Stacey, > Hi, my name is Stacey Simmons and I work under Rob Parsons at > WeatherTAP. I've been having some problems reading from STDIN in a > process that gets kicked off by an LDM PIPE command in the pqact.conf > file. I know you are a busy man and probably do not have any spare > time. I would really appreciate it if you could give me some input as > to what you think might be happening. Here is the situation. I've > written a tropical weather decoder that decodes the WTNT2 and WTNT3 text > products. These products are sent to my decoder with the following > command in the pqact.conf file: > > WMO ^(WTNT[2-3].) > PIPE /usr/bin/perl /wxhub/decoders/tropProdGen/tropProd.pl > > In the decoder I open STDIN and read in a line at a time using the > <STDIN> command. Once I reach the "$$", I send the data that I have > read to a decoding function. Once it finishes decoding, I come back and > read from STDIN again. The problem I'm having is that when I come back > from my decoding function and try to read STDIN, there is nothing there > to read even though there is about 5 more lines left in the product I'm > reading. I let the decoder run for up to 10 minutes waiting on STDIN. > What I have noticed is that the rest of the product I was reading only > comes in when a new product gets sent to my decoder. Do you know why > this would occur? For instance, I receive a WTNT2 product and when I > reach the "$$" in the data, I send the data on for decoding. After > returning form decoding, I'm trying to finish reading what is left of > the WTNT2 product from STDIN, but it acts like nothing is there to > read. A couple minutes later I get the WTNT3 product sent to this same > instance of my decoder and it then reads the rest of the WTNT2 product, > but my not read all of the WTNT3 product that was just sent. Does this > make sense? Do you have any idea what might be causing this? I've > attached the perl code that is called when data is sent to my decoder. > Again, any help or insight you could give me on why this is happening > would be greatly appreciated. Try using the "-flush" option of the PIPE action to flush the buffer between the pqact(1) process and your decoder. For more information, see <http://www.unidata.ucar.edu/software/ldm/ldm-current/basics/pqact.conf.html>. > Thank you, > Mr. Stacey Simmons > WeatherTAP.com Regards, Steve Emmerson Ticket Details =================== Ticket ID: KIS-841562 Department: Support LDM Priority: Normal Status: Closed
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