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<h3>Apache HTTP Server Version 1.3</h3>
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<h1 align="center">Manual Page: apxs</h1>
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<pre>
<strong>NAME</strong>
apxs - APache eXtenSion tool
<strong>SYNOPSIS</strong>
<strong>apxs</strong> -<strong>g</strong> [ -<strong>S</strong> <em>variable</em>=<em>value</em> ] -<strong>n</strong> <em>name</em>
<strong>apxs</strong> -<strong>q</strong> [ -<strong>S</strong> <em>variable</em>=<em>value</em> ] <em>query</em> ...
<strong>apxs</strong> -<strong>c</strong> [ -<strong>S</strong> <em>variable</em>=<em>value</em> ] [ -<strong>o</strong> <em>dsofile</em> ] [ -<strong>I</strong> <em>incdir</em> ] [
-<strong>D</strong> <em>variable</em>[=<em>value</em>] ] [ -<strong>L</strong> <em>libdir</em> ] [ -<strong>l</strong> <em>libname</em> ] [
-<strong>Wc,</strong><em>compiler</em>-<em>flags</em> ] [ -<strong>Wl,</strong><em>linker</em>-<em>flags</em> ] <em>files</em> ...
<strong>apxs</strong> -<strong>i</strong> [ -<strong>S</strong> <em>variable</em>=<em>value</em> ] [ -<strong>n</strong> <em>name</em> ] [ -<strong>a</strong> ] [ -<strong>A</strong> ] <em>dso-</em>
<em>file</em> ...
<strong>apxs</strong> -<strong>e</strong> [ -<strong>S</strong> <em>variable</em>=<em>value</em> ] [ -<strong>n</strong> <em>name</em> ] [ -<strong>a</strong> ] [ -<strong>A</strong> ] <em>dso-</em>
<em>file</em> ...
<strong>DESCRIPTION</strong>
<strong>apxs</strong> is a tool for building and installing extension modules
for the Apache HyperText Transfer Protocol (HTTP) server.
This is achieved by building a Dynamic Shared Object (DSO)
from one or more source or object <em>files</em> which then can be
loaded into the Apache server under runtime via the <strong>LoadMo-</strong>
<strong>dule</strong> directive from <strong>mod_so.</strong>
So to use this extension mechanism, your platform has to
support the DSO feature and your Apache <strong>httpd</strong> binary has to
be built with the <strong>mod_so</strong> module. The <strong>apxs</strong> tool automati-
cally complains if this is not the case. You can check this
yourself by manually running the command
$ httpd -l
The module <strong>mod_so</strong> should be part of the displayed list. If
these requirements are fulfilled, you can easily extend your
Apache server's functionality by installing your own modules
with the DSO mechanism by the help of this <strong>apxs</strong> tool:
$ apxs -i -a -c mod_foo.c
gcc -fpic -DSHARED_MODULE -I/path/to/apache/include -c mod_foo.c
ld -Bshareable -o mod_foo.so mod_foo.o
cp mod_foo.so /path/to/apache/libexec/mod_foo.so
chmod 755 /path/to/apache/libexec/mod_foo.so
[activating module `foo' in /path/to/apache/etc/httpd.conf]
$ apachectl restart
/path/to/apache/sbin/apachectl restart: httpd not running, trying to start
[Tue Mar 31 11:27:55 1998] [debug] mod_so.c(303): loaded module foo_module
/path/to/apache/sbin/apachectl restart: httpd started
$ _
The arguments <em>files</em> can be any C source file (.c), a object
file (.o) or even a library archive (.a). The <strong>apxs</strong> tool
automatically recognizes these extensions and automatically
uses the C source files for compilation while it just uses
the object and archive files for the linking phase. But when
using such pre-compiled objects, make sure they are compiled
for Position Independent Code (PIC) to be able to use them
for a DSO. For instance with GCC you always just have to use
<strong>-fpic</strong>. For other C compilers please consult its manual page
or watch for the flags <strong>apxs</strong> uses to compile the object
files.
For more details about DSO support in Apache, first read the
background information about DSO in htdocs/manual/dso.html,
then read the documentation of <strong>mod_so</strong>.
<strong>OPTIONS</strong>
Common options:
-<strong>n</strong> <em>name </em> This explicitly sets the module name for the -<strong>i</strong>
(install) and -<strong>g</strong> (template generation) option.
Use this to explicitly specify the module name.
For option -<strong>g</strong> this is required, for option -<strong>i</strong>
the <strong>apxs</strong> tool tries to determine the name from
the source or (as a fallback) at least by guess-
ing it from the filename.
Query options:
-<strong>q </strong> Performs a query for <strong>apxs</strong>'s knowledge about cer-
tain settings. The <em>query</em> parameters can be one
or more of the following variable names:
CC TARGET
CFLAGS SBINDIR
CFLAGS_SHLIB INCLUDEDIR
LD_SHLIB LIBEXECDIR
LDFLAGS_SHLIB SYSCONFDIR
LIBS_SHLIB PREFIX
Use this for manually determining settings. For
instance use
INC=-I`apxs -q INCLUDEDIR`
inside your own Makefiles if you need manual
access to Apache's C header files.
Configuration options:
-<strong>S</strong> <em>variable</em>=<em>value</em>
This option changes the <strong>apxs</strong> settings described
above.
Template Generation options:
-<strong>g </strong> This generates a subdirectory <em>name</em> (see option
-<strong>n</strong>) and there two files: A sample module source
file named <strong>mod_</strong><em>name</em>.<em>c</em> which can be used as a
template for creating your own modules or as a
quick start for playing with the <strong>apxs</strong> mechanism.
