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@node fchmodat
@section @code{fchmodat}
@findex fchmodat
POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/fchmodat.html}
Gnulib module: fchmodat
Portability problems fixed by Gnulib:
@itemize
@item
This function is missing on some platforms:
glibc 2.3.6, Mac OS X 10.5, FreeBSD 6.0, NetBSD 5.0, OpenBSD 3.8, Minix 3.1.8,
AIX 5.1, HP-UX 11, IRIX 6.5, Solaris 10, Cygwin 1.5.x, mingw, MSVC 14.
But the replacement function is not safe to be used in libraries and is not multithread-safe.
@item
This function does not fail when the file name argument ends in a slash
and (without the slash) names a non-directory, on some platforms:
AIX 7.2.
@item
When given the @code{AT_SYMLINK_NOFOLLOW} flag,
this function fails with @code{errno} set to @code{ENOTSUP},
even when the file is not a symbolic link:
GNU/Linux with glibc 2.31, Cygwin 2.9.
@end itemize
Portability problems not fixed by Gnulib:
@itemize
@item
Some platforms do not allow changing the access bits on symbolic
links.
@item
If the @code{AT_SYMLINK_NOFOLLOW} flag is specified,
this function can fail with @code{errno} set to @code{EMFILE} or @code{ENFILE},
and it fails with @code{errno} set to @code{EOPNOTSUPP} if the
@file{/proc} file system is not mounted:
GNU/Linux with glibc 2.34.
@end itemize
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