linux: Move posix dir implementations to Linux

This generic implementation already expects a getdents API which
is Linux specific.  It also allows simplify it by assuming
_DIRENT_HAVE_D_RECLEN and _DIRENT_HAVE_D_OFF support.

The readdir are also expanded on each required implementation,
futher fixes and improvements will make parametrize the
implementation more complex.

Checked on x86_64-linux-gnu, i686-linux-gnu, and with a build
for all affected ABIs.

1 files changed, 0 insertions, 148 deletions

diff --git a/sysdeps/posix/opendir.c b/sysdeps/posix/opendir.c
deleted file mode 100644
index e89e09bfc7..0000000000
--- a/sysdeps/posix/opendir.c
+++ /dev/null
@@ -1,148 +0,0 @@
-/* Copyright (C) 1991-2020 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 <dirent.h>
-#include <fcntl.h>
-#include <errno.h>
-#include <stdio.h>	/* For BUFSIZ.  */
-#include <sys/param.h>	/* For MIN and MAX.  */
-
-#include <not-cancel.h>
-
-/* The st_blksize value of the directory is used as a hint for the
-   size of the buffer which receives struct dirent values from the
-   kernel.  st_blksize is limited to MAX_DIR_BUFFER_SIZE, in case the
-   file system provides a bogus value.  */
-#define MAX_DIR_BUFFER_SIZE 1048576U
-
-enum {
-  opendir_oflags = O_RDONLY|O_NDELAY|O_DIRECTORY|O_LARGEFILE|O_CLOEXEC
-};
-
-static bool
-invalid_name (const char *name)
-{
-  if (__glibc_unlikely (name[0] == '\0'))
-    {
-      /* POSIX.1-1990 says an empty name gets ENOENT;
-	 but `open' might like it fine.  */
-      __set_errno (ENOENT);
-      return true;
-    }
-  return false;
-}
-
-static DIR *
-opendir_tail (int fd)
-{
-  if (__glibc_unlikely (fd < 0))
-    return NULL;
-
-  /* Now make sure this really is a directory and nothing changed since the
-     `stat' call.  The S_ISDIR check is superfluous if O_DIRECTORY works,
-     but it's cheap and we need the stat call for st_blksize anyway.  */
-  struct stat64 statbuf;
-  if (__glibc_unlikely (__fstat64 (fd, &statbuf) < 0))
-    goto lose;
-  if (__glibc_unlikely (! S_ISDIR (statbuf.st_mode)))
-    {
-      __set_errno (ENOTDIR);
-    lose:
-      __close_nocancel_nostatus (fd);
-      return NULL;
-    }
-
-  return __alloc_dir (fd, true, 0, &statbuf);
-}
-
-
-#if IS_IN (libc)
-DIR *
-__opendirat (int dfd, const char *name)
-{
-  if (__glibc_unlikely (invalid_name (name)))
-    return NULL;
-
-  return opendir_tail (__openat_nocancel (dfd, name, opendir_oflags));
-}
-#endif
-
-
-/* Open a directory stream on NAME.  */
-DIR *
-__opendir (const char *name)
-{
-  if (__glibc_unlikely (invalid_name (name)))
-    return NULL;
-
-  return opendir_tail (__open_nocancel (name, opendir_oflags));
-}
-weak_alias (__opendir, opendir)
-
-DIR *
-__alloc_dir (int fd, bool close_fd, int flags, const struct stat64 *statp)
-{
-  /* We have to set the close-on-exit flag if the user provided the
-     file descriptor.  */
-  if (!close_fd
-      && __glibc_unlikely (__fcntl64_nocancel (fd, F_SETFD, FD_CLOEXEC) < 0))
-	goto lose;
-
-  const size_t default_allocation = (4 * BUFSIZ < sizeof (struct dirent64)
-				     ? sizeof (struct dirent64) : 4 * BUFSIZ);
-  const size_t small_allocation = (BUFSIZ < sizeof (struct dirent64)
-				   ? sizeof (struct dirent64) : BUFSIZ);
-  size_t allocation = default_allocation;
-#ifdef _STATBUF_ST_BLKSIZE
-  /* Increase allocation if requested, but not if the value appears to
-     be bogus.  */
-  if (statp != NULL)
-    allocation = MIN (MAX ((size_t) statp->st_blksize, default_allocation),
-		      MAX_DIR_BUFFER_SIZE);
-#endif
-
-  DIR *dirp = (DIR *) malloc (sizeof (DIR) + allocation);
-  if (dirp == NULL)
-    {
-      allocation = small_allocation;
-      dirp = (DIR *) malloc (sizeof (DIR) + allocation);
-
-      if (dirp == NULL)
-      lose:
-	{
-	  if (close_fd)
-	    {
-	      int save_errno = errno;
-	      __close_nocancel_nostatus (fd);
-	      __set_errno (save_errno);
-	    }
-	  return NULL;
-	}
-    }
-
-  dirp->fd = fd;
-#if IS_IN (libc)
-  __libc_lock_init (dirp->lock);
-#endif
-  dirp->allocation = allocation;
-  dirp->size = 0;
-  dirp->offset = 0;
-  dirp->filepos = 0;
-  dirp->errcode = 0;
-
-  return dirp;
-}