/*      $OpenBSD: socket.h,v 1.108 2025/08/04 04:59:30 guenther Exp $   */
/*      $NetBSD: socket.h,v 1.14 1996/02/09 18:25:36 christos Exp $     */

/*
 * Copyright (c) 1982, 1985, 1986, 1988, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)socket.h    8.4 (Berkeley) 2/21/94
 */

#ifndef _SYS_SOCKET_H_
#define _SYS_SOCKET_H_

/* get the definitions for struct iovec, size_t, ssize_t, and <sys/cdefs.h> */
#include <sys/uio.h>

#if __BSD_VISIBLE
#include <sys/types.h>                  /* for off_t, uid_t, and gid_t */
#endif

#ifndef _SOCKLEN_T_DEFINED_
#define _SOCKLEN_T_DEFINED_
typedef __socklen_t     socklen_t;      /* length type for network syscalls */
#endif

#ifndef _SA_FAMILY_T_DEFINED_
#define _SA_FAMILY_T_DEFINED_
typedef __sa_family_t   sa_family_t;    /* sockaddr address family type */
#endif


/*
 * Definitions related to sockets: types, address families, options.
 */

/*
 * Types
 */
#define SOCK_STREAM     1               /* stream socket */
#define SOCK_DGRAM      2               /* datagram socket */
#define SOCK_RAW        3               /* raw-protocol interface */
#define SOCK_RDM        4               /* reliably-delivered message */
#define SOCK_SEQPACKET  5               /* sequenced packet stream */
#ifdef _KERNEL
#define SOCK_TYPE_MASK  0x000F          /* mask that covers the above */
#endif

/*
 * Socket creation flags
 */
#if __POSIX_VISIBLE >= 202405 || __BSD_VISIBLE
#define SOCK_CLOEXEC            0x8000  /* set FD_CLOEXEC */
#define SOCK_NONBLOCK           0x4000  /* set O_NONBLOCK */
#endif
#if __BSD_VISIBLE
#ifdef _KERNEL
#define SOCK_NONBLOCK_INHERIT   0x2000  /* inherit O_NONBLOCK from listener */
#endif
#define SOCK_DNS                0x1000  /* set SS_DNS */
#endif /* __BSD_VISIBLE */
#if __POSIX_VISIBLE >= 202405
#define SOCK_CLOFORK            0x0800  /* set FD_CLOFORK */
#endif

/*
 * Option flags per-socket.
 */
#define SO_DEBUG        0x0001          /* turn on debugging info recording */
#define SO_ACCEPTCONN   0x0002          /* socket has had listen() */
#define SO_REUSEADDR    0x0004          /* allow local address reuse */
#define SO_KEEPALIVE    0x0008          /* keep connections alive */
#define SO_DONTROUTE    0x0010          /* just use interface addresses */
#define SO_BROADCAST    0x0020          /* permit sending of broadcast msgs */
#define SO_USELOOPBACK  0x0040          /* bypass hardware when possible */
#define SO_LINGER       0x0080          /* linger on close if data present */
#define SO_OOBINLINE    0x0100          /* leave received OOB data in line */
#define SO_REUSEPORT    0x0200          /* allow local address & port reuse */
#define SO_TIMESTAMP    0x0800          /* timestamp received dgram traffic */
#define SO_BINDANY      0x1000          /* allow bind to any address */
#define SO_ZEROIZE      0x2000          /* zero out all mbufs sent over socket */

/*
 * Additional options, not kept in so_options.
 */
#define SO_SNDBUF       0x1001          /* send buffer size */
#define SO_RCVBUF       0x1002          /* receive buffer size */
#define SO_SNDLOWAT     0x1003          /* send low-water mark */
#define SO_RCVLOWAT     0x1004          /* receive low-water mark */
#define SO_SNDTIMEO     0x1005          /* send timeout */
#define SO_RCVTIMEO     0x1006          /* receive timeout */
#define SO_ERROR        0x1007          /* get error status and clear */
#define SO_TYPE         0x1008          /* get socket type */
#define SO_RTABLE       0x1021          /* routing table to be used */
#define SO_PEERCRED     0x1022          /* get connect-time credentials */
#define SO_SPLICE       0x1023          /* splice data to other socket */
#define SO_DOMAIN       0x1024          /* get socket domain */
#define SO_PROTOCOL     0x1025          /* get socket protocol */

