2 @section @code{faccessat}
5 POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/faccessat.html}
7 Gnulib module: faccessat
9 Portability problems fixed by Gnulib:
12 This function is missing on some platforms:
13 glibc 2.3.6, macOS 10.12, FreeBSD 7.4, NetBSD 6.1.5, OpenBSD 4.9, Minix 3.1.8, AIX 5.1, HP-UX 11, IRIX 6.5, Solaris 10, Cygwin 1.5.x, mingw, MSVC 14, Android 4.0.4.
15 On some platforms, @code{faccessat (dfd, "file/", amode, flag)}
16 succeeds instead of failing when @file{file} is not a directory.
20 Portability problems not fixed by Gnulib:
23 The replacement does not always take ACLs into account.
25 The replacement is not safe to be used in libraries.
27 The replacement is not multithread-safe.
29 The replacement does not support the @code{AT_SYMLINK_NOFOLLOW} flag,
30 which is supported by GNU @code{faccessat}.
32 On some platforms, @code{faccessat} can mishandle @code{AT_EACCESS}
33 after a process starts as root and then becomes non-root:
34 GNU/Linux with glibc 2.32.
35 @c This bug should be fixed in glibc 2.33. See:
36 @c https://sourceware.org/bugzilla/show_bug.cgi?id=18683
39 Other problems of this function:
42 There is an inherent race between calling this function and performing
43 some action based on the results; you should think twice before trusting
44 this function, especially in a set-uid or set-gid program.