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README

libpipeline, a pipeline manipulation library
============================================

libpipeline is a C library for setting up and running pipelines of
processes, without needing to involve shell command-line parsing which is
often error-prone and insecure.  This alleviates programmers of the need to
laboriously construct pipelines using lower-level primitives such as fork(2)
and execve(2).

Full programmers' documentation may be found using 'man libpipeline'.

Installation
------------

If you need to install libpipeline starting from source code, then you will
need these separate packages installed before configuring libpipeline in
order to run its test suite:

pkg-config (http://www.freedesktop.org/wiki/Software/pkg-config)
  check (http://check.sourceforge.net/)

See the INSTALL file for general installation instructions.

Building programs with libpipeline
----------------------------------

libpipeline supplies a pkg-config file which lists appropriate compiler and
linker flags for building programs using it.  The output of 'pkg-config
--cflags libpipeline' should be passed to the compiler (typically CFLAGS)
and the output of 'pkg-config --libs libpipeline' should be passed to the
linker (typically LDFLAGS).

If your program uses the GNU Autotools, then you can put this in
configure.ac:

PKG_CHECK_MODULES([libpipeline], [libpipeline])

... and this in the appropriate Makefile.am (replacing 'program' with the
Automake-canonicalised name for your program):

AM_CFLAGS = $(libpipeline_CFLAGS)
  program_LDADD = $(libpipeline_LIBS)

The details may vary for particular build systems, but this should be a
reasonable start.

When building with GCC, you should use at least the -Wformat option
(included in -Wall) to ensure that the 'sentinel' function attribute is
checked.  This means that your program will produce a warning if it calls
any of the several libpipeline functions that require a trailing NULL
without passing that trailing NULL.

Copyright (C) 1994 Markus Armbruster.
Copyright (C) 1989, 1990, 1991, 1992, 2000, 2001, 2002, 2003, 2004, 2005,
              2006, 2007, 2008, 2009, 2010
              Free Software Foundation, Inc.
Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 Colin Watson.

libpipeline is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or (at
your option) any later version.

libpipeline is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with libpipeline; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301
USA.

Note on GPL versions
--------------------

(This note is informative, and if it conflicts with the terms of the licence
then the licence is correct.  See the full text of the licence in the
COPYING file for precise details.)

The core source code of libpipeline is licensed under GPL v2 or later.
However, libpipeline incorporates parts of the Gnulib portability library,
copyrighted by the Free Software Foundation and others, and much of Gnulib
is distributed under GPL v3 or later.  This means that libpipeline as a
whole falls under the terms of the GPL v3 or later.  Unless you take special
pains to remove the GPL v3 portions, you must therefore follow the terms and
conditions of the GPL v3 or later when distributing libpipeline itself, or
distributing code linked against it.

Note that this does not require that your own source code be licensed under
the GPL v3, contrary to popular misunderstanding.  However, you must be
prepared to distribute your work as a whole under the terms of the GPL v3 or
later, which requires that your licence be compatible with the GPL v3.  See
http://www.gnu.org/licenses/license-list.html#GPLCompatibleLicenses if you
need advice on compatibility.

The GPL mainly restricts distribution ("conveying", in the specific language
of GPL v3), and is careful not to restrict private use.  Therefore, you may
write programs for your own use that use libpipeline without needing to
license them under GPL v3-compatible terms.  If you distribute these
programs to others, then you must take care to use compatible licensing.

Credits
-------

Thanks to Scott James Remnant for code review, Ian Jackson for an extensive
design review, and Kees Cook and Matthias Klose for helpful conversations.

-- Colin Watson <cjwatson@debian.org>

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	drwxr-xr-x	2016-07-20 03:57:44
..	dir	-	root/root	drwxr-xr-x	2026-01-07 03:21:50
COPYING	file	34.32 KB	root/root	-rw-r--r--	2010-10-12 12:00:56
ChangeLog	file	46.49 KB	root/root	-rw-r--r--	2013-04-24 06:48:40
NEWS	file	1.34 KB	root/root	-rw-r--r--	2013-04-24 06:49:03
README	file	4.64 KB	root/root	-rw-r--r--	2011-10-10 08:22:37