From: "hsbt (Hiroshi SHIBATA) via ruby-core" <ruby-core@...>
Date: 2024-12-03T06:49:37+00:00
Subject: [ruby-core:120085] [Ruby master Bug#20795] Timeout method doesn't check for negative time values

Issue #20795 has been updated by hsbt (Hiroshi SHIBATA).


We discussed this with Matz at last developer meeting.

He said "Let's raise an `ArgumentError` against negative value". 

----------------------------------------
Bug #20795: Timeout method doesn't check for negative time values
https://bugs.ruby-lang.org/issues/20795#change-110834

* Author: kanakchaudhari12 (kanak chaudhari)
* Status: Open
* ruby -v: 3.1.0
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
```ruby
require 'timeout'

# Case 1: Negative timeout with quick execution
Timeout.timeout(-5) do
  puts "This should not execute"
end

# Case 2: Negative timeout with sleep
Timeout.timeout(-5) do
  sleep(10)
end

```


Potential issues with current behaviour:

* Inconsistency: The behaviour differs based on the block's content, which may not be immediately apparent 
* Silent failure: The negative timeout is silently ignored, potentially masking logical errors in the calling code.
* Unexpected source of error: one might expect the timeout method to validate its input, rather than relying on methods called within the block to catch invalid time values.

I suggest this change for the consistent behaviour regardless of code-block as well as the clear indication of the source of the error

```ruby
def timeout(sec, klass = nil, message = nil, &block)
  raise ArgumentError, "timeout must be positive" if sec.is_a?(Numeric) && sec < 0
  # ...
end
```



-- 
https://bugs.ruby-lang.org/
 ______________________________________________
 ruby-core mailing list -- ruby-core@ml.ruby-lang.org
 To unsubscribe send an email to ruby-core-leave@ml.ruby-lang.org
 ruby-core info -- https://ml.ruby-lang.org/mailman3/lists/ruby-core.ml.ruby-lang.org/