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glibc/sysdeps/unix/sysv/linux/cmsg_nxthdr.c
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/* Return point to next ancillary data entry in message header. | |
Copyright (C) 1997-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <stddef.h> | |
#include <sys/socket.h> | |
struct cmsghdr * | |
__cmsg_nxthdr (struct msghdr *mhdr, struct cmsghdr *cmsg) | |
{ | |
if ((size_t) cmsg->cmsg_len < sizeof (struct cmsghdr)) | |
/* The kernel header does this so there may be a reason. */ | |
return NULL; | |
cmsg = (struct cmsghdr *) ((unsigned char *) cmsg | |
+ CMSG_ALIGN (cmsg->cmsg_len)); | |
if ((unsigned char *) (cmsg + 1) > ((unsigned char *) mhdr->msg_control | |
+ mhdr->msg_controllen) | |
|| ((unsigned char *) cmsg + CMSG_ALIGN (cmsg->cmsg_len) | |
> ((unsigned char *) mhdr->msg_control + mhdr->msg_controllen))) | |
/* No more entries. */ | |
return NULL; | |
return cmsg; | |
} |