[16/16] linux: Move xmknoda{at} to compat symbols

Message ID 20200723194641.1949404-17-adhemerval.zanella@linaro.org
State New
Headers show
Series
  • Add y2038 support for stat functions
Related show

Commit Message

It also decouple mknod{at} from xmknod{at}.

Checked with a build for all affected Linux ABIs.  I checked also
on x86_64-linux-gnu and i686-linux-gnu.
---
 include/sys/stat.h                 |  6 +++--
 sysdeps/mach/hurd/xmknod.c         |  1 -
 sysdeps/mach/hurd/xmknodat.c       |  2 --
 sysdeps/unix/sysv/linux/mknod.c    | 28 ++++++++++++++++++++
 sysdeps/unix/sysv/linux/mknodat.c  | 41 ++++++++++++++++++++++++++++++
 sysdeps/unix/sysv/linux/xmknod.c   | 20 +++++----------
 sysdeps/unix/sysv/linux/xmknodat.c | 23 +++++------------
 7 files changed, 86 insertions(+), 35 deletions(-)
 create mode 100644 sysdeps/unix/sysv/linux/mknod.c
 create mode 100644 sysdeps/unix/sysv/linux/mknodat.c

-- 
2.25.1

Comments

Michael Kerrisk \(man-pages\) via Libc-alpha July 24, 2020, 10:30 a.m. | #1
* Adhemerval Zanella via Libc-alpha:

> diff --git a/sysdeps/unix/sysv/linux/mknodat.c b/sysdeps/unix/sysv/linux/mknodat.c

> new file mode 100644

> index 0000000000..d160fe520b

> --- /dev/null

> +++ b/sysdeps/unix/sysv/linux/mknodat.c

> @@ -0,0 +1,41 @@


> +int

> +__mknodat_common (int fd, const char *path, mode_t mode, dev_t *dev)

> +{

> +  /* We must convert the value to dev_t type used by the kernel.  */

> +  unsigned long long int k_dev = (*dev) & ((1ULL << 32) - 1);

> +  if (k_dev != *dev)

> +    return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);

> +

> +  return INLINE_SYSCALL_CALL (mknodat, fd, path, mode,

> +			      (unsigned int) k_dev);

> +}


This looks suspicious yo me.  Why use a dev_t * argument?  Why check
against the unsigned long long int value, when the kernel receives an
unsigned int value in the system call?

What's the intended difference between __mknodat_common and __mknodat?

Thanks,
Florian
Lukasz Majewski July 24, 2020, 10:43 a.m. | #2
On Thu, 23 Jul 2020 16:46:41 -0300
Adhemerval Zanella <adhemerval.zanella@linaro.org> wrote:

> It also decouple mknod{at} from xmknod{at}.

> 

> Checked with a build for all affected Linux ABIs.  I checked also

> on x86_64-linux-gnu and i686-linux-gnu.


Reviewed-by: Lukasz Majewski <lukma@denx.de>


> ---

>  include/sys/stat.h                 |  6 +++--

>  sysdeps/mach/hurd/xmknod.c         |  1 -

>  sysdeps/mach/hurd/xmknodat.c       |  2 --

>  sysdeps/unix/sysv/linux/mknod.c    | 28 ++++++++++++++++++++

>  sysdeps/unix/sysv/linux/mknodat.c  | 41

> ++++++++++++++++++++++++++++++ sysdeps/unix/sysv/linux/xmknod.c   |

> 20 +++++---------- sysdeps/unix/sysv/linux/xmknodat.c | 23

> +++++------------ 7 files changed, 86 insertions(+), 35 deletions(-)

>  create mode 100644 sysdeps/unix/sysv/linux/mknod.c

>  create mode 100644 sysdeps/unix/sysv/linux/mknodat.c

> 

> diff --git a/include/sys/stat.h b/include/sys/stat.h

> index 87d4a5ec4f..da8b14fee0 100644

> --- a/include/sys/stat.h

> +++ b/include/sys/stat.h

> @@ -84,6 +84,8 @@ extern __mode_t __umask (__mode_t __mask);

>  extern int __mkdir (const char *__path, __mode_t __mode);

>  libc_hidden_proto (__mkdir)

>  

> +extern int __mknodat_common (int fd, const char *, __mode_t, __dev_t

> *)

> +  attribute_hidden;

