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diff --git a/sysdeps/unix/sysv/linux/bits/socket.h b/sysdeps/unix/sysv/linux/bits/socket.h
new file mode 100644
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+++ b/sysdeps/unix/sysv/linux/bits/socket.h
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+/* System-specific socket constants and types. Linux version.
+ Copyright (C) 1991, 92, 94, 95, 96, 97 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 Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#ifndef _SYS_SOCKET_H
+#error "Never include <bits/socket.h> directly; use <sys/socket.h> instead."
+#endif
+
+
+#include <features.h>
+
+#define __need_size_t
+#define __need_NULL
+#include <stddef.h>
+
+
+__BEGIN_DECLS
+
+/* Types of sockets. */
+enum __socket_type
+{
+ SOCK_STREAM = 1, /* Sequenced, reliable, connection-based
+ byte streams. */
+#define SOCK_STREAM SOCK_STREAM
+ SOCK_DGRAM = 2, /* Connectionless, unreliable datagrams
+ of fixed maximum length. */
+#define SOCK_DGRAM SOCK_DGRAM
+ SOCK_RAW = 3, /* Raw protocol interface. */
+#define SOCK_RAW SOCK_RAW
+ SOCK_RDM = 4, /* Reliably-delivered messages. */
+#define SOCK_RDM SOCK_RDM
+ SOCK_SEQPACKET = 5, /* Sequenced, reliable, connection-based,
+ datagrams of fixed maximum length. */
+#define SOCK_SEQPACKET SOCK_SEQPACKET
+ SOCK_PACKET = 10 /* Linux specific way of getting packets
+ at the dev level. For writing rarp and
+ other similar things on the user level. */
+#define SOCK_PACKET SOCK_PACKET
+};
+
+/* Protocol families. */
+#define PF_UNSPEC 0 /* Unspecified. */
+#define PF_LOCAL 1 /* Local to host (pipes and file-domain). */
+#define PF_UNIX PF_LOCAL /* Old BSD name for PF_LOCAL. */
+#define PF_FILE PF_LOCAL /* POSIX name for PF_LOCAL. */
+#define PF_INET 2 /* IP protocol family. */
+#define PF_AX25 3 /* Amateur Radio AX.25. */
+#define PF_IPX 4 /* Novell Internet Protocol. */
+#define PF_APPLETALK 5 /* Don't use this. */
+#define PF_NETROM 6 /* Amateur radio NetROM. */
+#define PF_BRIDGE 7 /* Multiprotocol bridge. */
+#define PF_AAL5 8 /* Reserved for Werner's ATM. */
+#define PF_X25 9 /* Reserved for X.25 project. */
+#define PF_INET6 10 /* IP version 6. */
+#define PF_MAX 12 /* For now.. */
+
+/* Address families. */
+#define AF_UNSPEC PF_UNSPEC
+#define AF_LOCAL PF_LOCAL
+#define AF_UNIX PF_UNIX
+#define AF_FILE PF_FILE
+#define AF_INET PF_INET
+#define AF_AX25 PF_AX25
+#define AF_IPX PF_IPX
+#define AF_APPLETALK PF_APPLETALK
+#define AF_NETROM PF_NETROM
+#define AF_BRIDGE PF_BRIDGE
+#define AF_AAL5 PF_AAL5
+#define AF_X25 PF_X25
+#define AF_INET6 PF_INET6
+#define AF_MAX PF_MAX
+
+/* Socket level values. Others are defined in the appropriate headers.
