[PATCH 15/23] linux: Add time64 semtimedop support

[Adhemerval Zanella]

Ping.

On 13/07/2020 14:10, Adhemerval Zanella wrote:
> Either the __NR_semtimedop_time64 (for 32-bit) or the __NR_semtimedop
> (for 64-bit) syscall is used as default.  The 32-bit fallback is used
> iff __ASSUME_TIME64_SYSCALLS is not defined, which assumes the kernel
> ABI provides either __NR_ipc or __NR_semtimeop (for 32-bit time_t).
> 
> Checked on x86_64-linux-gnu and i686-linux-gnu (on 5.4 and on 4.15
> kernel).
> ---
>  sysdeps/unix/sysv/linux/include/sys/sem.h |  6 +++
>  sysdeps/unix/sysv/linux/semtimedop.c      | 57 +++++++++++++++++++----
>  2 files changed, 55 insertions(+), 8 deletions(-)
> 
> diff --git a/sysdeps/unix/sysv/linux/include/sys/sem.h b/sysdeps/unix/sysv/linux/include/sys/sem.h
> index a9151e057d..f369c6b6d3 100644
> --- a/sysdeps/unix/sysv/linux/include/sys/sem.h
> +++ b/sysdeps/unix/sysv/linux/include/sys/sem.h
> @@ -7,9 +7,15 @@ __typeof__ (semtimedop) __semtimedop attribute_hidden;
>  
>  #if __TIMESIZE == 64
>  # define __semctl64 __semctl
> +# define __semtimedop64 __semtimedop
>  #else
> +# include <struct___timespec64.h>
> +
>  extern int __semctl64 (int semid, int semnum, int cmd, ...);
>  libc_hidden_proto (__semctl64);
> +extern int __semtimedop64 (int semid, struct sembuf *sops, size_t nsops,
> +			   const struct __timespec64 *tmo);
> +libc_hidden_proto (__semtimedop64);
>  #endif
>  
>  # endif
> diff --git a/sysdeps/unix/sysv/linux/semtimedop.c b/sysdeps/unix/sysv/linux/semtimedop.c
> index 6fdde09bad..d755a820d8 100644
> --- a/sysdeps/unix/sysv/linux/semtimedop.c
> +++ b/sysdeps/unix/sysv/linux/semtimedop.c
> @@ -22,18 +22,59 @@
>  #include <errno.h>
>  
>  /* Perform user-defined atomical operation of array of semaphores.  */
> +int
> +__semtimedop64 (int semid, struct sembuf *sops, size_t nsops,
> +		const struct __timespec64 *timeout)
> +{
> +#if defined __ASSUME_DIRECT_SYSVIPC_SYSCALLS
> +# ifndef __NR_semtimedop_time64
> +#  define __NR_semtimedop_time64 __NR_semtimedop
> +# endif
> +  int r = INLINE_SYSCALL_CALL (semtimedop_time64, semid, sops, nsops,
> +			       timeout);
> +#else
> +  int r = INLINE_SYSCALL_CALL (ipc, IPCOP_semtimedop, semid,
> +			       SEMTIMEDOP_IPC_ARGS (nsops, sops, timeout));
> +#endif
> +
> +#ifndef __ASSUME_TIME64_SYSCALLS
> +  if (r == 0 || errno != ENOSYS)
> +    return r;
> +
> +  struct timespec ts32, *pts32 = NULL;
> +  if (timeout != NULL)
> +    {
> +      if (! in_time_t_range (timeout->tv_sec))
> +	{
> +	  __set_errno (EINVAL);
> +	  return -1;
> +	}
> +      ts32 = valid_timespec64_to_timespec (*timeout);
> +      pts32 = &ts32;
> +    }
> +# if defined __ASSUME_DIRECT_SYSVIPC_SYSCALLS
> +  r = INLINE_SYSCALL_CALL (semtimedop, semid, sops, nsops, pts32);
> +# else
> +  r = INLINE_SYSCALL_CALL (ipc, IPCOP_semtimedop, semid,
> +			   SEMTIMEDOP_IPC_ARGS (nsops, sops, pts32));
> +# endif
> +#endif /* __ASSUME_TIME64_SYSCALLS  */
> +  return r;
> +}
> +#if __TIMESIZE != 64
> +libc_hidden_def (__semtimedop64)
>  
>  int
>  __semtimedop (int semid, struct sembuf *sops, size_t nsops,
>  	      const struct timespec *timeout)
>  {
> -  /* semtimedop wire-up syscall is not exported for 32-bit ABIs (they have
> -     semtimedop_time64 instead with uses a 64-bit time_t).  */
> -#if defined __ASSUME_DIRECT_SYSVIPC_SYSCALLS && defined __NR_semtimedop
> -  return INLINE_SYSCALL_CALL (semtimedop, semid, sops, nsops, timeout);
> -#else
> -  return INLINE_SYSCALL_CALL (ipc, IPCOP_semtimedop, semid,
> -			      SEMTIMEDOP_IPC_ARGS (nsops, sops, timeout));
> -#endif
> +  struct __timespec64 ts64, *pts64 = NULL;
> +  if (timeout != 0)
> +    {
> +      ts64 = valid_timespec_to_timespec64 (*timeout);
> +      pts64 = &ts64;
> +    }
> +  return __semtimedop64 (semid, sops, nsops, pts64);
>  }
> +#endif
>  weak_alias (__semtimedop, semtimedop)
>