Ergonomic process launching with extreme flexibility and speed.

procex is a library for launching unix processes, that DOES NOT wrap createProcess. It interfaces directly with vfork and execve, and closes fds efficiently using the new close_range Linux syscall (or close if not available). The syntax for launching processes is clean, concise, and flexible, mimicking sh.

Hackage documentation

My blog post about using it as a shell (see example-shell directory).

About

procex is a library for launching unix processes, that DOES NOT wrap createProcess. It interfaces directly with vfork and execve, and closes fds efficiently using the new close_range Linux syscall (or close if not available). The syntax for launching processes is clean, concise, and flexible, mimicking sh.

Differences from shh, turtle, etc.

procex can:

• execve without fork, i.e. replace the current process
• Set fds besides 0, 1, and 2
• Launch a process without taking >0.5s when max fds is high
• Launch processes with an invalid UTF-8 name
• Be extended easily due to the flexible and simple API
• Be used as a shell
• not wrap Haskell functions in a Cmd like shh, because that is generally not a good solution

Example

import Procex.Prelude

main :: IO ()
main = captureLazy (mq "cat" <<< "some stdin") >>= \stdout -> putStrLn (show stdout)

TODO

• Setting the environment (workaround: use env from coreutils)
• Better README
• Support for non-Linux kernels.