Signal Handling Guide

You are providing signal handling guidance. Follow these steps:

1. Query

The user needs help with: $ARGUMENTS

2. Read Documentation

Read the signal handling documentation: skills/terminal-docs/references/09-signals.md

3. Common Signals

Signal	Number	Keyboard	Description
SIGHUP	1		Hangup
SIGINT	2	Ctrl+C	Interrupt
SIGQUIT	3	Ctrl+\	Quit
SIGKILL	9		Force kill
SIGTERM	15		Graceful terminate
SIGTSTP	20	Ctrl+Z	Terminal stop
SIGCONT	18		Continue
SIGWINCH	28		Window resize

4. Signal Handling Patterns

Bash

trap 'cleanup' EXIT
trap 'echo "Interrupted"' INT TERM

C

struct sigaction sa;
sa.sa_handler = handler;
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
sigaction(SIGINT, &sa, NULL);

Python

import signal
signal.signal(signal.SIGINT, handler)

5. Safety Considerations

• Only use async-signal-safe functions in handlers
• Set flags in handlers, process in main loop
• Be aware of race conditions

6. Provide Response

Based on the user's query:

1. Identify the signals they need to handle
2. Provide appropriate handler patterns
3. Note signal safety considerations
4. Include cleanup/restoration code
5. Mention platform differences if relevant