nanosleep: Pass NULL when rem == NULL on ports with __TIMESIZE != 64

  On ports with __TIMESIZE != 64 the remaining time argument always receives
pointer to struct __timespec64 instance. This is the different behavior
when compared to 64 bit versions of clock_nanosleep and nanosleep
functions, which receive NULL.

To avoid any potential issues, we also pass NULL when *rem pointer is
NULL.

Reported-by: Andreas Schwab <schwab@suse.de>
---
 sysdeps/unix/sysv/linux/clock_nanosleep.c | 3 ++-
 sysdeps/unix/sysv/linux/nanosleep.c       | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)
  

On 12/11/2020 11:25, Lukasz Majewski wrote:
> On ports with __TIMESIZE != 64 the remaining time argument always receives
> pointer to struct __timespec64 instance. This is the different behavior
> when compared to 64 bit versions of clock_nanosleep and nanosleep
> functions, which receive NULL.
> 
> To avoid any potential issues, we also pass NULL when *rem pointer is
> NULL.
> 
> Reported-by: Andreas Schwab <schwab@suse.de>

LGTM, thanks.

> ---
>  sysdeps/unix/sysv/linux/clock_nanosleep.c | 3 ++-
>  sysdeps/unix/sysv/linux/nanosleep.c       | 2 +-
>  2 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/sysdeps/unix/sysv/linux/clock_nanosleep.c b/sysdeps/unix/sysv/linux/clock_nanosleep.c
> index 6ad3321435..82cd11a564 100644
> --- a/sysdeps/unix/sysv/linux/clock_nanosleep.c
> +++ b/sysdeps/unix/sysv/linux/clock_nanosleep.c
> @@ -78,7 +78,8 @@ __clock_nanosleep (clockid_t clock_id, int flags, const struct timespec *req,
>    struct __timespec64 treq64, trem64;
>  
>    treq64 = valid_timespec_to_timespec64 (*req);
> -  r = __clock_nanosleep_time64 (clock_id, flags, &treq64, &trem64);
> +  r = __clock_nanosleep_time64 (clock_id, flags, &treq64,
> +                                rem != NULL ? &trem64 : NULL);
>  
>    if (r == EINTR && rem != NULL && (flags & TIMER_ABSTIME) == 0)
>      *rem = valid_timespec64_to_timespec (trem64);

Ok.

> diff --git a/sysdeps/unix/sysv/linux/nanosleep.c b/sysdeps/unix/sysv/linux/nanosleep.c
> index 8f4ee0f744..e58815c4d0 100644
> --- a/sysdeps/unix/sysv/linux/nanosleep.c
> +++ b/sysdeps/unix/sysv/linux/nanosleep.c
> @@ -39,7 +39,7 @@ __nanosleep (const struct timespec *req, struct timespec *rem)
>    struct __timespec64 treq64, trem64;
>  
>    treq64 = valid_timespec_to_timespec64 (*req);
> -  int ret = __nanosleep64 (&treq64, &trem64);
> +  int ret = __nanosleep64 (&treq64, rem != NULL ? &trem64 : NULL);
>  
>    if (ret != 0 && errno == EINTR && rem != NULL)
>      *rem = valid_timespec64_to_timespec (trem64);
> 

Ok.
  

On Thu, Nov 12, 2020 at 6:26 AM Lukasz Majewski <lukma@denx.de> wrote:
>
> On ports with __TIMESIZE != 64 the remaining time argument always receives
> pointer to struct __timespec64 instance. This is the different behavior
> when compared to 64 bit versions of clock_nanosleep and nanosleep
> functions, which receive NULL.
>
> To avoid any potential issues, we also pass NULL when *rem pointer is
> NULL.
>
> Reported-by: Andreas Schwab <schwab@suse.de>

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

Alistair

> ---
>  sysdeps/unix/sysv/linux/clock_nanosleep.c | 3 ++-
>  sysdeps/unix/sysv/linux/nanosleep.c       | 2 +-
>  2 files changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/sysdeps/unix/sysv/linux/clock_nanosleep.c b/sysdeps/unix/sysv/linux/clock_nanosleep.c
> index 6ad3321435..82cd11a564 100644
> --- a/sysdeps/unix/sysv/linux/clock_nanosleep.c
> +++ b/sysdeps/unix/sysv/linux/clock_nanosleep.c
> @@ -78,7 +78,8 @@ __clock_nanosleep (clockid_t clock_id, int flags, const struct timespec *req,
>    struct __timespec64 treq64, trem64;
>
>    treq64 = valid_timespec_to_timespec64 (*req);
> -  r = __clock_nanosleep_time64 (clock_id, flags, &treq64, &trem64);
> +  r = __clock_nanosleep_time64 (clock_id, flags, &treq64,
> +                                rem != NULL ? &trem64 : NULL);
>
>    if (r == EINTR && rem != NULL && (flags & TIMER_ABSTIME) == 0)
>      *rem = valid_timespec64_to_timespec (trem64);
> diff --git a/sysdeps/unix/sysv/linux/nanosleep.c b/sysdeps/unix/sysv/linux/nanosleep.c
> index 8f4ee0f744..e58815c4d0 100644
> --- a/sysdeps/unix/sysv/linux/nanosleep.c
> +++ b/sysdeps/unix/sysv/linux/nanosleep.c
> @@ -39,7 +39,7 @@ __nanosleep (const struct timespec *req, struct timespec *rem)
>    struct __timespec64 treq64, trem64;
>
>    treq64 = valid_timespec_to_timespec64 (*req);
> -  int ret = __nanosleep64 (&treq64, &trem64);
> +  int ret = __nanosleep64 (&treq64, rem != NULL ? &trem64 : NULL);
>
>    if (ret != 0 && errno == EINTR && rem != NULL)
>      *rem = valid_timespec64_to_timespec (trem64);
> --
> 2.20.1
>