/*
 * Structure used for manipulating linger option.
 */
struct  linger {
        int     l_onoff;                /* option on/off */
        int     l_linger;               /* linger time */
};

#if __BSD_VISIBLE

#ifndef _TIMEVAL_DECLARED
#define _TIMEVAL_DECLARED
struct timeval {
        time_t          tv_sec;         /* seconds */
        suseconds_t     tv_usec;        /* and microseconds */
};
#endif

/*
 * Structure used for manipulating splice option.
 */
struct  splice {
        int     sp_fd;                  /* drain socket file descriptor */
        off_t   sp_max;                 /* if set, maximum bytes to splice */
        struct  timeval sp_idle;        /* idle timeout */
};

/*
 * Maximum number of alternate routing tables
 */
#define RT_TABLEID_MAX          255
#define RT_TABLEID_BITS         8
#define RT_TABLEID_MASK         0xff

#endif /* __BSD_VISIBLE */

/*
 * Level number for (get/set)sockopt() to apply to socket itself.
 */
#define SOL_SOCKET      0xffff          /* options for socket level */

/*
 * Address families.
 */
#define AF_UNSPEC       0               /* unspecified */
#define AF_UNIX         1               /* local to host */
#define AF_LOCAL        AF_UNIX         /* draft POSIX compatibility */
#define AF_INET         2               /* internetwork: UDP, TCP, etc. */
#define AF_IMPLINK      3               /* arpanet imp addresses */
#define AF_PUP          4               /* pup protocols: e.g. BSP */
#define AF_CHAOS        5               /* mit CHAOS protocols */
#define AF_NS           6               /* XEROX NS protocols */
#define AF_ISO          7               /* ISO protocols */
#define AF_OSI          AF_ISO
#define AF_ECMA         8               /* european computer manufacturers */
#define AF_DATAKIT      9               /* datakit protocols */
#define AF_CCITT        10              /* CCITT protocols, X.25 etc */
#define AF_SNA          11              /* IBM SNA */
#define AF_DECnet       12              /* DECnet */
#define AF_DLI          13              /* DEC Direct data link interface */
#define AF_LAT          14              /* LAT */
#define AF_HYLINK       15              /* NSC Hyperchannel */
#define AF_APPLETALK    16              /* Apple Talk */
#define AF_ROUTE        17              /* Internal Routing Protocol */
#define AF_LINK         18              /* Link layer interface */
#define pseudo_AF_XTP   19              /* eXpress Transfer Protocol (no AF) */
#define AF_COIP         20              /* connection-oriented IP, aka ST II */
#define AF_CNT          21              /* Computer Network Technology */
#define pseudo_AF_RTIP  22              /* Help Identify RTIP packets */
#define AF_IPX          23              /* Novell Internet Protocol */
#define AF_INET6        24              /* IPv6 */
#define pseudo_AF_PIP   25              /* Help Identify PIP packets */
#define AF_ISDN         26              /* Integrated Services Digital Network*/
#define AF_E164         AF_ISDN         /* CCITT E.164 recommendation */
#define AF_NATM         27              /* native ATM access */
#define AF_ENCAP        28
#define AF_SIP          29              /* Simple Internet Protocol */
#define AF_KEY          30
#define pseudo_AF_HDRCMPLT 31           /* Used by BPF to not rewrite headers
                                           in interface output routine */
#define AF_BLUETOOTH    32              /* Bluetooth */
#define AF_MPLS         33              /* MPLS */
#define pseudo_AF_PFLOW 34              /* pflow */
#define pseudo_AF_PIPEX 35              /* PIPEX */
#define AF_FRAME        36              /* frame (Ethernet) sockets */
#define AF_MAX          37

/*
 * Structure used by kernel to store most
 * addresses.
 */
struct sockaddr {
        __uint8_t    sa_len;            /* total length */
        sa_family_t sa_family;          /* address family */
        char        sa_data[14];        /* actually longer; address value */
};

