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Consolidate Linux getdents{64} implementation

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This patch consolidates Linux getdents{64} implementation on just
the default sysdeps/unix/sysv/linux/getdents{64}{_r}.c ones.

Although this symbol is used only internally, the non-LFS version
still need to be build due the non-LFS getdirentries which requires
its semantic.

The non-LFS default implementation now uses the wordsize-32 as base
which uses getdents64 syscall plus adjustment for overflow (it allows
to use the same code for architectures that does not support non-LFS
getdents syscall).  It has two main differences to wordsize-32 one:

  - DIRENT_SET_DP_INO is added to handle alpha requirement to zero
    the padding.

  - alloca is removed by allocating a bounded temporary buffer (it
    increases stack usage by roughly 276 bytes).

The default implementation handle the Linux requirements:

  * getdents is only built for _DIRENT_MATCHES_DIRENT64 being 0.

  * getdents64 is always built and aliased to getdents for ABIs
    that define _DIRENT_MATCHES_DIRENT64 to 1.

  * A compat symbol is added for getdents64 for ABI that used to
    export the old non-LFS version.

Checked on aarch64-linux-gnu, x86_64-linux-gnu, i686-linux-gnu,
sparcv9-linux-gnu, sparc64-linux-gnu, powerpc-linux-gnu, and
powerpc64le-linux-gnu.

	* sysdeps/unix/sysv/linux/alpha/getdents.c: Add comments with alpha
	requirements.
	 (_DIRENT_MATCHES_DIRENT64): Undef
	* sysdeps/unix/sysv/linux/alpha/getdents64.c: Likewise.
	* sysdeps/unix/sysv/linux/arm/getdents64.c: Remove file.
	* sysdeps/unix/sysv/linux/generic/getdents.c: Likewise.
	* sysdeps/unix/sysv/linux/generic/getdents64.c: Likewise.
	* sysdeps/unix/sysv/linux/generic/wordsize-32/getdents.c: Likewise.
	* sysdeps/unix/sysv/linux/getdents.c: Simplify implementation by
	use getdents64 syscalls as base.
	* sysdeps/unix/sysv/linux/getdents64.c: Likewise and add compatibility
	symbol if required.
	* sysdeps/unix/sysv/linux/hppa/getdents64.c: Likewise.
	* sysdeps/unix/sysv/linux/i386/getdents64.c: Likewise.
	* sysdeps/unix/sysv/linux/m68k/getdents64.c: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/getdents64.c: Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/getdents64.c: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc32/getdents64.c: Likewise.
	* sysdeps/unix/sysv/linux/wordsize-64/getdents.c: Likewise.
	* sysdeps/unix/sysv/linux/wordsize-64/getdents64.c: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc64/get_clockfreq.c
	(__get_clockfreq_via_proc_openprom): Use __getdents64.
	* sysdeps/unix/sysv/linux/mips/mips64/getdents64.c: New file.
This commit is contained in:
Adhemerval Zanella 2018-02-28 15:37:17 -03:00
parent 0085be1415
commit 298d0e3129
19 changed files with 316 additions and 449 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
ChangeLog
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@ -1,3 +1,29 @@
2018-04-19 Adhemerval Zanella <adhemerval.zanella@linaro.org>
* sysdeps/unix/sysv/linux/alpha/getdents.c: Add comments with alpha
requirements.
(_DIRENT_MATCHES_DIRENT64): Undef
* sysdeps/unix/sysv/linux/alpha/getdents64.c: Likewise.
* sysdeps/unix/sysv/linux/arm/getdents64.c: Remove file.
* sysdeps/unix/sysv/linux/generic/getdents.c: Likewise.
* sysdeps/unix/sysv/linux/generic/getdents64.c: Likewise.
* sysdeps/unix/sysv/linux/generic/wordsize-32/getdents.c: Likewise.
* sysdeps/unix/sysv/linux/getdents.c: Simplify implementation by
use getdents64 syscalls as base.
* sysdeps/unix/sysv/linux/getdents64.c: Likewise and add compatibility
symbol if required.
* sysdeps/unix/sysv/linux/hppa/getdents64.c: Likewise.
* sysdeps/unix/sysv/linux/i386/getdents64.c: Likewise.
* sysdeps/unix/sysv/linux/m68k/getdents64.c: Likewise.
* sysdeps/unix/sysv/linux/powerpc/getdents64.c: Likewise.
* sysdeps/unix/sysv/linux/s390/s390-32/getdents64.c: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc32/getdents64.c: Likewise.
* sysdeps/unix/sysv/linux/wordsize-64/getdents.c: Likewise.
* sysdeps/unix/sysv/linux/wordsize-64/getdents64.c: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc64/get_clockfreq.c
(__get_clockfreq_via_proc_openprom): Use __getdents64.
* sysdeps/unix/sysv/linux/mips/mips64/getdents64.c: New file.
2018-04-19 Stefan Liebler <stli@linux.vnet.ibm.com>
* scripts/test_printers_common.py (init_test): Disable lock elision.

