Session 11 GNU Linux Process Model | Linux Application Programming | Linux Programming

Creating Processes with fork
Review of Process- related API Functions
Raising and Catching Signals
Available Signals and Their Uses
GNU/Linux Process-related Commands

In this session, well introduce the GNU/Linux process model. Well define elements of a process, how processes communicate with each other, and how to control and monitor them. First, well do a quick review of fundamental APIs and then follow up with a more detailed review, complete with sample applications that illustrate each technique.
GNULinux Processes
GNU/Linux presents two fundamental types of processes. These are kernel threads and user processes. We’ll focus our attention here to user processes, created by fork and clone. Kernel threads are created within the kernel context via the kernel__thread function.
When a subprocess is created, via fork, a new child task is created with a copy of the memory used by the original parent task. This memory is separate between the two processes. Any variables present when the fork takes place are available to the child. But after the fork completes, any changes that the parent makes to a variable are not seen by the child.
Certain elements are not copied from the parent and instead are created specifically for the child. What’s relevant to understand at this stage is that a process can create subprocesses, known as children, and generally control them.
We can create a new process with the fork or clone API function. But in fact, we create a new process every time we execute a command or start a program.
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