/*
 * Sockaddr type which can hold any sockaddr type available
 * in the system.
 *
 * Note: __ss_{len,family} is defined in RFC2553.  During RFC2553 discussion
 * the field name went back and forth between ss_len and __ss_len,
 * and RFC2553 specifies it to be __ss_len.  openbsd picked ss_len.
 * For maximum portability, userland programmer would need to
 * (1) make the code never touch ss_len portion (cast it into sockaddr and
 * touch sa_len), or (2) add "-Dss_len=__ss_len" into CFLAGS to unify all
 * occurrences (including header file) to __ss_len.
 */
struct sockaddr_storage {
        __uint8_t       ss_len;         /* total length */
        sa_family_t     ss_family;      /* address family */
        unsigned char   __ss_pad1[6];   /* align to quad */
        __uint64_t      __ss_pad2;      /* force alignment for stupid compilers */
        unsigned char   __ss_pad3[240]; /* pad to a total of 256 bytes */
};

#ifdef _KERNEL
/*
 * Structure used by kernel to pass protocol
 * information in raw sockets.
 */
struct sockproto {
        unsigned short  sp_family;      /* address family */
        unsigned short  sp_protocol;    /* protocol */
};
#endif /* _KERNEL */

/*
 * Protocol families, same as address families for now.
 */
#define PF_UNSPEC       AF_UNSPEC
#define PF_LOCAL        AF_LOCAL
#define PF_UNIX         AF_UNIX
#define PF_INET         AF_INET
#define PF_IMPLINK      AF_IMPLINK
#define PF_PUP          AF_PUP
#define PF_CHAOS        AF_CHAOS
#define PF_NS           AF_NS
#define PF_ISO          AF_ISO
#define PF_OSI          AF_ISO
#define PF_ECMA         AF_ECMA
#define PF_DATAKIT      AF_DATAKIT
#define PF_CCITT        AF_CCITT
#define PF_SNA          AF_SNA
#define PF_DECnet       AF_DECnet
#define PF_DLI          AF_DLI
#define PF_LAT          AF_LAT
#define PF_HYLINK       AF_HYLINK
#define PF_APPLETALK    AF_APPLETALK
#define PF_ROUTE        AF_ROUTE
#define PF_LINK         AF_LINK
#define PF_XTP          pseudo_AF_XTP   /* really just proto family, no AF */
#define PF_COIP         AF_COIP
#define PF_CNT          AF_CNT
#define PF_IPX          AF_IPX          /* same format as AF_NS */
#define PF_INET6        AF_INET6
#define PF_RTIP         pseudo_AF_RTIP  /* same format as AF_INET */
#define PF_PIP          pseudo_AF_PIP
#define PF_ISDN         AF_ISDN
#define PF_NATM         AF_NATM
#define PF_ENCAP        AF_ENCAP
#define PF_SIP          AF_SIP
#define PF_KEY          AF_KEY
#define PF_BPF          pseudo_AF_HDRCMPLT
#define PF_BLUETOOTH    AF_BLUETOOTH
#define PF_MPLS         AF_MPLS
#define PF_PFLOW        pseudo_AF_PFLOW
#define PF_PIPEX        pseudo_AF_PIPEX
#define PF_FRAME        AF_FRAME
#define PF_MAX          AF_MAX

/*
 * These are the valid values for the "how" field used by shutdown(2).
 */
#define SHUT_RD         0
#define SHUT_WR         1
#define SHUT_RDWR       2

#if __BSD_VISIBLE
#define SA_LEN(x) ((x)->sa_len)

/* Read using getsockopt() with SOL_SOCKET, SO_PEERCRED */
struct sockpeercred {
        uid_t           uid;            /* effective user id */
        gid_t           gid;            /* effective group id */
        pid_t           pid;
};

/*
 * Definitions for network related sysctl, CTL_NET.
 *
 * Second level is protocol family.
 * Third level is protocol number.
 *
 * Further levels are defined by the individual families below.
 */
#define NET_MAXID       AF_MAX

