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?? Editing: socket.h

/* System-specific socket constants and types.  Linux version.
   Copyright (C) 1991-2018 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/>.  */

#ifndef __BITS_SOCKET_H
#define __BITS_SOCKET_H

#ifndef _SYS_SOCKET_H
# error "Never include <bits/socket.h> directly; use <sys/socket.h> instead."
#endif

#define __need_size_t
#include <stddef.h>

#include <sys/types.h>

/* Type for length arguments in socket calls.  */
#ifndef __socklen_t_defined
typedef __socklen_t socklen_t;
# define __socklen_t_defined
#endif

/* Get the architecture-dependent definition of enum __socket_type.  */
#include <bits/socket_type.h>

/* Protocol families.  */
#define PF_UNSPEC	0	/* Unspecified.  */
#define PF_LOCAL	1	/* Local to host (pipes and file-domain).  */
#define PF_UNIX		PF_LOCAL /* POSIX 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_RDS		21	/* RDS sockets.  */
#define PF_SNA		22	/* Linux SNA Project */
#define PF_IRDA		23	/* IRDA sockets.  */
#define PF_PPPOX	24	/* PPPoX sockets.  */
#define PF_WANPIPE	25	/* Wanpipe API sockets.  */
#define PF_LLC		26	/* Linux LLC.  */
#define PF_IB		27	/* Native InfiniBand address.  */
#define PF_MPLS		28	/* MPLS.  */
#define PF_CAN		29	/* Controller Area Network.  */
#define PF_TIPC		30	/* TIPC sockets.  */
#define PF_BLUETOOTH	31	/* Bluetooth sockets.  */
#define PF_IUCV		32	/* IUCV sockets.  */
#define PF_RXRPC	33	/* RxRPC sockets.  */
#define PF_ISDN		34	/* mISDN sockets.  */
#define PF_PHONET	35	/* Phonet sockets.  */
#define PF_IEEE802154	36	/* IEEE 802.15.4 sockets.  */
#define PF_CAIF		37	/* CAIF sockets.  */
#define PF_ALG		38	/* Algorithm sockets.  */
#define PF_NFC		39	/* NFC sockets.  */
#define PF_VSOCK	40	/* vSockets.  */
#define PF_KCM		41	/* Kernel Connection Multiplexor.  */
#define PF_QIPCRTR	42	/* Qualcomm IPC Router.  */
#define PF_SMC		43	/* SMC sockets.  */
#define PF_XDP		44	/* XDP sockets.  */
#define PF_MAX		45	/* 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_RDS		PF_RDS
#define AF_SNA		PF_SNA
#define AF_IRDA		PF_IRDA
#define AF_PPPOX	PF_PPPOX
#define AF_WANPIPE	PF_WANPIPE
#define AF_LLC		PF_LLC
#define AF_IB		PF_IB
#define AF_MPLS		PF_MPLS
#define AF_CAN		PF_CAN
#define AF_TIPC		PF_TIPC
#define AF_BLUETOOTH	PF_BLUETOOTH
#define AF_IUCV		PF_IUCV
#define AF_RXRPC	PF_RXRPC
#define AF_ISDN		PF_ISDN
#define AF_PHONET	PF_PHONET
#define AF_IEEE802154	PF_IEEE802154
#define AF_CAIF		PF_CAIF
#define AF_ALG		PF_ALG
#define AF_NFC		PF_NFC
#define AF_VSOCK	PF_VSOCK
#define AF_KCM		PF_KCM
#define AF_QIPCRTR	PF_QIPCRTR
#define AF_SMC		PF_SMC
#define AF_XDP		PF_XDP
#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
#define SOL_NETBEUI	267
#define SOL_LLC		268
#define SOL_DCCP	269
#define SOL_NETLINK	270
#define SOL_TIPC	271
#define SOL_RXRPC	272
#define SOL_PPPOL2TP	273
#define SOL_BLUETOOTH	274
#define SOL_PNPIPE	275
#define SOL_RDS		276
#define SOL_IUCV	277
#define SOL_CAIF	278
#define SOL_ALG		279
#define SOL_NFC		280
#define SOL_KCM		281
#define SOL_TLS		282
#define SOL_XDP		283

/* 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).  */
#define __ss_aligntype	unsigned long int
#define _SS_PADSIZE \
  (_SS_SIZE - __SOCKADDR_COMMON_SIZE - sizeof (__ss_aligntype))

