Re: [PATCH] linux-user: support of semtimedop syscall

[Laurent Vivier <laurent@vivier.eu>]

Le 11/05/2020 à 18:39, Matus Kysel a écrit :
> We should add support of semtimedop syscall as new version of
> glibc 2.31 uses semop based on semtimedop (commit: https://gitlab.com/freedesktop-sdk/mirrors/sourceware/glibc/-/commit/765cdd0bffd77960ae852104fc4ea5edcdb8aed3 ).
> 
> Signed-off-by: Matus Kysel <mkysel@tachyum.com>
> ---
>  linux-user/syscall.c | 26 +++++++++++++++++++++-----
>  1 file changed, 21 insertions(+), 5 deletions(-)
> 
> diff --git a/linux-user/syscall.c b/linux-user/syscall.c
> index 3a924c0004..cb3978a2a5 100644
> --- a/linux-user/syscall.c
> +++ b/linux-user/syscall.c
> @@ -3879,21 +3879,32 @@ static inline abi_long target_to_host_sembuf(struct sembuf *host_sembuf,
>      return 0;
>  }
>  
> -static inline abi_long do_semop(int semid, abi_long ptr, unsigned nsops)


You should add around this function:

#if defined(TARGET_NR_ipc) || defined(TARGET_NR_semop) ||
defined(TARGET_NR_semtimedop)

> +static inline abi_long do_semtimedop(int semid,
> +                                     abi_long ptr,
> +                                     unsigned nsops,
> +                                     abi_long timeout)
>  {
>      struct sembuf sops[nsops];
> +    struct timespec ts, *pts = NULL;
>      abi_long ret;
>  
> +    if (timeout) {
> +        pts = &ts;
> +        if (target_to_host_timespec(pts, timeout)) {

You should add the same #ifdef around target_to_host_timespec().

> +            return -TARGET_EFAULT;
> +        }
> +    }
> +
>      if (target_to_host_sembuf(sops, ptr, nsops))
>          return -TARGET_EFAULT;
>  
>      ret = -TARGET_ENOSYS;
>  #ifdef __NR_semtimedop
> -    ret = get_errno(safe_semtimedop(semid, sops, nsops, NULL));
> +    ret = get_errno(safe_semtimedop(semid, sops, nsops, pts));
>  #endif
>  #ifdef __NR_ipc
>      if (ret == -TARGET_ENOSYS) {
> -        ret = get_errno(safe_ipc(IPCOP_semtimedop, semid, nsops, 0, sops, 0));
> +        ret = get_errno(safe_ipc(IPCOP_semtimedop, semid, nsops, 0, sops, pts));
>      }
>  #endif
>      return ret;
> @@ -4373,7 +4384,8 @@ static abi_long do_ipc(CPUArchState *cpu_env,
>  
>      switch (call) {
>      case IPCOP_semop:
> -        ret = do_semop(first, ptr, second);
> +    case IPCOP_semtimedop:
> +        ret = do_semtimedop(first, ptr, second, third);

Are you sure "third" is NULL in case of IPCOP_semop?

You should explicitly keep

    ret = do_semtimedop(first, ptr, second, NULL);

for IPCOP_semop.

>          break;
>  
>      case IPCOP_semget:
> @@ -9608,7 +9620,11 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1,
>  #endif
>  #ifdef TARGET_NR_semop
>      case TARGET_NR_semop:
> -        return do_semop(arg1, arg2, arg3);
> +        return do_semtimedop(arg1, arg2, arg3, 0);
> +#endif
> +#ifdef TARGET_NR_semtimedop
> +    case TARGET_NR_semtimedop:
> +        return do_semtimedop(arg1, arg2, arg3, arg4);
>  #endif
>  #ifdef TARGET_NR_semctl
>      case TARGET_NR_semctl:
> 

Thanks,
LAurent