#define CTL_NET_NAMES { \
        { 0, 0 }, \
        { "unix", CTLTYPE_NODE }, \
        { "inet", CTLTYPE_NODE }, \
        { "implink", CTLTYPE_NODE }, \
        { "pup", CTLTYPE_NODE }, \
        { "chaos", CTLTYPE_NODE }, \
        { "xerox_ns", CTLTYPE_NODE }, \
        { "iso", CTLTYPE_NODE }, \
        { "ecma", CTLTYPE_NODE }, \
        { "datakit", CTLTYPE_NODE }, \
        { "ccitt", CTLTYPE_NODE }, \
        { "ibm_sna", CTLTYPE_NODE }, \
        { "decnet", CTLTYPE_NODE }, \
        { "dec_dli", CTLTYPE_NODE }, \
        { "lat", CTLTYPE_NODE }, \
        { "hylink", CTLTYPE_NODE }, \
        { "appletalk", CTLTYPE_NODE }, \
        { "route", CTLTYPE_NODE }, \
        { "link", CTLTYPE_NODE }, \
        { "xtp", CTLTYPE_NODE }, \
        { "coip", CTLTYPE_NODE }, \
        { "cnt", CTLTYPE_NODE }, \
        { "rtip", CTLTYPE_NODE }, \
        { "ipx", CTLTYPE_NODE }, \
        { "inet6", CTLTYPE_NODE }, \
        { "pip", CTLTYPE_NODE }, \
        { "isdn", CTLTYPE_NODE }, \
        { "natm", CTLTYPE_NODE }, \
        { "encap", CTLTYPE_NODE }, \
        { "sip", CTLTYPE_NODE }, \
        { "key", CTLTYPE_NODE }, \
        { "bpf", CTLTYPE_NODE }, \
        { "bluetooth", CTLTYPE_NODE }, \
        { "mpls", CTLTYPE_NODE }, \
        { "pflow", CTLTYPE_NODE }, \
        { "pipex", CTLTYPE_NODE }, \
}

/*
 * PF_ROUTE - Routing table
 *
 * Four additional levels are defined:
 *      Fourth: address family, 0 is wildcard
 *      Fifth: type of info, defined below
 *      Sixth: flag(s) to mask with for NET_RT_FLAGS
 *      Seventh: routing table to use (facultative, defaults to 0)
 *               NET_RT_TABLE has the table id as sixth element.
 */
#define NET_RT_DUMP     1               /* dump; may limit to a.f. */
#define NET_RT_FLAGS    2               /* by flags, e.g. RESOLVING */
#define NET_RT_IFLIST   3               /* survey interface list */
#define NET_RT_STATS    4               /* routing table statistics */
#define NET_RT_TABLE    5
#define NET_RT_IFNAMES  6
#define NET_RT_SOURCE   7
#define NET_RT_MAXID    8

#define CTL_NET_RT_NAMES { \
        { 0, 0 }, \
        { "dump", CTLTYPE_STRUCT }, \
        { "flags", CTLTYPE_STRUCT }, \
        { "iflist", CTLTYPE_STRUCT }, \
        { "stats", CTLTYPE_STRUCT }, \
        { "table", CTLTYPE_STRUCT }, \
        { "ifnames", CTLTYPE_STRUCT }, \
        { "source", CTLTYPE_STRUCT }, \
}

/*
 * PF_UNIX - unix socket tunables
 */
#define NET_UNIX_INFLIGHT       6
#define NET_UNIX_DEFERRED       7
#define NET_UNIX_MAXID          8

#define CTL_NET_UNIX_NAMES { \
        { 0, 0 }, \
        { "stream", CTLTYPE_NODE }, \
        { "dgram", CTLTYPE_NODE }, \
        { 0, 0 }, \
        { 0, 0 }, \
        { "seqpacket", CTLTYPE_NODE }, \
        { "inflight", CTLTYPE_INT }, \
        { "deferred", CTLTYPE_INT }, \
}

#define UNPCTL_RECVSPACE        1
#define UNPCTL_SENDSPACE        2
#define NET_UNIX_PROTO_MAXID    3

#define CTL_NET_UNIX_PROTO_NAMES { \
        { 0, 0 }, \
        { "recvspace", CTLTYPE_INT }, \
        { "sendspace", CTLTYPE_INT }, \
}

