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fchmodat
POSIX specification:
http://www.opengroup.org/onlinepubs/9699919799/functions/fchmodat.html
Gnulib module: fchmodat
Portability problems fixed by Gnulib:
Portability problems not fixed by Gnulib:
fchmodat(…,AT_SYMLINK_NOFOLLOW)
may fail with EOPNOTSUPP
when called on a symlink, but some
platforms, as well as the gnulib replacement, fail for any use of
AT_SYMLINK_NOFOLLOW even if the target was not a symlink:
glibc, Cygwin.