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# Usage:
# require "open3"
#
# in, out, err = Open3.popen3('nroff -man')
# or
# include Open3
# in, out, err = popen3('nroff -man')
#
module Open3
#[stdin, stdout, stderr] = popen3(command);
def popen3(cmd)
pw = IO::pipe # pipe[0] for read, pipe[1] for write
pr = IO::pipe
pe = IO::pipe
pid = fork
if pid == nil then # child
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
else
pw[0].close
pr[1].close
pe[1].close
pi = [ pw[1], pr[0], pe[0] ]
end
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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