[Mono-list] Questions on Mono.Unix.Pipes

[Ian Norton]

Sounds like for you it would be easier to just pinvoke a byte array. I guess it
depends how much data is involved.

On Mon, Dec 17, 2012 at 05:05:07PM +0000, mickeyf wrote:
> I have some questions about Mono.Unix.Pipes.
> 
> I have been using this with some success, but I am relatively new to Linux,
> and the mono documentation that I have found is missing or incomplete. The
> Linux manual pages docs on pipes are clearly referring to a different animal
> than this.
> 
> Specifically, I have been creating a pipe in a Mono app, passing the handle
> of the write end to a shared library. The shared library writes data to the
> pipe, which is read by the read end of the pipe on the mono app. This works,
> although the case in which all the data is not gotten in a single read
> operation gets messy.
> 
> It appears that I can read a pipe as mypipes.readend.Read(buffer_to_read_to,
> read_position, bytes_to_read).
> 
> I understand that I can't actually fseek using read_position, but it seems
> that if I do not read the entire bytes_to_read, I can then continue to
> adjust read_position to read the remaining data.
> 
> 1) Is this correct usage, or am I missing something here?
> 
> 2) Since I can't find documentation specific to this, it's not clear what
> the return values from Read will be when I can't actually read anything.
> Does -1 indicate error, or simply "no data available"? What about 0?
> 
> 3) Can I set the write end to disable O_NONBLOCK, and does this guarantee
> that both the write and the read are atomic and that all bytes will in fact
> be read in a single read on the read end of the pipe? (Assuming no SIG???)
> If so, how do I do this?
> 
> If there is actual detailed documentation on Mono.Unix.Pipes, directing me
> to that would be great.
> 
> Or, since what I really want to do is guarantee that a entire (privately
> defined) data packet as written by my C library code is read by my mono app,
> perhaps there is an entirely different, and better way to do this? Sockets?
> Or...?
> 
> Thanks
> 
> 
> 
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