>  extern int __mknodat (int fd, const char *path, mode_t mode, dev_t

> dev); libc_hidden_proto (__mknodat);

>  extern int __mknod (const char *__path,

> @@ -92,10 +94,8 @@ libc_hidden_proto (__mknod);

>  

>  extern int __xmknod (int __ver, const char *__path, __mode_t __mode,

>  		     __dev_t *__dev);

> -libc_hidden_proto (__xmknod)

>  extern int __xmknodat (int __ver, int __fd, const char *__path,

>  		       __mode_t __mode, __dev_t *__dev);

> -libc_hidden_proto (__xmknodat)

>  

>  int __fxstat (int __ver, int __fildes, struct stat *__stat_buf);

>  int __xstat (int __ver, const char *__filename,

> @@ -121,6 +121,8 @@ hidden_proto (__xstat64);

>  hidden_proto (__lxstat64);

>  hidden_proto (__fxstatat64);

>  #  endif

> +libc_hidden_proto (__xmknod)

> +libc_hidden_proto (__xmknodat)

>  #  define stat(fname, buf) __xstat (_STAT_VER, fname, buf)

>  #  define lstat(fname, buf)  __lxstat (_STAT_VER, fname, buf)

>  #  define __lstat(fname, buf)  __lxstat (_STAT_VER, fname, buf)

> diff --git a/sysdeps/mach/hurd/xmknod.c b/sysdeps/mach/hurd/xmknod.c

> index 0ab4f1b719..67e32f518d 100644

> --- a/sysdeps/mach/hurd/xmknod.c

> +++ b/sysdeps/mach/hurd/xmknod.c

> @@ -30,4 +30,3 @@ __xmknod (int vers, const char *file_name, mode_t

> mode, dev_t *dev) {

>    return __xmknodat (vers, AT_FDCWD, file_name, mode, dev);

>  }

> -libc_hidden_def (__xmknod)

> diff --git a/sysdeps/mach/hurd/xmknodat.c

> b/sysdeps/mach/hurd/xmknodat.c index 4239d1ea91..0333765ebc 100644

> --- a/sysdeps/mach/hurd/xmknodat.c

> +++ b/sysdeps/mach/hurd/xmknodat.c

> @@ -116,5 +116,3 @@ __xmknodat (int vers, int fd, const char *path,

> mode_t mode, dev_t *dev) return __hurd_fail (err);

>    return 0;

>  }

> -

> -libc_hidden_def (__xmknodat)

> diff --git a/sysdeps/unix/sysv/linux/mknod.c

> b/sysdeps/unix/sysv/linux/mknod.c new file mode 100644

> index 0000000000..3185726f52

> --- /dev/null

> +++ b/sysdeps/unix/sysv/linux/mknod.c

> @@ -0,0 +1,28 @@

> +/* Create a special or ordinary file.  Linux version.

> +   Copyright (C) 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 <sys/stat.h>

> +#include <fcntl.h>

> +

> +int

> +__mknod (const char *path, mode_t mode, dev_t dev)

> +{

> +  return __mknodat_common (AT_FDCWD, path, mode, &dev);

> +}

> +libc_hidden_def (__mknod)

> +weak_alias (__mknod, mknod)

> diff --git a/sysdeps/unix/sysv/linux/mknodat.c

> b/sysdeps/unix/sysv/linux/mknodat.c new file mode 100644

> index 0000000000..d160fe520b

> --- /dev/null

> +++ b/sysdeps/unix/sysv/linux/mknodat.c

> @@ -0,0 +1,41 @@

> +/* Create a special or ordinary file.  Linux version.

> +   Copyright (C) 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 <sys/types.h>

> +#include <sys/stat.h>

> +#include <errno.h>

> +

> +int

> +__mknodat_common (int fd, const char *path, mode_t mode, dev_t *dev)

> +{

> +  /* We must convert the value to dev_t type used by the kernel.  */

> +  unsigned long long int k_dev = (*dev) & ((1ULL << 32) - 1);

> +  if (k_dev != *dev)

> +    return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);

> +

> +  return INLINE_SYSCALL_CALL (mknodat, fd, path, mode,

> +			      (unsigned int) k_dev);

> +}

> +

> +int

> +__mknodat (int fd, const char *path, mode_t mode, dev_t dev)

> +{

> +  return __mknodat_common (fd, path, mode, &dev);

> +}

> +libc_hidden_def (__mknodat)

