https://www.emblogic.com/forum/categories/003-07-91-assignment-signals-and-handlers/feed.rss Thu, 16 Apr 26 23:10:49 +0530 003.07.91.Assignment. Signals and Handlers - EmbLogic en-CA https://www.emblogic.com/forum/discussion/1729/20-kernel-data-structures-for-managing-signals Mon, 24 Jun 2024 00:57:33 +0530 pravjot 1729@/forum/discussions 20. Kernel Data Structures for Managing Signals

Describe the key signal-related fields within the task_struct in Linux. How does the kernel use these fields to manage pending signals?

]]> https://www.emblogic.com/forum/discussion/1730/19-understanding-pending-signals Mon, 24 Jun 2024 00:57:57 +0530 pravjot 1730@/forum/discussions 19. Understanding Pending Signals

What are pending signals in Linux, and how do they become pending? Explain the concept and scenarios under which signals are marked as pending.

]]> https://www.emblogic.com/forum/discussion/1734/18-using-the-sa_siginfo-flag Mon, 24 Jun 2024 01:14:58 +0530 pravjot 1734@/forum/discussions 18. Using the SA_SIGINFO Flag

What is the SA_SIGINFO flag in the sigaction structure, and how does it modify the behavior of signal handling? Provide an example that demonstrates using SA_SIGINFO to handle the SIGINT signal and retrieve extended information about the signal.

]]> https://www.emblogic.com/forum/discussion/1735/17-setting-up-signal-handlers-with-sigaction Mon, 24 Jun 2024 01:15:14 +0530 pravjot 1735@/forum/discussions 17. Setting Up Signal Handlers with sigaction

Explain how to set up a signal handler using the sigaction function. Provide an example of setting up a handler for the SIGINT signal that blocks the SIGTERM signal during its execution.

]]> https://www.emblogic.com/forum/discussion/1736/16-understanding-struct-sigaction Mon, 24 Jun 2024 01:15:32 +0530 pravjot 1736@/forum/discussions 16. Understanding struct sigaction

Describe the purpose of the struct sigaction in Linux signal handling. What fields does this structure contain, and what are their roles?

]]> https://www.emblogic.com/forum/discussion/1737/15-using-sa_siginfo-for-extended-signal-information Mon, 24 Jun 2024 01:35:26 +0530 pravjot 1737@/forum/discussions 15. Using SA_SIGINFO for Extended Signal Information

Describe the purpose of the SA_SIGINFO flag in the sigaction structure. Provide an example of using SA_SIGINFO to handle the SIGINT signal and access detailed information about the signal, such as the sending process ID.

]]> https://www.emblogic.com/forum/discussion/1738/14-blocking-signals-during-handler-execution Mon, 24 Jun 2024 01:35:48 +0530 pravjot 1738@/forum/discussions 14. Blocking Signals During Handler Execution

Explain how to block signals during the execution of a signal handler using the sigaction structure. Provide an example of blocking SIGTERM while handling SIGINT.

]]> https://www.emblogic.com/forum/discussion/1739/13-understanding-sigaction Mon, 24 Jun 2024 01:36:03 +0530 pravjot 1739@/forum/discussions 13. Understanding sigaction

What is the sigaction function and how does it provide more robust and flexible signal handling compared to the signal() function? Describe the structure and key fields of struct sigaction.

]]> https://www.emblogic.com/forum/discussion/1740/12-ignoring-and-restoring-default-signal-handling Mon, 24 Jun 2024 01:37:37 +0530 pravjot 1740@/forum/discussions 12. Ignoring and Restoring Default Signal Handling

Describe how to ignore a signal in a C program using the signal() function. Additionally, explain how to restore the default action for a signal after setting a custom handler. Provide examples for both scenarios using the SIGINT signal.

]]> https://www.emblogic.com/forum/discussion/1741/11-characteristics-and-best-practices-of-signal-handlers Mon, 24 Jun 2024 01:37:50 +0530 pravjot 1741@/forum/discussions 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.

]]> https://www.emblogic.com/forum/discussion/1742/10-defining-and-using-signal-handlers Mon, 24 Jun 2024 01:38:03 +0530 pravjot 1742@/forum/discussions 10. Defining and Using Signal Handlers

Explain how to define and set up a signal handler in C using the signal() function. Provide an example of handling the SIGINT signal and describe what happens when Ctrl+C is pressed.

]]> https://www.emblogic.com/forum/discussion/1743/9-catching-signals-with-custom-handlers Mon, 24 Jun 2024 01:40:28 +0530 pravjot 1743@/forum/discussions 9. Catching Signals with Custom Handlers

What does catching a signal mean in the context of signal handling in Linux? Illustrate with an example how to catch the SIGINT signal using a custom signal handler function.

]]> https://www.emblogic.com/forum/discussion/1744/8-ignoring-signals Mon, 24 Jun 2024 01:43:13 +0530 pravjot 1744@/forum/discussions 8. Ignoring Signals

Explain how a process can ignore a signal in Linux. Provide an example of how to ignore the SIGINT signal using the signal() function.

]]> https://www.emblogic.com/forum/discussion/1745/7-default-actions-of-signals Mon, 24 Jun 2024 01:43:28 +0530 pravjot 1745@/forum/discussions 7. Default Actions of Signals

Describe the default actions associated with signals in Linux. What are some common default actions that a signal can trigger if no custom signal handler is set up?

]]> https://www.emblogic.com/forum/discussion/1746/6-practical-signal-handling-with-signal-function Mon, 24 Jun 2024 01:48:25 +0530 pravjot 1746@/forum/discussions 6. Practical Signal Handling with signal() Function

Describe how the signal() function works in setting up a signal handler in a C program. Provide a brief example of how to use signal() to catch the SIGINT signal (generated by typing Ctrl+C) and handle it with a custom function. What are the possible return values of the signal() function and their significance?

]]> https://www.emblogic.com/forum/discussion/1747/5-common-signals-and-their-effects Mon, 24 Jun 2024 01:48:38 +0530 pravjot 1747@/forum/discussions 5. Common Signals and Their Effects

List at least five common signals defined in the signal.h header file and describe their typical use or effect on a process. How does the system handle these signals if the process has not set up a custom signal handler?

]]> https://www.emblogic.com/forum/discussion/1748/4-understanding-signal-generation-and-handling Mon, 24 Jun 2024 01:48:50 +0530 pravjot 1748@/forum/discussions 4. Understanding Signal Generation and Handling

Explain the terms "raise" and "catch" in the context of signal handling in UNIX and Linux systems. What are some common conditions that raise signals, and how can processes handle these signals?

]]> https://www.emblogic.com/forum/discussion/1749/3-signal-handling Mon, 24 Jun 2024 01:53:41 +0530 pravjot 1749@/forum/discussions 3. Signal Handling

Describe how a process can handle signals in Linux. What are the possible actions a process can take when a signal is delivered, and how can a signal handler function be set up using the signal() function?

]]> https://www.emblogic.com/forum/discussion/1750/2-signal-characteristics-and-types Mon, 24 Jun 2024 01:53:54 +0530 pravjot 1750@/forum/discussions 2. Signal Characteristics and Types

Explain the characteristics of signals in Linux. What are the two broad categories of signals, and provide examples of each.

]]> https://www.emblogic.com/forum/discussion/1751/1-understanding-signals Mon, 24 Jun 2024 01:54:06 +0530 pravjot 1751@/forum/discussions 1. Understanding Signals

What are signals in the context of Linux and UNIX-like operating systems, and how do they function as a form of inter-process communication?

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