[splint.git] / test / tests2.5 / socket.h

/* System-specific socket constants and types.  Linux version.
   Copyright (C) 1991,92,94,95,96,97,98,99 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 __BITS_SOCKET_H
#define __BITS_SOCKET_H

#if !defined _SYS_SOCKET_H && !defined _NETINET_IN_H
# error "Never include <bits/socket.h> directly; use <sys/socket.h> instead."
#endif

#define	__need_size_t
#define __need_NULL
#include <stddef.h>

#include <limits.h>
#include <sys/types.h>

/* Type for length arguments in socket calls.  */
typedef unsigned int socklen_t;

/* 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 /* Another non-standard 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	/* Appletalk DDP.  */
#define	PF_NETROM	6	/* Amateur radio NetROM.  */
#define	PF_BRIDGE	7	/* Multiprotocol bridge.  */
#define	PF_ATMPVC	8	/* ATM PVCs.  */
#define	PF_X25		9	/* Reserved for X.25 project.  */
#define	PF_INET6	10	/* IP version 6.  */
#define	PF_ROSE		11	/* Amateur Radio X.25 PLP.  */
#define	PF_DECnet	12	/* Reserved for DECnet project.  */
#define	PF_NETBEUI	13	/* Reserved for 802.2LLC project.  */
#define	PF_SECURITY	14	/* Security callback pseudo AF.  */
#define	PF_KEY		15	/* PF_KEY key management API.  */
#define	PF_NETLINK	16
#define	PF_ROUTE	PF_NETLINK /* Alias to emulate 4.4BSD.  */
#define	PF_PACKET	17	/* Packet family.  */
#define	PF_ASH		18	/* Ash.  */
#define	PF_ECONET	19	/* Acorn Econet.  */
#define	PF_ATMSVC	20	/* ATM SVCs.  */
#define	PF_SNA		22	/* Linux SNA Project */
#define PF_IRDA		23	/* IRDA sockets.  */
#define	PF_MAX		32	/* 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_ATMPVC	PF_ATMPVC
#define	AF_X25		PF_X25
#define	AF_INET6	PF_INET6
#define	AF_ROSE		PF_ROSE
#define	AF_DECnet	PF_DECnet
#define	AF_NETBEUI	PF_NETBEUI
#define	AF_SECURITY	PF_SECURITY
#define	AF_KEY		PF_KEY
#define	AF_NETLINK	PF_NETLINK
#define	AF_ROUTE	PF_ROUTE
#define	AF_PACKET	PF_PACKET
#define	AF_ASH		PF_ASH
#define	AF_ECONET	PF_ECONET
#define	AF_ATMSVC	PF_ATMSVC
#define	AF_SNA		PF_SNA
#define AF_IRDA		PF_IRDA
#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_RAW		255
#define SOL_DECNET      261
#define SOL_X25         262
#define SOL_PACKET	263
#define SOL_ATM		264	/* ATM layer (cell level).  */
#define SOL_AAL		265	/* ATM Adaption Layer (packet level).  */
#define SOL_IRDA	266

/* 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.  */
  };


/* Structure large enough to hold any socket address (with the historical
   exception of AF_UNIX).  We reserve 128 bytes.  */
#if ULONG_MAX > 0xffffffff
# define __ss_aligntype	__uint64_t
#else
# define __ss_aligntype	__uint32_t
#endif
#define _SS_SIZE	128
#define _SS_PADSIZE	(_SS_SIZE - (2 * sizeof (__ss_aligntype)))

struct sockaddr_storage
  {
    __SOCKADDR_COMMON (__ss_);	/* Address family, etc.  */
    __ss_aligntype __ss_align;	/* Force desired alignment.  */
    char __ss_padding[_SS_PADSIZE];
  };


