TONT 33243 为什么(有时)UNC路径的开头允许有盘符?


A little-known quirk is that the file system accepts and ignores a drive letter in front of a UNC path. For example, if you have a directory called \\server\share\directory, you can say

有个鲜为人知的奇怪设计是,文件系统接受(并会忽略)UNC 路径的开头包含盘符。例如,如果你有个目录(的共享路径)是\\server\share\directory,你可以输入

dir P:\\server\share\directory

and the directory will be listed to the screen. The leading P: is ignored.

目录内容会成功列出,开头的 P: 被忽略了。

Why is that?


Rewind to 1984 and the upcoming release of MS-DOS 3.1, which added networking support. Up to this point, all fully-qualified file specifications consisted of three components: A drive letter, a path, and a file name. Many programs relied on this breakdown and did things like “helpfully” prepend a drive letter if it looks like you “forgot” one. For example, if you told it to save the results to \\server\share\file.txt it would say, “Oh dear, that’s not good, the user forgot the drive letter! I’ll put the current drive in front to make things better,” resulting in C:\\server\share\file.txt. Other programs would prompt you with “Please enter a drive letter”, and you couldn’t say “No, there’s no drive letter, just take the path and use it.” They insisted on a drive letter, and you darn sure better give them one.

回到 1984 年,MS-DOS 3.1 即将发布,该版本新增了网络支持。到这时为止,所有完全限定的文件规范包含三个组成部分:盘符、路径和文件名。很多应用程序都依赖这种组合方式,并且如果路径看上去是用户『忘了』录入盘符的话,还会在最前面『帮忙』加上一个。例如,如果用户指定将数据保存到 \\server\share\file.txt,程序就会认为:『哎呀,这怎么行,用户忘了写盘符了!让我在最前面加上当前驱动器的盘符,这样就好了』,路径就变成了 C:\\server\share\file.txt。另外也有程序会提示用户『请输入盘符』,而用户无法告诉程序『不不,这个路径里没有盘符,直接用这个路径就行了』。程序是一定要一个盘符的,而用户不给是不行的。

(Compare the Unix programs that “helpfully” rewrite //server/volume/file as /server/volume/file because they “know” that consecutive slashes collapse, unaware of the special exception for two leading slashes.)

(相较之下,UNIX 程序则会『帮忙』将 //server/volume/file 重写为 /server/volume/file,因为他们『知道』连续斜线应当进行合并,但却不知道两道斜线开头是个例外。)

In order to retain compatibility with programs that provided this sort of “unwanted help”, the designers of the networking support in MS-DOS decided to allow the strange syntax C:\\server\share\directory and treat it as if the drive letter simply weren’t there. Some (but not all) of this quirk of path parsing persists today.

为了保持与提供这种『毫无必要的帮助』的程序的兼容性,MS-DOS 网路支持功能的设计者们决定允许 C:\\server\share\directory 这种奇怪语法的存在,并将其视为开头的盘符

TONT 33303 硬塞狗粮

原文标题:Force-feeding the dogfood


Windows 95 contained some new networking features, and since I was one of those crazy people who sampled every flavor of dogfood in the store, I actually tried out all of them. One of the features, a network protocol, I thought was interesting enough that I decided to help them out by forcing everybody else on the team to dogfood it.

Windows 95 包含了一些新的网络功能。鉴于我是会遍尝店里每种口味狗粮的那种人(译注:见上一篇),我是真的都试了一个遍。对于其中一个功能(某个网络协议),我觉得它很有趣,最终使我决定通过让团队里的每个人都尝一尝这份狗粮的味道的方式,来帮助对应团队的人将它做好。

Here’s how I did it.


I had a bunch of debugging documents and other materials that people generally found useful. I put them on my machine, which acted as a file server. Anybody who wanted these files had to install the network protocol in order to get them. And the files were valuable enough that people were willing to take a chance on a new network driver just to get them. Not only did the client side of the driver get a lot of dogfood test coverage, so too did the server side, since my computer would be servicing a lot of simultaneous connections from people reading my documents. I remember finding a variety of interesting bugs this way. (And of course I ran stress over this protocol.)


I later became friends with the lead tester for the protocol, and he told me that my simple act of force-feeding the dogfood to every other member of the Windows 95 team was a key element of making their feature a success.

后来我跟这个协议的领头开发者成了朋友,他告诉我,我这种让 Windows 95 开发团队的每个人都被强塞一遍狗粮(译注:咳咳)的做法是令他们研发的功能成功的关键元素之一。

TONT 33323 遍尝商店里每种口味的狗粮

原文标题:Sampling every flavor of dogfood in the store


During the development of Windows 95, everybody was, of course, self-hosted and upgraded the operating system on a regular basis as new builds came out. I took it upon myself never to install the operating system twice the same way. Each time I ran setup, I would give different answers to the questions. Maybe this time, I’ll leave out Wordpad and bind NetBIOS over TCP/IP to my Xircom parallel-port network adapter. Or maybe I wouldn’t choose any networking drivers at all during setup and try to add them later. Towards the beginning of the project, nearly every run of setup would run into some strange problem, and some developer from whatever component I decided to configure randomly would be in my office at the debugger trying to figure out what happened. (Fortunately, as the project matured, the problems were rarer and rarer.)

