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Diffstat (limited to 'sysdeps/unix/sysv/linux/pathconf.c')
-rw-r--r--sysdeps/unix/sysv/linux/pathconf.c293
1 files changed, 0 insertions, 293 deletions
diff --git a/sysdeps/unix/sysv/linux/pathconf.c b/sysdeps/unix/sysv/linux/pathconf.c
deleted file mode 100644
index 01d8c2bedd..0000000000
--- a/sysdeps/unix/sysv/linux/pathconf.c
+++ /dev/null
@@ -1,293 +0,0 @@
-/* Get file-specific information about a file. Linux version.
- Copyright (C) 1991-2017 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
- <http://www.gnu.org/licenses/>. */
-
-#include <errno.h>
-#include <mntent.h>
-#include <stdio_ext.h>
-#include <string.h>
-#include <unistd.h>
-#include <sys/sysmacros.h>
-
-#include "pathconf.h"
-#include "linux_fsinfo.h"
-#include <not-cancel.h>
-
-static long int posix_pathconf (const char *file, int name);
-
-/* Define this first, so it can be inlined. */
-#define __pathconf static posix_pathconf
-#include <sysdeps/posix/pathconf.c>
-
-
-/* Get file-specific information about FILE. */
-long int
-__pathconf (const char *file, int name)
-{
- struct statfs fsbuf;
-
- switch (name)
- {
- case _PC_LINK_MAX:
- return __statfs_link_max (__statfs (file, &fsbuf), &fsbuf, file, -1);
-
- case _PC_FILESIZEBITS:
- return __statfs_filesize_max (__statfs (file, &fsbuf), &fsbuf);
-
- case _PC_2_SYMLINKS:
- return __statfs_symlinks (__statfs (file, &fsbuf), &fsbuf);
-
- case _PC_CHOWN_RESTRICTED:
- return __statfs_chown_restricted (__statfs (file, &fsbuf), &fsbuf);
-
- default:
- return posix_pathconf (file, name);
- }
-}
-
-
-static long int
-distinguish_extX (const struct statfs *fsbuf, const char *file, int fd)
-{
- char buf[64];
- char path[PATH_MAX];
- struct stat64 st;
-
- if ((file == NULL ? fstat64 (fd, &st) : stat64 (file, &st)) != 0)
- /* Strange. The statfd call worked, but stat fails. Default to
- the more pessimistic value. */
- return EXT2_LINK_MAX;
-
- __snprintf (buf, sizeof (buf), "/sys/dev/block/%u:%u",
- gnu_dev_major (st.st_dev), gnu_dev_minor (st.st_dev));
-
- ssize_t n = __readlink (buf, path, sizeof (path));
- if (n != -1 && n < sizeof (path))
- {
- path[n] = '\0';
- char *base = strdupa (__basename (path));
- __snprintf (path, sizeof (path), "/sys/fs/ext4/%s", base);
-
- return __access (path, F_OK) == 0 ? EXT4_LINK_MAX : EXT2_LINK_MAX;
- }
-
- /* XXX Is there a better way to distinguish ext2/3 from ext4 than
- iterating over the mounted filesystems and compare the device
- numbers? */
- FILE *mtab = __setmntent ("/proc/mounts", "r");
- if (mtab == NULL)
- mtab = __setmntent (_PATH_MOUNTED, "r");
-
- /* By default be conservative. */
- long int result = EXT2_LINK_MAX;
- if (mtab != NULL)
- {
- struct mntent mntbuf;
- char tmpbuf[1024];
-
- /* No locking needed. */
- (void) __fsetlocking (mtab, FSETLOCKING_BYCALLER);
-
- while (__getmntent_r (mtab, &mntbuf, tmpbuf, sizeof (tmpbuf)))
- {
- if (strcmp (mntbuf.mnt_type, "ext2") != 0
- && strcmp (mntbuf.mnt_type, "ext3") != 0
- && strcmp (mntbuf.mnt_type, "ext4") != 0)
- continue;
-
- struct stat64 fsst;
- if (stat64 (mntbuf.mnt_dir, &fsst) >= 0
- && st.st_dev == fsst.st_dev)
- {
- if (strcmp (mntbuf.mnt_type, "ext4") == 0)
- result = EXT4_LINK_MAX;
- break;
- }
- }
-
- /* Close the file. */
- __endmntent (mtab);
