diff options
Diffstat (limited to 'sys/net')
| -rw-r--r-- | sys/net/if.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/sys/net/if.c b/sys/net/if.c index 301b1007507..6519d86152f 100644 --- a/sys/net/if.c +++ b/sys/net/if.c @@ -1,4 +1,4 @@ -/* $OpenBSD: if.c,v 1.16 1998/03/25 07:37:29 deraadt Exp $ */ +/* $OpenBSD: if.c,v 1.17 1998/08/04 20:57:19 millert Exp $ */ /* $NetBSD: if.c,v 1.35 1996/05/07 05:26:04 thorpej Exp $ */ /* @@ -588,6 +588,14 @@ ifconf(cmd, data) struct ifreq ifr, *ifrp; int space = ifc->ifc_len, error = 0; + /* If ifc->ifc_len is 0, fill it in with the needed size and return. */ + if (space == 0) { + for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) + space += sizeof (ifr); + ifc->ifc_len = space; + return(0); + } + ifrp = ifc->ifc_req; for (ifp = ifnet.tqh_first; space >= sizeof (ifr) && ifp != 0; ifp = ifp->if_list.tqe_next) { |