8
sysdeps/unix/sysv/linux/alpha/getdents.c
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@ -1,3 +1,11 @@
/* Although Alpha defines _DIRENT_MATCHES_DIRENT64, 'struct dirent' and
'struct dirent64' have slight different internal layout with d_ino
being a __ino_t on non-LFS version with an extra __pad field which should
be zeroed. */
#include <dirent.h>
#undef _DIRENT_MATCHES_DIRENT64
#define _DIRENT_MATCHES_DIRENT64 0
#define DIRENT_SET_DP_INO(dp, value) \
do { (dp)->d_ino = (value); (dp)->__pad = 0; } while (0)
#include <sysdeps/unix/sysv/linux/getdents.c>

9
sysdeps/unix/sysv/linux/alpha/getdents64.c
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@ -1 +1,10 @@
/* Although Alpha defines _DIRENT_MATCHES_DIRENT64, 'struct dirent' and
'struct dirent64' have slight different internal layout with d_ino
being a __ino_t on non-LFS version with an extra __pad field which should
be zeroed. */
#include <dirent.h>
/* It suppresses the __getdents64 to __getdents alias. */
#undef _DIRENT_MATCHES_DIRENT64
#define _DIRENT_MATCHES_DIRENT64 0
#include <sysdeps/unix/sysv/linux/getdents64.c>

1
sysdeps/unix/sysv/linux/arm/getdents64.c
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@ -1 +0,0 @@
#include <sysdeps/unix/sysv/linux/i386/getdents64.c>

1
sysdeps/unix/sysv/linux/generic/getdents.c
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@ -1 +0,0 @@
/* Defined in getdents64.c */

37
sysdeps/unix/sysv/linux/generic/getdents64.c
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@ -1,37 +0,0 @@
/* Copyright (C) 2011-2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
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 <stddef.h>
#include <stdint.h>
#include <unistd.h>
#include <sys/types.h>
#include <bits/wordsize.h>
#include <sysdep.h>
#include <sys/syscall.h>
/* The kernel struct linux_dirent64 matches the 'struct getdents64' type. */
ssize_t
__getdents64 (int fd, char *buf, size_t nbytes)
{
return INLINE_SYSCALL (getdents64, 3, fd, buf, nbytes);
}
#if __WORDSIZE == 64
strong_alias (__getdents64, __getdents)
#endif

