doc: more updates for glibc 2.32

* doc/glibc-functions/lchmod.texi, doc/posix-functions/faccessat.texi:
* doc/posix-functions/fchmodat.texi: Update.

3 files changed, 24 insertions, 2 deletions

diff --git a/doc/glibc-functions/lchmod.texi b/doc/glibc-functions/lchmod.texi
index d0ea7b995f..a85b38714c 100644
--- a/doc/glibc-functions/lchmod.texi
+++ b/doc/glibc-functions/lchmod.texi
@@ -15,9 +15,18 @@ HP-UX 11.31.
 @item
 This function always fails with @code{errno} set to @code{ENOSYS},
 even when the file is not a symbolic link:
-GNU/Linux with glibc 2.31 (or newer?).
+GNU/Linux with glibc 2.31.
 @end itemize
 
 Portability problems not fixed by Gnulib:
 @itemize
+@item
+Some platforms do not allow changing the access bits on symbolic
+links.
+
+@item
+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 2.32.
 @end itemize
diff --git a/doc/posix-functions/faccessat.texi b/doc/posix-functions/faccessat.texi
index a3c21cff0d..5d5165e474 100644
--- a/doc/posix-functions/faccessat.texi
+++ b/doc/posix-functions/faccessat.texi
@@ -28,6 +28,12 @@ The replacement is not multithread-safe.
 @item
 The replacement does not support the @code{AT_SYMLINK_NOFOLLOW} flag,
 which is supported by GNU @code{faccessat}.
+@item
+On some platforms, @code{faccessat} can mishandle @code{AT_EACCESS}
+after a process starts as root and then becomes non-root:
+GNU/Linux with glibc 2.32.
+@c This bug should be fixed in glibc 2.33.  See:
+@c https://sourceware.org/bugzilla/show_bug.cgi?id=18683
 @end itemize
 
 Other problems of this function:
diff --git a/doc/posix-functions/fchmodat.texi b/doc/posix-functions/fchmodat.texi
index d0cdeb08f8..10821b63e5 100644
--- a/doc/posix-functions/fchmodat.texi
+++ b/doc/posix-functions/fchmodat.texi
@@ -17,7 +17,7 @@ But the replacement function is not safe to be used in libraries and is not mult
 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 (or newer?), Cygwin 2.9.
+GNU/Linux with glibc 2.31, Cygwin 2.9.
 @end itemize
 
 Portability problems not fixed by Gnulib:
@@ -25,4 +25,11 @@ Portability problems not fixed by Gnulib:
 @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 2.32.
 @end itemize