[v2] posix: Fix attribute access mode on getcwd [BZ #27476]

There is a GNU extension that allows to call getcwd(NULL, >0). It is
described in the documentation, but also directly in the unistd.h
header, just above the declaration.

Therefore the attribute access mode added in commit 06febd8c6705
is not correct. Drop it.
---
 posix/bits/unistd.h | 5 ++---
 posix/unistd.h      | 3 +--
 2 files changed, 3 insertions(+), 5 deletions(-)

Note: I am aware of BZ #26545, however while it is being discussed, the
bug is still there, so I don't think we should block on a decision to
fix it.

Any opinion about that patch? Florian maybe given you have reviewed v1?

Thanks
Aurelien

On 2021-09-10 20:38, Aurelien Jarno wrote:
> There is a GNU extension that allows to call getcwd(NULL, >0). It is
> described in the documentation, but also directly in the unistd.h
> header, just above the declaration.
> 
> Therefore the attribute access mode added in commit 06febd8c6705
> is not correct. Drop it.
> ---
>  posix/bits/unistd.h | 5 ++---
>  posix/unistd.h      | 3 +--
>  2 files changed, 3 insertions(+), 5 deletions(-)
> 
> Note: I am aware of BZ #26545, however while it is being discussed, the
> bug is still there, so I don't think we should block on a decision to
> fix it.
> 
> diff --git a/posix/bits/unistd.h b/posix/bits/unistd.h
> index f0831386c7..622adeb2b2 100644
> --- a/posix/bits/unistd.h
> +++ b/posix/bits/unistd.h
> @@ -199,10 +199,9 @@ __NTH (readlinkat (int __fd, const char *__restrict __path,
>  #endif
>  
>  extern char *__getcwd_chk (char *__buf, size_t __size, size_t __buflen)
> -     __THROW __wur __attr_access ((__write_only__, 1, 2));
> +     __THROW __wur;
>  extern char *__REDIRECT_NTH (__getcwd_alias,
> -			     (char *__buf, size_t __size), getcwd)
> -  __wur __attr_access ((__write_only__, 1, 2));
> +			     (char *__buf, size_t __size), getcwd) __wur;
>  extern char *__REDIRECT_NTH (__getcwd_chk_warn,
>  			     (char *__buf, size_t __size, size_t __buflen),
>  			     __getcwd_chk)
> diff --git a/posix/unistd.h b/posix/unistd.h
> index 3dca65732f..8224c5fbc9 100644
> --- a/posix/unistd.h
> +++ b/posix/unistd.h
> @@ -528,8 +528,7 @@ extern int fchdir (int __fd) __THROW __wur;
>     an array is allocated with `malloc'; the array is SIZE
>     bytes long, unless SIZE == 0, in which case it is as
>     big as necessary.  */
> -extern char *getcwd (char *__buf, size_t __size) __THROW __wur
> -    __attr_access ((__write_only__, 1, 2));
> +extern char *getcwd (char *__buf, size_t __size) __THROW __wur;
>  
>  #ifdef	__USE_GNU
>  /* Return a malloc'd string containing the current directory name.
> -- 
> 2.30.2
> 
>

* Aurelien Jarno:

> There is a GNU extension that allows to call getcwd(NULL, >0). It is
> described in the documentation, but also directly in the unistd.h
> header, just above the declaration.
>
> Therefore the attribute access mode added in commit 06febd8c6705
> is not correct. Drop it.
> ---
>  posix/bits/unistd.h | 5 ++---
>  posix/unistd.h      | 3 +--
>  2 files changed, 3 insertions(+), 5 deletions(-)
>
> Note: I am aware of BZ #26545, however while it is being discussed, the
> bug is still there, so I don't think we should block on a decision to
> fix it.
>
> diff --git a/posix/bits/unistd.h b/posix/bits/unistd.h
> index f0831386c7..622adeb2b2 100644
> --- a/posix/bits/unistd.h
> +++ b/posix/bits/unistd.h
> @@ -199,10 +199,9 @@ __NTH (readlinkat (int __fd, const char *__restrict __path,
>  #endif
>  
>  extern char *__getcwd_chk (char *__buf, size_t __size, size_t __buflen)
> -     __THROW __wur __attr_access ((__write_only__, 1, 2));
> +     __THROW __wur;
>  extern char *__REDIRECT_NTH (__getcwd_alias,
> -			     (char *__buf, size_t __size), getcwd)
> -  __wur __attr_access ((__write_only__, 1, 2));
> +			     (char *__buf, size_t __size), getcwd) __wur;
>  extern char *__REDIRECT_NTH (__getcwd_chk_warn,
>  			     (char *__buf, size_t __size, size_t __buflen),
>  			     __getcwd_chk)
> diff --git a/posix/unistd.h b/posix/unistd.h
> index 3dca65732f..8224c5fbc9 100644
> --- a/posix/unistd.h
> +++ b/posix/unistd.h
> @@ -528,8 +528,7 @@ extern int fchdir (int __fd) __THROW __wur;
>     an array is allocated with `malloc'; the array is SIZE
>     bytes long, unless SIZE == 0, in which case it is as
>     big as necessary.  */
> -extern char *getcwd (char *__buf, size_t __size) __THROW __wur
> -    __attr_access ((__write_only__, 1, 2));
> +extern char *getcwd (char *__buf, size_t __size) __THROW __wur;
>  
>  #ifdef	__USE_GNU
>  /* Return a malloc'd string containing the current directory name.

This looks okay to me, thanks.

Reviewed-by: Florian Weimer <fweimer@redhat.com>

Florian