在 Windows 95 的研发过程中,伴随着新编译版本的发布,每个人都时常对手里的版本自行托管、自行升级。我的做法则是从来不用同一种方法运行安装程序两次。每次我运行安装程序的时候,我都会对安装程序给出的提问做出不同的回答。可能这次,我会选择不安装写字板,然后把 NetBIOS over TCP/IP 协议配置在 Xircom 并口网卡上,下次则可能在安装时什么网络驱动程序也不装,等装完系统后再进行配置。在整个开发流程最开始的时候,几乎每次运行安装程序都会遇到一些奇怪的问题,然后负责我随机挑选进行配置的某个组件对应的开发者就会来到我的办公室,打开调试器,试着搞清楚到底发生了什么事。(幸而随着整个工程逐渐成熟之后,类似的问题也变得越来越罕见了。)

I was, you might say, sampling every flavor of dogfood in the store.

也可以说,我这是在遍尝商店里每种口味的狗粮。(译注:Eat your own dogfood 字面意思是『吃自家的狗粮』,在软件开发中,则指『自己开发的产品,自己得先用』,即进行内部测试。)

I would also do crazy things for nightly stress runs. My favorite was to run stress over a parallel port direct cable connection. I don’t think it ever occurred to anyone to test DCC quite this way.


TONT 33353 Dr. Watson 原来叫什么名字?


What most people probably don’t know is that Dr. Watson’s name wasn’t originally “Dr. Watson”.

大多数人可能不知道的是,Dr. Watson 的名字原本并不是 Dr. Watson。

The original name of the diagnostic tool was “Sherlock”, whose icon was a lit drop-stem pipe. I remember chatting about the Doctor with its author, the late Don Corbitt, whose office was just a few doors down from mine. In 1991, he had to change the name from “Sherlock” to “Dr. Watson”; I had forgotten why, but Danny Glasser came to my rescue and reminded me that there was already a debugging tool called “Sherlock” that had come out a few years previously. The name had to change, and the Doctor stepped in to fill Sherlock’s shoes. The icon was originally a doctor’s bag, but it changed to the stethoscope-wielding general practitioner a few months later.

这个诊断工具原来的名字是『夏洛克』(Sherlock),图标则是一只点燃了的烟斗。我还记得跟小 Don Corbitt、也就是这个软件的作者聊起过这件事,他的办公室跟我就隔着几道门。1991 年的时候,他不得不把他的工具从 Sherlock 改名为 Dr. Watson。我已经忘记为什么了,不过 Danny Glasser 帮了我一把,让我想起是因为几年前已经有一个调试工具用过 Sherlock 这个名字了。名字非换不可,于是华生博士(Dr. Watson)就顶替了夏洛克(Sherlock)的位置。新工具原本的图标是一个医师手提包,不过过了几个月就换成戴着听诊器的医生的形象了。

You should also check out Matt Pietrek’s reminiscences about Dr. Watson.

我在这里也推荐 Matt Pietrek 对于 Dr. Watson 的回忆文章。

A note about Don Corbitt. He was a tall fellow with a deep booming voice, but he never used it. Instead, he spoke in a gentle, reassuring tone, backing it up with code that was always solid. I consider it an honor to have worked with him. Taking up the mantle of keeping the Doctor up to date with the latest forensic techniques, I updated it (i.e., rewrote it from scratch) for Windows 98. I was not a member of the Windows 98 team but wrote the program as a favor to them at great personal cost. (My then-boss didn’t approve of my little side project and made his displeasure known at my next performance review.)

这里还要提一下 Don Corbitt,他是个声音低沉的高个子,不过他不怎么用这种音调说话,而是用一种礼貌而令人安心的语调与人交谈,在协助我编写代码方面非常靠得住,我认为跟他共事是一种荣誉。为了肩负起让 Dr. Watson 保持更新的责任,我面向 Windows 98 对其作了更新(也就是从头重写一遍)。我并不是 Windows 98 开发团队的一员,不过还是花费了自己很大的功夫做好了这件事来向 Windows 98 团队表示支持。(我那时候的上司对我这么做并不感冒,并且在之后的一次效率评审会上表达了这种不满。)


TONT 33423 GlobalWire 的名字是怎么来的?


John Elliott wondered why the GlobalWire function was called GlobalWire.

John Elliott 想知道为什么 GlobalWire 函数起了这么个名字。

First, some background for those who never had to write 16-bit Windows programs. The GlobalWire function was similar to the 16-bit GlobalLock function, except that it had the bonus feature of relocating the memory to the lowest available linear address. You used this function as a courtesy if you intended to leave the memory locked for a long time. Moving it to the edge of the address space means that it is unlikely to become an obstacle in the middle of the address space which would otherwise prevent future large memory allocations from succeeding.

首先,给从来都不需要撰写 16 位 Windows 应用程序的人一点背景资料。GlobalWire 函数与 16 位函数 GlobalLock 类似,不过还有将内存块移动到可用的最低线性地址的附加作用。调用这个函数意味着你想让某部分内存锁定较长的一段时间。将内存块移动到地址空间的边缘,使得这块内存不会成为不上不下地横亘在地址空间的一部分,以期未来的大块内存分配不会失败。

But why “wire”?


This employs a colloquial sense of the word “wire” as a verb which has lost its currency in the intervening years. To wire means to fasten securely in a very strong sense. It probably derives from the phrase “hard-wired”, which means “permanently attached in circuitry”. Therefore, “wiring” memory into place ensures that it doesn’t move around.

这里是借用了 wire 这个词作为动词的口语说法,而这种用法这些年大概逐渐式微了。『To wire』意味着将某物『紧紧绑住』的一种强烈语气,可能是来自短语『hard-wired』,含义是『在电路中永久固定』。由此,将内存『捆绑』在某处就是期望其不会到处乱跑。