popen bugs, popen_safer

[Eric Blake]

Even though Bruno's pipe module is generally a better
interface than popen, I discovered yet another popen
bug in cygwin today[1] (I fixed a cygwin popen bug in
August 2006, only to have it regress in December of
that year when cgf rewrote the implementation to be
faster).  So even though m4 no longer uses popen, I'm
at least going to write a popen replacement module,
and wondering if I should also add popen_safer in the
process.

[1] http://cygwin.com/ml/cygwin/2009-08/msg00582.html

-- 
Eric Blake

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