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Re: [Qemu-devel] [PATCH 03/20] char: add IOWatchPoll support
From: |
Anthony Liguori |
Subject: |
Re: [Qemu-devel] [PATCH 03/20] char: add IOWatchPoll support |
Date: |
Fri, 29 Mar 2013 07:24:07 -0500 |
User-agent: |
Notmuch/0.13.2+93~ged93d79 (http://notmuchmail.org) Emacs/23.3.1 (x86_64-pc-linux-gnu) |
Amit Shah <address@hidden> writes:
> On (Tue) 05 Mar 2013 [23:21:18], Amit Shah wrote:
>> From: Anthony Liguori <address@hidden>
>>
>> This is a special GSource that supports CharDriverState style
>> poll callbacks.
>>
>> For reviewability and bisectability, this code is #if 0'd out in this
>> patch to avoid unused warnings since all of the functions are static.
>>
>> Signed-off-by: Anthony Liguori <address@hidden>
>> Signed-off-by: Amit Shah <address@hidden>
>
>
>> +static int io_channel_send_all(GIOChannel *fd, const void *_buf, int len1)
>> +{
>> + GIOStatus status;
>> + gsize bytes_written;
>> + int len;
>> + const uint8_t *buf = _buf;
>> +
>> + len = len1;
>> + while (len > 0) {
>> + status = g_io_channel_write_chars(fd, (const gchar *)buf, len,
>> + &bytes_written, NULL);
>> + if (status != G_IO_STATUS_NORMAL) {
>> + if (status != G_IO_STATUS_AGAIN) {
>> + return -1;
>> + }
>
> It's not quite right to return -1 here; previous iterations of the
> while loop could have successfully written data, and (len1 - len)
> could be +ve.
Once -1 is returned, it's a terminal error. It doesn't matter that we
may have written some data.
Regards,
Anthony Liguori
>
> How to approach this? Convert all callers of qemu_chr_fe_write() to
> also pass a bytes_written param to handle this case?
>
>> + } else if (status == G_IO_STATUS_EOF) {
>> + break;
>> + } else {
>> + buf += bytes_written;
>> + len -= bytes_written;
>> + }
>> + }
>> + return len1 - len;
>> +}
>> +#endif
>> +
>> typedef struct {
>> int fd_in, fd_out;
>> int max_size;
>
> Amit
[Qemu-devel] [PATCH 04/20] qemu-char: convert fd_chr to use a GIOChannel, Amit Shah, 2013/03/05
[Qemu-devel] [PATCH 05/20] qemu-char: convert pty to GIOChannel, Amit Shah, 2013/03/05
[Qemu-devel] [PATCH 06/20] qemu-char: convert UDP to GIOChannel, Amit Shah, 2013/03/05
[Qemu-devel] [PATCH 07/20] qemu-char: tcp: make use GIOChannel, Amit Shah, 2013/03/05
[Qemu-devel] [PATCH 08/20] qemu-char: add watch support, Amit Shah, 2013/03/05
[Qemu-devel] [PATCH 09/20] qemu-char: add pty watch, Amit Shah, 2013/03/05
[Qemu-devel] [PATCH 10/20] char: add gio watch fn for tcp backends, Amit Shah, 2013/03/05