musl/arch/x86_64/bits/socket.h

struct msghdr
{
	void *msg_name;
	socklen_t msg_namelen;
	struct iovec *msg_iov;
	int msg_iovlen, __pad1;
	void *msg_control;
	socklen_t msg_controllen, __pad2;
	int msg_flags;
};

struct cmsghdr
{
	socklen_t cmsg_len;
	int cmsg_level;
	int cmsg_type;
};

struct ucred
{
	pid_t pid;
	uid_t uid;
	gid_t gid;
};

struct linger
{
	int l_onoff;
	int l_linger;
};

#define SHUT_RD 0
#define SHUT_WD 1
#define SHUT_RDWR 2

#define SOCK_STREAM    1
#define SOCK_DGRAM     2
#define SOCK_RAW       3
#define SOCK_RDM       4
#define SOCK_SEQPACKET 5
#define SOCK_DCCP      6
#define SOCK_PACKET    10

/* linux extensions */
#define SOCK_CLOEXEC   02000000
#define SOCK_NONBLOCK  04000

#define PF_UNSPEC       0
#define PF_LOCAL        1
#define PF_UNIX         PF_LOCAL
#define PF_FILE         PF_LOCAL
#define PF_INET         2
#define PF_AX25         3
#define PF_IPX          4
#define PF_APPLETALK    5
#define PF_NETROM       6
#define PF_BRIDGE       7
#define PF_ATMPVC       8
#define PF_X25          9
#define PF_INET6        10
#define PF_ROSE         11
#define PF_DECnet       12
#define PF_NETBEUI      13
#define PF_SECURITY     14
#define PF_KEY          15
#define PF_NETLINK      16
#define PF_ROUTE        PF_NETLINK
#define PF_PACKET       17
#define PF_ASH          18
#define PF_ECONET       19
#define PF_ATMSVC       20
#define PF_SNA          22
#define PF_IRDA         23
#define PF_PPPOX        24
#define PF_WANPIPE      25
#define PF_BLUETOOTH    31
#define PF_IUCV         32
#define PF_RXRPC        33
#define PF_ISDN         34
#define PF_PHONET       35
#define PF_IEEE802154   36
#define PF_CAIF         37
#define PF_ALG          38
#define PF_MAX          39

#define AF_UNSPEC       PF_UNSPEC
#define AF_LOCAL        PF_LOCAL
#define AF_UNIX         AF_LOCAL
#define AF_FILE         AF_LOCAL
#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        AF_NETLINK
#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_PPPOX        PF_PPPOX
#define AF_WANPIPE      PF_WANPIPE
#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_MAX          PF_MAX

#define SO_DEBUG        1
#define SO_REUSEADDR    2
#define SO_TYPE         3
#define SO_ERROR        4
#define SO_DONTROUTE    5
#define SO_BROADCAST    6
#define SO_SNDBUF       7
#define SO_RCVBUF       8
#define SO_KEEPALIVE    9
#define SO_OOBINLINE    10
#define SO_NO_CHECK     11
#define SO_PRIORITY     12
#define SO_LINGER       13
#define SO_BSDCOMPAT    14
#define SO_REUSEPORT    15
#define SO_PASSCRED     16
#define SO_PEERCRED     17
#define SO_RCVLOWAT     18
#define SO_SNDLOWAT     19
#define SO_RCVTIMEO     20
#define SO_SNDTIMEO     21

#define SO_SECURITY_AUTHENTICATION              22
#define SO_SECURITY_ENCRYPTION_TRANSPORT        23
#define SO_SECURITY_ENCRYPTION_NETWORK          24

#define SO_BINDTODEVICE 25

#define SO_ATTACH_FILTER        26
#define SO_DETACH_FILTER        27

#define SO_PEERNAME             28
#define SO_TIMESTAMP            29
#define SCM_TIMESTAMP           SO_TIMESTAMP

#define SO_ACCEPTCONN           30

#define SOL_SOCKET      1

/* ??? */
#define SOL_RAW         255
#define SOL_DECNET      261
#define SOL_X25         262
#define SOL_PACKET      263
#define SOL_ATM         264
#define SOL_AAL         265
#define SOL_IRDA        266

#define SOMAXCONN       128

#define MSG_OOB       0x0001
#define MSG_PEEK      0x0002
#define MSG_DONTROUTE 0x0004
#define MSG_CTRUNC    0x0008
#define MSG_PROXY     0x0010
#define MSG_TRUNC     0x0020
#define MSG_DONTWAIT  0x0040
#define MSG_EOR       0x0080
#define MSG_WAITALL   0x0100
#define MSG_FIN       0x0200
#define MSD_SYN       0x0400
#define MSG_CONFIRM   0x0800
#define MSG_RST       0x1000
#define MSG_ERRQUEUE  0x2000
#define MSG_NOSIGNAL  0x4000
#define MSG_MORE      0x8000
#define MSG_WAITFORONE 0x10000
#define MSG_CMSG_CLOEXEC 0x40000000

/* Internal use only!! to make CMSG_NXTHDR definition readable by mortals */
#define __CMSG_LEN(cmsg) (((cmsg)->cmsg_len + sizeof(long) - 1) & ~(long)(sizeof(long) - 1))
#define __CMSG_NEXT(cmsg) ((unsigned char *)(cmsg) + __CMSG_LEN(cmsg))
#define __MHDR_END(mhdr) ((unsigned char *)(mhdr)->msg_control + (mhdr)->msg_controllen)

#define CMSG_DATA(cmsg) ((unsigned char *) (((struct cmsghdr *)(cmsg)) + 1))
#define CMSG_NXTHDR(mhdr, cmsg) ((cmsg)->cmsg_len < sizeof (struct cmsghdr) ? (struct cmsghdr *)0 : \
        (__CMSG_NEXT(cmsg) + sizeof (struct cmsghdr) >= __MHDR_END(mhdr) ? (struct cmsghdr *)0 : \
        ((struct cmsghdr *)__CMSG_NEXT(cmsg))))
#define CMSG_FIRSTHDR(mhdr) ((size_t) (mhdr)->msg_controllen >= sizeof (struct cmsghdr) ? (struct cmsghdr *) (mhdr)->msg_control : (struct cmsghdr *) 0)

/* Are these valid? */
#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))

#define SCM_RIGHTS      0x01
#define SCM_CREDENTIALS 0x02