#41: implement ATF_REQUIRE_ERRNO

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#41: implement ATF_REQUIRE_ERRNO
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 Reporter:  pooka@...     |       Owner:  jmmv
     Type:  enhancement   |      Status:  new 
 Priority:  minor         |   Milestone:      
Component:  MISC          |     Version:      
 Keywords:                |  
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 Most of the lines in tests against system functionality are:

 if (syscall(args) == -1)
     atf_tc_fail_errno("flop")

 Some shorthand would be helpful, like

 ATF_REQUIRE_ERRNO(syscall(args))

 Also, a variant which allows arbitrary return value checks
 (e.g. "!= 0" or "< 124" or "!= size") would be nice.

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Ticket URL: <http://www.julipedia.org/projects/atf/trac/ticket/41>
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