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Manpages apxsSection: User Commands (1)Updated: April 1998 Index Return to Main Contents NAMEapxs - APache eXtenSion toolSYNOPSISapxs -g [ -S variable=value ] -n nameapxs -q [ -S variable=value ] query ... apxs -c [ -S variable=value ] [ -o dsofile ] [ -I incdir ] [ -D variable[=value] ] [ -L libdir ] [ -l libname ] [ -Wc,compiler-flags ] [ -Wl,linker-flags ] files ... apxs -i [ -S variable=value ] [ -n name ] [ -a ] [ -A ] dsofile ... apxs -e [ -S variable=value ] [ -n name ] [ -a ] [ -A ] dsofile ... DESCRIPTIONapxs 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 files which then can be loaded into the Apache server under runtime via the LoadModule directive from mod_so.So to use this extension mechanism, your platform has to support the DSO feature and your Apache apache binary has to be built with the mod_so module. The apxs tool automatically complains if this is not the case. You can check this yourself by manually running the command
$ apache -l The module mod_so 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 apxs 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 files can be any C source file (.c), a object file (.o) or even a library archive (.a). The apxs 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 Independend Code (PIC) to be able to use them for a DSO. For instance with GCC you always just have to use -fpic. For other C compilers please consult its manual page or watch for the flags apxs 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 mod_so.
OPTIONSCommon options:
Query options:
Configuration options:
Template Generation options:
DSO compilation options:
DSO installation and configuration options:
EXAMPLESAssume you have an Apache module named mod_foo.c available which should extend Apache's server functionality. To accomplish 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 LoadModule directive is present to load this DSO. To simplify this step apxs provides an automatic way to install the DSO in the "libexec" directory and updating the apache.conf file accordingly. This can be achieved by running:
$ 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 -A option, i.e.
$ apxs -i -A mod_foo.c For a quick test of the apxs mechanism you can create a sample Apache module template plus a corresponding Makefile 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 apxs to compile complex modules outside the Apache source tree, like PHP3, because apxs 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. SEE ALSOapachectl(1), apache(8).
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