And a corresponding <strong>Makefile</strong> for even easier
building and installing of this module.
DSO compilation options:
-<strong>c </strong> This indicates the compilation operation. It
first compiles the C source files (.c) of <em>files</em>
into corresponding object files (.o) and then
builds a DSO in <em>dsofile</em> by linking these object
files plus the remaining object files (.o and
.a) of <em>files</em> If no -<strong>o</strong> option is specified the
output file is guessed from the first filename
in <em>files</em> and thus usually defaults to
<strong>mod_</strong><em>name</em>.<em>so</em>
-<strong>o</strong> <em>dsofile</em> Explicitly specifies the filename of the created
DSO file. If not specified and the name cannot
be guessed from the <em>files</em> list, the fallback
name <strong>mod_unknown.so</strong> is used.
-<strong>D</strong> <em>variable</em>[=<em>value</em>]
This option is directly passed through to the
compilation command(s). Use this to add your
own defines to the build process.
-<strong>I</strong> <em>incdir</em> This option is directly passed through to the
compilation command(s). Use this to add your
own include directories to search to the build
process.
-<strong>L</strong> <em>libdir</em> This option is directly passed through to the
linker command. Use this to add your own
library directories to search to the build pro-
cess.
-<strong>l</strong> <em>libname</em> This option is directly passed through to the
linker command. Use this to add your own
libraries to search to the build process.
-<strong>Wc,</strong><em>compiler</em>-<em>flags</em>
This option passes <em>compiler</em>-<em>flags</em> as additional
flags to the compiler command. Use this to add
local compiler-specific options.
-<strong>Wl,</strong><em>linker</em>-<em>flags</em>
This option passes <em>linker</em>-<em>flags</em> as additional
flags to the linker command. Use this to add
local linker-specific options.
DSO installation and configuration options:
-<strong>i </strong> This indicates the installation operation and
installs one or more DSOs into the server's
<em>libexec</em> directory.
-<strong>a </strong> This activates the module by automatically
adding a corresponding <strong>LoadModule</strong> line to
Apache's <strong>httpd.conf</strong> configuration file, or by
enabling it if it already exists.
-<strong>A </strong> Same as option -<strong>a</strong> but the created <strong>LoadModule</strong>
directive is prefixed with a hash sign (#), i.e.
the module is just prepared for later activation
but initially disabled.
-<strong>e </strong> This indicates the editing operation, which can
be used with the -<strong>a</strong> and -<strong>A</strong> options similarly to
the -<strong>i</strong> operation to edit Apache's <strong>httpd.conf</strong>
configuration file without attempting to install
the module.
<strong>EXAMPLES</strong>
Assume you have an Apache module named mod_foo.c available
which should extend Apache's server functionality. To accom-
plish this you first have to compile the C source into a DSO
suitable for loading into the Apache server under runtime
via the following command:
$ apxs -c mod_foo.c
gcc -fpic -DSHARED_MODULE -I/path/to/apache/include -c mod_foo.c
ld -Bshareable -o mod_foo.so mod_foo.o
$ _
Then you have to update the Apache configuration by making
sure a <strong>LoadModule</strong> directive is present to load this DSO. To
simplify this step <strong>apxs</strong> provides an automatic way to install
the DSO in the "libexec" directory and updating the
<strong>httpd.conf</strong> file accordingly. This can be achieved by run-
ning:
$ apxs -i -a mod_foo.c
cp mod_foo.so /path/to/apache/libexec/mod_foo.so
chmod 755 /path/to/apache/libexec/mod_foo.so
[activating module `foo' in /path/to/apache/etc/httpd.conf]
$ _
This way a line named
LoadModule foo_module libexec/mod_foo.so
is added to the configuration file if still not present. If
you want to have this operation to be disabled, use the -<strong>A</strong>
option, i.e.
$ apxs -i -A mod_foo.c
For a quick test of the <strong>apxs</strong> mechanism you can create a sam-
ple Apache module template plus a corresponding <strong>Makefile</strong>
via:
$ apxs -g -n foo
Creating [DIR] foo
Creating [FILE] foo/Makefile
Creating [FILE] foo/mod_foo.c
$ _
Then you can immediately compile this sample module into a
DSO and load it into the Apache server:
$ cd foo
$ make all reload
apxs -c mod_foo.c
gcc -fpic -DSHARED_MODULE -I/path/to/apache/include -c mod_foo.c
ld -Bshareable -o mod_foo.so mod_foo.o
apxs -i -a -n "foo" mod_foo.so
cp mod_foo.so /path/to/apache/libexec/mod_foo.so
chmod 755 /path/to/apache/libexec/mod_foo.so
[activating module `foo' in /path/to/apache/etc/httpd.conf]
apachectl restart
/path/to/apache/sbin/apachectl restart: httpd not running, trying to start
[Tue Mar 31 11:27:55 1998] [debug] mod_so.c(303): loaded module foo_module
/path/to/apache/sbin/apachectl restart: httpd started
$ _
You can even use <strong>apxs</strong> to compile complex modules outside the
Apache source tree, like PHP3, because <strong>apxs</strong> automatically
recognized C source files and object files.
$ cd php3
$ ./configure --with-shared-apache=../apache-1.3
$ apxs -c -o libphp3.so mod_php3.c libmodphp3-so.a
gcc -fpic -DSHARED_MODULE -I/tmp/apache/include -c mod_php3.c
ld -Bshareable -o libphp3.so mod_php3.o libmodphp3-so.a
$ _
Only C source files are compiled while remaining object
files are used for the linking phase.
<strong>SEE ALSO</strong>
<strong>apachectl(1), httpd(8).</strong>
</pre>
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