On 2009 Jan 22, at 3:11, Belka wrote:
Actually, I'm more interested in technical details how to communicate from shell with background process - how to send commands to it. Currently looking into POSIX libraries hope to find answers there... Also, maybe a FIFO-pipe-file would solve my problem. Imagine writing a command in it, while one of daemon's thread is locked-while-awaits for anything to come out from the other side of the pipe...
You can try it; make sure to open the FIFO for read+write to avoid deadlocks, and I think there are some weird behaviors caused by the GHC runtime's non-blocking IO. It will be a lot easier to use a socket (AF_INET or AF_UNIX depending on whether you want to support remote access or not). -- brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allbery@kf8nh.com system administrator [openafs,heimdal,too many hats] allbery@ece.cmu.edu electrical and computer engineering, carnegie mellon university KF8NH