diff options
Diffstat (limited to 'REORG.TODO/sysdeps/unix/sysv/linux/cmsg_nxthdr.c')
-rw-r--r-- | REORG.TODO/sysdeps/unix/sysv/linux/cmsg_nxthdr.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/cmsg_nxthdr.c b/REORG.TODO/sysdeps/unix/sysv/linux/cmsg_nxthdr.c new file mode 100644 index 0000000000..797be3ab68 --- /dev/null +++ b/REORG.TODO/sysdeps/unix/sysv/linux/cmsg_nxthdr.c @@ -0,0 +1,39 @@ +/* Return point to next ancillary data entry in message header. + Copyright (C) 1997-2017 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; +} |