#37: Add macros to check for errno

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#37: Add macros to check for errno
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 Reporter:  jmmv         |       Owner:  jmmv
     Type:  enhancement  |      Status:  new 
 Priority:  minor        |   Milestone:      
Component:  atf-c        |     Version:      
 Keywords:               |  
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 Many tests call standard C functions that return a an error indicator and
 update errno with more information about the error.

 It'd be nice to have some macros to simplify this process.  One issue is,
 I think, that we can't assume all functions that update errno return -1 on
 failure.  So we may need to do something like:

 ATF_REQUIRE_ERRNO_EQ(expected errno, boolean expression);

 where the boolean expression is just a call to a function compared against
 -1.  For example:

 ATF_REQUIRE_ERRNO_EQ(ENOENT, open("non-existent", O_RDONLY) == -1);

-- 
Ticket URL: <https://www.julipedia.org/projects/atf/trac/ticket/37>
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