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c0e45674 | 1 | /* Return point to next ancillary data entry in message header. |
f7a9f785 | 2 | Copyright (C) 1997-2016 Free Software Foundation, Inc. |
c0e45674 UD |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
c0e45674 UD |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
c0e45674 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
c0e45674 | 18 | |
6107639e | 19 | #include <stddef.h> |
c0e45674 UD |
20 | #include <sys/socket.h> |
21 | ||
22 | ||
23 | struct cmsghdr * | |
24 | __cmsg_nxthdr (struct msghdr *mhdr, struct cmsghdr *cmsg) | |
25 | { | |
c0e45674 UD |
26 | if ((size_t) cmsg->cmsg_len < sizeof (struct cmsghdr)) |
27 | /* The kernel header does this so there may be a reason. */ | |
28 | return NULL; | |
29 | ||
dfd2464b UD |
30 | cmsg = (struct cmsghdr *) ((unsigned char *) cmsg |
31 | + CMSG_ALIGN (cmsg->cmsg_len)); | |
ad71126b UD |
32 | if ((unsigned char *) (cmsg + 1) > ((unsigned char *) mhdr->msg_control |
33 | + mhdr->msg_controllen) | |
dfd2464b | 34 | || ((unsigned char *) cmsg + CMSG_ALIGN (cmsg->cmsg_len) |
328c5f65 | 35 | > ((unsigned char *) mhdr->msg_control + mhdr->msg_controllen))) |
c0e45674 UD |
36 | /* No more entries. */ |
37 | return NULL; | |
dfd2464b | 38 | return cmsg; |
c0e45674 | 39 | } |