diff options
Diffstat (limited to 'sys/kern/uipc_socket2.c')
| -rw-r--r-- | sys/kern/uipc_socket2.c | 39 |
1 files changed, 38 insertions, 1 deletions
diff --git a/sys/kern/uipc_socket2.c b/sys/kern/uipc_socket2.c index e1ea890769f..d7f6702fedd 100644 --- a/sys/kern/uipc_socket2.c +++ b/sys/kern/uipc_socket2.c @@ -1,4 +1,4 @@ -/* $OpenBSD: uipc_socket2.c,v 1.10 1999/02/19 15:06:52 millert Exp $ */ +/* $OpenBSD: uipc_socket2.c,v 1.11 1999/12/08 06:50:17 itojun Exp $ */ /* $NetBSD: uipc_socket2.c,v 1.11 1996/02/04 02:17:55 christos Exp $ */ /* @@ -778,3 +778,40 @@ sbdroprecord(sb) } while ((m = mn) != NULL); } } + +/* + * Create a "control" mbuf containing the specified data + * with the specified type for presentation on a socket buffer. + */ +struct mbuf * +sbcreatecontrol(p, size, type, level) + caddr_t p; + register int size; + int type, level; +{ + register struct cmsghdr *cp; + struct mbuf *m; + + if (size + sizeof(*cp) > MCLBYTES) { + printf("sbcreatecontrol: message too large %d\n", size); + return NULL; + } + + if ((m = m_get(M_DONTWAIT, MT_CONTROL)) == NULL) + return ((struct mbuf *) NULL); + if (size + sizeof(*cp) > MLEN) { + MCLGET(m, M_DONTWAIT); + if ((m->m_flags & M_EXT) == 0) { + m_free(m); + return NULL; + } + } + cp = mtod(m, struct cmsghdr *); + bcopy(p, CMSG_DATA(cp), size); + size += sizeof(*cp); + m->m_len = size; + cp->cmsg_len = size; + cp->cmsg_level = level; + cp->cmsg_type = type; + return (m); +} |