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fchmodat
POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/fchmodat.html
Gnulib module: fchmodat
Portability problems fixed by Gnulib:
AT_SYMLINK_NOFOLLOW
flag,
this function fails with errno
set to ENOTSUP
,
even when the file is not a symbolic link:
GNU/Linux with glibc 2.31, Cygwin 2.9.
Portability problems not fixed by Gnulib:
AT_SYMLINK_NOFOLLOW
flag is specified,
this function can fail with errno
set to EMFILE
or ENFILE
,
and it fails with errno
set to EOPNOTSUPP
if the
/proc file system is not mounted:
GNU/Linux with glibc 2.34.