Re: filesize of fifo

[Alex Verstak]

Have a look at http://expect.nist.gov/ .  You will like it.

=alex


On Mon, 5 Feb 2001, John W. Eaton wrote:

> On 31-Jan-2001, Paul Kienzle <address@hidden> wrote:
> 
> | The better way is to make the read-end of your fifo non-blocking:
> |    fid = fopen("fifo", "r"); 
> |    fcntl(fid, F_SETFL, O_NONBLOCK);
> | It appears that O_NONBLOCK must be set immediately after opening.
> | Note that the fopen call will block until the write-end has been opened.
> | 
> | Now you can do fread/fgets calls as normal.  However, if you ever run out
> | of input, then Octave will think that you have encountered an end of file
> | and will refuse to try to read any more.  As a workaround, you can close
> | and reopen the file and it will work as normal (with only a 4 ms overhead
> | on my Pentium 166), but this is ugly.  Anyone know what's going on?
> 
> Octave doesn't really have all it needs to properly do nonblocking
> I/O.  You would probably want to be able to call read (or fread) and
> have it not set EOF if there is nothing to read.  You would probably
> want to be able to check errno to see if it was set to EAGAIN (if read
> returns -1 and errno is set to this, it means that there was nothing
> to read, so you would want to wait and try again later).  And, you
> might also want to have access to select().
> 
> jwe
> 
> 
> 
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Octave is freely available under the terms of the GNU GPL.

Octave's home on the web:  http://www.octave.org
How to fund new projects:  http://www.octave.org/funding.html
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