/* Bits in the FLAGS argument to `send', `recv', et al.  */
enum
  {
    MSG_OOB		= 0x01,	/* Process out-of-band data.  */
#define MSG_OOB		MSG_OOB
    MSG_PEEK		= 0x02,	/* Peek at incoming messages.  */
#define MSG_PEEK	MSG_PEEK
    MSG_DONTROUTE	= 0x04,	/* Don't use local routing.  */
#define MSG_DONTROUTE	MSG_DONTROUTE
#ifdef __USE_GNU
    /* DECnet uses a different name.  */
    MSG_TRYHARD		= MSG_DONTROUTE,
# define MSG_TRYHARD	MSG_DONTROUTE
#endif
    MSG_CTRUNC		= 0x08,	/* Control data lost before delivery.  */
#define MSG_CTRUNC	MSG_CTRUNC
    MSG_PROXY		= 0x10,	/* Supply or ask second address.  */
#define MSG_PROXY	MSG_PROXY
    MSG_TRUNC		= 0x20,
#define	MSG_TRUNC	MSG_TRUNC
    MSG_DONTWAIT	= 0x40, /* Nonblocking IO.  */
#define	MSG_DONTWAIT	MSG_DONTWAIT
    MSG_EOR		= 0x80, /* End of record.  */
#define	MSG_EOR		MSG_EOR
    MSG_WAITALL		= 0x100, /* Wait for a full request.  */
#define	MSG_WAITALL	MSG_WAITALL
    MSG_FIN		= 0x200,
#define	MSG_FIN		MSG_FIN
    MSG_SYN		= 0x400,
#define	MSG_SYN		MSG_SYN
    MSG_URG		= 0x800,
#define	MSG_URG		MSG_URG
    MSG_RST		= 0x1000,
#define	MSG_RST		MSG_RST
    MSG_ERRQUEUE	= 0x2000, /* Fetch message from error queue.  */
#define	MSG_ERRQUEUE	MSG_ERRQUEUE
    MSG_NOSIGNAL	= 0x4000  /* Do not generate SIGPIPE.  */
#define	MSG_NOSIGNAL	MSG_NOSIGNAL
  };


/* Structure describing messages sent by
   `sendmsg' and received by `recvmsg'.  */
struct msghdr
  {
    __ptr_t msg_name;		/* Address to send to/receive from.  */
    socklen_t msg_namelen;	/* Length of address data.  */

    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.  */
    /* XXX Perhaps this should be removed.  */
#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))

extern struct cmsghdr *__cmsg_nxthdr __P ((struct msghdr *__mhdr,
					   struct cmsghdr *__cmsg));
#ifdef __USE_EXTERN_INLINES
# ifndef _EXTERN_INLINE
#  define _EXTERN_INLINE extern __inline
# endif
_EXTERN_INLINE struct cmsghdr *
__cmsg_nxthdr (struct msghdr *__mhdr, struct cmsghdr *__cmsg) __THROW
{
  if ((size_t) __cmsg->cmsg_len < sizeof (struct cmsghdr))
    /* The kernel header does this so there may be a reason.  */
    return 0;

  __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 0;
  return __cmsg;
}
#endif	/* Use `extern inline'.  */

/* Socket level message types.  This must match the definitions in
   <linux/socket.h>.  */
enum
  {
    SCM_RIGHTS = 0x01,		/* Transfer file descriptors.  */
#define SCM_RIGHTS SCM_RIGHTS
#ifdef __USE_BSD
    SCM_CREDENTIALS = 0x02,     /* Credentials passing.  */
# define SCM_CREDENTIALS SCM_CREDENTIALS
#endif
    __SCM_CONNECT = 0x03	/* Data array is `struct scm_connect'.  */
  };

/* User visible structure for SCM_CREDENTIALS message */

struct ucred
{
  pid_t pid;			/* PID of sending process.  */
  uid_t uid;			/* UID of sending process.  */
  gid_t gid;			/* GID of sending process.  */
};

/* 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.  */
  };