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

/* 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_CONFIRM		= 0x800, /* Confirm path validity.  */
#define MSG_CONFIRM	MSG_CONFIRM
    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
    MSG_MORE		= 0x8000,  /* Sender will send more.  */
#define MSG_MORE	MSG_MORE
    MSG_WAITFORONE	= 0x10000, /* Wait for at least one packet to return.*/
#define MSG_WAITFORONE	MSG_WAITFORONE
    MSG_BATCH		= 0x40000, /* sendmmsg: more messages coming.  */
#define MSG_BATCH	MSG_BATCH
    MSG_ZEROCOPY	= 0x4000000, /* Use user data in kernel path.  */
#define MSG_ZEROCOPY	MSG_ZEROCOPY
    MSG_FASTOPEN	= 0x20000000, /* Send data in TCP SYN.  */
#define MSG_FASTOPEN	MSG_FASTOPEN

MSG_CMSG_CLOEXEC	= 0x40000000	/* Set close_on_exit for file
					   descriptor received through
					   SCM_RIGHTS.  */
#define MSG_CMSG_CLOEXEC MSG_CMSG_CLOEXEC
  };

/* Structure describing messages sent by
   `sendmsg' and received by `recvmsg'.  */
struct msghdr
  {
    void *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.  */

void *msg_control;		/* Ancillary data (eg BSD filedesc passing). */
    size_t msg_controllen;	/* Ancillary data buffer length.
				   !! The type should be socklen_t but the
				   definition of the kernel is incompatible
				   with this.  */

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.
				   !! The type should be socklen_t but the
				   definition of the kernel is incompatible
				   with this.  */
    int cmsg_level;		/* Originating protocol.  */
    int cmsg_type;		/* Protocol specific type.  */
#if __glibc_c99_flexarr_available
    __extension__ unsigned char __cmsg_data __flexarr; /* Ancillary data.  */
#endif
  };

/* Ancillary data object manipulation macros.  */
#if __glibc_c99_flexarr_available
# 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 *) 0)
#define CMSG_ALIGN(len) (((len) + sizeof (size_t) - 1) \
			 & (size_t) ~(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))

/* Given a length, return the additional padding necessary such that
   len + __CMSG_PADDING(len) == CMSG_ALIGN (len).  */
#define __CMSG_PADDING(len) ((sizeof (size_t) \
                              - ((len) & (sizeof (size_t) - 1))) \
                             & (sizeof (size_t) - 1))

extern struct cmsghdr *__cmsg_nxthdr (struct msghdr *__mhdr,
				      struct cmsghdr *__cmsg) __THROW;
#ifdef __USE_EXTERN_INLINES
# ifndef _EXTERN_INLINE
#  define _EXTERN_INLINE __extern_inline
# endif
_EXTERN_INLINE struct cmsghdr *
__NTH (__cmsg_nxthdr (struct msghdr *__mhdr, struct cmsghdr *__cmsg))
{
  /* We may safely assume that __cmsg lies between __mhdr->msg_control and
     __mhdr->msg_controllen because the user is required to obtain the first
     cmsg via CMSG_FIRSTHDR, set its length, then obtain subsequent cmsgs
     via CMSG_NXTHDR, setting lengths along the way.  However, we don't yet
     trust the value of __cmsg->cmsg_len and therefore do not use it in any
     pointer arithmetic until we check its value.  */

unsigned char * __msg_control_ptr = (unsigned char *) __mhdr->msg_control;
  unsigned char * __cmsg_ptr = (unsigned char *) __cmsg;

size_t __size_needed = sizeof (struct cmsghdr)
                         + __CMSG_PADDING (__cmsg->cmsg_len);

/* The current header is malformed, too small to be a full header.  */
  if ((size_t) __cmsg->cmsg_len < sizeof (struct cmsghdr))
    return (struct cmsghdr *) 0;

/* There isn't enough space between __cmsg and the end of the buffer to
  hold the current cmsg *and* the next one.  */
  if (((size_t)
         (__msg_control_ptr + __mhdr->msg_controllen - __cmsg_ptr)
       < __size_needed)
      || ((size_t)
            (__msg_control_ptr + __mhdr->msg_controllen - __cmsg_ptr
             - __size_needed)
          < __cmsg->cmsg_len))

return (struct cmsghdr *) 0;

