I will need to do some testing. Here is an example of fopen using a named
pipe
mkfifo fifoname
/* issue fopen for write end of the fifo */
wr_stream = fopen(fifoname,"w");
from:
http://www.ibm.com/support/knowledgecenter/SSLTBW_2.1.0/com.ibm.zos.v2r1.cbcpx01/fifopip.htm
The "wb" your listing has add the "b" but based on what I have found
the "b" adds nothing and is the same as just "w." The documentation
I found states it is only added for ISO C standard conformance.
I will need to do some more testing and report back.
On Sat, Dec 31, 2016 at 3:32 PM, Richard Hipp <[email protected]> wrote:
> On 12/31/16, Paul Lambert <[email protected]> wrote:
> > I have observed that the file write mode of this function when using the
> > same file name a second time will delete the previous data in the file.
> > This is most likely accomplished by deleting the file and recreating a
> new
> > one. if so then this explains why the .output function locks up when
> using
> > a named pipe as the pipe is not responding to a delete command.
>
> It just calls fopen(). http://www.sqlite.org/src/
> artifact/6095531aa9?ln=2609
>
> I don't know what fopen() is doing behind the scenes. Probably it
> works differently on different systems, but I would have guessed that
> it just invoked open() with O_TRUNC.
>
>
> >
> > Pipes are files and the ability to launch an application and place a
> > pending read on the pipe is such that the system will block the read and
> > the application will hang on the read statement until something shows up.
> > In the case of a file this is not true.
> >
> > I believe this command needs to be modified so that it performs a "stat"
> to
> > determine if the target is a file or named pipe. If a named pipe then
> omit
> > the call to delete it. This function should additionally check to make
> > sure the target is a file and not a directory too as user typos will most
> > certainly lead to unknown results.
> > _______________________________________________
> > sqlite-users mailing list
> > [email protected]
> > http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users
> >
>
>
> --
> D. Richard Hipp
> [email protected]
> _______________________________________________
> sqlite-users mailing list
> [email protected]
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>
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