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Add tests for unistd.h constants

Peter Limkilde Svendsen requested to merge plimkilde/relibc:unistd-constants into master

This adds tests for the constants specified in https://pubs.opengroup.org/onlinepubs/7908799/xsh/unistd.h.html (apart from those relevant for pathconf() and sysconf(). Currently, many constants are not yet implemented and thus commented out.

For many of these constants, POSIX does not specify a particular value, though I guess it is ok to lock in their value with an expected-value test. For the constants that relibc does provide, the values are the same as in glibc. On my machine, glibc provides all of the constants commented out, except:

  • _POSIX2_FORT_DEV
  • _POSIX2_FORT_RUN
  • _POSIX2_UPE
  • _XOPEN_CRYPT
  • _XBS5_ILP32_OFF32
  • _XBS5_ILP32_OFFBIG
  • _POSIX_PRIO_IO
  • _POSIX_SYNC_IO

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