Re: Data available for reading in a GIOChannel

[Armin Burgmeier <armin arbur net>]

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Tristan Van Berkom wrote:
> On Sun, 2007-05-27 at 16:57 +0200, Jonathan Winterflood wrote:
>> Hi,
>>
>> I need to read a large amount of data from a GIOChannel (200K, over the internet).
>>
>> So far, I use the gnet library to create the
>> socket, and then I use the GIOChannel to integrate the read/writing into the program's loop (a GTK application) 
>>
>> I use g_io_add_watch(_channel, G_IO_IN, &(_imageDataReadyForReading),
>> this); to register the callback for data reading.
>>
>> How can I determine the number of bytes available for reading, so as
>> not to block on reading the data? 
> 
> I dont know if gnet provides anything for this, what I typically
> do is:
> 
>    while (select (fds, readable condition)) {
>       read (a single byte of data);
>    }

I don't think this is very efficient because it calls select and read
for a every single byte you want to receive. I normally put the socket
in non-blocking mode and as soon as glib indicates readability I read
the data in 1024 byte chunks until I get EGAIN from recv() (or,
G_IO_STATUS_AGAIN from g_io_channel_read_chars(), respectively).

Greetings,
Armin
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