The Unix program design basics lecture 3 covers the fundamental concepts of processes and signals. It was presented by Xie Han on February 10, 2004, and discussed the following topics:
1. Process basics: The lecture revisited the concept of processes, which are independent sets of instructions with their own address space. It explained the five basic states of a process: new, ready, running, sleeping, and zombie. The lecture also covered the process ID, parent and child processes, and multi-processing programming in Unix, including the fork and execve functions for creating processes and running programs, and wait and waitpid for retrieving the exit status of child processes.
2. Signals: The lecture introduced signals as a means for the Unix operating system to notify processes of certain events, also known as software interrupts. It discussed several common signals and covered signal programming using the signal and sigaction functions to change signal actions, as well as the alarm function for setting alarms. The lecture also touched upon non-reentrant functions and the need for more powerful signal action changing functions like sigaction.
The lecture recommended reading further on the topic and also provided information on the kill and raise functions for sending signals.
Overall, the lecture provided a comprehensive overview of process basics and signal programming in Unix, laying the foundation for understanding more advanced concepts in Unix program design. Students were encouraged to further explore the topic through additional reading and practice.
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