[Chicken-janitors] #787: add socketpair call to unix-sockets egg

[Chicken Trac]

#787: add socketpair call to unix-sockets egg
-------------------------+--------------------------------------------------
 Reporter:  zbigniew     |       Owner:  felix
     Type:  enhancement  |      Status:  new  
 Priority:  minor        |   Milestone:       
Component:  extensions   |     Version:  4.7.x
 Keywords:  socketpair   |  
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 As requested by davidpk in #chicken, this patch implements socketpair() in
 unix-sockets.  The call is named {{{unix-pair}}}, but feel free to change
 this.

 There is a simple test program at http://paste.call-
 cc.org/paste?id=ddb14fa92a4821d9abdea55c736ca1b9db5bada1#a1 .

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Ticket URL: <http://bugs.call-cc.org/ticket/787>
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