blocks|key|3506094|text|从Go1开始，inotify已从包中删除。现在来看一下syscall包。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3506095|3506096|包inotify为Linux+inotify+system实现了一个包装器。|blockquote|3506097|3506098|entityMap|0|LINK|mutability|MUTABLE|url|http://golang.org/pkg/os/inotify/|1|http://golang.org/pkg/syscall/#InotifyInit|2^0|7|7|0|R|7|1|0|0|1|7|2|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]|$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|-4|5|6|7|10|8|@]|9|@]|C|$]]|$1|E|3|F|5|G|7|11|8|@]|9|@$A|12|B|13|1|14]]|C|$]]|$1|H|3|-4|5|6|7|15|8|@]|9|@]|C|$]]|$1|I|3|-4|5|6|7|16|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]|Q|$5|L|M|N|C|$O|R]]|S|$5|L|M|N|C|$O|P]]]]

As of Go1 <a href="http://golang.org/pkg/os/inotify/" rel="nofollow">inotify</a> has been removed from the package. Have a look at the <a href="http://golang.org/pkg/syscall/#InotifyInit" rel="nofollow">syscall</a> package now...

<blockquote>
 Package <a href="http://golang.org/pkg/os/inotify/" rel="nofollow">inotify</a> implements a wrapper for the Linux inotify
 system.
</blockquote>

blocks|key|5403575|text|我想补充一下peterSO的回答，如果你真的想读取由其他进程附加到文件中的数据--+tail程序在Unix中所做的那样--可能更好的做法是让tail自己完成监视文件的繁重工作，并使用它输出的内容。这可以通过使用exec包中的StdoutPipe函数运行tail来实现。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|5403576|在我看来，使用tail来完成这类任务更可取，因为tail已经被教会了一堆聪明的技巧，包括检测文件替换(通常发生在监视日志文件被logrotate或类似的东西轮换时)。|5403577|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/users/221700/peterso|1|http://golang.org/pkg/exec/^0|16|4|1Y|4|34|A|3I|4|6|7|0|2X|4|1|0|7|4|O|4|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]|$9|U|A|V|B|C]|$9|W|A|X|B|C]|$9|Y|A|Z|B|C]]|D|@$9|10|A|11|1|12]|$9|13|A|14|1|15]]|E|$]]|$1|F|3|G|5|6|7|16|8|@$9|17|A|18|B|C]|$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|1B|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]|P|$5|K|L|M|E|$N|Q]]]]

I would add to the <a href="https://stackoverflow.com/users/221700/peterso">peterSO</a>'s answer that if you in fact want to read the data appended to a file by some other process(es) &mdash; what <code>tail</code> program does in Unix, &mdash; it's probably better to just make <code>tail</code> itself do the hard job of monitoring the file and consume what it outputs. This can be achieved by running <code>tail</code> using the <code>StdoutPipe</code> function from the <a href="http://golang.org/pkg/exec/" rel="noreferrer">exec</a> package.

Using <code>tail</code> for this kind of task is preferable in my eyes because <code>tail</code> has been taught to use a bunch of clever tricks including detection of file replacements (commonly occuring when one monitors a log file which is being rotated by logrotate or something similar).

blocks|key|3506163|text|看看https://github.com/howeyc/fsnotify吧。它封装了Linux内核的inotify子系统，应该可以在Go1中工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3506164|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/howeyc/fsnotify^0|2|Y|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Have a look at <a href="https://github.com/howeyc/fsnotify" rel="noreferrer">https://github.com/howeyc/fsnotify</a>. It wraps the inotify subsystem of the Linux kernel and should work in Go1.

blocks|key|5118887|text|下面是一个简单的跨平台版本：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5118888|func+watchFile(filePath+string)+error+{
++++initialStat,+err+:=+os.Stat(filePath)
++++if+err+!=+nil+{
++++++++return+err
++++}

++++for+{
++++++++stat,+err+:=+os.Stat(filePath)
++++++++if+err+!=+nil+{
++++++++++++return+err
++++++++}

++++++++if+stat.Size()+!=+initialStat.Size()+%7C%7C+stat.ModTime()+!=+initialStat.ModTime()+{
++++++++++++break
++++++++}

++++++++time.Sleep(1+*+time.Second)
++++}

++++return+nil
}|code-block|syntax|javascript|5118889|用法是这样的：|5118890|doneChan+:=+make(chan+bool)

go+func(doneChan+chan+bool)+{
++++defer+func()+{
++++++++doneChan+<-+true
++++}()

++++err+:=+watchFile("/path/to/file")
++++if+err+!=+nil+{
++++++++fmt.Println(err)
++++}

++++fmt.Println("File+has+been+changed")
}(doneChan)

<-doneChan|5118891|它的效率不如适当的系统调用，但它很简单，而且适用于任何地方，并且可能足以满足某些用途。|5118892|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Here's a simple cross-platform version:

<pre><code>func watchFile(filePath string) error {
 initialStat, err := os.Stat(filePath)
 if err != nil {
 return err
 }

 for {
 stat, err := os.Stat(filePath)
 if err != nil {
 return err
 }

 if stat.Size() != initialStat.Size() || stat.ModTime() != initialStat.ModTime() {
 break
 }

 time.Sleep(1 * time.Second)
 }

 return nil
}
</code></pre>

And usage would be like this:

<pre><code>doneChan := make(chan bool)

go func(doneChan chan bool) {
 defer func() {
 doneChan &lt;- true
 }()

 err := watchFile("/path/to/file")
 if err != nil {
 fmt.Println(err)
 }

 fmt.Println("File has been changed")
}(doneChan)

&lt;-doneChan
</code></pre>

Not as efficient as a proper system call but it's simple and works everywhere, and might be enough for some uses.

blocks|key|981983|text|目前有一个实验性的包here。应该在go1.3中作为os/fsnotify合并到核心中|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|981984|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/fsnotify/fsnotify^0|Q|B|A|4|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]]|D|@$9|Q|A|R|1|S]]|E|$]]|$1|F|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

There is currently an experimental package <a href="https://github.com/fsnotify/fsnotify" rel="nofollow">here</a>. It should be merged into core as <code>os/fsnotify</code> in go1.3

I need to know how to detect when a file changes using Go. I know that Unix provides a function named <code>fcntl()</code> which notifies when a specific file is changed but I have not found this one in Go.
Please help me.

Go language how detect file changing?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我需要知道如何使用Go检测文件何时发生更改。我知道Unix提供了一个名为fcntl()的函数，它会在特定文件发生更改时发出通知，但我在Go中没有找到这个函数。请帮帮我。

问Go语言如何检测文件更改？
EN

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问Go语言如何检测文件更改？EN