> +weak_alias (__mknodat, mknodat)

> diff --git a/sysdeps/unix/sysv/linux/xmknod.c

> b/sysdeps/unix/sysv/linux/xmknod.c index 42809d4c57..2ae384a536 100644

> --- a/sysdeps/unix/sysv/linux/xmknod.c

> +++ b/sysdeps/unix/sysv/linux/xmknod.c

> @@ -17,29 +17,23 @@

>     <https://www.gnu.org/licenses/>.  */

>  

>  #include <sys/stat.h>

> -#include <sys/sysmacros.h>

>  #include <fcntl.h>

> -#include <sysdep.h>

> +#include <errno.h>

> +#include <shlib-compat.h>

>  

> +#if SHLIB_COMPAT(libc, GLIBC_2_0, GLIBC_2_33)

>  /* Create a device file named PATH, with permission and special bits

> MODE and device number DEV (which can be constructed from major and

> minor device numbers with the `makedev' macro above).  */

>  int

> +attribute_compat_text_section

>  __xmknod (int vers, const char *path, mode_t mode, dev_t *dev)

>  {

> -  unsigned long long int k_dev;

> -

>    if (vers != _MKNOD_VER)

>      return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);

>  

> -  /* We must convert the value to dev_t type used by the kernel.  */

> -  k_dev =  (*dev) & ((1ULL << 32) - 1);

> -  if (k_dev != *dev)

> -    return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);

> -

> -  return INLINE_SYSCALL_CALL (mknodat, AT_FDCWD, path, mode,

> -			      (unsigned int) k_dev);

> +  return __mknodat_common (AT_FDCWD, path, mode, dev);

>  }

>  

> -weak_alias (__xmknod, _xmknod)

> -libc_hidden_def (__xmknod)

> +compat_symbol (libc, __xmknod, __xmknod, GLIBC_2_0);

> +#endif

> diff --git a/sysdeps/unix/sysv/linux/xmknodat.c

> b/sysdeps/unix/sysv/linux/xmknodat.c index 5640a499aa..11b52a29b2

> 100644 --- a/sysdeps/unix/sysv/linux/xmknodat.c

> +++ b/sysdeps/unix/sysv/linux/xmknodat.c

> @@ -15,18 +15,11 @@

>     License along with the GNU C Library; if not, see

>     <https://www.gnu.org/licenses/>.  */

>  

> -#include <errno.h>

> -#include <fcntl.h>

> -#include <stdio.h>

> -#include <string.h>

> -#include <sys/types.h>

>  #include <sys/stat.h>

> -#include <sys/sysmacros.h>

> -

> -#include <sysdep.h>

> -#include <sys/syscall.h>

> -

> +#include <errno.h>

> +#include <shlib-compat.h>

>  

> +#if SHLIB_COMPAT(libc, GLIBC_2_4, GLIBC_2_33)

>  /* Create a device file named PATH relative to FD, with permission

> and special bits MODE and device number DEV (which can be constructed

>     from major and minor device numbers with the `makedev' macro

> above).  */ @@ -36,12 +29,8 @@ __xmknodat (int vers, int fd, const

> char *file, mode_t mode, dev_t *dev) if (vers != _MKNOD_VER)

>      return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);

>  

> -  /* We must convert the value to dev_t type used by the kernel.  */

> -  unsigned long long int k_dev =  (*dev) & ((1ULL << 32) - 1);

> -  if (k_dev != *dev)

> -    return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);

> -

> -  return INLINE_SYSCALL (mknodat, 4, fd, file, mode, (unsigned int)

> k_dev);

> +  return __mknodat_common (fd, file, mode, dev);

>  }

>  

> -libc_hidden_def (__xmknodat)

> +compat_symbol (libc, __xmknodat, __xmknodat, GLIBC_2_4);

> +#endif





Best regards,

Lukasz Majewski

--

DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lukma@denx.de
Michael Kerrisk \(man-pages\) via Libc-alpha July 24, 2020, 12:34 p.m. | #3
On 24/07/2020 07:30, Florian Weimer wrote:
> * Adhemerval Zanella via Libc-alpha:

> 

>> diff --git a/sysdeps/unix/sysv/linux/mknodat.c b/sysdeps/unix/sysv/linux/mknodat.c

