DSOs should be written in the C Programming language. DSOs
written in C must be compiled on MPE/iX.
Two ways that Apache module's can be created are:
From a template,
such as mod_example.c, or from an existing
module.
With the apxs utility.
A sample module, mod_hw, will be used
to illustrate these two methods for creating a DSO module in C.
The mod_hw structure is shown in Figure 9-1 “Sample
Module (mod_hw)”.
The mod_hw consists of two source files,
mod_hw.c and hw.c.
The file mod_hw.c contains the module structure
and makes an external function call to pow() in
the math library (/lib/libm). The mod_hw.c also makes an
external function call to helloworld(), defined
in hw.c. The output of mod_hw prints "
Hello World" and also prints the result of raising
12 to the power of 2.
This module demonstrates how to build a DSO that calls external
functions. Using mod_hw as an example, you
will see how to compile and link an Apache module that calls an
external function from an object file and calls an external function
from a system library.
Note that modules are named mod_xxx.so by
convention. To follow this convention, the sample module is called mod_hw.so.
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