Subexec spawns an subprocess with an optional timeout
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README.md

Subexec

by Peter Kieltyka http://github/nulayer/subexec

Description

Subexec is a simple library that spawns an external command with an optional timeout parameter. It relies on Ruby 1.9's Process.spawn method. Also, it works with synchronous and asynchronous code.

Useful for libraries that are Ruby wrappers for CLI's. For example, resizing images with ImageMagick's mogrify command sometimes stalls and never returns control back to the original process. Enter Subexec.

Tested with MRI 1.9.3, 1.9.2, 1.8.7

Usage

sub = Subexec.run "echo 'hello' && sleep 3", :timeout => 5
puts sub.output     # returns: hello
puts sub.exitstatus # returns: 0

sub = Subexec.run "echo 'hello' && sleep 3", :timeout => 1
puts sub.output     # returns: 
puts sub.exitstatus # returns:`

Limitations

Only Ruby 1.9 can spawn non-blocking subprocesses, via Process.spawn. So Ruby 1.8 support is sheerly for backwards compatibility.

Windows Support

Limited Windows support is available. If someone would like to sponsor windows compatibility, we are more than happy to accept patches. However, our tests are run on Unix-like operating systems. Primarily, the intended effect should be that Subexec works on Windows, though it may not give many advantages.