Signals are a fundamental part of Linux process management, yet their lifecycle is often misunderstood. This post breaks down what happens after a signal is generated: how it enters a pending state, how blocking affects delivery, and when core dumps occur. It explains the kernel's role in managing signal queues and the interaction between user-space and kernel-space. For developers working on system-level code, understanding these mechanics is crucial for debugging and writing robust applications. The post also touches on signal masks and the difference between standard and real-time signals. This knowledge is essential for anyone dealing with process control, daemons, or crash analysis.
A clear explanation of Linux signal lifecycle, including pending, blocking, and core dump mechanisms.