我正在将一个为Unix编写的相对简单的控制台程序移植到Windows平台(Visual C++ 8.0).所有源文件都包含"unistd.h"，但它并不存在.删除它后，我会收到关于将原型误写为"srandom"、"random"和"getopt"的投诉.
但我相信其他人也遇到了同样的挑战. 我的问题是:Windows有没有"unistd.h"的端口？至少有一个包含那些具有本机Windows实现的函数-我不需要管道或派生.
EDIT:
我知道我可以创建自己的"unistd.h"，其中包含我需要的东西的替代品——尤其是在这种情况下，因为它是一个有限的集合.但是，由于这似乎是一个常见的问题，我想知道是否有人已经为更大的功能子集完成了这项工作.
在工作中切换到不同的编译器或环境是不可能的——我被Visual Studio困住了.
既然我们在互联网上找不到一个版本，我们就从这里开始吧
#ifndef _UNISTD_H
#define _UNISTD_H 1
/* This is intended as a drop-in replacement for unistd.h on Windows.
* Please add functionality as neeeded.
* https://stackoverflow.com/a/826027/1202830
*/
#include <stdlib.h>
#include <io.h>
#include <getopt.h> /* getopt at: https://gist.github.com/ashelly/7776712 */
#include <process.h> /* for getpid() and the exec..() family */
#include <direct.h> /* for _getcwd() and _chdir() */
#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(). */
#ifdef _WIN64
#define ssize_t __int64
#else
#define ssize_t long
#endif
#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 /* unistd.h */