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| .TH "APXS" 8 "2003-11-25" "Apache HTTP Server" "apxs" |
| |
| .SH NAME |
| apxs \- APache eXtenSion tool |
| |
| .SH "SYNOPSIS" |
| |
| .PP |
| \fBapxs\fR -\fBg\fR [ -\fBS\fR \fIname\fR=\fIvalue\fR ] -\fBn\fR \fImodname\fR |
| |
| .PP |
| \fBapxs\fR -\fBq\fR [ -\fBS\fR \fIname\fR=\fIvalue\fR ] \fIquery\fR \&.\&.\&. |
| |
| .PP |
| \fBapxs\fR -\fBc\fR [ -\fBS\fR \fIname\fR=\fIvalue\fR ] [ -\fBo\fR \fIdsofile\fR ] [ -\fBI\fR \fIincdir\fR ] [ -\fBD\fR \fIname\fR=\fIvalue\fR ] [ -\fBL\fR \fIlibdir\fR ] [ -\fBl\fR \fIlibname\fR ] [ -\fBWc,\fR\fIcompiler-flags\fR ] [ -\fBWl,\fR\fIlinker-flags\fR ] \fIfiles\fR \&.\&.\&. |
| |
| .PP |
| \fBapxs\fR -\fBi\fR [ -\fBS\fR \fIname\fR=\fIvalue\fR ] [ -\fBn\fR \fImodname\fR ] [ -\fBa\fR ] [ -\fBA\fR ] \fIdso-file\fR \&.\&.\&. |
| |
| .PP |
| \fBapxs\fR -\fBe\fR [ -\fBS\fR \fIname\fR=\fIvalue\fR ] [ -\fBn\fR \fImodname\fR ] [ -\fBa\fR ] [ -\fBA\fR ] \fIdso-file\fR \&.\&.\&. |
| |
| |
| .SH "SUMMARY" |
| |
| .PP |
| apxs 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 \fIfiles\fR which then can be loaded into the Apache server under runtime via the LoadModule directive from mod_so\&. |
| |
| .PP |
| So to use this extension mechanism your platform has to support the DSO feature and your Apache httpd 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 |
| |
| .nf |
| |
| $ httpd -l |
| |
| .fi |
| |
| .PP |
| 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: |
| |
| .nf |
| |
| $ 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/modules/mod_foo\&.so |
| chmod 755 /path/to/apache/modules/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 |
| $ _ |
| |
| .fi |
| |
| .PP |
| The arguments \fIfiles\fR 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 used the C source files for compilation while just using 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 dynamically loaded shared object\&. For instance with GCC you always just have to use -fpic\&. For other C compilers consult its manual page or at watch for the flags apxs uses to compile the object files\&. |
| |
| .PP |
| For more details about DSO support in Apache read the documentation of mod_so or perhaps even read the src/modules/standard/mod_so\&.c source file\&. |
| |
| |
| .SH "OPTIONS" |
| |
| .SS "Common Options" |
| |
| |
| .TP |
| -n \fImodname\fR |
| This explicitly sets the module name for the -i (install) and -g (template generation) option\&. Use this to explicitly specify the module name\&. For option -g this is required, for option -i the apxs tool tries to determine the name from the source or (as a fallback) at least by guessing it from the filename\&. |
| |
| .SS "Query Options" |
| |
| |
| .TP |
| -q |
| Performs a query for apxs's knowledge about certain settings\&. The \fIquery\fR parameters can be one or more of the following strings: CC, CFLAGS, CFLAGS_SHLIB, INCLUDEDIR, LD_SHLIB, LDFLAGS_SHLIB, LIBEXECDIR, LIBS_SHLIB, SBINDIR, SYSCONFDIR, TARGET\&. .PP Use this for manually determining settings\&. For instance use .nf INC=-I`apxs -q INCLUDEDIR` .fi .PP inside your own Makefiles if you need manual access to Apache's C header files\&. |
| |
| .SS "Configuration Options" |
| |
| |
| .TP |
| -S \fIname\fR=\fIvalue\fR |
| This option changes the apxs settings described above\&. |
| |
| .SS "Template Generation Options" |
| |
| |
| .TP |
| -g |
| This generates a subdirectory \fIname\fR (see option -n) and there two files: A sample module source file named mod_\fIname\fR\&.c which can be used as a template for creating your own modules or as a quick start for playing with the apxs mechanism\&. And a corresponding Makefile for even easier build and installing of this module\&. |
| |
| .SS "DSO Compilation Options" |
| |
| |
| .TP |
| -c |
| This indicates the compilation operation\&. It first compiles the C source files (\&.c) of \fIfiles\fR into corresponding object files (\&.o) and then builds a dynamically shared object in \fIdsofile\fR by linking these object files plus the remaining object files (\&.o and \&.a) of \fIfiles\fR\&. If no -o option is specified the output file is guessed from the first filename in \fIfiles\fR and thus usually defaults to mod_\fIname\fR\&.so\&. |