>> new file mode 100644

>> index 0000000000..d160fe520b

>> --- /dev/null

>> +++ b/sysdeps/unix/sysv/linux/mknodat.c

>> @@ -0,0 +1,41 @@

> 

>> +int

>> +__mknodat_common (int fd, const char *path, mode_t mode, dev_t *dev)

>> +{

>> +  /* We must convert the value to dev_t type used by the kernel.  */

>> +  unsigned long long int k_dev = (*dev) & ((1ULL << 32) - 1);

>> +  if (k_dev != *dev)

>> +    return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);

>> +

>> +  return INLINE_SYSCALL_CALL (mknodat, fd, path, mode,

>> +			      (unsigned int) k_dev);

>> +}

> 

> This looks suspicious yo me.  Why use a dev_t * argument?  Why check

> against the unsigned long long int value, when the kernel receives an

> unsigned int value in the system call?


Because glibc exports dev_t is 64-bit on all architectures (__DEV_T_TYPE),
while kernel current only accepts 32-bits.  But I used the dev_t *
argument to make it more straightforward to implement xmknod{at}.  I 
can change to use a dev_t as well

> 

> What's the intended difference between __mknodat_common and __mknodat

None, in fact I think it would be better to implement xmknod{at} in terms
of mknod{at}.
Michael Kerrisk \(man-pages\) via Libc-alpha July 24, 2020, 12:43 p.m. | #4
* Adhemerval Zanella:

> On 24/07/2020 07:30, Florian Weimer wrote:

>> * Adhemerval Zanella via Libc-alpha:

>> 

>>> diff --git a/sysdeps/unix/sysv/linux/mknodat.c b/sysdeps/unix/sysv/linux/mknodat.c

>>> new file mode 100644

>>> index 0000000000..d160fe520b

>>> --- /dev/null

>>> +++ b/sysdeps/unix/sysv/linux/mknodat.c

>>> @@ -0,0 +1,41 @@

>> 

>>> +int

>>> +__mknodat_common (int fd, const char *path, mode_t mode, dev_t *dev)

>>> +{

>>> +  /* We must convert the value to dev_t type used by the kernel.  */

>>> +  unsigned long long int k_dev = (*dev) & ((1ULL << 32) - 1);

>>> +  if (k_dev != *dev)

>>> +    return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);

>>> +

>>> +  return INLINE_SYSCALL_CALL (mknodat, fd, path, mode,

>>> +			      (unsigned int) k_dev);

>>> +}

>> 

>> This looks suspicious yo me.  Why use a dev_t * argument?  Why check

>> against the unsigned long long int value, when the kernel receives an

>> unsigned int value in the system call?

>

> Because glibc exports dev_t is 64-bit on all architectures (__DEV_T_TYPE),

> while kernel current only accepts 32-bits.


But then the type of k_dev should be unsigned int, I think.

> But I used the dev_t * argument to make it more straightforward to

> implement xmknod{at}.  I can change to use a dev_t as well


Yes please.

Thanks,
Florian
Michael Kerrisk \(man-pages\) via Libc-alpha July 24, 2020, 12:49 p.m. | #5
On 24/07/2020 09:43, Florian Weimer wrote:
> * Adhemerval Zanella:

> 

>> On 24/07/2020 07:30, Florian Weimer wrote:

>>> * Adhemerval Zanella via Libc-alpha:

>>>

>>>> diff --git a/sysdeps/unix/sysv/linux/mknodat.c b/sysdeps/unix/sysv/linux/mknodat.c

>>>> new file mode 100644

>>>> index 0000000000..d160fe520b

>>>> --- /dev/null

>>>> +++ b/sysdeps/unix/sysv/linux/mknodat.c

>>>> @@ -0,0 +1,41 @@

>>>

>>>> +int

>>>> +__mknodat_common (int fd, const char *path, mode_t mode, dev_t *dev)

>>>> +{

>>>> +  /* We must convert the value to dev_t type used by the kernel.  */

>>>> +  unsigned long long int k_dev = (*dev) & ((1ULL << 32) - 1);

>>>> +  if (k_dev != *dev)

>>>> +    return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);

>>>> +

>>>> +  return INLINE_SYSCALL_CALL (mknodat, fd, path, mode,

>>>> +			      (unsigned int) k_dev);

>>>> +}

>>>

>>> This looks suspicious yo me.  Why use a dev_t * argument?  Why check

>>> against the unsigned long long int value, when the kernel receives an

>>> unsigned int value in the system call?