/*
 * PF_LINK - link layer or device tunables
 */
#define NET_LINK_IFRXQ          1       /* net.link.ifrxq */
#define NET_LINK_MAXID          2

#define CTL_NET_LINK_NAMES { \
        { 0, 0 }, \
        { "ifrxq", CTLTYPE_NODE }, \
}

#define NET_LINK_IFRXQ_PRESSURE_RETURN \
                                1       /* net.link.ifrxq.pressure_return */
#define NET_LINK_IFRXQ_PRESSURE_DROP \
                                2       /* net.link.ifrxq.pressure_drop */
#define NET_LINK_IFRXQ_MAXID    3

#define CTL_NET_LINK_IFRXQ_NAMES { \
        { 0, 0 }, \
        { "pressure_return", CTLTYPE_INT }, \
        { "pressure_drop", CTLTYPE_INT }, \
}

/*
 * PF_KEY - Key Management
 */
#define NET_KEY_SADB_DUMP       1       /* return SADB */
#define NET_KEY_SPD_DUMP        2       /* return SPD */
#define NET_KEY_MAXID           3

#define CTL_NET_KEY_NAMES { \
        { 0, 0 }, \
        { "sadb_dump", CTLTYPE_STRUCT }, \
        { "spd_dump", CTLTYPE_STRUCT }, \
}

/*
 * PF_BPF  not really a family, but connected under CTL_NET
 */
#define NET_BPF_BUFSIZE         1               /* default buffer size */
#define NET_BPF_MAXBUFSIZE      2               /* maximum buffer size */
#define NET_BPF_MAXID           3

#define CTL_NET_BPF_NAMES { \
        { 0, 0 }, \
        { "bufsize", CTLTYPE_INT }, \
        { "maxbufsize", CTLTYPE_INT }, \
}

/*
 * PF_PFLOW not really a family, but connected under CTL_NET
 */
#define NET_PFLOW_STATS         1               /* statistics */
#define NET_PFLOW_MAXID         2

#define CTL_NET_PFLOW_NAMES { \
        { 0, 0 }, \
        { "stats", CTLTYPE_STRUCT }, \
}
#endif /* __BSD_VISIBLE */

/*
 * Maximum queue length specifiable by listen(2).
 */
#define SOMAXCONN       128

/*
 * Message header for recvmsg and sendmsg calls.
 * Used value-result for recvmsg, value only for sendmsg.
 */
struct msghdr {
        void            *msg_name;      /* optional address */
        socklen_t       msg_namelen;    /* size of address */
        struct          iovec *msg_iov; /* scatter/gather array */
        unsigned int    msg_iovlen;     /* # elements in msg_iov */
        void            *msg_control;   /* ancillary data, see below */
        socklen_t       msg_controllen; /* ancillary data buffer len */
        int             msg_flags;      /* flags on received message */
};

struct mmsghdr {
        struct msghdr msg_hdr;
        unsigned int msg_len;
};

struct timespec;

#define MSG_OOB                 0x1     /* process out-of-band data */
#define MSG_PEEK                0x2     /* peek at incoming message */
#define MSG_DONTROUTE           0x4     /* send without using routing tables */
#define MSG_EOR                 0x8     /* data completes record */
#define MSG_TRUNC               0x10    /* data discarded before delivery */
#define MSG_CTRUNC              0x20    /* control data lost before delivery */
#define MSG_WAITALL             0x40    /* wait for full request or error */
#define MSG_DONTWAIT            0x80    /* this message should be nonblocking */
#define MSG_BCAST               0x100   /* this message rec'd as broadcast */
#define MSG_MCAST               0x200   /* this message rec'd as multicast */
#define MSG_NOSIGNAL            0x400   /* do not send SIGPIPE */
#define MSG_CMSG_CLOEXEC        0x800   /* set FD_CLOEXEC on received fds */
#define MSG_WAITFORONE          0x1000  /* nonblocking but wait for one msg */
#define MSG_CMSG_CLOFORK        0x2000  /* set FD_CLOFORK on received fds */