#endif	/* bits/socket.h */
Commit	Line	Data
cc78dedd	1	/* System-specific socket constants and types. Linux version.
	2	Copyright (C) 1991,92,94,95,96,97,98,99 Free Software Foundation, Inc.
	3	This file is part of the GNU C Library.
	4
	5	The GNU C Library is free software; you can redistribute it and/or
	6	modify it under the terms of the GNU Library General Public License as
	7	published by the Free Software Foundation; either version 2 of the
	8	License, or (at your option) any later version.
	9
	10	The GNU C Library is distributed in the hope that it will be useful,
	11	but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	Library General Public License for more details.
	14
	15	You should have received a copy of the GNU Library General Public
	16	License along with the GNU C Library; see the file COPYING.LIB. If not,
	17	write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
	18	Boston, MA 02111-1307, USA. */
	19
	20	#ifndef __BITS_SOCKET_H
	21	#define __BITS_SOCKET_H
	22
	23	#if !defined _SYS_SOCKET_H && !defined _NETINET_IN_H
	24	# error "Never include <bits/socket.h> directly; use <sys/socket.h> instead."
	25	#endif
	26
	27	#define __need_size_t
	28	#define __need_NULL
	29	#include <stddef.h>
	30
	31	#include <limits.h>
	32	#include <sys/types.h>
	33
	34	/* Type for length arguments in socket calls. */
	35	typedef unsigned int socklen_t;
	36
	37	/* Types of sockets. */
	38	enum __socket_type
	39	{
	40	SOCK_STREAM = 1, /* Sequenced, reliable, connection-based
	41	byte streams. */
	42	#define SOCK_STREAM SOCK_STREAM
	43	SOCK_DGRAM = 2, /* Connectionless, unreliable datagrams
	44	of fixed maximum length. */
	45	#define SOCK_DGRAM SOCK_DGRAM
	46	SOCK_RAW = 3, /* Raw protocol interface. */
	47	#define SOCK_RAW SOCK_RAW
	48	SOCK_RDM = 4, /* Reliably-delivered messages. */
	49	#define SOCK_RDM SOCK_RDM
	50	SOCK_SEQPACKET = 5, /* Sequenced, reliable, connection-based,
	51	datagrams of fixed maximum length. */
	52	#define SOCK_SEQPACKET SOCK_SEQPACKET
	53	SOCK_PACKET = 10 /* Linux specific way of getting packets
	54	at the dev level. For writing rarp and
	55	other similar things on the user level. */
	56	#define SOCK_PACKET SOCK_PACKET
	57	};
	58
	59	/* Protocol families. */
	60	#define PF_UNSPEC 0 /* Unspecified. */
	61	#define PF_LOCAL 1 /* Local to host (pipes and file-domain). */
	62	#define PF_UNIX PF_LOCAL /* Old BSD name for PF_LOCAL. */
	63	#define PF_FILE PF_LOCAL /* Another non-standard name for PF_LOCAL. */
	64	#define PF_INET 2 /* IP protocol family. */
65	#define PF_AX25 3 /* Amateur Radio AX.25. */
66	#define PF_IPX 4 /* Novell Internet Protocol. */
67	#define PF_APPLETALK 5 /* Appletalk DDP. */
68	#define PF_NETROM 6 /* Amateur radio NetROM. */
69	#define PF_BRIDGE 7 /* Multiprotocol bridge. */
70	#define PF_ATMPVC 8 /* ATM PVCs. */
71	#define PF_X25 9 /* Reserved for X.25 project. */
72	#define PF_INET6 10 /* IP version 6. */
73	#define PF_ROSE 11 /* Amateur Radio X.25 PLP. */
74	#define PF_DECnet 12 /* Reserved for DECnet project. */
75	#define PF_NETBEUI 13 /* Reserved for 802.2LLC project. */
76	#define PF_SECURITY 14 /* Security callback pseudo AF. */
77	#define PF_KEY 15 /* PF_KEY key management API. */
78	#define PF_NETLINK 16
79	#define PF_ROUTE PF_NETLINK /* Alias to emulate 4.4BSD. */
80	#define PF_PACKET 17 /* Packet family. */
81	#define PF_ASH 18 /* Ash. */
82	#define PF_ECONET 19 /* Acorn Econet. */
83	#define PF_ATMSVC 20 /* ATM SVCs. */
84	#define PF_SNA 22 /* Linux SNA Project */
85	#define PF_IRDA 23 /* IRDA sockets. */
86	#define PF_MAX 32 /* For now.. */
87
88	/* Address families. */
89	#define AF_UNSPEC PF_UNSPEC
90	#define AF_LOCAL PF_LOCAL
