[PATCH v3 7/7] dirent: Deprecate getdirentries

[Adhemerval Zanella <adhemerval.zanella@linaro.org>]

The interface has some issues:

  1. It is build on top getdents on Linux and requires handling
     non-LFS call using LFS getdents.

  2. It is not wildly used and the non-LFS support is as problematic
     as non-LFS readdir.  glibc only exports the LFS getdents.

  3. It is not a direct replacement over BSD since on some plataform
     its signature has changed (FreeBSD 11, for instance, used to
     set the offset as a 'long' and changed to 'off_t' on version 12).

The idea is to eventually move the symbols to compat ones.
---
 NEWS                             |  3 +++
 dirent/dirent.h                  | 14 ++++++++++----
 sysdeps/unix/sysv/linux/Makefile |  3 +++
 3 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/NEWS b/NEWS
index 3c1e509744..63623dcee2 100644
--- a/NEWS
+++ b/NEWS
@@ -47,6 +47,9 @@ Deprecated and removed features, and other changes affecting compatibility:
   as a compatibility symbol.  Applications should use the getrlimit or
   prlimit.
 
+* The function getdirentries is now deprecated, applications should use
+  either getdents64, readdir64 or readdir.
+
 Changes to build and runtime requirements:
 
 * On Linux, the system administrator needs to configure /dev/pts with
diff --git a/dirent/dirent.h b/dirent/dirent.h
index 92d0925047..62bb77b4e1 100644
--- a/dirent/dirent.h
+++ b/dirent/dirent.h
@@ -348,29 +348,35 @@ extern int alphasort64 (const struct dirent64 **__e1,
 /* Read directory entries from FD into BUF, reading at most NBYTES.
    Reading starts at offset *BASEP, and *BASEP is updated with the new
    position after reading.  Returns the number of bytes read; zero when at
-   end of directory; or -1 for errors.  */
+   end of directory; or -1 for errors.
+   This is deprecated and getdents64 or readdir should be used instead.  */
 # ifndef __USE_FILE_OFFSET64
 extern __ssize_t getdirentries (int __fd, char *__restrict __buf,
 				size_t __nbytes,
 				__off_t *__restrict __basep)
-     __THROW __nonnull ((2, 4));
+     __THROW __nonnull ((2, 4))
+     __attribute_deprecated_msg__ ("Use getdents64 instead");
 # else
 #  ifdef __REDIRECT
 extern __ssize_t __REDIRECT_NTH (getdirentries,
 				 (int __fd, char *__restrict __buf,
 				  size_t __nbytes,
 				  __off64_t *__restrict __basep),
-				 getdirentries64) __nonnull ((2, 4));
+				 getdirentries64)
+     __THROW __nonnull ((2, 4))
+     __attribute_deprecated_msg__ ("Use getdents64 instead");
 #  else
 #   define getdirentries getdirentries64
 #  endif
 # endif
 
 # ifdef __USE_LARGEFILE64
+/* This is deprecated and getdents64 or readdir64 should be used instead.  */
 extern __ssize_t getdirentries64 (int __fd, char *__restrict __buf,
 				  size_t __nbytes,
 				  __off64_t *__restrict __basep)
-     __THROW __nonnull ((2, 4));
+     __THROW __nonnull ((2, 4))
+     __attribute_deprecated_msg__ ("Use getdents64 instead");
 # endif
 #endif /* Use misc.  */
 
diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
index 09604e128b..242b07734f 100644
--- a/sysdeps/unix/sysv/linux/Makefile
+++ b/sysdeps/unix/sysv/linux/Makefile
@@ -262,6 +262,9 @@ ifeq ($(subdir),dirent)
 sysdep_routines += getdirentries getdirentries64
 tests += tst-getdents64
 tests-internal += tst-readdir64-compat
+
+# Avoid the warning for the weak_alias for _DIRENT_MATCHES_DIRENT64
+CFLAGS-getdirentries64.c = -Wno-deprecated-declarations
 endif
 
 ifeq ($(subdir),nis)
-- 
2.25.1