What's a Windows equivalent for the Unix unistd.h header file?

Is there a replacement for unistd.h for Windows (Visual C)?

While porting a Unix console program to Windows, developers often encounter missing prototypes for 'srandom', 'random', and 'getopt' due to the absence of "unistd.h".

Despite the need for a drop-in replacement, extensive searches on the internet have yielded no results. To address this gap, here's a starting point for an "unistd.h" port for Windows, covering commonly used functions.

#ifndef _UNISTD_H
#define _UNISTD_H 1

#include <stdlib.h>
#include <io.h>
#include <getopt.h>
#include <process.h>
#include <direct.h>

#define srandom srand
#define random rand

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

#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

#define STDIN_FILENO 0
#define STDOUT_FILENO 1
#define STDERR_FILENO 2

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 /* unistd.h */</direct.h></process.h></getopt.h></io.h></stdlib.h>

This code provides prototypes for the missing functions and incorporates Windows-specific file handling functions while preserving the original Unix file handles (STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO).

Further enhancements can be added to the port as needed, making it a comprehensive replacement for "unistd.h" in Windows environments.

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