Import glibc-mainline for 2006-08-16

git-svn-id: svn://svn.eglibc.org/fsf/trunk@4 7b3dc134-2b1b-0410-93df-9e9f96275f8d

1 files changed, 39 insertions, 0 deletions

diff --git a/libc/sysdeps/unix/sysv/linux/cmsg_nxthdr.c b/libc/sysdeps/unix/sysv/linux/cmsg_nxthdr.c
new file mode 100644
index 000000000..b7de285e3
--- /dev/null
+++ b/libc/sysdeps/unix/sysv/linux/cmsg_nxthdr.c
@@ -0,0 +1,39 @@
+/* Return point to next ancillary data entry in message header.
+   Copyright (C) 1997, 1998, 2001 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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#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;
+}