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dirfd
POSIX specification:
http://www.opengroup.org/onlinepubs/9699919799/functions/dirfd.html
Gnulib module: dirfd
Portability problems fixed by Gnulib:
Portability problems not fixed by Gnulib:
With the dirfd
module, this functions always sets errno
when it
fails. (POSIX does not require that dirfd
sets errno
when it
fails.)