Proc-Spawner version 0.01 (EXPERIMENTAL)
========================================

Runs shell one-liners from Perl without /bin/sh and without fork, matching
dash: the strings are parsed by one of the Proc::ShellSubset parsers and run
by Proc::ShellSpawn, which starts programs with posix_spawn(3) and runs loops,
subshells, $( ) and pipelines of compound commands inside the Perl process.

  Proc::Spawner          start children (every posix_spawn setting); the event loop
  Proc::Spawner::Graph   the executable graph of children, pipes and files
  Proc::ShellSpawn       the shell layer
  Proc::ShellSubset, Proc::ShellSubset::Small, Proc::ShellSubset::Large
                         parsers of three sizes of the shell language

Tested on Linux with glibc 2.39 (also built as if some or all of the
extensions were missing: PROC_SPAWNER_WITHOUT="PIDFD_SPAWN ..." perl Makefile.PL).  Parts that flip process-wide
state for a while (umask, signal actions) are bullet-proof only in
non-threaded execution.

INSTALLATION

To install this module type the following:

   perl Makefile.PL
   make
   make test
   make install

DEPENDENCIES

Only modules that come with Perl.  Building needs a C compiler.
Makefile.PL finds which posix_spawn extensions the libc has (chdir, fchdir,
closefrom, tcsetpgrp, pidfd_spawn, cgroup) by compiling a call to each; an
option the libc lacks fails with ENOTSUP, or is dropped, as
%Proc::Spawner::UNSUPPORTED says.  The shell layer needs chdir (glibc 2.29
or later); without it t/dash.t is skipped.

Tests: t/spawner.t (Proc::Spawner and the graph), t/graph.t (hand-written
graphs), t/parsers.t (about 1,000 strings through the parsers), and t/dash.t
(every battery string run by dash and by the shell layer; skipped without
dash; t/dash-known.txt lists the known differences).  Their fixtures are
in t/: t/batteries/, t/parser/, t/sgraph/, t/try.pl (runs one string: perl t/try.pl 'STRING').

COPYRIGHT AND LICENCE

Copyright (C) 2026 by Ilya Zakharevich

This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself, either Perl version 5.22.2 or,
at your option, any later version of Perl 5 you may have available.