unistd.h

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#ifndef _UNISTD_H
#define _UNISTD_H 1

#ifndef DOXYGEN_SHOULD_SKIP_THIS

/* This file intended to serve as a drop-in replacement for
 *  unistd.h on Windows
 *  Please add functionality as neeeded
 */

#  include <io.h>
#  include <stdlib.h>
//#include <getopt.h> /* getopt at: https://gist.github.com/ashelly/7776712 */
#  include <direct.h>  /* for _getcwd() and _chdir() */
#  include <process.h> /* for getpid() and the exec..() family */

#  define srandom srand
#  define random rand

/* Values for the second argument to access.
   These may be OR'd together.  */
#  define R_OK 4 /* Test for read permission.  */
#  define W_OK 2 /* Test for write permission.  */
//#define   X_OK    1       /* execute permission - unsupported in windows*/
#  define F_OK 0 /* Test for existence.  */

#  define access _access
#  define dup2 _dup2
#  define execve _execve
#  define ftruncate _chsize
#  define unlink _unlink
#  define fileno _fileno
#  define getcwd _getcwd
#  define chdir _chdir
#  define isatty _isatty
#  define lseek _lseek
/* read, write, and close are NOT being #defined here, because while there are
 * file handle specific versions for Windows, they probably don't work for
 * sockets. You need to look at your app and consider whether to call e.g.
 * closesocket(). */

#  define ssize_t int

#  define STDIN_FILENO 0
#  define STDOUT_FILENO 1
#  define STDERR_FILENO 2
/* should be in some equivalent to <sys/types.h> */
// typedef __int8            int8_t;
typedef __int16          int16_t;
typedef __int32          int32_t;
typedef __int64          int64_t;
typedef unsigned __int8  uint8_t;
typedef unsigned __int16 uint16_t;
typedef unsigned __int32 uint32_t;
typedef unsigned __int64 uint64_t;

#endif /* DOXYGEN_SHOULD_SKIP_THIS */

#endif /* unistd.h  */