On Wed, Dec 9, 2009 at 6:00 PM, Brandon S. Allbery KF8NH < allb...@ece.cmu.edu> wrote:
> On Dec 9, 2009, at 16:51 , Bas van Dijk wrote: > >> I will change the types to: >> >> stdin :: Handle ReadMode >> stdout :: Handle WriteMode >> stderr :: Handle WriteMode >> >> Or are there scenarios where people want to write to stdin or read >> from stdout or stderr? >> > > > These situations *do* come up; the controlling terminal for a program is > open read/write on all 3 file descriptors initially, ands programs like > more/less/pg rely on this and do their I/O on stdout. Additionally, on *BSD > pipes are actually socketpairs and therefore bidirectional, and a small > number of programs rely on this. > I was surprised to hear this, so I did some fact checking: http://books.google.com/books?id=rHyMRyDEG3gC&pg=PA39&lpg=PA39&dq=posix+write+to+stdin&source=bl&ots=vHsgioIR8J&sig=PPXTzuwuuxyx_peCnuSNVmE220I&hl=en&ei=o6cgS-DxJ5S0sgPSl82kBQ&sa=X&oi=book_result&ct=result&resnum=3&ved=0CA8Q6AEwAjgK#v=onepage&q=&f=false Looks like you're telling the truth. Learn something new every time I read Haskell-Cafe :) Jason
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