// POSIX emulation for Win32
//
// Copyright (c) 2003 Jan Wassenberg
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of the
// License, or (at your option) any later version.
//
// This program 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
// General Public License for more details.
//
// Contact info:
//   Jan.Wassenberg@stud.uni-karlsruhe.de
//   http://www.stud.uni-karlsruhe.de/~urkt/

#include <stddef.h>

#ifndef _WIN32

#include <sys/types.h>
#include <limits.h>
#include <unistd.h>
#include <sys/time.h>
#include <fcntl.h>
#include <pthread.h>
#include <sys/mman.h>
#include <aio.h>
#include <errno.h>
#include <dirent.h>
#include <sys/utsname.h>
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <sys/ioctl.h>

#define __POSIX_H__		// => rest of header ignored

#endif


#ifndef __POSIX_H__
#define __POSIX_H__


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

#ifdef __cplusplus
extern "C" {
#endif


#define IMP(ret, name, param) extern "C" __declspec(dllimport) ret __stdcall name param;



//
// <inttypes.h>
//

typedef unsigned short u16_t;


//
// <sys/types.h>
//

typedef long ssize_t;


//
// <limits.h>
//

#define PATH_MAX 260


//
// <errno.h>
//

#define EINPROGRESS 100000

/*
enum
{
EINPROGRESS = 1000,   // Operation in progress. 
ENOMEM        // Not enough space. 
EACCES,        // Permission denied. 
EADDRINUSE,    // Address in use. 
EADDRNOTAVAIL, // Address not available. 
EAGAIN,        // Resource unavailable, try again (may be the same value as EWOULDBLOCK]). 
EALREADY,      // Connection already in progress. 
EBADF,         // Bad file descriptor. 
ECANCELED,     // Operation canceled. 
ECONNABORTED,  // Connection aborted. 
ECONNREFUSED,  // Connection refused. 
ECONNRESET,    // Connection reset. 
EDOM,          // Mathematics argument out of domain of IMPtion. 
EEXIST,        // File exists. 
EFAULT,        // Bad address. 
EHOSTUNREACH,  // Host is unreachable. 
EINTR,         // Interrupted IMPtion. 
EINVAL,        // Invalid argument. 
EISCONN,       // Socket is connected. 
EISDIR,        // Is a directory. 
ENAMETOOLONG,  // Filename too long. 
ENETDOWN,      // Network is down. 
ENETRESET,     // Connection aborted by network. 
ENETUNREACH,   // Network unreachable. 
ENOENT,        // No such file or directory. 
ENOEXEC,       // Executable file format error. 

ENOSPC,        // No space left on device. 
ENOSYS,        // IMPtion not supported. 
ENOTCONN,      // The socket is not connected. 
ENOTDIR,       // Not a directory. 
ENOTEMPTY,     // Directory not empty. 
ENOTSOCK,      // Not a socket. 
ENOTSUP,       // Not supported. 
EOVERFLOW,     // Value too large to be stored in data type. 
EPERM,         // Operation not permitted. 
EPIPE,         // Broken pipe. 
EPROTO,        // Protocol error. 
ERANGE,        // Result too large. 
ETIMEDOUT,     // Connection timed out. 
EWOULDBLOCK    // Operation would block (may be the same value as EAGAIN]). 

};
*/

//
// <time.h>
//

typedef long time_t;

typedef enum
{
	CLOCK_REALTIME
}
clockid_t;

struct timespec
{
	time_t tv_sec;
	long   tv_nsec;
};

extern time_t time(time_t*);
extern int clock_gettime(clockid_t clock_id, struct timespec* tp);
extern int nanosleep(const struct timespec* rqtp, struct timespec* rmtp);


//
// sys/stat.h
//

typedef unsigned short ino_t;
typedef unsigned int mode_t;
typedef long off_t;
typedef unsigned int dev_t;

// struct stat defined in VC sys/stat.h

#define stat _stat

extern int mkdir(const char*, mode_t);


//
// dirent.h
//

typedef void DIR;

struct dirent
{
	ino_t d_ino;
	char* d_name;
};

extern DIR* opendir(const char* name);
extern struct dirent* readdir(DIR*);
extern int closedir(DIR*);


//
// <sys/mman.h>
//

#define PROT_READ	0x01	// page can be read
#define PROT_WRITE	0x02	// page can be written

#define MAP_SHARED	0x01	// share changes across processes
#define MAP_PRIVATE	0x02	// private copy on write mapping
#define MAP_FIXED	0x04

#define MAP_FAILED 0

extern void* mmap(void* start, unsigned int len, int prot, int flags, int fd, long offset);
extern int munmap(void* start, unsigned int len);


//
// <fcntl.h>
//

// values from MS _open - do not change!
#define O_RDONLY       0x0000  // open for reading only
#define O_WRONLY       0x0001  // open for writing only
#define O_RDWR         0x0002  // open for reading and writing
#define O_APPEND       0x0008  // writes done at eof
#define O_CREAT        0x0100  // create and open file
#define O_TRUNC        0x0200  // open and truncate
#define O_EXCL         0x0400  // open only if file doesn't already exist
#define O_BINARY       0x8000  // file mode is binary (untranslated)

