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Date: Thu, 21 Mar 2013 11:47:07 +0200
From: Orit Wasserman <owasserm@redhat.com>
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Subject: Re: [Qemu-devel] [RFC 03/12] Add socket_writev_buffer function
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To: Paolo Bonzini <pbonzini@redhat.com>
Cc: mst@redhat.com, chegu_vinod@hp.com, qemu-devel@nongnu.org, quintela@redhat.com

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 <owasserm@redhat.com>
>> ---
>>  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.

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
>>  };
>>  
>>
>