11. Characteristics and Best Practices of Signal Handlers
What are the key characteristics of signal handlers in Linux? Discuss the concepts of asynchronous execution, reentrancy, and atomic operations, and explain why they are important.
Asynchronous execution: Signal handlers can be called at any time, interrupting the normal flow of execution. This means that the state of the program might be unpredictable when the handler is executed.
Reentrancy: Signal handlers must be reentrant, meaning they can safely be called again before a previous invocation completes. Only certain functions are safe to call from within a signal handler.
Atomic Operations: Its important to use atomic operations or 'sig_atomic_t' type variables within handlers to ensure consistency and avoid race conditions.