#define O_NONBLOCK     0x1000000

extern int open(const char* fn, int mode, ...);


//
// <unistd.h>
//

#define F_OK 0
#define R_OK 1
#define W_OK 2
#define X_OK 4

#define read _read
#define write _write

extern int close(int);
extern int access(const char*, int);
extern int chdir(const char*);

extern unsigned int sleep(unsigned int sec);

#ifndef _WINSOCKAPI_


IMP(int, gethostname, (char* name, size_t namelen))

#endif

//
// <stdlib.h>
//

extern char* realpath(const char*, char*);


//
// <signal.h>
//

union sigval
{
    int sival_int;				// Integer signal value.
    void* sival_ptr;			// Pointer signal value.
};

struct sigevent
{
    int sigev_notify;			// notification mode
    int sigev_signo;			// signal number
    union sigval sigev_value;	// signal value
	void (*sigev_notify_function)(union sigval);
//	pthread_attr_t *sigev_notify_attributes;
};


//
// <termios.h>
//

#define TCSANOW 0

struct termios
{
	long c_lflag;
};

#define ICANON 2	// do not change - correspond to ENABLE_LINE_INPUT / ENABLE_ECHO_INPUT
#define ECHO   4

extern int tcgetattr(int fd, struct termios* termios_p);
extern int tcsetattr(int fd, int optional_actions, const struct termios* termios_p);


//
// <sched.h>
//

struct sched_param
{
	int sched_priority;
};

enum
{
	SCHED_RR,
	SCHED_FIFO,
	SCHED_OTHER
};

#define sched_get_priority_max(policy) 15		// TIME_CRITICAL
#define sched_get_priority_min(policy) -15		// IDLE


//
// <pthread.h>
//

typedef unsigned int pthread_t;

extern pthread_t pthread_self();
extern int pthread_setschedparam(pthread_t thread, int policy, const struct sched_param* param);
extern int pthread_create(pthread_t* thread, const void* attr, void*(*IMP)(void*), void* arg);

typedef void* pthread_mutex_t;
typedef void pthread_mutexattr_t;

extern pthread_mutex_t pthread_mutex_initializer();
#define PTHREAD_MUTEX_INITIALIZER pthread_mutex_initializer()

extern int pthread_mutex_init(pthread_mutex_t*, const pthread_mutexattr_t*);
extern int pthread_mutex_destroy(pthread_mutex_t*);

extern int pthread_mutex_lock(pthread_mutex_t*);
extern int pthread_mutex_trylock(pthread_mutex_t*);
extern int pthread_mutex_unlock(pthread_mutex_t*);



//
// <sys/socket.h>
//

typedef unsigned long socklen_t;
typedef unsigned short sa_family_t;

// Win32 values - do not change

#ifndef _WINSOCKAPI_

#define SOCK_STREAM 1
#define SOCK_DGRAM 2
#define AF_INET 2
#define PF_INET AF_INET
#define AF_INET6        23
#define PF_INET6 AF_INET6

IMP(int, socket, (int, int, int))
IMP(int, setsockopt, (int, int, int, const void*, socklen_t))
IMP(int, ioctlsocket, (int, int, const void *))
IMP(int, shutdown, (int, int))
IMP(int, closesocket, (int))

#define SOL_SOCKET      0xffff          /* options for socket level */
#define TCP_NODELAY		0x0001

/* This is the slightly unreadable encoded form of the windows ioctl that sets
non-blocking mode for a socket */
#define FIONBIO     0x8004667E

enum {
	SHUT_RD=0,
	SHUT_WR=1,
	SHUT_RDWR=2
};
IMP(int, getsockopt, (int, int, int, void*, socklen_t*))


struct sockaddr;

//
// <netinet/in.h>
//

typedef unsigned long in_addr_t;
typedef unsigned short in_port_t;

struct in_addr
{
	in_addr_t s_addr;
};

struct sockaddr_in
{
	sa_family_t    sin_family;
	in_port_t      sin_port;
	struct in_addr sin_addr;
	unsigned char  sin_zero[8];
};

#define INET_ADDRSTRLEN 16

#define INADDR_ANY 0
#define INADDR_NONE ((in_addr_t)-1)

#define IPPROTO_IP 0
#define IP_ADD_MEMBERSHIP 5
#define IP_DROP_MEMBERSHIP 6

struct ip_mreq
{
	struct in_addr imr_multiaddr;   /* multicast group to join */
	struct in_addr imr_interface;   /* interface to join on    */
};

// IPv6 Structures

struct in6_addr {
	unsigned char 		s6_addr[16];
};

struct sockaddr_in6 {
	sa_family_t			sin6_family;     /* AF_INET6 */
	in_port_t			sin6_port;       /* Transport level port number */
	unsigned long		sin6_flowinfo;   /* IPv6 flow information */
	struct in6_addr		sin6_addr;       /* IPv6 address */
	unsigned long		sin6_scope_id;   /* set of interfaces for a scope */
};

