIES Enumerate entities and their properties int ioctl int fd int request struct media_entity_desc *argp fd File descriptor returned by open(). request MEDIA_IOC_ENUM_ENTITIES argp To query the attributes of an entity, applications set the id field of a &media-entity-desc; structure and call the MEDIA_IOC_ENUM_ENTITIES ioctl with a pointer to this structure. The driver fills the rest of the structure or returns an &EINVAL; when the id is invalid. Entities can be enumerated by or'ing the id with the MEDIA_ENT_ID_FLAG_NEXT flag. The driver will return information about the entity with the smallest id strictly larger than the requested one ('next entity'), or the &EINVAL; if there is none. Entity IDs can be non-contiguous. Applications must not try to enumerate entities by calling MEDIA_IOC_ENUM_ENTITIES with increasing id's until they get an error. __u32 id Entity id, set by the application. When the id is or'ed with MEDIA_ENT_ID_FLAG_NEXT, the driver clears the flag and returns the first entity with a larger id. char name[32] Entity name as an UTF-8 NULL-terminated string. __u32 type Entity type, see for details. __u32 revision Entity revision. Always zero (obsolete) __u32 flags Entity flags, see for details. __u32 group_id Entity group ID. Always zero (obsolete) __u16 pads Number of pads __u16 links Total number of outbound links. Inbound links are not counted in this field. union struct dev Valid for (sub-)devices that create a single device node. __u32 major Device node major number. __u32 minor Device node minor number. __u8 raw[184] &return-value; EINVAL The &media-entity-desc; id references a non-existing entity.