>>

>> Because glibc exports dev_t is 64-bit on all architectures (__DEV_T_TYPE),

>> while kernel current only accepts 32-bits.

> 

> But then the type of k_dev should be unsigned int, I think.


Indeed, the code at least does it on the INLINE_SYSCALL_CALL. I copied the 
code as is from current linux xmknodat, but I agree with you that it is
not the most clear one.

> 

>> But I used the dev_t * argument to make it more straightforward to

>> implement xmknod{at}.  I can change to use a dev_t as well

> 

> Yes please.


Ack.

Patch

diff --git a/include/sys/stat.h b/include/sys/stat.h
index 87d4a5ec4f..da8b14fee0 100644
--- a/include/sys/stat.h
+++ b/include/sys/stat.h
@@ -84,6 +84,8 @@  extern __mode_t __umask (__mode_t __mask);
 extern int __mkdir (const char *__path, __mode_t __mode);
 libc_hidden_proto (__mkdir)
 
+extern int __mknodat_common (int fd, const char *, __mode_t, __dev_t *)
+  attribute_hidden;
 extern int __mknodat (int fd, const char *path, mode_t mode, dev_t dev);
 libc_hidden_proto (__mknodat);
 extern int __mknod (const char *__path,
@@ -92,10 +94,8 @@  libc_hidden_proto (__mknod);
 
 extern int __xmknod (int __ver, const char *__path, __mode_t __mode,
 		     __dev_t *__dev);
-libc_hidden_proto (__xmknod)
 extern int __xmknodat (int __ver, int __fd, const char *__path,
 		       __mode_t __mode, __dev_t *__dev);
-libc_hidden_proto (__xmknodat)
 
 int __fxstat (int __ver, int __fildes, struct stat *__stat_buf);
 int __xstat (int __ver, const char *__filename,
@@ -121,6 +121,8 @@  hidden_proto (__xstat64);
 hidden_proto (__lxstat64);
 hidden_proto (__fxstatat64);
 #  endif
+libc_hidden_proto (__xmknod)
+libc_hidden_proto (__xmknodat)
 #  define stat(fname, buf) __xstat (_STAT_VER, fname, buf)
 #  define lstat(fname, buf)  __lxstat (_STAT_VER, fname, buf)
 #  define __lstat(fname, buf)  __lxstat (_STAT_VER, fname, buf)
diff --git a/sysdeps/mach/hurd/xmknod.c b/sysdeps/mach/hurd/xmknod.c
index 0ab4f1b719..67e32f518d 100644
--- a/sysdeps/mach/hurd/xmknod.c
+++ b/sysdeps/mach/hurd/xmknod.c
@@ -30,4 +30,3 @@  __xmknod (int vers, const char *file_name, mode_t mode, dev_t *dev)
 {
   return __xmknodat (vers, AT_FDCWD, file_name, mode, dev);
 }
-libc_hidden_def (__xmknod)
diff --git a/sysdeps/mach/hurd/xmknodat.c b/sysdeps/mach/hurd/xmknodat.c
index 4239d1ea91..0333765ebc 100644
--- a/sysdeps/mach/hurd/xmknodat.c
+++ b/sysdeps/mach/hurd/xmknodat.c
@@ -116,5 +116,3 @@  __xmknodat (int vers, int fd, const char *path, mode_t mode, dev_t *dev)
     return __hurd_fail (err);
   return 0;
 }
-
-libc_hidden_def (__xmknodat)
diff --git a/sysdeps/unix/sysv/linux/mknod.c b/sysdeps/unix/sysv/linux/mknod.c
new file mode 100644
index 0000000000..3185726f52
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/mknod.c
@@ -0,0 +1,28 @@ 
+/* Create a special or ordinary file.  Linux version.
+   Copyright (C) 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 <sys/stat.h>
+#include <fcntl.h>
+
+int
+__mknod (const char *path, mode_t mode, dev_t dev)
+{
+  return __mknodat_common (AT_FDCWD, path, mode, &dev);
+}
+libc_hidden_def (__mknod)
+weak_alias (__mknod, mknod)
diff --git a/sysdeps/unix/sysv/linux/mknodat.c b/sysdeps/unix/sysv/linux/mknodat.c
new file mode 100644
index 0000000000..d160fe520b
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/mknodat.c
@@ -0,0 +1,41 @@ 
+/* Create a special or ordinary file.  Linux version.
+   Copyright (C) 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 <sys/types.h>
+#include <sys/stat.h>
+#include <errno.h>
+
+int
+__mknodat_common (int fd, const char *path, mode_t mode, dev_t *dev)
+{
+  /* We must convert the value to dev_t type used by the kernel.  */
+  unsigned long long int k_dev = (*dev) & ((1ULL << 32) - 1);
+  if (k_dev != *dev)
+    return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
+
+  return INLINE_SYSCALL_CALL (mknodat, fd, path, mode,
+			      (unsigned int) k_dev);
+}
+
+int
+__mknodat (int fd, const char *path, mode_t mode, dev_t dev)
+{
+  return __mknodat_common (fd, path, mode, &dev);
+}
+libc_hidden_def (__mknodat)
+weak_alias (__mknodat, mknodat)
diff --git a/sysdeps/unix/sysv/linux/xmknod.c b/sysdeps/unix/sysv/linux/xmknod.c
index 42809d4c57..2ae384a536 100644
--- a/sysdeps/unix/sysv/linux/xmknod.c
+++ b/sysdeps/unix/sysv/linux/xmknod.c
@@ -17,29 +17,23 @@ 
    <https://www.gnu.org/licenses/>.  */
 
