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