115
sysdeps/unix/sysv/linux/generic/wordsize-32/getdents.c
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@ -1,115 +0,0 @@
/* Copyright (C) 1993-2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Simplified from sysdeps/unix/sysv/linux/getdents.c.
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 <alloca.h>
#include <assert.h>
#include <errno.h>
#include <dirent.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sysdep.h>
#include <sys/syscall.h>
/* Pack the dirent64 struct down into 32-bit offset/inode fields, and
ensure that no overflow occurs. */
ssize_t
__getdents (int fd, char *buf, size_t nbytes)
{
union
{
struct dirent64 k; /* Kernel structure. */
struct dirent u;
char b[1];
} *kbuf = (void *) buf, *outp, *inp;
size_t kbytes = nbytes;
off64_t last_offset = -1;
ssize_t retval;
const size_t size_diff = (offsetof (struct dirent64, d_name)
- offsetof (struct dirent, d_name));
if (nbytes <= sizeof (struct dirent))
{
kbytes = nbytes + offsetof (struct dirent64, d_name)
- offsetof (struct dirent, d_name);
kbuf = __alloca(kbytes);
}
retval = INLINE_SYSCALL (getdents64, 3, fd, kbuf, kbytes);
if (retval == -1)
return -1;
/* These two pointers might alias the same memory buffer.
Standard C requires that we always use the same type for them,
so we must use the union type. */
inp = kbuf;
outp = (void *) buf;
while (&inp->b < &kbuf->b + retval)
{
const size_t alignment = __alignof__ (struct dirent);
/* Since inp->k.d_reclen is already aligned for the kernel
structure this may compute a value that is bigger
than necessary. */
size_t old_reclen = inp->k.d_reclen;
size_t new_reclen = ((old_reclen - size_diff + alignment - 1)
& ~(alignment - 1));
/* Copy the data out of the old structure into temporary space.
Then copy the name, which may overlap if BUF == KBUF. */
const uint64_t d_ino = inp->k.d_ino;
const int64_t d_off = inp->k.d_off;
const uint8_t d_type = inp->k.d_type;
memmove (outp->u.d_name, inp->k.d_name,
old_reclen - offsetof (struct dirent64, d_name));
/* Now we have copied the data from INP and access only OUTP. */
outp->u.d_ino = d_ino;
outp->u.d_off = d_off;
if ((sizeof (outp->u.d_ino) != sizeof (inp->k.d_ino)
&& outp->u.d_ino != d_ino)
|| (sizeof (outp->u.d_off) != sizeof (inp->k.d_off)
&& outp->u.d_off != d_off))
{
/* Overflow. If there was at least one entry before this one,
return them without error, otherwise signal overflow. */
if (last_offset != -1)
{
__lseek64 (fd, last_offset, SEEK_SET);
return outp->b - buf;
}
__set_errno (EOVERFLOW);
return -1;
}
last_offset = d_off;
outp->u.d_reclen = new_reclen;
outp->u.d_type = d_type;
inp = (void *) inp + old_reclen;
outp = (void *) outp + new_reclen;
}
return outp->b - buf;
}

