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childprocess
============
This gem aims at being a simple and reliable solution for controlling
external programs running in the background on any Ruby / OS combination.
The code originated in the selenium-webdriver gem, but should prove useful as
a standalone library.
[](http://travis-ci.org/jarib/childprocess)
Usage
-----
```ruby
process = ChildProcess.build("ruby", "-e", "sleep")
# inherit stdout/stderr from parent...
process.io.inherit!
# ...or pass an IO
process.io.stdout = Tempfile.new("child-output")
# modify the environment for the child
process.environment["a"] = "b"
process.environment["c"] = nil
# start the process
process.start
# check process status
process.alive? #=> true
process.exited? #=> false
# wait indefinitely for process to exit...
process.wait
process.exited? #=> true
# ...or poll for exit + force quit
begin
process.poll_for_exit(10)
rescue ChildProcess::TimeoutError
process.stop # tries increasingly harsher methods to kill the process.
end
```
The object returned from ChildProcess.build will implement ChildProcess::AbstractProcess.
Implementation
--------------
How the process is launched and killed depends on the platform:
* Unix : fork + exec (or posix_spawn if enabled)
* Windows : CreateProcess and friends
* JRuby : java.lang.{Process,ProcessBuilder}
Note on Patches/Pull Requests
-----------------------------
* Fork the project.
* Make your feature addition or bug fix.
* Add tests for it. This is important so I don't break it in a
future version unintentionally.
* Commit, do not mess with rakefile, version, or history.
(if you want to have your own version, that is fine but bump version in a commit by itself I can ignore when I pull)
* Send me a pull request. Bonus points for topic branches.
Copyright
---------
Copyright (c) 2010-2012 Jari Bakken. See LICENSE for details.
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