process

Process libraries

Version on this page:	1.6.1.0
LTS Haskell 23.19:	1.6.25.0
Stackage Nightly 2025-04-24:	1.6.19.0
Latest on Hackage:	1.6.26.0

See all snapshots process appears in

BSD-3-Clause licensed

Maintained by [email protected]

This version can be pinned in stack with:process-1.6.1.0@sha256:263e0a819c7c6de08a3aefbb72145efdd431985e00137ba83533841d83b53ba1,2370

Module documentation for 1.6.1.0

System
- System.Cmd
- System.Process
  - System.Process.Internals

Depends on 5 packages(full list with versions):

base, deepseq, directory, filepath, unix

Used by 132 packages in lts-11.22(full list with versions):

accelerate-llvm-ptx, Agda, amazonka-test, apply-refact, b9, bench, bhoogle, buchhaltung, c2hs, Cabal, cabal2nix, cabal-install, cabal-rpm, cartel, cmdargs, concurrent-output, conduit-extra, configuration-tools, debian-build, distribution-nixpkgs, doctest, dotenv, dyre, echo, editor-open, ersatz, extra, fedora-haskell-tools, funcmp, gauge, ghc, ghc-core, ghcid, gitrev, gnuplot, gtk2hs-buildtools, H, hakyll, hapistrano, happstack-server, and many more

This package contains libraries for dealing with system processes.

The typed-process package is a more recent take on a process API, which uses this package internally. It features better binary support, easier concurrency, and a more composable API. You can read more about it at https://haskell-lang.org/library/typed-process.

Changes

Changelog for `process` package

1.6.1.1 July 2017

Expose CGid, GroupID, and UserID from System.Process.Internals #90 #91

1.6.0.0 February 2017

Fix: waitForProcess race condition #46 #58

1.5.0.0 February 2017

Bug fix: Don’t close already closed pipes #81
Relax version bounds of Win32 to allow 2.5.
Add support for monitoring process tree for termination with the parameter use_process_jobs in CreateProcess on Windows. Also added a function terminateJob to kill entire process tree.

1.4.3.0 December 2016

New exposed withCreateProcess
Derive Show and Eq for CreateProcess, CmdSpec, and StdStream

1.4.2.0 January 2016

Added createPipeFD #52
- New function createPipeFD added which returns a POSIX File Descriptor (CInt) instead of a GHC Handle to a pipe

1.4.1.0 November 2015

Use less CPP #47
- Refactor to have separate Windows and POSIX modules internally
- Remove the broken non-GHC code paths

1.4.0.0 November 2015

Added child_user and child_group to CreateProcess for unix. #45

1.3.0.0 August 2015

Add StdStream(NoStream) to have standard handles closed. #13
Support for Windows DETACHED_PROCESS and setsid #32
Support for Windows CREATE_NEW_CONSOLE #38

1.2.3.0 March 2015

Meaningful error message when exe not found on close_fds is True
New functions readCreateProcess and readCreateProcessWithExitCode

1.2.2.0 Jan 2015

Fix delegated CTRL-C handling in createProcess in case of failed process creation. See issue #15 for more details.
waitpid on child PID after pre-exec failure in child to prevent zombies. See also issue #14.

1.2.1.0 Dec 2014

Add support for base-4.8.0.0
Remove Hugs98 specific code
New IsString CmdSpec instance
Expose documentation for System.Process.Internals
With GHC 7.10, System.Cmd and System.Process are now Safe (when compiled with older GHC versions they are just Trustworthy)
Expose createProcess_ function, and document behavior of UseHandle for createProcess. See issue #2.
New System.Process.createPipe operation. See also GHC #8943

1.2.0.0 Dec 2013

Update to Cabal 1.10 format
Remove NHC specific code
Add support for base-4.7.0.0
Improve showCommandForUser to reduce redundant quoting
New functions callProcess, callCommand, spawnProcess and spawnCommand
Implement WCE handling according to http://www.cons.org/cracauer/sigint.html
New delegate_ctlc field in CreateProcess for WCE handling
Use ExitFailure (-signum) on Unix when a proc is terminated due to a signal.
Deprecate module System.Cmd
On non-Windows, the child thread now comunicates any errors back to the parent thread via pipes.
Fix deadlocks in readProcess and readProcessWithExitCode