- }
-
- return result;
-}
-
-
-/* Used like: return statfs_link_max (__statfs (name, &buf), &buf); */
-long int
-__statfs_link_max (int result, const struct statfs *fsbuf, const char *file,
- int fd)
-{
- if (result < 0)
- {
- if (errno == ENOSYS)
- /* Not possible, return the default value. */
- return LINUX_LINK_MAX;
-
- /* Some error occured. */
- return -1;
- }
-
- switch (fsbuf->f_type)
- {
- case EXT2_SUPER_MAGIC:
- /* Unfortunately the kernel does not return a different magic number
- for ext4. This would be necessary to easily detect etx4 since it
- has a different LINK_MAX value. Therefore we have to find it out
- the hard way. */
- return distinguish_extX (fsbuf, file, fd);
-
- case F2FS_SUPER_MAGIC:
- return F2FS_LINK_MAX;
-
- case MINIX_SUPER_MAGIC:
- case MINIX_SUPER_MAGIC2:
- return MINIX_LINK_MAX;
-
- case MINIX2_SUPER_MAGIC:
- case MINIX2_SUPER_MAGIC2:
- return MINIX2_LINK_MAX;
-
- case XENIX_SUPER_MAGIC:
- return XENIX_LINK_MAX;
-
- case SYSV4_SUPER_MAGIC:
- case SYSV2_SUPER_MAGIC:
- return SYSV_LINK_MAX;
-
- case COH_SUPER_MAGIC:
- return COH_LINK_MAX;
-
- case UFS_MAGIC:
- case UFS_CIGAM:
- return UFS_LINK_MAX;
-
- case REISERFS_SUPER_MAGIC:
- return REISERFS_LINK_MAX;
-
- case XFS_SUPER_MAGIC:
- return XFS_LINK_MAX;
-
- case LUSTRE_SUPER_MAGIC:
- return LUSTRE_LINK_MAX;
-
- default:
- return LINUX_LINK_MAX;
- }
-}
-
-
-/* Used like: return statfs_filesize_max (__statfs (name, &buf), &buf); */
-long int
-__statfs_filesize_max (int result, const struct statfs *fsbuf)
-{
- if (result < 0)
- {
- if (errno == ENOSYS)
- /* Not possible, return the default value. */
- return 32;
-
- /* Some error occured. */
- return -1;
- }
-
- switch (fsbuf->f_type)
- {
- case F2FS_SUPER_MAGIC:
- return 256;
-
- case BTRFS_SUPER_MAGIC:
- return 255;
-
- case EXT2_SUPER_MAGIC:
- case UFS_MAGIC:
- case UFS_CIGAM:
- case REISERFS_SUPER_MAGIC:
- case XFS_SUPER_MAGIC:
- case SMB_SUPER_MAGIC:
- case NTFS_SUPER_MAGIC:
- case UDF_SUPER_MAGIC:
- case JFS_SUPER_MAGIC:
- case VXFS_SUPER_MAGIC:
- case CGROUP_SUPER_MAGIC:
- case LUSTRE_SUPER_MAGIC:
- return 64;
-
- case MSDOS_SUPER_MAGIC:
- case JFFS_SUPER_MAGIC:
- case JFFS2_SUPER_MAGIC:
- case NCP_SUPER_MAGIC:
- case ROMFS_SUPER_MAGIC:
- return 32;
-
- default:
- return 32;
- }
-}
-
-
-/* Used like: return statfs_link_max (__statfs (name, &buf), &buf); */
-long int
-__statfs_symlinks (int result, const struct statfs *fsbuf)
-{
- if (result < 0)
- {
- if (errno == ENOSYS)
- /* Not possible, return the default value. */
- return 1;
-
- /* Some error occured. */
- return -1;
- }
-
- switch (fsbuf->f_type)
- {
- case ADFS_SUPER_MAGIC:
- case BFS_MAGIC:
- case CRAMFS_MAGIC:
- case DEVPTS_SUPER_MAGIC:
- case EFS_SUPER_MAGIC:
- case EFS_MAGIC:
- case MSDOS_SUPER_MAGIC:
- case NTFS_SUPER_MAGIC:
- case QNX4_SUPER_MAGIC:
- case ROMFS_SUPER_MAGIC:
- /* No symlink support. */
- return 0;
-
- default:
- return 1;
- }
-}
-
-
-/* Used like: return __statfs_chown_restricted (__statfs (name, &buf), &buf);*/
-long int
-__statfs_chown_restricted (int result, const struct statfs *fsbuf)
-{
- if (result < 0)
- {
- if (errno == ENOSYS)
- /* Not possible, return the default value. */
- return 1;
-
- /* Some error occured. */
- return -1;
- }
-
- return 1;
-}
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