# Filelocking

**URL:** <https://www.ruby-forum.com/t/filelocking/165098>\
**Category:** Ruby\
**Created:** [April 9, 2009, 3:07am UTC](https://www.ruby-forum.com/t/filelocking/165098 "2009-04-09T03:07:57Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![bloodniece](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/47e85d/32.png) [@bloodniece](https://www.ruby-forum.com/u/bloodniece)\
**Post date:** [April 9, 2009, 3:07am UTC](https://www.ruby-forum.com/t/filelocking/165098/1 "2009-04-09T03:07:57Z")

</div>

Hi All,

I have posted the same code b4, but could not find my original post,  
however this is a different question. I am a newb, so here I go.  
Thank you!

This is my error:

$ ruby test.rb  
test.rb:46: undefined method `flock' for main:Object (NoMethodError) from test.rb:45:in`open’  
from test.rb:45  
from test.rb:42:in `each’  
from test.rb:42

Here is my code:

#!/usr/bin/ruby -w

require ‘ftools’  
array1 = Dir.glob("\*.log")  
if ( array1.length \>= 1 )  
array1.each { |file|  
File.copy(file, “#{file}.orig”)  
if (File.size?(file) \> FSIZE)  
File.open(file, ‘r+’) do |f|  
flock(f, File::LOCK\_SH) do |f|  
f \<\< “i got a lock”  
end  
end  
end  
}  
else  
raise StandardError, “Array ‘array1’ has no values, logs will not be  
rolled!”  
end

---

<div class="post-metadata">

**Author:** ![bloodniece](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/47e85d/32.png) [@bloodniece](https://www.ruby-forum.com/u/bloodniece)\
**Post date:** [April 9, 2009, 3:15am UTC](https://www.ruby-forum.com/t/filelocking/165098/2 "2009-04-09T03:15:47Z")

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Derek S. wrote:

> test.rb:46: undefined method `flock’ for main:Object (NoMethodError)  
> …  
> File.open(file, ‘r+’) do |f|  
> flock(f, File::LOCK\_SH) do |f|

That should be File.flock.

---

<div class="post-metadata">

**Author:** ![bloodniece](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/47e85d/32.png) [@bloodniece](https://www.ruby-forum.com/u/bloodniece)\
**Post date:** [April 9, 2009, 3:27am UTC](https://www.ruby-forum.com/t/filelocking/165098/3 "2009-04-09T03:27:08Z")

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Joel VanderWerf wrote:

> Derek S. wrote:
> 
> > test.rb:46: undefined method `flock’ for main:Object (NoMethodError)  
> > …  
> > File.open(file, ‘r+’) do |f|  
> > flock(f, File::LOCK\_SH) do |f|
> 
> That should be File.flock.

OK tried that…thx!, but now I am seeing

**STDERR**

test.rb:46: undefined method `flock' for File:Class (NoMethodError) from test.rb:45:in`open’  
from test.rb:45  
from test.rb:42:in `each’  
from test.rb:42

**CODE**

if ( array1.length \>= 1 )  
array1.each { |file|  
File.copy(file, “#{file}.orig”)  
if (File.size?(file) \> FSIZE)  
File.open(file, ‘r+’) do |f|  
File.flock(f, File::LOCK\_SH) do |f|  
f \<\< “i got a lock”  
end  
end  
end  
}  
else  
raise StandardError, “Array ‘array1’ has no values, logs will not be  
rolled!”  
end

---

<div class="post-metadata">

**Author:** ![bloodniece](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/47e85d/32.png) [@bloodniece](https://www.ruby-forum.com/u/bloodniece)\
**Post date:** [April 9, 2009, 3:36am UTC](https://www.ruby-forum.com/t/filelocking/165098/4 "2009-04-09T03:36:55Z")

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Derek S. wrote:

> Joel VanderWerf wrote:
> 
> > Derek S. wrote:
> > 
> > > test.rb:46: undefined method `flock’ for main:Object (NoMethodError)  
> > > …  
> > > File.open(file, ‘r+’) do |f|  
> > > flock(f, File::LOCK\_SH) do |f|  
> > > That should be File.flock.

sorry, my fault… should be

f.flock(File::LOCK\_SH) do  
…  
end

Take a look at `ri flock` for details.

---

<div class="post-metadata">

**Author:** ![bloodniece](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/47e85d/32.png) [@bloodniece](https://www.ruby-forum.com/u/bloodniece)\
**Post date:** [April 9, 2009, 3:40am UTC](https://www.ruby-forum.com/t/filelocking/165098/5 "2009-04-09T03:40:25Z")

</div>

> ```
> from test.rb:45
> from test.rb:42:in `each'
> from test.rb:42
> 
> ```

File#flock =\> f.flock

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