YAZ User's Guide and Reference
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# UNIX

Note that if your system doesn't have a native ANSI C compiler, you may have to acquire one separately. We recommend GCC.

For UNIX, the GNU tools Autoconf, Automake and Libtool is used to generate Makefiles and configure YAZ for the system. You do not these tools unless you're using the CVS version of YAZ. Generally it should be sufficient to run configure without options, like this:

        ./configure

The configure script attempts to use use the C compiler specified by the `CC` environment variable. If not set, GNU C will be used if it is available. The `CFLAGS` environment variable holds options to be passed to the C compiler. If you're using Bourne-compatible shell you may pass something like this to use a particular C compiler with optimization enabled:

        CC=/opt/ccs/bin/cc CFLAGS=-O ./configure

To customize YAZ, the configure script also accepts a set of options. The most important are:

`--prefix` path

  Specifies installation prefix. This is only needed if you run `make install` later to perform a "system" installation. The prefix is `/usr/local` if not specified.

`--enable-tcpd`

  The front end server will be built using Wietse's TCP wrapper library. It allows you to allow/deny clients depending on IP number. The TCP wrapper library is often used in Linux/BSD distributions.

`--enable-threads`

  YAZ will be built using POSIX threads. Specifically, `_REENTRANT` will be defined during compilation.

`--with-openssl`

  YAZ will be linked with the OpenSSL libraries and an SSL COMSTACK will be provided. Note that SSL support is still experimental.

`--enable-shared`

  The make process will create shared libraries (also known as shared objects `.so`). By default, no shared libraries are created - equivalent to `--disable-shared`.

`--disable-shared`

  The make process will not create static libraries (`.a`). By default, static libraries are created - equivalent to `--enable-static`.

When configured, build the software by typing:

         make

The following files are generated by the make process:

`lib/libyaz.la`

  Main YAZ library. This is no ordinary library. It's a Libtool archive. By default, YAZ creates a static library in `lib/.libs/libyaz.a`.

`lib/libyazthread.la`

  When threading is supported/enabled by configure this Libtool library is created. It includes functions that allows YAZ to use threads.

`ztest/yaz-ztest`

  Test Z39.50 server.

`client/yaz-client`

  Z39.50 client for testing the protocol. See chapter YAZ client for more information.

`yaz-config`

  A Bourne-shell script, generated by configure, that specifies how external applications should compile - and link with YAZ.

`yaz-comp`

  The ASN.1 compiler for YAZ. Requires the Tcl Shell, tclsh, in `PATH` to operate.

`zoom/zoomsh`

  A simple shell implemented on top of the ZOOM functions. The shell is a command line application that allows you to enter simple commands to perform ZOOM operations.

`zoom/zoomtst1`, `zoom/zoomtst2`, ..

  Several small applications that demonstrates the ZOOM API.

If you wish to install YAZ in system directories `/usr/local/bin`, `/usr/local/lib` .. etc, you can type:

        make install

You probably need to have root access in order to perform this. You must specify the `--prefix` option for configure if you wish to install YAZ in other directories than the default `/usr/local/`.

If you wish to perform an un-installation of YAZ, use:

        make uninstall

This will only work if you haven't reconfigured YAZ (and therefore changed installation prefix). Note that uninstall will not remove directories created by make install, e.g. `/usr/local/include/yaz`.

## How to make apps using YAZ on UNIX

This section describes how to compile - and link your own applications using the YAZ toolkit. If you're used to Makefiles this shouldn't be hard. As for other libraries you have used before, you have to set a proper include path for your C/C++ compiler and specify the location of YAZ libraries. You can do it by hand, but generally we suggest you use the `yaz-config` that is generated by `configure`. This is especially important if you're using the threaded version of YAZ which require you to pass more options to your linker/compiler.

The `yaz-config` script accepts command line options that makes the `yaz-config` script print options that you should use in your make process. The most important ones are: `--cflags`, `--libs` which prints C compiler flags, and linker flags respectively.

A small and complete `Makefile` for a C application consisting of one source file, `myprog.c`, may look like this:

          YAZCONFIG=/usr/local/bin/yaz-config
          CFLAGS=`$(YAZCONFIG) --cflags`
          LIBS=`$(YAZCONFIG) --libs`
          myprog: myprog.o
             $(CC) $(CFLAGS) -o myprog myprog.o $(LIBS)

The CFLAGS variable consists of a C compiler directive that will set the include path to the parent directory of `yaz`. That is, if YAZ header files were installed in `/usr/local/include/yaz`, then include path is set to `/usr/local/include`. Therefore, in your applications you should use

          #include <yaz/proto.h>

and not

          #include <proto.h>

For Libtool users, the `yaz-config` script provides a different variant of option `--libs`, called `--lalibs` that returns the name of the Libtool acrhive(s) for YAZ rather than the ordinary ones.

For applications using the threaded version of YAZ, specify `threads` after the other options. When `threads` is given, more flags and linker flags will be printed by `yaz-config`. If our previous example was using threads, you'd have to modify the lines that set `CFLAGS` and `LIBS` as follows:

          CFLAGS=`$(YAZCONFIG) --cflags threads`
          LIBS=`$(YAZCONFIG) --libs threads`

There is no need specify POSIX thread libraries in your Makefile. The `LIBS` variable includes that as well.

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