 #include <sys/stat.h>
-#include <sys/sysmacros.h>
 #include <fcntl.h>
-#include <sysdep.h>
+#include <errno.h>
+#include <shlib-compat.h>
 
+#if SHLIB_COMPAT(libc, GLIBC_2_0, GLIBC_2_33)
 /* Create a device file named PATH, with permission and special bits MODE
    and device number DEV (which can be constructed from major and minor
    device numbers with the `makedev' macro above).  */
 int
+attribute_compat_text_section
 __xmknod (int vers, const char *path, mode_t mode, dev_t *dev)
 {
-  unsigned long long int k_dev;
-
   if (vers != _MKNOD_VER)
     return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
 
-  /* We must convert the value to dev_t type used by the kernel.  */
-  k_dev =  (*dev) & ((1ULL << 32) - 1);
-  if (k_dev != *dev)
-    return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
-
-  return INLINE_SYSCALL_CALL (mknodat, AT_FDCWD, path, mode,
-			      (unsigned int) k_dev);
+  return __mknodat_common (AT_FDCWD, path, mode, dev);
 }
 
-weak_alias (__xmknod, _xmknod)
-libc_hidden_def (__xmknod)
+compat_symbol (libc, __xmknod, __xmknod, GLIBC_2_0);
+#endif
diff --git a/sysdeps/unix/sysv/linux/xmknodat.c b/sysdeps/unix/sysv/linux/xmknodat.c
index 5640a499aa..11b52a29b2 100644
--- a/sysdeps/unix/sysv/linux/xmknodat.c
+++ b/sysdeps/unix/sysv/linux/xmknodat.c
@@ -15,18 +15,11 @@ 
    License along with the GNU C Library; if not, see
    <https://www.gnu.org/licenses/>.  */
 
-#include <errno.h>
-#include <fcntl.h>
-#include <stdio.h>
-#include <string.h>
-#include <sys/types.h>
 #include <sys/stat.h>
-#include <sys/sysmacros.h>
-
-#include <sysdep.h>
-#include <sys/syscall.h>
-
+#include <errno.h>
+#include <shlib-compat.h>
 
+#if SHLIB_COMPAT(libc, GLIBC_2_4, GLIBC_2_33)
 /* Create a device file named PATH relative to FD, with permission and
    special bits MODE and device number DEV (which can be constructed
    from major and minor device numbers with the `makedev' macro above).  */
@@ -36,12 +29,8 @@  __xmknodat (int vers, int fd, const char *file, mode_t mode, dev_t *dev)
   if (vers != _MKNOD_VER)
     return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
 
-  /* We must convert the value to dev_t type used by the kernel.  */
-  unsigned long long int k_dev =  (*dev) & ((1ULL << 32) - 1);
-  if (k_dev != *dev)
-    return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
-
-  return INLINE_SYSCALL (mknodat, 4, fd, file, mode, (unsigned int) k_dev);
+  return __mknodat_common (fd, file, mode, dev);
 }
 
-libc_hidden_def (__xmknodat)
+compat_symbol (libc, __xmknodat, __xmknodat, GLIBC_2_4);
+#endif