216
sysdeps/unix/sysv/linux/getdents.c
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@ -1,4 +1,5 @@
/* Copyright (C) 1993-2018 Free Software Foundation, Inc.
/* Get directory entries. Linux non-LFS version.
Copyright (C) 1993-2018 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
@ -12,147 +13,48 @@
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
License along with the GNU C Library. If not, see
<http://www.gnu.org/licenses/>. */
#include <alloca.h>
#include <assert.h>
#include <errno.h>
#include <dirent.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#if !_DIRENT_MATCHES_DIRENT64
# include <unistd.h>
#include <sys/param.h>
#include <sys/types.h>
# include <string.h>
# include <errno.h>
#include <sysdep.h>
#include <sys/syscall.h>
#include <linux/posix_types.h>
#include <kernel-features.h>
/* For Linux we need a special version of this file since the
definition of `struct dirent' is not the same for the kernel and
the libc. There is one additional field which might be introduced
in the kernel structure in the future.
Here is the kernel definition of `struct dirent' as of 2.1.20: */
struct kernel_dirent
{
long int d_ino;
__kernel_off_t d_off;
unsigned short int d_reclen;
char d_name[256];
};
struct kernel_dirent64
{
uint64_t d_ino;
int64_t d_off;
unsigned short int d_reclen;
unsigned char d_type;
char d_name[256];
};
#ifndef __GETDENTS
# define __GETDENTS __getdents
#endif
#ifndef DIRENT_TYPE
# define DIRENT_TYPE struct dirent
#endif
# ifndef DIRENT_SET_DP_INO
# define DIRENT_SET_DP_INO(dp, value) (dp)->d_ino = (value)
# endif
/* The problem here is that we cannot simply read the next NBYTES
bytes. We need to take the additional field into account. We use
some heuristic. Assuming the directory contains names with 14
characters on average we can compute an estimated number of entries
which fit in the buffer. Taking this number allows us to specify a
reasonable number of bytes to read. If we should be wrong, we can
reset the file descriptor. In practice the kernel is limiting the
amount of data returned much more then the reduced buffer size. */
/* Pack the dirent64 struct down into 32-bit offset/inode fields, and
ensure that no overflow occurs. */
ssize_t
__GETDENTS (int fd, char *buf, size_t nbytes)
{
ssize_t retval;
/* The d_ino and d_off fields in kernel_dirent and dirent must have
the same sizes and alignments. */
if (sizeof (DIRENT_TYPE) == sizeof (struct dirent)
&& (sizeof (((struct kernel_dirent *) 0)->d_ino)
== sizeof (((struct dirent *) 0)->d_ino))
&& (sizeof (((struct kernel_dirent *) 0)->d_off)
== sizeof (((struct dirent *) 0)->d_off))
&& (offsetof (struct kernel_dirent, d_off)
== offsetof (struct dirent, d_off))
&& (offsetof (struct kernel_dirent, d_reclen)
== offsetof (struct dirent, d_reclen)))
{
retval = INLINE_SYSCALL (getdents, 3, fd, buf, nbytes);
/* The kernel added the d_type value after the name. Change
this now. */
if (retval != -1)
__getdents (int fd, char *buf, size_t nbytes)
{
union
{
struct kernel_dirent k;
/* For !_DIRENT_MATCHES_DIRENT64 kernel 'linux_dirent64' has the same
layout of 'struct dirent64'. */
struct dirent64 k;
struct dirent u;
} *kbuf = (void *) buf;
while ((char *) kbuf < buf + retval)
{
char d_type = *((char *) kbuf + kbuf->k.d_reclen - 1);
memmove (kbuf->u.d_name, kbuf->k.d_name,
strlen (kbuf->k.d_name) + 1);
kbuf->u.d_type = d_type;
kbuf = (void *) ((char *) kbuf + kbuf->k.d_reclen);
}
}
return retval;
}
off64_t last_offset = -1;
#ifdef __NR_getdents64
{
union
{
struct kernel_dirent64 k;
DIRENT_TYPE u;
char b[1];
} *kbuf = (void *) buf, *outp, *inp;
size_t kbytes = nbytes;
if (offsetof (DIRENT_TYPE, d_name)
< offsetof (struct kernel_dirent64, d_name)
&& nbytes <= sizeof (DIRENT_TYPE))
{
kbytes = (nbytes + offsetof (struct kernel_dirent64, d_name)
- offsetof (DIRENT_TYPE, d_name));
kbuf = __alloca(kbytes);
}