| .TP |
| -o \fIdsofile\fR |
| Explicitly specifies the filename of the created dynamically shared object\&. If not specified and the name cannot be guessed from the \fIfiles\fR list, the fallback name mod_unknown\&.so is used\&. |
| .TP |
| -D \fIname\fR=\fIvalue\fR |
| This option is directly passed through to the compilation command(s)\&. Use this to add your own defines to the build process\&. |
| .TP |
| -I \fIincdir\fR |
| 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\&. |
| .TP |
| -L \fIlibdir\fR |
| This option is directly passed through to the linker command\&. Use this to add your own library directories to search to the build process\&. |
| .TP |
| -l \fIlibname\fR |
| This option is directly passed through to the linker command\&. Use this to add your own libraries to search to the build process\&. |
| .TP |
| -Wc,\fIcompiler-flags\fR |
| This option passes \fIcompiler-flags\fR as additional flags to the compiler command\&. Use this to add local compiler-specific options\&. |
| .TP |
| -Wl,\fIlinker-flags\fR |
| This option passes \fIlinker-flags\fR as additional flags to the linker command\&. Use this to add local linker-specific options\&. |
| |
| .SS "DSO Installation and Configuration Options" |
| |
| |
| .TP |
| -i |
| This indicates the installation operation and installs one or more dynamically shared objects into the server's \fImodules\fR directory\&. |
| .TP |
| -a |
| This activates the module by automatically adding a corresponding LoadModule line to Apache's httpd\&.conf configuration file, or by enabling it if it already exists\&. |
| .TP |
| -A |
| Same as option -a but the created LoadModule directive is prefixed with a hash sign (#), \fIi\&.e\&.\fR, the module is just prepared for later activation but initially disabled\&. |
| .TP |
| -e |
| This indicates the editing operation, which can be used with the -a and -A options similarly to the -i operation to edit Apache's httpd\&.conf configuration file without attempting to install the module\&. |
| |
| .SH "EXAMPLES" |
| |
| .PP |
| Assume 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 shared object suitable for loading into the Apache server under runtime via the following command: |
| |
| .nf |
| |
| $ 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 |
| $ _ |
| |
| .fi |
| |
| .PP |
| Then you have to update the Apache configuration by making sure a LoadModule directive is present to load this shared object\&. To simplify this step apxs provides an automatic way to install the shared object in its "modules" directory and updating the httpd\&.conf file accordingly\&. This can be achieved by running: |
| |
| .nf |
| |
| $ apxs -i -a mod_foo\&.c |
| cp mod_foo\&.so /path/to/apache/modules/mod_foo\&.so |
| chmod 755 /path/to/apache/modules/mod_foo\&.so |
| [activating module `foo' in /path/to/apache/etc/httpd\&.conf] |
| $ _ |
| |
| .fi |
| |
| .PP |
| This way a line named |
| |
| .nf |
| |
| LoadModule foo_module modules/mod_foo\&.so |
| |
| .fi |
| |
| .PP |
| is added to the configuration file if still not present\&. If you want to have this disabled per default use the -A option, \fIi\&.e\&.\fR |
| |
| .nf |
| |
| $ apxs -i -A mod_foo\&.c |
| |
| .fi |
| |
| .PP |
| For a quick test of the apxs mechanism you can create a sample Apache module template plus a corresponding Makefile via: |
| |
| .nf |
| |
| $ apxs -g -n foo |
| Creating [DIR] foo |
| Creating [FILE] foo/Makefile |
| Creating [FILE] foo/mod_foo\&.c |
| $ _ |
| |
| .fi |
| |
| .PP |
| Then you can immediately compile this sample module into a shared object and load it into the Apache server: |
| |
| .nf |
| |
| $ 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/modules/mod_foo\&.so |
| chmod 755 /path/to/apache/modules/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 |
| $ _ |
| |
| .fi |
| |
| .PP |
| You can even use apxs to compile complex modules outside the Apache source tree, like PHP3: |
| |
| .nf |
| |
| $ 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 |
| $ _ |
| |
| .fi |
| |
| .PP |
| because apxs automatically recognized C source files and object files\&. Only C source files are compiled while remaining object files are used for the linking phase\&. |
| |