// IPv6 Defines and Constants

extern const struct in6_addr in6addr_any;        /* :: */
extern const struct in6_addr in6addr_loopback;   /* ::1 */
#define IN6ADDR_ANY_INIT {  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 }
#define IN6ADDR_LOOPBACK_INIT { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 }

//
// <netdb.h>
//

struct hostent
{
	char* h_name;       // Official name of the host. 
	char** h_aliases;   // A pointer to an array of pointers to 
	                    // alternative host names, terminated by a
	                    // null pointer. 
	short h_addrtype;   // Address type. 
	short h_length;     // The length, in bytes, of the address. 
	char** h_addr_list; // A pointer to an array of pointers to network 
	                    // addresses (in network byte order) for the host, 
	                    // terminated by a null pointer. 
};

IMP(struct hostent*, gethostbyname, (const char *name))

#define h_error WSAGetLastError()
#define TRY_AGAIN 11002
#define HOST_NOT_FOUND 11001

/* addrinfo struct */
struct addrinfo
{
    int ai_flags;              /* AI_PASSIVE, AI_CANONNAME, AI_NUMERICHOST */
    int ai_family;             /* PF_xxx */
    int ai_socktype;           /* SOCK_xxx */
    int ai_protocol;           /* 0 or IPPROTO_xxx for IPv4 and IPv6 */
    size_t ai_addrlen;         /* Length of ai_addr */
    char *ai_canonname;        /* Canonical name for nodename */
    struct sockaddr *ai_addr;  /* Binary address */
    struct addrinfo *ai_next;  /* Next structure in linked list */
};

/* Hint flags for getaddrinfo */
#define AI_PASSIVE     0x1  /* Socket address will be used in bind() call */

/* Flags for getnameinfo() */
#define NI_NUMERICHOST  0x02  /* Return numeric form of the host's address */

/* Various Constants */
#define NI_MAXHOST 1025
#define NI_MAXSERV 32

/* Note that these are function pointers. They will be initialized by the
   entry point function in posix.cpp */
typedef int (*fp_getnameinfo_t)(const struct sockaddr *sa, socklen_t salen, char *node,
	socklen_t nodelen, char *serv, socklen_t servlen, unsigned int flags);
typedef int (*fp_getaddrinfo_t)(const char	*nodename, const char *servname,
	const struct addrinfo *hints, struct addrinfo **res);
typedef void (*fp_freeaddrinfo_t)(struct addrinfo *ai);

extern fp_getnameinfo_t p_getnameinfo;
extern fp_getaddrinfo_t p_getaddrinfo;
extern fp_freeaddrinfo_t p_freeaddrinfo;

#define getnameinfo p_getnameinfo
#define getaddrinfo p_getaddrinfo
#define freeaddrinfo p_freeaddrinfo

// getaddr/nameinfo error codes
#define EAI_NONAME HOST_NOT_FOUND

//
// <arpa/inet.h>
//

extern u16_t htons(u16_t hostshort);
IMP(unsigned long, htonl, (unsigned long hostlong))
#define ntohs htons

IMP(in_addr_t, inet_addr, (const char*))
IMP(char*, inet_ntoa, (in_addr))
IMP(int, accept, (int, struct sockaddr*, socklen_t*))
IMP(int, bind, (int, const struct sockaddr*, socklen_t))
IMP(int, connect, (int, const struct sockaddr*, socklen_t))
IMP(int, listen, (int, int))
IMP(ssize_t, recv, (int, void*, size_t, int))
IMP(ssize_t, send, (int, const void*, size_t, int))
IMP(ssize_t, sendto, (int, const void*, size_t, int, const struct sockaddr*, socklen_t))
IMP(ssize_t, recvfrom, (int, void*, size_t, int, struct sockaddr*, socklen_t*))

#endif /* _WINSOCKAPI_ */

//
// <poll.h>
//

struct pollfd
{
	int fd;
	short int events, revents;
};

#define POLLIN 1

extern int poll(struct pollfd[], int, int);


//
// <sys/utsname.h>
//

struct utsname
{
	char sysname[9];   // Name of this implementation of the operating system. 
	char nodename[16]; // Name of this node within an implementation-defined 
					   // communications network. 
	                   // Win9x requires this minimum buffer size.
	char release[9];   // Current release level of this implementation. 
	char version[16];  // Current version level of this release. 
	char machine[9];   // Name of the hardware type on which the system is running. 
};

extern int uname(struct utsname*);


//
// serial port IOCTL
//

// use with TIOCMBIS
#define TIOCM_RTS 1

// use with TIOCMGET or TIOCMIWAIT
#define TIOCM_CD  0x80	// MS_RLSD_ON
#define TIOCM_CTS 0x10	// MS_CTS_ON

enum
{
	TIOCMBIS,		// set control line
	TIOCMGET,		// get line state
	TIOCMIWAIT		// wait for status change
};

extern int ioctl(int fd, int op, int* data);

#define FIONREAD 0

extern void _get_console();
extern void _hide_console();


#include "posix/aio.h"

extern void entry(void);
extern void mainCRTStartup();


#ifdef __cplusplus
}
#endif


#endif	// #ifndef __POSIX_H__