part of shnell – a source to source compiler enhancement tool

© Jens Gustedt, 2019

Launch a server process that is connected to one or two pipes

Usage

server PROGRAM INPUT OUTPUT

Where PROGRAM is a filter program that will listen on INPUT and write to OUTPUT. INPUT and OUTPUT should be filenames in the ${tmpd} or ${TMPD} directories. Named pipes will be enabled at these names, if they do not yet exist. If you just want to have these as temporary files and not as named pipes, you’d have to ensure that they already exist.

One of INPUT or OUTPUT but not both may be an empty string. If INPUT is empty, this results in process that produces data on the OUTPUT named pipe. IF OUTPUT is empty, the process receives data through INPUT and does whatever it is designed to do with it.

Example

npipe="${tmpd}/npipe$$.pipe"
server "sed 's![[:cntrl;]]! !g'" "${npipe}" ""
exec >"${npipe}"

establishes a filter process that removes all control characters from the stdout stream of the current process.

Coding and configuration

SRC="$_" . "${0%%/${0##*/}}/import.sh"

Imports

The following sh-modules are imported:

• tmpd

Details

MKNOD=${MKNOD:=mknod}