Re: [Qemu-devel] [RFC 03/12] Add socket_writev_buffer function

[Orit Wasserman]

On 03/21/2013 11:47 AM, Paolo Bonzini wrote:
> Il 21/03/2013 10:47, Orit Wasserman ha scritto:
>> On 03/21/2013 11:18 AM, Paolo Bonzini wrote:
>>> Il 21/03/2013 10:09, Orit Wasserman ha scritto:
>>>> Signed-off-by: Orit Wasserman <address@hidden>
>>>> ---
>>>>  savevm.c | 14 ++++++++++++++
>>>>  1 file changed, 14 insertions(+)
>>>>
>>>> diff --git a/savevm.c b/savevm.c
>>>> index 35c8d1e..41dc87f 100644
>>>> --- a/savevm.c
>>>> +++ b/savevm.c
>>>> @@ -39,6 +39,7 @@
>>>>  #include "qmp-commands.h"
>>>>  #include "trace.h"
>>>>  #include "qemu/bitops.h"
>>>> +#include "qemu/iov.h"
>>>>  
>>>>  #define SELF_ANNOUNCE_ROUNDS 5
>>>>  
>>>> @@ -171,6 +172,18 @@ static void coroutine_fn yield_until_fd_readable(int 
>>>> fd)
>>>>      qemu_coroutine_yield();
>>>>  }
>>>>  
>>>> +static int socket_writev_buffer(void *opaque, struct iovec *iov, int 
>>>> iovcnt)
>>>> +{
>>>> +    QEMUFileSocket *s = opaque;
>>>> +    ssize_t len;
>>>> +
>>>> +    len = iov_writev(s->fd, iov, iovcnt);
>>>> +    if (len < iov_size(iov, iovcnt)) {
>>>> +        len = -socket_error();
>>>> +    }
>>>> +    return len;
>>>> +}
>>>
>>> This doesn't work on Windows, you need iov_send:
>>>
>>> ssize_t iov_send(int sockfd, struct iovec *iov, unsigned iov_cnt,
>>>                  size_t offset, size_t bytes);
>>>
>> iov_writev is implemented like iov_send the only difference is that it uses 
>> writev and not sendmsg
>> so it can work on files.
>> So in windows it will use send.
> 
> Yes, I would prefer to use send since here we know it's a socket.  See
> the general review, I don't think iov_writev is needed.
Sure.
> 
> Paolo
> 
>> Orit
>>> Paolo
>>>
>>> +
>>>>  static int socket_get_fd(void *opaque)
>>>>  {
>>>>      QEMUFileSocket *s = opaque;
>>>> @@ -387,6 +400,7 @@ static const QEMUFileOps socket_read_ops = {
>>>>  static const QEMUFileOps socket_write_ops = {
>>>>      .get_fd =     socket_get_fd,
>>>>      .put_buffer = socket_put_buffer,
>>>> +    .writev_buffer = socket_writev_buffer,
>>>>      .close =      socket_close
>>>>  };
>>>>  
>>>>
>>>
>>
>