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#
# = open3.rb: Popen, but with stderr, too
#
# Author:: Yukihiro Matsumoto
# Documentation:: Konrad Meyer
#
# Open3 gives you access to stdin, stdout, and stderr when running other
# programs.
#
#
# Open3 grants you access to stdin, stdout, and stderr when running another
# program. Example:
#
# require "open3"
# include Open3
#
# stdin, stdout, stderr = popen3('nroff -man')
#
# Open3.popen3 can also take a block which will receive stdin, stdout and
# stderr as parameters. This ensures stdin, stdout and stderr are closed
# once the block exits. Example:
#
# require "open3"
#
# Open3.popen3('nroff -man') { |stdin, stdout, stderr| ... }
#
module Open3
#
# Open stdin, stdout, and stderr streams and start external executable.
# Non-block form:
#
# require 'open3'
#
# stdin, stdout, stderr = Open3.popen3(cmd)
#
# Block form:
#
# require 'open3'
#
# Open3.popen3(cmd) { |stdin, stdout, stderr| ... }
#
# The parameter +cmd+ is passed directly to Kernel#exec.
#
def popen3(*cmd, &p)
IO::popen3(*cmd, &p)
# pw = IO::pipe # pipe[0] for read, pipe[1] for write
# pr = IO::pipe
# pe = IO::pipe
#
# pid = fork{
# # child
# fork{
# # grandchild
# pw[1].close
# STDIN.reopen(pw[0])
# pw[0].close
#
# pr[0].close
# STDOUT.reopen(pr[1])
# pr[1].close
#
# pe[0].close
# STDERR.reopen(pe[1])
# pe[1].close
#
# exec(*cmd)
# }
# exit!(0)
# }
#
# pw[0].close
# pr[1].close
# pe[1].close
# Process.waitpid(pid)
# pi = [pw[1], pr[0], pe[0]]
# pw[1].sync = true
# if defined? yield
# begin
# return yield(*pi)
# ensure
# pi.each{|p| p.close unless p.closed?}
# end
# end
# pi
end
module_function :popen3
end
if $0 == __FILE__
a = Open3.popen3("nroff -man")
Thread.start do
while line = gets
a[0].print line
end
a[0].close
end
while line = a[1].gets
print ":", line
end
end
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