BuildSystem: Move all userpace libraries under the userspace directory

As the number of libraries is increasing, root directory starts to
expand. This adds better organization for libraries

userspace/libraries/LibC/include/sys/socket.h

@@ -0,0 +1,160 @@
+#ifndef _SYS_SOCKET_H
+#define _SYS_SOCKET_H 1
+
+// https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_socket.h.html
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+#define __need_size_t
+#define __need_ssize_t
+#include <sys/types.h>
+
+#include <sys/uio.h>
+
+#include <bits/types/sa_family_t.h>
+typedef long socklen_t;
+
+#if !defined(FILENAME_MAX)
+	#define FILENAME_MAX 256
+#elif FILENAME_MAX != 256
+	#error "invalid FILENAME_MAX"
+#endif
+
+struct sockaddr
+{
+	sa_family_t	sa_family;	/* Address family. */
+	char		sa_data[];	/* Socket address (variable-length data). */
+};
+
+struct sockaddr_storage
+{
+	sa_family_t ss_family;
+	char		ss_storage[FILENAME_MAX];
+};
+
+struct msghdr
+{
+	void*			msg_name;		/* Optional address. */
+	socklen_t		msg_namelen;	/* Size of address. */
+	struct iovec*	msg_iov;		/* Scatter/gather array. */
+	int				msg_iovlen;		/* Members 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 cmsghdr
+{
+	socklen_t	cmsg_len;	/* Data byte count, including the cmsghdr. */
+	int			cmsg_level;	/* Originating protocol. */
+	int			cmsg_type;	/* Protocol-specific type. */
+};
+
+// FIXME
+#if 0
+#define SCM_RIGHTS
+
+#define CMSG_DATA(cmsg)
+#define CMSG_NXTHDR(mhdr, cmsg)
+#define CMSG_FIRSTHDR(mhdr)
+#endif
+
+struct linger
+{
+	int l_onoff;	/* Indicates wheter linger option is enabled. */
+	int l_linger;	/* Linger time, in seconds. */
+};
+
+#define SOCK_DGRAM		0
+#define SOCK_RAW		1
+#define SOCK_SEQPACKET	2
+#define SOCK_STREAM		3
+
+#define SOL_SOCKET 1
+
+#define SO_ACCEPTCONN	0
+#define SO_BROADCAST	1
+#define SO_DEBUG		2
+#define SO_DONTROUTE	3
+#define SO_ERROR		4
+#define SO_KEEPALIVE	5
+#define SO_LINGER		6
+#define SO_OOBINLINE	7
+#define SO_RCVBUF		8
+#define SO_RCVLOWAT		9
+#define SO_RCVTIMEO		10
+#define SO_REUSEADDR	11
+#define SO_SNDBUF		12
+#define SO_SNDLOWAT		13
+#define SO_SNDTIMEO		14
+#define SO_TYPE			15
+
+#define SOMAXCONN 4096
+
+#define MSG_CTRUNC		0x01
+#define MSG_DONTROUTE	0x02
+#define MSG_EOR			0x04
+#define MSG_OOB			0x08
+#define MSG_NOSIGNAL	0x10
+#define MSG_PEEK		0x20
+#define MSG_TRUNC		0x40
+#define MSG_WAITALL		0x80
+
+#define AF_UNSPEC	0
+#define AF_INET		1
+#define AF_INET6	2
+#define AF_UNIX		3
+
+#define PF_UNSPEC	AF_UNSPEC
+#define PF_INET		AF_INET
+#define PF_INET6	AF_INET6
+#define PF_UNIX		AF_UNIX
+
+#define SHUT_RD		0x01
+#define SHUT_WR		0x02
+#define SHUT_RDWR	(SHUT_RD | SHUT_WR)
+
+struct sys_sendto_t
+{
+	int socket;
+	const void* message;
+	size_t length;
+	int flags;
+	const struct sockaddr* dest_addr;
+	socklen_t dest_len;
+};
+
+struct sys_recvfrom_t
+{
+	int socket;
+	void* buffer;
+	size_t length;
+	int flags;
+	struct sockaddr* address;
+	socklen_t* address_len;
+};
+
+int		accept(int socket, struct sockaddr* __restrict address, socklen_t* __restrict address_len);
+int		bind(int socket, const struct sockaddr* address, socklen_t address_len);
+int		connect(int socket, const struct sockaddr* address, socklen_t address_len);
+int		getpeername(int socket, struct sockaddr* __restrict address, socklen_t* __restrict address_len);
+int		getsockname(int socket, struct sockaddr* __restrict address, socklen_t* __restrict address_len);
+int		getsockopt(int socket, int level, int option_name, void* __restrict option_value, socklen_t* __restrict option_len);
+int		listen(int socket, int backlog);
+ssize_t	recv(int socket, void* buffer, size_t length, int flags);
+ssize_t	recvfrom(int socket, void* __restrict buffer, size_t length, int flags, struct sockaddr* __restrict address, socklen_t* __restrict address_len);
+ssize_t	recvmsg(int socket, struct msghdr* message, int flags);
+ssize_t	send(int socket, const void* buffer, size_t length, int flags);
+ssize_t	sendmsg(int socket, const struct msghdr* message, int flags);
+ssize_t	sendto(int socket, const void* message, size_t length, int flags, const struct sockaddr* dest_addr, socklen_t dest_len);
+int		setsockopt(int socket, int level, int option_name, const void* option_value, socklen_t option_len);
+int		shutdown(int socket, int how);
+int		sockatmark(int s);
+int		socket(int domain, int type, int protocol);
+int		socketpair(int domain, int type, int protocol, int socket_vector[2]);
+
+__END_DECLS
+
+#endif