POpen4 provides the Rubyist a single API across platforms for executing a command in a child process with handles on stdout, stderr, stdin streams as well as access to the process ID and exit status. It does very little other than to provide an easy way to use either. Source by John-Mason P. Shackelford
Home Page: http://popen4.rubyforge.org
License: Other
I get the below error when I try to require popen4 on Windows with Ruby v1.9.3-p362.
Why isn't win32-open3 a dependency of popen4?
C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- win32/open3 (LoadError)
If I run the below command on Windows (Ruby 1.9.3-p362) -
status = POpen4::popen4("dir") do |stdout, stderr, stdin, pid|
puts "pid : #{ pid }"
puts "stdout : #{ stdout.read.strip }"
puts "stderr : #{ stderr.read.strip }"
end
I get the below error -
ruby build\SubProcess.rb
pid : 6884
stdout : Volume in drive C has no label.
Volume Serial Number is FEB9-0047
Directory of C:\
stderr : File Not Found
C:/Ruby193/lib/ruby/gems/1.9.1/gems/POpen4-0.1.4/lib/popen4.rb:60:in `rewind': Invalid argument (Errno::EINVAL)
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/POpen4-0.1.4/lib/popen4.rb:60:in `block in popen4'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/win32-open3-19-0.0.2/lib/win32/open3.rb:6:in `call'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/win32-open3-19-0.0.2/lib/win32/open3.rb:6:in `block in popen4'
from C:/Ruby193/lib/ruby/1.9.1/open3.rb:208:in `popen_run'
from C:/Ruby193/lib/ruby/1.9.1/open3.rb:90:in `popen3'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/win32-open3-19-0.0.2/lib/win32/open3.rb:5:in `popen4'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/POpen4-0.1.4/lib/popen4.rb:48:in `popen4'
from build/SubProcess.rb:66:in `<main>'
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