retval = INLINE_SYSCALL (getdents64, 3, fd, kbuf, kbytes);
const size_t size_diff = (offsetof (struct kernel_dirent64, d_name)
- offsetof (DIRENT_TYPE, d_name));
off64_t last_offset = -1;
ssize_t retval;
/* Return the error if encountered. */
# define size_diff (offsetof (struct dirent64, d_name) \
- offsetof (struct dirent, d_name))
char kbuftmp[sizeof (struct dirent) + size_diff];
if (nbytes <= sizeof (struct dirent))
kbuf = (void*) kbuftmp;
retval = INLINE_SYSCALL_CALL (getdents64, fd, kbuf, kbytes);
if (retval == -1)
return -1;
/* If the structure returned by the kernel is identical to what we
need, don't do any conversions. */
if (offsetof (DIRENT_TYPE, d_name)
== offsetof (struct kernel_dirent64, d_name)
&& sizeof (outp->u.d_ino) == sizeof (inp->k.d_ino)
&& sizeof (outp->u.d_off) == sizeof (inp->k.d_off))
return retval;
/* These two pointers might alias the same memory buffer.
Standard C requires that we always use the same type for them,
so we must use the union type. */
@ -161,7 +63,7 @@ __GETDENTS (int fd, char *buf, size_t nbytes)
while (&inp->b < &kbuf->b + retval)
{
const size_t alignment = __alignof__ (DIRENT_TYPE);
const size_t alignment = _Alignof (struct dirent);
/* Since inp->k.d_reclen is already aligned for the kernel
structure this may compute a value that is bigger
than necessary. */
@ -176,7 +78,7 @@ __GETDENTS (int fd, char *buf, size_t nbytes)
const uint8_t d_type = inp->k.d_type;
memmove (outp->u.d_name, inp->k.d_name,
old_reclen - offsetof (struct kernel_dirent64, d_name));
old_reclen - offsetof (struct dirent64, d_name));
/* Now we have copied the data from INP and access only OUTP. */
@ -187,16 +89,14 @@ __GETDENTS (int fd, char *buf, size_t nbytes)
|| (sizeof (outp->u.d_off) != sizeof (inp->k.d_off)
&& outp->u.d_off != d_off))
{
/* Overflow. If there was at least one entry
before this one, return them without error,
otherwise signal overflow. */
/* Overflow. If there was at least one entry before this one,
return them without error, otherwise signal overflow. */
if (last_offset != -1)
{
__lseek64 (fd, last_offset, SEEK_SET);
return outp->b - buf;
}
__set_errno (EOVERFLOW);
return -1;
return INLINE_SYSCALL_ERROR_RETURN_VALUE (EOVERFLOW);
}
last_offset = d_off;
@ -209,63 +109,7 @@ __GETDENTS (int fd, char *buf, size_t nbytes)
return outp->b - buf;
}
#endif
{
size_t red_nbytes;
struct kernel_dirent *skdp, *kdp;
const size_t size_diff = (offsetof (DIRENT_TYPE, d_name)
- offsetof (struct kernel_dirent, d_name));
red_nbytes = MIN (nbytes
- ((nbytes / (offsetof (DIRENT_TYPE, d_name) + 14))
* size_diff),
nbytes - size_diff);
# undef DIRENT_SET_DP_INO
skdp = kdp = __alloca (red_nbytes);
retval = INLINE_SYSCALL (getdents, 3, fd, (char *) kdp, red_nbytes);
if (retval == -1)
return -1;
DIRENT_TYPE *dp = (DIRENT_TYPE *) buf;
while ((char *) kdp < (char *) skdp + retval)
{
const size_t alignment = __alignof__ (DIRENT_TYPE);
/* Since kdp->d_reclen is already aligned for the kernel structure
this may compute a value that is bigger than necessary. */
size_t new_reclen = ((kdp->d_reclen + size_diff + alignment - 1)
& ~(alignment - 1));
if ((char *) dp + new_reclen > buf + nbytes)
{
/* Our heuristic failed. We read too many entries. Reset
the stream. */
assert (last_offset != -1);
__lseek64 (fd, last_offset, SEEK_SET);
if ((char *) dp == buf)
{
/* The buffer the user passed in is too small to hold even
one entry. */
__set_errno (EINVAL);
return -1;
}
break;
}
last_offset = kdp->d_off;
DIRENT_SET_DP_INO(dp, kdp->d_ino);
dp->d_off = kdp->d_off;
dp->d_reclen = new_reclen;
dp->d_type = *((char *) kdp + kdp->d_reclen - 1);
memcpy (dp->d_name, kdp->d_name,
kdp->d_reclen - offsetof (struct kernel_dirent, d_name));
dp = (DIRENT_TYPE *) ((char *) dp + new_reclen);
kdp = (struct kernel_dirent *) (((char *) kdp) + kdp->d_reclen);
}
return (char *) dp - buf;
}
}
#endif /* _DIRENT_MATCHES_DIRENT64 */

