Hi, i think it is worth a mail thread to investigate the problem mentioned by Van Snyder in the course of thread "where does command output go".
Van Snyder wrote: > my program opens MyFifo (created by mkfifo if it > doesn't already exist) for reading and then runs "zcat TheFile.gz | MyFifo" > If one of the files is big, instead of zcat blocking until my program > consumes more data, they both block. Is the "|" in "zcat TheFile.gz | MyFifo" a typo ? I get an immediate error -bash: MyFifo : Permission denied When using the fifo as file target, i don't have problems with large data. In one terminal window i do zcat file.gz > MyFifo which blocks until i run in another terminal window: wc MyFifo which after about 7 seconds reports: 10476860 30976353 601600000 MyFifo The same happens if i start the data consumer first wc MyFifo and only then the data producer zcat file.gz > MyFifo In both cases, the first process blocks until the other gets started. Then processing goes plausibly fast. So please test that above gestures work for you as experienced by me. If so, then it is worth that you explain in more detail what your programs do differently. If above does not work for you, then the version numbers of Debian and of the Linux kernel would be of interest. (Not that i would have an idea what could go wrong ...) Have a nice day :) Thomas
