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Re: [Qemu-devel] [PATCH v6 1/8] linux-user: Add support for semtimedop()
From: |
Aleksandar Markovic |
Subject: |
Re: [Qemu-devel] [PATCH v6 1/8] linux-user: Add support for semtimedop() syscall |
Date: |
Wed, 4 Sep 2019 15:16:16 +0200 |
On Wed, Sep 4, 2019 at 3:11 PM Aleksandar Markovic <
address@hidden> wrote:
> From: Aleksandar Rikalo <address@hidden>
>
> Add support for semtimedop() emulation. It is based on invocation
> of safe_semtimedop().
>
> Conversion is left out of safe_semtimedop(), since other safe_xxx()
> usually don't contain similar conversions.
>
> Signed-off-by: Aleksandar Rikalo <address@hidden>
> Signed-off-by: Aleksandar Markovic <address@hidden>
> ---
>
Hi, Laurent.
Please note that Aleksandar R. proposed also a code segment mentioned
in this message:
https://lists.gnu.org/archive/html/qemu-devel/2019-07/msg07080.html
... but wasn't sure if he got all bits and peaces right. Please provide your
judgement - and I will modify the patch accordingly.
Thanks,
aleksandar
> linux-user/syscall.c | 40 ++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 40 insertions(+)
>
> diff --git a/linux-user/syscall.c b/linux-user/syscall.c
> index 8367cb1..b5bc6e4 100644
> --- a/linux-user/syscall.c
> +++ b/linux-user/syscall.c
> @@ -6649,7 +6649,43 @@ static inline abi_long host_to_target_statx(struct
> target_statx *host_stx,
> return 0;
> }
> #endif
> +#ifdef TARGET_NR_semtimedop
> +static inline abi_long do_semtimedop(int semid, abi_long ptr, unsigned
> nsops,
> + abi_long timeout)
> +{
> + struct sembuf *sops;
> + struct timespec ts, *pts;
> + abi_long ret;
> +
> + if (timeout) {
> + pts = &ts;
> + if (target_to_host_timespec(pts, timeout)) {
> + return -TARGET_EFAULT;
> + }
> + } else {
> + pts = NULL;
> + }
>
> + sops = g_malloc(sizeof(struct sembuf) * nsops);
> + if (sops == NULL) {
> + return -TARGET_EFAULT;
> + }
> +
> + if (target_to_host_sembuf(sops, ptr, nsops)) {
> + g_free(sops);
> + return -TARGET_EFAULT;
> + }
> +
> +#ifdef __NR_semtimedop
> + ret = get_errno(safe_semtimedop(semid, sops, nsops, pts));
> +#else
> + ret = -TARGET_ENOSYS;
> +#endif
> + g_free(sops);
> +
> + return ret;
> +}
> +#endif
>
> /* ??? Using host futex calls even when target atomic operations
> are not really atomic probably breaks things. However implementing
> @@ -9193,6 +9229,10 @@ static abi_long do_syscall1(void *cpu_env, int num,
> abi_long arg1,
> case TARGET_NR_semop:
> return do_semop(arg1, arg2, arg3);
> #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:
> return do_semctl(arg1, arg2, arg3, arg4);
> --
> 2.7.4
>
>
>
- [Qemu-devel] [PATCH v6 0/8] linux-user: Misc patches for 4.2, Aleksandar Markovic, 2019/09/04
- [Qemu-devel] [PATCH v6 1/8] linux-user: Add support for semtimedop() syscall, Aleksandar Markovic, 2019/09/04
- [Qemu-devel] [PATCH v6 2/8] linux-user: Add support for RNDRESEEDCRNG ioctl, Aleksandar Markovic, 2019/09/04
- [Qemu-devel] [PATCH v6 3/8] linux-user: Add support for FIOGETOWN and FIOSETOWN ioctls, Aleksandar Markovic, 2019/09/04
- [Qemu-devel] [PATCH v6 6/8] linux-user: Add support for FDRESET, FDRAWCMD, FDTWADDLE, and FDEJECT ioctls, Aleksandar Markovic, 2019/09/04
- Re: [Qemu-devel] [PATCH v6 6/8] linux-user: Add support for FDRESET, FDRAWCMD, FDTWADDLE, and FDEJECT ioctls, Laurent Vivier, 2019/09/06
- Re: [Qemu-devel] [PATCH v6 6/8] linux-user: Add support for FDRESET, FDRAWCMD, FDTWADDLE, and FDEJECT ioctls, Laurent Vivier, 2019/09/10