/* Now, we trust cmsg_len and can use it to find the next header.  */
  __cmsg = (struct cmsghdr *) ((unsigned char *) __cmsg
			       + CMSG_ALIGN (__cmsg->cmsg_len));
  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_GNU
    , SCM_CREDENTIALS = 0x02	/* Credentials passing.  */
# define SCM_CREDENTIALS SCM_CREDENTIALS
#endif
  };

#ifdef __USE_GNU
/* 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.  */
};
#endif

/* Ugly workaround for unclean kernel headers.  */
#ifndef __USE_MISC
# ifndef FIOGETOWN
#  define __SYS_SOCKET_H_undef_FIOGETOWN
# endif
# ifndef FIOSETOWN
#  define __SYS_SOCKET_H_undef_FIOSETOWN
# endif
# ifndef SIOCATMARK
#  define __SYS_SOCKET_H_undef_SIOCATMARK
# endif
# ifndef SIOCGPGRP
#  define __SYS_SOCKET_H_undef_SIOCGPGRP
# endif
# ifndef SIOCGSTAMP
#  define __SYS_SOCKET_H_undef_SIOCGSTAMP
# endif
# ifndef SIOCGSTAMPNS
#  define __SYS_SOCKET_H_undef_SIOCGSTAMPNS
# endif
# ifndef SIOCSPGRP
#  define __SYS_SOCKET_H_undef_SIOCSPGRP
# endif
#endif
#ifndef IOCSIZE_MASK
# define __SYS_SOCKET_H_undef_IOCSIZE_MASK
#endif
#ifndef IOCSIZE_SHIFT
# define __SYS_SOCKET_H_undef_IOCSIZE_SHIFT
#endif
#ifndef IOC_IN
# define __SYS_SOCKET_H_undef_IOC_IN
#endif
#ifndef IOC_INOUT
# define __SYS_SOCKET_H_undef_IOC_INOUT
#endif
#ifndef IOC_OUT
# define __SYS_SOCKET_H_undef_IOC_OUT
#endif

/* Get socket manipulation related informations from kernel headers.  */
#include <asm/socket.h>

#ifndef __USE_MISC
# ifdef __SYS_SOCKET_H_undef_FIOGETOWN
#  undef __SYS_SOCKET_H_undef_FIOGETOWN
#  undef FIOGETOWN
# endif
# ifdef __SYS_SOCKET_H_undef_FIOSETOWN
#  undef __SYS_SOCKET_H_undef_FIOSETOWN
#  undef FIOSETOWN
# endif
# ifdef __SYS_SOCKET_H_undef_SIOCATMARK
#  undef __SYS_SOCKET_H_undef_SIOCATMARK
#  undef SIOCATMARK
# endif
# ifdef __SYS_SOCKET_H_undef_SIOCGPGRP
#  undef __SYS_SOCKET_H_undef_SIOCGPGRP
#  undef SIOCGPGRP
# endif
# ifdef __SYS_SOCKET_H_undef_SIOCGSTAMP
#  undef __SYS_SOCKET_H_undef_SIOCGSTAMP
#  undef SIOCGSTAMP
# endif
# ifdef __SYS_SOCKET_H_undef_SIOCGSTAMPNS
#  undef __SYS_SOCKET_H_undef_SIOCGSTAMPNS
#  undef SIOCGSTAMPNS
# endif
# ifdef __SYS_SOCKET_H_undef_SIOCSPGRP
#  undef __SYS_SOCKET_H_undef_SIOCSPGRP
#  undef SIOCSPGRP
# endif
#endif
#ifdef __SYS_SOCKET_H_undef_IOCSIZE_MASK
# undef __SYS_SOCKET_H_undef_IOCSIZE_MASK
# undef IOCSIZE_MASK
#endif
#ifdef __SYS_SOCKET_H_undef_IOCSIZE_SHIFT
# undef __SYS_SOCKET_H_undef_IOCSIZE_SHIFT
# undef IOCSIZE_SHIFT
#endif
#ifdef __SYS_SOCKET_H_undef_IOC_IN
# undef __SYS_SOCKET_H_undef_IOC_IN
# undef IOC_IN
#endif
#ifdef __SYS_SOCKET_H_undef_IOC_INOUT
# undef __SYS_SOCKET_H_undef_IOC_INOUT
# undef IOC_INOUT
#endif
#ifdef __SYS_SOCKET_H_undef_IOC_OUT
# undef __SYS_SOCKET_H_undef_IOC_OUT
# undef IOC_OUT
#endif

/* 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 */

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