[Chicken-janitors] Re: #416: Make stock errors more usable programmatically

[Chicken Trac]

#416: Make stock errors more usable programmatically
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  Reporter:  syn             |       Owner:       
      Type:  enhancement     |      Status:  new  
  Priority:  minor           |   Milestone:  4.7.0
 Component:  core libraries  |     Version:  4.6.x
Resolution:                  |    Keywords:       
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Comment(by sjamaan):

 More to the point: I agree with Moritz that it would be a useful thing to
 have more informative error objects. Christian's suggestion of first
 checking if the file exists is a workaround and opens up a race condition.
 In C, you have errno which you can check for the various conditions.

 Maybe a simple way around this is adding the errno to the exception
 object, but that seems ugly and lazy :(

 Exhaustively checking all possible errno values for each call isn't very
 elegant either, especially since you'd need lots of #ifdefs for various
 platforms since everyone adds their own error conditions to errno...

 The compromise felix suggested sounds acceptable

-- 
Ticket URL: <http://bugs.call-cc.org/ticket/416#comment:4>
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