91	#define AF_UNIX PF_UNIX
92	#define AF_FILE PF_FILE
93	#define AF_INET PF_INET
94	#define AF_AX25 PF_AX25
95	#define AF_IPX PF_IPX
96	#define AF_APPLETALK PF_APPLETALK
97	#define AF_NETROM PF_NETROM
98	#define AF_BRIDGE PF_BRIDGE
99	#define AF_ATMPVC PF_ATMPVC
100	#define AF_X25 PF_X25
101	#define AF_INET6 PF_INET6
102	#define AF_ROSE PF_ROSE
103	#define AF_DECnet PF_DECnet
104	#define AF_NETBEUI PF_NETBEUI
105	#define AF_SECURITY PF_SECURITY
106	#define AF_KEY PF_KEY
107	#define AF_NETLINK PF_NETLINK
108	#define AF_ROUTE PF_ROUTE
109	#define AF_PACKET PF_PACKET
110	#define AF_ASH PF_ASH
111	#define AF_ECONET PF_ECONET
112	#define AF_ATMSVC PF_ATMSVC
113	#define AF_SNA PF_SNA
114	#define AF_IRDA PF_IRDA
115	#define AF_MAX PF_MAX
116
117	/* Socket level values. Others are defined in the appropriate headers.
118
119	XXX These definitions also should go into the appropriate headers as
120	far as they are available. */
121	#define SOL_RAW 255
122	#define SOL_DECNET 261
123	#define SOL_X25 262
124	#define SOL_PACKET 263
125	#define SOL_ATM 264 /* ATM layer (cell level). */
126	#define SOL_AAL 265 /* ATM Adaption Layer (packet level). */
127	#define SOL_IRDA 266
128
129	/* Maximum queue length specifiable by listen. */
130	#define SOMAXCONN 128
131
132	/* Get the definition of the macro to define the common sockaddr members. */
133
134	#include <bits/sockaddr.h>
135
136	/* Structure describing a generic socket address. */
137	struct sockaddr
138	{
139	__SOCKADDR_COMMON (sa_); /* Common data: address family and length. */
140	char sa_data[14]; /* Address data. */
141	};
142
143
144	/* Structure large enough to hold any socket address (with the historical
145	exception of AF_UNIX). We reserve 128 bytes. */
146	#if ULONG_MAX > 0xffffffff
147	# define __ss_aligntype __uint64_t
148	#else
149	# define __ss_aligntype __uint32_t
150	#endif
151	#define _SS_SIZE 128
152	#define _SS_PADSIZE (_SS_SIZE - (2 * sizeof (__ss_aligntype)))
153
154	struct sockaddr_storage
155	{
156	__SOCKADDR_COMMON (__ss_); /* Address family, etc. */
157	__ss_aligntype __ss_align; /* Force desired alignment. */
158	char __ss_padding[_SS_PADSIZE];
159	};
160
161
162	/* Bits in the FLAGS argument to `send', `recv', et al. */
163	enum
164	{
165	MSG_OOB = 0x01, /* Process out-of-band data. */
166	#define MSG_OOB MSG_OOB
167	MSG_PEEK = 0x02, /* Peek at incoming messages. */
168	#define MSG_PEEK MSG_PEEK
169	MSG_DONTROUTE = 0x04, /* Don't use local routing. */
170	#define MSG_DONTROUTE MSG_DONTROUTE
171	#ifdef __USE_GNU
172	/* DECnet uses a different name. */
173	MSG_TRYHARD = MSG_DONTROUTE,
174	# define MSG_TRYHARD MSG_DONTROUTE
175	#endif
176	MSG_CTRUNC = 0x08, /* Control data lost before delivery. */
177	#define MSG_CTRUNC MSG_CTRUNC
178	MSG_PROXY = 0x10, /* Supply or ask second address. */
179	#define MSG_PROXY MSG_PROXY
180	MSG_TRUNC = 0x20,
181	#define MSG_TRUNC MSG_TRUNC
182	MSG_DONTWAIT = 0x40, /* Nonblocking IO. */
183	#define MSG_DONTWAIT MSG_DONTWAIT
184	MSG_EOR = 0x80, /* End of record. */
185	#define MSG_EOR MSG_EOR
186	MSG_WAITALL = 0x100, /* Wait for a full request. */
187	#define MSG_WAITALL MSG_WAITALL
188	MSG_FIN = 0x200,
189	#define MSG_FIN MSG_FIN
190	MSG_SYN = 0x400,
191	#define MSG_SYN MSG_SYN
192	MSG_URG = 0x800,
193	#define MSG_URG MSG_URG
194	MSG_RST = 0x1000,
195	#define MSG_RST MSG_RST
196	MSG_ERRQUEUE = 0x2000, /* Fetch message from error queue. */
197	#define MSG_ERRQUEUE MSG_ERRQUEUE
198	MSG_NOSIGNAL = 0x4000 /* Do not generate SIGPIPE. */
199	#define MSG_NOSIGNAL MSG_NOSIGNAL
200	};
201
202
203	/* Structure describing messages sent by
204	`sendmsg' and received by `recvmsg'. */