79
sysdeps/unix/sysv/linux/getdents64.c
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@ -1,3 +1,76 @@
#define __GETDENTS __getdents64
#define DIRENT_TYPE struct dirent64
#include <sysdeps/unix/sysv/linux/getdents.c>
/* Get directory entries. Linux LFS version.
Copyright (C) 1997-2018 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 <string.h>
#include <dirent.h>
#include <errno.h>
/* The kernel struct linux_dirent64 matches the 'struct getdents64' type. */
ssize_t
__getdents64 (int fd, char *buf, size_t nbytes)
{
return INLINE_SYSCALL_CALL (getdents64, fd, buf, nbytes);
}
#if _DIRENT_MATCHES_DIRENT64
strong_alias (__getdents64, __getdents)
#else
# include <shlib-compat.h>
# if SHLIB_COMPAT(libc, GLIBC_2_1, GLIBC_2_2)
# include <olddirent.h>
/* kernel definition of as of 3.2. */
struct compat_linux_dirent
{
/* Both d_ino and d_off are compat_ulong_t which are defined in all
architectures as 'u32'. */
uint32_t d_ino;
uint32_t d_off;
unsigned short d_reclen;
char d_name[1];
};
ssize_t
__old_getdents64 (int fd, char *buf, size_t nbytes)
{
ssize_t retval = INLINE_SYSCALL_CALL (getdents, fd, buf, nbytes);
/* The kernel added the d_type value after the name. Change this now. */
if (retval != -1)
{
union
{
struct compat_linux_dirent k;
struct dirent u;
} *kbuf = (void *) buf;
while ((char *) kbuf < buf + retval)
{
char d_type = *((char *) kbuf + kbuf->k.d_reclen - 1);
memmove (kbuf->u.d_name, kbuf->k.d_name,
strlen (kbuf->k.d_name) + 1);
kbuf->u.d_type = d_type;
kbuf = (void *) ((char *) kbuf + kbuf->k.d_reclen);
}
}
return retval;
}
# endif /* SHLIB_COMPAT(libc, GLIBC_2_1, GLIBC_2_2) */
#endif /* _DIRENT_MATCHES_DIRENT64 */

