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Apache Portable Runtime Library (APR)
The Apache Portable Runtime Library provides a predictable and
consistent interface to underlying platform-specific
implementations, with an API to which software developers may code
and be assured of predictable if not identical behavior regardless
of the platform on which their software is built, relieving them of
the need to code special-case conditions to work around or take
advantage of platform-specific deficiencies or features.
APR and its companion libraries are implemented entirely in C
and provide a common programming interface across a wide variety
of operating system platforms without sacrificing performance.
Currently supported platforms include:
UNIX variants
Mac OS X
To give a brief overview, the primary core
subsystems of APR 1.3 include the following:
Atomic operations
Dynamic Shared Object loading
File I/O
Locks (mutexes, condition variables, etc)
Memory management (high performance allocators)
Memory-mapped files
Multicast Sockets
Network I/O
Shared memory
Thread and Process management
Various data structures (tables, hashes, priority queues, etc)
APR 2.0 also provides a number of utility functions and library
compatibility interfaces. These were formerly part of APR-util,
a seperate utility library in version 1 releases. These include;
Hashing and UUID services
Multiple SQL DBD client interfaces
Multiple flat-database DBM client interfaces
Typesafe function Hooks abstraction
MemCache interface
Date parsing rourtines
Resource Lists
Thread Pools
Relocatable Memory Management functions
String filename-style pattern matching
URI Parsing
Charset translation (iconv based)
XML parsing (expat based)
For a more complete list, please refer to the following URLs:
Users of APR 0.9 should be aware that migrating to the APR 1.x
programming interfaces may require some adjustments; APR 1.x is
neither source nor binary compatible with earlier APR 0.9 releases.
Users of APR 1.x can expect consistent interfaces and binary backwards
compatibility throughout the entire APR 1.x release cycle, as defined
in our versioning rules:
APR is already used extensively by the Apache HTTP Server
version 2 and the Subversion revision control system, to
name but a few. We list all known projects using APR at -- so please let us know
if you find our libraries useful in your own projects!
Database Providers
Interfaces for copy-left licensed MySQL and gdbm DBD drivers, and
Berkeley DB DBM all ship as part of the distribution. To avoid licensing
incompatibilities, these are not built by default. To enable support,
the corresponding use the --with-{provider} option, but be aware that
these licenses may introduce licensing implications for your compiled code.
Similarly, the bindings for propritary drivers such as Oracle must also be
explicitly enabled.
Whenever distributing apr-util in combination with database client
drivers, always review the license requirements of all components.
Using a Subversion Checkout on Unix
If you are building APR from SVN, you need to perform a prerequisite
step. You must have autoconf, libtool and python installed for this
to work. The prerequisite is simply;
If you are building APR from a distribution tarball, buildconf is
already run for you, and you do not need autoconf, libtool or python
installed or to run buildconf unless you have patched APR's buildconf
inputs (such as, build.conf, virtually any file within
the build/ tree, or you add or remove source files).
Remember when updating from svn that you must rerun ./buildconf again
to effect any changes made to the build schema in your fresh update.
Configuring and Building APR on Unix
./configure --prefix=/desired/path/of/apr
make test
make install
Configure has additional options, ./configure --help will offer you
those choices. You may also add CC=compiler CFLAGS="compiler flags"
etc. prior to the ./configure statement (on the same line). Please
be warned, some flags must be passed as part of the CC command,
itself, in order for autoconf to make the right determinations. Eg.;
CC="gcc -m64" ./configure --prefix=/desired/path/of/apr
will inform APR that you are compiling to a 64 bit CPU, and autoconf
must consider that when setting up all of APR's internal and external
type declarations.
For more verbose output from testall, you may wish to invoke testall
with the flag;
cd test
./testall -v
Building APR RPM files on Linux
Run the following to create SRPMs:
rpmbuild -ts apr-<version>.tar.bz2
rpmbuild -ts apr-util-<version>.tar.bz2
Run the following to create RPMs (or build from the SRPMs):
rpmbuild -tb apr-<version>.tar.bz2
rpmbuild -tb apr-util-<version>.tar.bz2
Resolve dependencies as appropriate.
Configuring and Building APR on Windows
Using Visual Studio, you can build and run the test validation of APR.
The make file has a bunch of documentation about it's
options, but a trivial build is simply;
nmake -f
nmake -f PREFIX=c:\desired\path\of\apr install
Note you must manually modify the include\apr.hw file before you
build to change default options, see the #define APR_HAS_... or the
#define APR_HAVE_... statements. Be careful, many of these aren't
appropriate to be modified. The most common change is
#define APR_HAVE_IPV6 1
rather than 0 if this build of APR will be used strictly on machines
with the IPv6 adapter support installed.
It's trivial to include the apr.dsp (for a static library) or the
libapr.dsp (for a dynamic library) in your own build project, or you
can load apr.dsw in Visual Studio 2002 (.NET) or later, which will
convert these for you into apr.sln and associated .vcproj files.
When using APR as a dynamic library, nothing special is required,
simply link to libapr-2.lib. To use it as a static library, simply
define APR_DECLARE_STATIC before you include any apr header files
in your source, and link to apr-2.lib instead.
On windows, selection of database drivers is via the environment values
DBD_LIST (for mysql, oracle, pgsql, sqlite2 and/or sqlite3)
and DBM_LIST (db and/or gdbm). DBD odbc and DBM sdbm are unconditionally
compiled and installed, do not include these in the list.
Generating Test Coverage information with gcc
If you want to generate test coverage data, use the following steps:
CFLAGS="-fprofile-arcs -ftest-coverage" ./configure
cd test
cd ..
make gcov
Cryptographic Software Notice
This distribution includes cryptographic software. The country in
which you currently reside may have restrictions on the import,
possession, use, and/or re-export to another country, of
encryption software. BEFORE using any encryption software, please
check your country's laws, regulations and policies concerning the
import, possession, or use, and re-export of encryption software, to
see if this is permitted. See for more
The U.S. Government Department of Commerce, Bureau of Industry and
Security (BIS), has classified this software as Export Commodity
Control Number (ECCN) 5D002.C.1, which includes information security
software using or performing cryptographic functions with asymmetric
algorithms. The form and manner of this Apache Software Foundation
distribution makes it eligible for export under the License Exception
ENC Technology Software Unrestricted (TSU) exception (see the BIS
Export Administration Regulations, Section 740.13) for both object
code and source code.
The following provides more details on the included cryptographic
APR provides an abstract interface for symmetrical cryptographic
functions that make use of a general-purpose encryption library,
such as OpenSSL, NSS, or the operating system's platform-specific
facilities. This interface is known as the apr_crypto interface,
with implementation beneath the /crypto directory.
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