What Happens When You Compile and Link a Program

Running the Program

Running the Program

An executable file is created after the program has been compiled and linked. The next step is to run or load the program.

Loading Programs: exec

When you run an executable file created by ld, the program is loaded into memory by the HP-UX program loader, exec. This routine is actually a system call and can be called by other programs to load a new program into the current process space. The exec function performs many tasks; some of the more important ones are:

•Determine how to load the executable file by looking at its magic number. (See Also “The a.out File”.)

•Determine where to begin execution of the program — that is, the entry point — usually in crt0.o. (See Also “The crt0.o Startup File”.)

•When the program uses shared libraries, the crt0.o startup code invokes the dynamic loader (dld.sl), which in turn attaches any required shared libraries. If immediate binding was specified at link time, then the libraries are bound immediately. If deferred binding was specified, then libraries are bound as they are referenced. (See Also “What are Shared Libraries?” on page 126.)For details on exec, see the exec(2) page in the HP-UX Reference.

Binding Routines to a Program

Since shared library routines and data are not actually contained in the a.out file, the dynamic loader must attach the routines and data to the program at run time. Attaching a shared library entails mapping the shared library code and data into the process's address space, relocating any pointers in the shared library data that depend on actual virtual addresses, allocating the bss segment, and binding routines and data in the shared library to the program.

The dynamic loader binds only those symbols that are reachable during the execution of the program. This is similar to how archive libraries are treated by the linker; namely, ld pulls in an object file from an archive library only if the object file is needed for program execution.

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Chapter 2

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Kenwood HP 9000 manual Running the Program, Loading Programs exec, Binding Routines to a Program
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HP 9000 specifications

The Kenwood HP 9000 is a cutting-edge home appliance designed for culinary enthusiasts seeking to elevate their cooking experience. This powerful kitchen machine stands out for its multi-functionality, combining the roles of a food processor, blender, and mixer into one sleek unit.

One of the flagship features of the Kenwood HP 9000 is its robust motor, which delivers exceptional performance across various tasks. With a powerful motor that operates at multiple speeds, users can tackle everything from kneading dough to finely chopping vegetables with ease. The variable speed control allows for precision, ensuring that every ingredient is processed to perfection according to individual preferences.

The HP 9000 comes equipped with a variety of attachments that enhance its versatility. Among these are a stainless-steel mixing bowl, a dough hook, a whisk, and multiple cutting blades. This extensive array of accessories means that users can whip up delightful pastries, create homemade pasta, or prepare smoothies with minimal hassle. Each attachment is designed for easy attachment and removal, making the transition between tasks seamless and efficient.

Another key characteristic of the Kenwood HP 9000 is its advanced safety features. The design incorporates mechanisms that prevent the machine from operating unless all components are securely in place. This not only gives users peace of mind while cooking but also ensures longevity for the appliance, reducing the risk of wear and tear over time.

In terms of design, the HP 9000 is both modern and aesthetically pleasing. Its ergonomic shape and compact size make it easy to store and use in various kitchen settings, while the high-quality materials used in its construction guarantee durability and longevity. The user interface is intuitive, with clearly labeled buttons that facilitate operation, ensuring that even novice cooks can navigate the machine effortlessly.

Additionally, the Kenwood HP 9000 features innovative technologies, such as an integrated digital timer and a pulse function for added control during food preparation. These features enhance cooking precision, allowing users to achieve consistent results every time.

In summary, the Kenwood HP 9000 is an exceptional kitchen appliance that combines power, versatility, and safety. With its advanced features and user-friendly design, it is an ideal choice for anyone looking to simplify their cooking process while achieving professional-level results. Whether you're whipping up a quick meal or tackling an elaborate recipe, the HP 9000 is a reliable companion that will inspire culinary creativity.
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