1
sysdeps/unix/sysv/linux/hppa/getdents64.c
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@ -1 +0,0 @@
#include <sysdeps/unix/sysv/linux/i386/getdents64.c>

39
sysdeps/unix/sysv/linux/i386/getdents64.c
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@ -1,39 +0,0 @@
/* Copyright (C) 2000-2018 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/>. */
#define __GETDENTS __getdents64
#define DIRENT_TYPE struct dirent64
#include <sysdeps/unix/sysv/linux/getdents.c>
#include <shlib-compat.h>
#undef __READDIR
#undef __GETDENTS
#undef DIRENT_TYPE
#if SHLIB_COMPAT(libc, GLIBC_2_1, GLIBC_2_2)
#include <olddirent.h>
#define __GETDENTS __old_getdents64
#define DIRENT_TYPE struct __old_dirent64
#define kernel_dirent old_kernel_dirent
#define kernel_dirent64 old_kernel_dirent64
#include <sysdeps/unix/sysv/linux/getdents.c>
#endif

1
sysdeps/unix/sysv/linux/m68k/getdents64.c
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@ -1 +0,0 @@
#include <sysdeps/unix/sysv/linux/i386/getdents64.c>

110
sysdeps/unix/sysv/linux/mips/mips64/getdents64.c Normal file
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@ -0,0 +1,110 @@
/* Get directory entries. Linux/MIPSn64 LFS version.
Copyright (C) 2018 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 <string.h>
#include <dirent.h>
#include <errno.h>
#include <assert.h>
#include <sys/param.h>
#include <unistd.h>
#include <scratch_buffer.h>
ssize_t
__getdents64 (int fd, char *buf, size_t nbytes)
{
#ifdef __NR_getdents64
ssize_t ret = INLINE_SYSCALL_CALL (getdents64, fd, buf, nbytes);
if (ret != -1)
return ret;
#endif
/* Unfortunately getdents64 was only wire-up for MIPS n64 on Linux 3.10.
If syscall is not available it need to fallback to non-LFS one. */
struct kernel_dirent
{
unsigned long d_ino;
unsigned long d_off;
unsigned short int d_reclen;
char d_name[256];
};
const size_t size_diff = (offsetof (struct dirent64, d_name)
- offsetof (struct kernel_dirent, d_name));
size_t red_nbytes = MIN (nbytes
- ((nbytes / (offsetof (struct dirent64, d_name)
+ 14)) * size_diff),
nbytes - size_diff);
struct scratch_buffer tmpbuf;
scratch_buffer_init (&tmpbuf);
if (!scratch_buffer_set_array_size (&tmpbuf, red_nbytes, sizeof (uint8_t)))
INLINE_SYSCALL_ERROR_RETURN_VALUE (ENOMEM);
struct kernel_dirent *skdp, *kdp;
skdp = kdp = tmpbuf.data;
ssize_t retval = INLINE_SYSCALL_CALL (getdents, fd, kdp, red_nbytes);
if (retval == -1)
{
scratch_buffer_free (&tmpbuf);
return -1;
}
off64_t last_offset = -1;
struct dirent64 *dp = (struct dirent64 *) buf;
while ((char *) kdp < (char *) skdp + retval)
{
const size_t alignment = _Alignof (struct dirent64);
/* Since kdp->d_reclen is already aligned for the kernel structure
this may compute a value that is bigger than necessary. */
size_t new_reclen = ((kdp->d_reclen + size_diff + alignment - 1)
& ~(alignment - 1));
if ((char *) dp + new_reclen > buf + nbytes)
{
/* Our heuristic failed. We read too many entries. Reset
the stream. */
assert (last_offset != -1);
__lseek64 (fd, last_offset, SEEK_SET);
if ((char *) dp == buf)
{
scratch_buffer_free (&tmpbuf);
return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
}
break;
}
last_offset = kdp->d_off;
dp->d_ino = kdp->d_ino;
dp->d_off = kdp->d_off;
dp->d_reclen = new_reclen;
dp->d_type = *((char *) kdp + kdp->d_reclen - 1);
memcpy (dp->d_name, kdp->d_name,
kdp->d_reclen - offsetof (struct kernel_dirent, d_name));
dp = (struct dirent64 *) ((char *) dp + new_reclen);
kdp = (struct kernel_dirent *) (((char *) kdp) + kdp->d_reclen);
}
scratch_buffer_free (&tmpbuf);
return (char *) dp - buf;
}
strong_alias (__getdents64, __getdents)

1
sysdeps/unix/sysv/linux/powerpc/getdents64.c
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@ -1 +0,0 @@
#include <sysdeps/unix/sysv/linux/i386/getdents64.c>

1
sysdeps/unix/sysv/linux/s390/s390-32/getdents64.c
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@ -1 +0,0 @@
#include <sysdeps/unix/sysv/linux/i386/getdents64.c>

1
sysdeps/unix/sysv/linux/sparc/sparc32/getdents64.c
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@ -1 +0,0 @@
#include <sysdeps/unix/sysv/linux/i386/getdents64.c>

8
sysdeps/unix/sysv/linux/sparc/sparc64/get_clockfreq.c
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@ -90,12 +90,12 @@ __get_clockfreq_via_proc_openprom (void)
if (obp_fd != -1)
{
unsigned long int buf[4096 / sizeof (unsigned long int)];
struct dirent *dirp = (struct dirent *) buf;
struct dirent64 *dirp = (struct dirent64 *) buf;
ssize_t len;
while ((len = __getdents (obp_fd, (char *) dirp, sizeof (buf))) > 0)
while ((len = __getdents64 (obp_fd, (char *) dirp, sizeof (buf))) > 0)
{
struct dirent *this_dirp = dirp;
struct dirent64 *this_dirp = dirp;
while (len > 0)
{
@ -140,7 +140,7 @@ __get_clockfreq_via_proc_openprom (void)
break;
len -= this_dirp->d_reclen;
this_dirp = (struct dirent *)
this_dirp = (struct dirent64 *)
((char *) this_dirp + this_dirp->d_reclen);
}
if (result != 0)

4
sysdeps/unix/sysv/linux/wordsize-64/getdents.c
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@ -1,4 +0,0 @@
#define __getdents64 __no___getdents64_decl
#include <sysdeps/unix/sysv/linux/getdents.c>
#undef __getdents64
weak_alias (__getdents, __getdents64);

1
sysdeps/unix/sysv/linux/wordsize-64/getdents64.c
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@ -1 +0,0 @@
/* getdents64 is in getdents.c */