linux-user: Fix sys_utimensat (would not compile on old glibc)

Commit c0d472b12e accidentally dropped the definition of
__NR_SYS_utimensat even though its use is guarded by
CONFIG_UTIMENSAT, not CONFIG_ATFILE. Some older glibc don't
have utimensat() (even if they have the other *at() functions).
Fix this by correctly cleaning up the sys_utimensat()
implementation and #defines, so that we always provide the
syscall if needed whether we're doing it via glibc or not.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 linux-user/syscall.c |   16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

On Thu, Jun 20, 2013 at 5:57 PM, Peter Maydell <peter.maydell@linaro.org> wrote:
> Commit c0d472b12e accidentally dropped the definition of
> __NR_SYS_utimensat even though its use is guarded by
> CONFIG_UTIMENSAT, not CONFIG_ATFILE. Some older glibc don't
> have utimensat() (even if they have the other *at() functions).
> Fix this by correctly cleaning up the sys_utimensat()
> implementation and #defines, so that we always provide the
> syscall if needed whether we're doing it via glibc or not.
>
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

Tested-by: Laurent Desnogues <laurent.desnogues@gmail.com>


Laurent

> ---
>  linux-user/syscall.c |   16 ++++++++++++----
>  1 file changed, 12 insertions(+), 4 deletions(-)
>
> diff --git a/linux-user/syscall.c b/linux-user/syscall.c
> index cdd0c28..f7877c3 100644
> --- a/linux-user/syscall.c
> +++ b/linux-user/syscall.c
> @@ -338,6 +338,7 @@ static int sys_openat(int dirfd, const char *pathname, int flags, mode_t mode)
>  }
>  #endif
>
> +#ifdef TARGET_NR_utimensat
>  #ifdef CONFIG_UTIMENSAT
>  static int sys_utimensat(int dirfd, const char *pathname,
>      const struct timespec times[2], int flags)
> @@ -347,12 +348,19 @@ static int sys_utimensat(int dirfd, const char *pathname,
>      else
>          return utimensat(dirfd, pathname, times, flags);
>  }
> -#else
> -#if defined(TARGET_NR_utimensat) && defined(__NR_utimensat)
> +#elif defined(__NR_utimensat)
> +#define __NR_sys_utimensat __NR_utimensat
>  _syscall4(int,sys_utimensat,int,dirfd,const char *,pathname,
>            const struct timespec *,tsp,int,flags)
> +#else
> +static int sys_utimensat(int dirfd, const char *pathname,
> +                         const struct timespec times[2], int flags)
> +{
> +    errno = ENOSYS;
> +    return -1;
> +}
>  #endif
> -#endif /* CONFIG_UTIMENSAT  */
> +#endif /* TARGET_NR_utimensat */
>
>  #ifdef CONFIG_INOTIFY
>  #include <sys/inotify.h>
> @@ -8536,7 +8544,7 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
>          goto unimplemented_nowarn;
>  #endif
>
> -#if defined(TARGET_NR_utimensat) && defined(__NR_utimensat)
> +#if defined(TARGET_NR_utimensat)
>      case TARGET_NR_utimensat:
>          {
>              struct timespec *tsp, ts[2];
> --
> 1.7.9.5
>
>