INTRO (9) NetBSD Kernel Developer's Manual INTRO (9) NAME ...

M_TAG (9) NetBSD Kernel Developer’s Manual M_TAG (9)m_tag_prepend(m , t)Prepend the mbuf tag t to the mbuf m. t will become the first tag of the mbuf m. When m isfreed, t will also be freed.m_tag_unlink(m , t)Unlink the mbuf tag t from the mbuf m.m_tag_delete(m , t)The same as m_tag_unlink() followed by m_tag_free().m_tag_delete_chain(m , t)Unlink and free mbuf tags beginning with the mbuf tag t from the mbuf m. If t is NULL,m_tag_delete_chain() unlinks and frees all mbuf tags associated with the mbuf m.m_tag_delete_nonpersistent(m)Unlink and free all non persistent tags associated with the mbuf m.m_tag_find(m , type , t)Find an mbuf tag with type type after the mbuf tag t in the tag chain associated with the mbufm. If t is NULL, search from the first mbuf tag. If an mbuf tag is found, return a pointer to it.Otherwise return NULL.m_tag_copy(t)Copy anmbuf tag t. Return a new mbuf tag on success. Otherwise return NULL.m_tag_copy_chain(to , from)Copy all mbuf tags associated with the mbuf from to the mbuf to. If to already has any mbuftags, they will be unlinked and freed beforehand. Return 1 on success. Otherwise return 0.m_tag_init(m)Initialize mbuf tag chain of the mbuf m.m_tag_first(m)Return the first mbuf tag associated with the mbuf m. Return NULL if no mbuf tags are found.m_tag_next(m , t)Return the next mbuf tag after t associated with the mbuf m. Return NULL if t is the last tag inthe chain.CODE REFERENCESThis section describes places within the NetBSD source tree where actual code implementing the mbuf tagginginterfaces can be found. All pathnames are relative to /usr/src.The mbuf tagging interfaces are implemented within the file sys/kern/uipc_mbuf2.c.The PACKET_TAG_ macros are defined in the file sys/sys/mbuf.h.SEE ALSOintro(9), malloc(9), mbuf(9)BUGSThe semantics of the term "persistent tag" are vague.NetBSD 3.0 September 7, 2004 2