205	struct msghdr
206	{
207	__ptr_t msg_name; /* Address to send to/receive from. */
208	socklen_t msg_namelen; /* Length of address data. */
209
210	struct iovec msg_iov; / Vector of data to send/receive into. */
211	size_t msg_iovlen; /* Number of elements in the vector. */
212
213	__ptr_t msg_control; /* Ancillary data (eg BSD filedesc passing). */
214	size_t msg_controllen; /* Ancillary data buffer length. */
215
216	int msg_flags; /* Flags on received message. */
217	};
218
219	/* Structure used for storage of ancillary data object information. */
220	struct cmsghdr
221	{
222	size_t cmsg_len; /* Length of data in cmsg_data plus length
223	of cmsghdr structure. */
224	int cmsg_level; /* Originating protocol. */
225	int cmsg_type; /* Protocol specific type. */
226	#if !defined __STRICT_ANSI__ && defined __GNUC__ && __GNUC__ >= 2
227	unsigned char __cmsg_data[0]; /* Ancillary data. */
228	/* XXX Perhaps this should be removed. */
229	#endif
230	};
231
232	/* Ancillary data object manipulation macros. */
233	#if !defined __STRICT_ANSI__ && defined __GNUC__ && __GNUC__ >= 2
234	# define CMSG_DATA(cmsg) ((cmsg)->__cmsg_data)
235	#else
236	# define CMSG_DATA(cmsg) ((unsigned char ) ((struct cmsghdr ) (cmsg) + 1))
237	#endif
238	#define CMSG_NXTHDR(mhdr, cmsg) __cmsg_nxthdr (mhdr, cmsg)
239	#define CMSG_FIRSTHDR(mhdr) \
240	((size_t) (mhdr)->msg_controllen >= sizeof (struct cmsghdr) \
241	? (struct cmsghdr ) (mhdr)->msg_control : (struct cmsghdr ) NULL)
242	#define CMSG_ALIGN(len) (((len) + sizeof (size_t) - 1) \
243	& ~(sizeof (size_t) - 1))
244	#define CMSG_SPACE(len) (CMSG_ALIGN (len) \
245	+ CMSG_ALIGN (sizeof (struct cmsghdr)))
246	#define CMSG_LEN(len) (CMSG_ALIGN (sizeof (struct cmsghdr)) + (len))
247
248	extern struct cmsghdr __cmsg_nxthdr __P ((struct msghdr __mhdr,
249	struct cmsghdr *__cmsg));
250	#ifdef __USE_EXTERN_INLINES
251	# ifndef _EXTERN_INLINE
252	# define _EXTERN_INLINE extern __inline
253	# endif
254	_EXTERN_INLINE struct cmsghdr *
255	__cmsg_nxthdr (struct msghdr __mhdr, struct cmsghdr __cmsg) __THROW
256	{
257	if ((size_t) __cmsg->cmsg_len < sizeof (struct cmsghdr))
258	/* The kernel header does this so there may be a reason. */
259	return 0;
260
261	__cmsg = (struct cmsghdr ) ((unsigned char ) __cmsg
262	+ CMSG_ALIGN (__cmsg->cmsg_len));
263	if ((unsigned char ) (__cmsg + 1) >= ((unsigned char ) __mhdr->msg_control
264	+ __mhdr->msg_controllen)
265	\|\| ((unsigned char *) __cmsg + CMSG_ALIGN (__cmsg->cmsg_len)
266	>= ((unsigned char *) __mhdr->msg_control + __mhdr->msg_controllen)))
267	/* No more entries. */
268	return 0;
269	return __cmsg;
270	}
271	#endif /* Use `extern inline'. */
272
273	/* Socket level message types. This must match the definitions in
274	<linux/socket.h>. */
275	enum
276	{
277	SCM_RIGHTS = 0x01, /* Transfer file descriptors. */
278	#define SCM_RIGHTS SCM_RIGHTS
279	#ifdef __USE_BSD
280	SCM_CREDENTIALS = 0x02, /* Credentials passing. */
281	# define SCM_CREDENTIALS SCM_CREDENTIALS
282	#endif
283	__SCM_CONNECT = 0x03 /* Data array is `struct scm_connect'. */
284	};
285
286	/* User visible structure for SCM_CREDENTIALS message */
287
288	struct ucred
289	{
290	pid_t pid; /* PID of sending process. */
291	uid_t uid; /* UID of sending process. */
292	gid_t gid; /* GID of sending process. */
293	};
294
295	/* Get socket manipulation related informations from kernel headers. */
296	#include <asm/socket.h>
297
298
299	/* Structure used to manipulate the SO_LINGER option. */
300	struct linger
301	{
302	int l_onoff; /* Nonzero to linger on close. */
303	int l_linger; /* Time to linger. */
304	};
305
306	#endif /* bits/socket.h */
307
308
309