Re: [PATCH hurd 8/9] boot: implement pseudo-time device

[Samuel Thibault]

Justus Winter, le Fri 07 Nov 2014 17:32:01 +0100, a écrit :
> * boot/boot.c (pseudo_time): New variable.
> (main): Allocate port `pseudo_time'.
> (ds_device_open): Give out `pseudo_time'.
> (ds_device_map): Emulate Mach-style `Mapped Time'.

Ack.

> ---
>  boot/boot.c | 38 +++++++++++++++++++++++++++++++++++---
>  1 file changed, 35 insertions(+), 3 deletions(-)
> 
> diff --git a/boot/boot.c b/boot/boot.c
> index d35ce50..747ab73 100644
> --- a/boot/boot.c
> +++ b/boot/boot.c
> @@ -112,7 +112,7 @@ typedef struct stat host_stat_t;
>  mach_port_t privileged_host_port, master_device_port;
>  mach_port_t pseudo_master_device_port;
>  mach_port_t receive_set;
> -mach_port_t pseudo_console, pseudo_root;
> +mach_port_t pseudo_console, pseudo_root, pseudo_time;
>  auth_t authserver;
>  
>  struct store *root_store;
> @@ -534,6 +534,15 @@ main (int argc, char **argv, char **envp)
>    if (foo != MACH_PORT_NULL)
>      mach_port_deallocate (mach_task_self (), foo);
>  
> +  mach_port_allocate (mach_task_self (), MACH_PORT_RIGHT_RECEIVE,
> +                   &pseudo_time);
> +  mach_port_move_member (mach_task_self (), pseudo_time, receive_set);
> +  mach_port_request_notification (mach_task_self (), pseudo_time,
> +                               MACH_NOTIFY_NO_SENDERS, 1, pseudo_time,
> +                               MACH_MSG_TYPE_MAKE_SEND_ONCE, &foo);
> +  if (foo != MACH_PORT_NULL)
> +    mach_port_deallocate (mach_task_self (), foo);
> +
>    if (kernel_command_line == 0)
>      asprintf (&kernel_command_line, "%s %s root=%s",
>             argv[0], bootstrap_args, bootdevice);
> @@ -894,6 +903,12 @@ ds_device_open (mach_port_t master_port,
>        *devicetype = MACH_MSG_TYPE_MAKE_SEND;
>        return 0;
>      }
> +  else if (!strcmp (name, "time"))
> +    {
> +      *device = pseudo_time;
> +      *devicetype = MACH_MSG_TYPE_MAKE_SEND;
> +      return 0;
> +    }
>    else if (strcmp (name, "pseudo-root") == 0)
>      /* Magic root device.  */
>      {
> @@ -1125,9 +1140,26 @@ ds_device_map (device_t device,
>              memory_object_t *pager,
>              int unmap)
>  {
> -  if (device != pseudo_console && device != pseudo_root)
> +  if (device == pseudo_console || device == pseudo_root)
> +    return D_INVALID_OPERATION;
> +  else if (device == pseudo_time)
> +    {
> +      error_t err;
> +      mach_port_t wr_memobj;
> +      file_t node = file_name_lookup ("/dev/time", O_RDONLY, 0);
> +
> +      if (node == MACH_PORT_NULL)
> +     return D_IO_ERROR;
> +
> +      err = io_map (node, pager, &wr_memobj);
> +      if (!err && MACH_PORT_VALID (wr_memobj))
> +     mach_port_deallocate (mach_task_self (), wr_memobj);
> +
> +      mach_port_deallocate (mach_task_self (), node);
> +      return D_SUCCESS;
> +    }
> +  else
>      return D_NO_SUCH_DEVICE;
> -  return D_INVALID_OPERATION;
>  }
>  
>  kern_return_t
> -- 
> 2.1.1
> 

-- 
Samuel
* x remarque qu'avec un peu de volonté, on peut faire du code de porc
dans d'importe quel langage Turing-complet
 -+- x sur #ens-mim - codons porc -+-