/*
 * Header for ancillary data objects in msg_control buffer.
 * Used for additional information with/about a datagram
 * not expressible by flags.  The format is a sequence
 * of message elements headed by cmsghdr structures.
 */
struct cmsghdr {
        socklen_t       cmsg_len;       /* data byte count, including hdr */
        int             cmsg_level;     /* originating protocol */
        int             cmsg_type;      /* protocol-specific type */
/* followed by  u_char  cmsg_data[]; */
};

/* given pointer to struct cmsghdr, return pointer to data */
#define CMSG_DATA(cmsg) \
        ((unsigned char *)(cmsg) + _ALIGN(sizeof(struct cmsghdr)))

/* given pointer to struct cmsghdr, return pointer to next cmsghdr */
#define CMSG_NXTHDR(mhdr, cmsg) \
        (((char *)(cmsg) + _ALIGN((cmsg)->cmsg_len) + \
                            _ALIGN(sizeof(struct cmsghdr)) > \
            ((char *)(mhdr)->msg_control) + (mhdr)->msg_controllen) ? \
            (struct cmsghdr *)NULL : \
            (struct cmsghdr *)((char *)(cmsg) + _ALIGN((cmsg)->cmsg_len)))

/*
 * RFC 2292 requires to check msg_controllen, in case that the kernel returns
 * an empty list for some reasons.
 */
#define CMSG_FIRSTHDR(mhdr) \
        ((mhdr)->msg_controllen >= sizeof(struct cmsghdr) ? \
         (struct cmsghdr *)(mhdr)->msg_control : \
         (struct cmsghdr *)NULL)

/* Round len up to next alignment boundary */
#ifdef _KERNEL
#define CMSG_ALIGN(n)           _ALIGN(n)
#endif

/* Length of the contents of a control message of length len */
#define CMSG_LEN(len)   (_ALIGN(sizeof(struct cmsghdr)) + (len))

/* Length of the space taken up by a padded control message of length len */
#define CMSG_SPACE(len) (_ALIGN(sizeof(struct cmsghdr)) + _ALIGN(len))

/* "Socket"-level control message types: */
#define SCM_RIGHTS      0x01            /* access rights (array of int) */
#define SCM_TIMESTAMP   0x04            /* timestamp (struct timeval) */

#ifndef _KERNEL

__BEGIN_DECLS
int     accept(int, struct sockaddr *, socklen_t *);
int     bind(int, const struct sockaddr *, socklen_t);
int     connect(int, const struct sockaddr *, socklen_t);
int     getpeername(int, struct sockaddr *, socklen_t *);
int     getsockname(int, struct sockaddr *, socklen_t *);
int     getsockopt(int, int, int, void *, socklen_t *);
int     listen(int, int);
ssize_t recv(int, void *, size_t, int);
ssize_t recvfrom(int, void *, size_t, int, struct sockaddr *, socklen_t *);
ssize_t recvmsg(int, struct msghdr *, int);
int     recvmmsg(int, struct mmsghdr *, unsigned int, int, struct timespec *);
ssize_t send(int, const void *, size_t, int);
ssize_t sendto(int, const void *,
            size_t, int, const struct sockaddr *, socklen_t);
ssize_t sendmsg(int, const struct msghdr *, int);
int     sendmmsg(int, struct mmsghdr *, unsigned int, int);
int     setsockopt(int, int, int, const void *, socklen_t);
int     shutdown(int, int);
int     sockatmark(int);
int     socket(int, int, int);
int     socketpair(int, int, int, int *);

#if __POSIX_VISIBLE >= 202405 || __BSD_VISIBLE
int     accept4(int, struct sockaddr *__restrict, socklen_t *__restrict, int);
#endif

#if __BSD_VISIBLE
int     getpeereid(int, uid_t *, gid_t *);
int     getrtable(void);
int     setrtable(int);
#endif /* __BSD_VISIBLE */

__END_DECLS

#else

static inline struct sockaddr *
sstosa(struct sockaddr_storage *ss)
{
        return ((struct sockaddr *)(ss));
}

#endif /* !_KERNEL */

#endif /* !_SYS_SOCKET_H_ */