[glibc/fw/librt] rt: Replace generic stub of shm_unlink with the posix version

[glibc/fw/librt] rt: Replace generic stub of shm_unlink with the posix version

[Florian Weimer]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=4b3ec6e7e7ecfb243625e2ab1038f8666567d220

commit 4b3ec6e7e7ecfb243625e2ab1038f8666567d220
Author: Florian Weimer <fweimer@redhat.com>
Date:   Wed Jun 2 20:21:15 2021 +0200

    rt: Replace generic stub of shm_unlink with the posix version
    
    Result of: git mv -f sysdeps/posix/shm_unlink.c rt
    and manual removal of the _POSIX_MAPPED_FILES preprocessor condition.

Diff:
---
 rt/shm_unlink.c            | 21 +++++++++++++++-----
 sysdeps/posix/shm_unlink.c | 48 ----------------------------------------------
 2 files changed, 16 insertions(+), 53 deletions(-)

diff --git a/rt/shm_unlink.c b/rt/shm_unlink.c
index 27c10d9dee..a5af5ac147 100644
--- a/rt/shm_unlink.c
+++ b/rt/shm_unlink.c
@@ -1,4 +1,5 @@
-/* Copyright (C) 2000-2021 Free Software Foundation, Inc.
+/* shm_unlink -- remove a POSIX shared memory object.  Generic POSIX version.
+   Copyright (C) 2001-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -16,13 +17,23 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <errno.h>
-#include <sys/mman.h>
+#include <shm-directory.h>
+#include <string.h>
+#include <unistd.h>
 
 /* Remove shared memory object.  */
 int
 shm_unlink (const char *name)
 {
-  __set_errno (ENOSYS);
-  return -1;
+  struct shmdir_name dirname;
+  if (__shm_get_name (&dirname, name, false) != 0)
+    {
+      __set_errno (ENOENT);
+      return -1;
+    }
+
+  int result = unlink (dirname.name);
+  if (result < 0 && errno == EPERM)
+    __set_errno (EACCES);
+  return result;
 }
-stub_warning (shm_unlink)
diff --git a/sysdeps/posix/shm_unlink.c b/sysdeps/posix/shm_unlink.c
deleted file mode 100644
index c90b854c78..0000000000
--- a/sysdeps/posix/shm_unlink.c
+++ /dev/null
@@ -1,48 +0,0 @@
-/* shm_unlink -- remove a POSIX shared memory object.  Generic POSIX version.
-   Copyright (C) 2001-2021 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <https://www.gnu.org/licenses/>.  */
-
-#include <unistd.h>
-
-#if ! _POSIX_MAPPED_FILES
-#include <rt/shm_unlink.c>
-
-#else
-
-#include <errno.h>
-#include <string.h>
-#include <shm-directory.h>
-
-
-/* Remove shared memory object.  */
-int
-shm_unlink (const char *name)
-{
-  struct shmdir_name dirname;
-  if (__shm_get_name (&dirname, name, false) != 0)
-    {
-      __set_errno (ENOENT);
-      return -1;
-    }
-
-  int result = unlink (dirname.name);
-  if (result < 0 && errno == EPERM)
-    __set_errno (EACCES);
-  return result;
-}
-
-#endif