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# File 'lib/open4.rb', line 55
def self.do_popen(b = nil, exception_propagation_at = nil, closefds=false, &cmd)
pw, pr, pe, ps = IO.pipe, IO.pipe, IO.pipe, IO.pipe
verbose = $VERBOSE
begin
$VERBOSE = nil
cid = fork {
if closefds
exlist = [0, 1, 2] | [pw,pr,pe,ps].map{|p| [p.first.fileno, p.last.fileno] }.flatten
ObjectSpace.each_object(IO){|io|
io.close if (not io.closed?) and (not exlist.include? io.fileno) rescue nil
}
end
pw.last.close
STDIN.reopen pw.first
pw.first.close
pr.first.close
STDOUT.reopen pr.last
pr.last.close
pe.first.close
STDERR.reopen pe.last
pe.last.close
STDOUT.sync = STDERR.sync = true
begin
cmd.call(ps)
rescue Exception => e
Marshal.dump(e, ps.last)
ps.last.flush
ensure
ps.last.close unless ps.last.closed?
end
exit!
}
ensure
$VERBOSE = verbose
end
[ pw.first, pr.last, pe.last, ps.last ].each { |fd| fd.close }
Open4.propagate_exception cid, ps.first if exception_propagation_at == :init
pw.last.sync = true
pi = [ pw.last, pr.first, pe.first ]
begin
return [cid, *pi] unless b
begin
b.call(cid, *pi)
ensure
pi.each { |fd| fd.close unless fd.closed? }
end
Open4.propagate_exception cid, ps.first if exception_propagation_at == :block
Process.waitpid2(cid).last
ensure
ps.first.close unless ps.first.closed?
end
end
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