+
+ XXX These definitions also should go into the appropriate headers as
+ far as they are available. */
+#define SOL_IPV6 41
+#define SOL_ICMPV6 58
+#define SOL_RAW 255
+#define SOL_AX25 257
+#define SOL_ATALK 258
+#define SOL_NETROM 259
+#define SOL_ROSE 260
+#define SOL_DECNET 261
+#define SOL_X25 262
+
+/* Maximum queue length specifiable by listen. */
+#define SOMAXCONN 128
+
+/* Get the definition of the macro to define the common sockaddr members. */
+#include <bits/sockaddr.h>
+
+/* Structure describing a generic socket address. */
+struct sockaddr
+ {
+ __SOCKADDR_COMMON (sa_); /* Common data: address family and length. */
+ char sa_data[14]; /* Address data. */
+ };
+
+
+/* Bits in the FLAGS argument to `send', `recv', et al. */
+enum
+ {
+ MSG_OOB = 0x01, /* Process out-of-band data. */
+ MSG_PEEK = 0x02, /* Peek at incoming messages. */
+ MSG_DONTROUTE = 0x04, /* Don't use local routing. */
+ MSG_CTRUNC = 0x08, /* Control data lost before delivery. */
+ MSG_PROXY = 0x10 /* Supply or ask second address. */
+ };
+
+
+/* Structure describing messages sent by
+ `sendmsg' and received by `recvmsg'. */
+struct msghdr
+ {
+ __ptr_t msg_name; /* Address to send to/receive from. */
+ int msg_namelen; /* Length of address data. */
+ /* XXX Should be type `size_t' according to POSIX.1g. */
+
+ struct iovec *msg_iov; /* Vector of data to send/receive into. */
+ size_t msg_iovlen; /* Number of elements in the vector. */
+
+ __ptr_t msg_control; /* Ancillary data (eg BSD filedesc passing). */
+ size_t msg_controllen; /* Ancillary data buffer length. */
+ int msg_flags; /* Flags on received message. */
+ };
+
+/* Structure used for storage of ancillary data object information. */
+struct cmsghdr
+ {
+ size_t cmsg_len; /* Length of data in cmsg_data plus length
+ of cmsghdr structure. */
+ int cmsg_level; /* Originating protocol. */
+ int cmsg_type; /* Protocol specific type. */
+#if !defined __STRICT_ANSI__ && defined __GNUC__ && __GNUC__ >= 2
+ unsigned char __cmsg_data[0]; /* Ancillary data. */
+#endif
+ };
+
+/* Ancillary data object manipulation macros. */
+#if !defined __STRICT_ANSI__ && defined __GNUC__ && __GNUC__ >= 2
+# define CMSG_DATA(cmsg) ((cmsg)->__cmsg_data)
+#else
+# define CMSG_DATA(cmsg) ((unsigned char *) ((struct cmsghdr *) (cmsg) + 1))
+#endif
+#define CMSG_NXTHDR(mhdr, cmsg) __cmsg_nxthdr (mhdr, cmsg)
+#define CMSG_FIRSTHDR(mhdr) \
+ ((size_t) (mhdr)->msg_controllen >= sizeof (struct cmsghdr) \
+ ? (struct cmsghdr *) (mhdr)->msg_control : (struct cmsghdr *) NULL)
+#define CMSG_ALIGN(len) (((len) + sizeof (size_t) - 1) \
+ & ~(sizeof (size_t) - 1))
+#define CMSG_SPACE(len) (CMSG_ALIGN (len) \
+ + CMSG_ALIGN (sizeof (struct cmsghdr)))
+#define CMSG_LEN(len) (CMSG_ALIGN (sizeof (struct cmsghdr)) + (len))
+
+#ifndef _EXTERN_INLINE
+# define _EXTERN_INLINE extern __inline
+#endif
+extern struct cmsghdr *__cmsg_nxthdr __P ((struct msghdr *__mhdr,
+ struct cmsghdr *__cmsg));
+_EXTERN_INLINE struct cmsghdr *
+__cmsg_nxthdr (struct msghdr *__mhdr, struct cmsghdr *__cmsg)
+{
+ unsigned char *__p;
+
+ if ((size_t) __cmsg->cmsg_len < sizeof (struct cmsghdr))
+ /* The kernel header does this so there may be a reason. */
+ return NULL;
+
+ __p = (((unsigned char *) __cmsg)
+ + ((__cmsg->cmsg_len + sizeof (long int) - 1) & ~sizeof (long int)));
+ if (__p >= (unsigned char *) __mhdr->msg_control + __mhdr->msg_controllen)
+ /* No more entries. */
+ return NULL;
+ return (struct cmsghdr *) __p;
+}
+
+
+/* Get socket manipulation related informations from kernel headers. */
+#include <asm/socket.h>
+
+
+/* Structure used to manipulate the SO_LINGER option. */
+struct linger
+ {
+ int l_onoff; /* Nonzero to linger on close. */
+ int l_linger; /* Time to linger. */
+ };
+
+__END_DECLS