From 70e39a56490162c5ee087dac2d4400d8739f72c4 Mon Sep 17 00:00:00 2001
From: "google-labs-jules[bot]"
 <161369871+google-labs-jules[bot]@users.noreply.github.com>
Date: Wed, 8 Oct 2025 16:44:58 +0000
Subject: [PATCH] feat: add signal handling for Ctrl+C and Ctrl+Z

This commit introduces signal handling for SIGINT (Ctrl+C) and SIGTSTP (Ctrl+Z) t

- A new "sigint_handler" function is implemented to catch the SIGINT signal. Instead of terminating the shell now clears the current input line and displays a fresh prompt.
- The SIGTSTP signal is now ignored, preventing the shell from being suspended with Ctrl+Z.
- The signal handlers are registered at the start of the shell's execution.
---
 Makefile  |  2 +-
 main.c    |  3 +++
 signals.c | 28 ++++++++++++++++++++++++++++
 signals.h |  6 ++++++
 4 files changed, 38 insertions(+), 1 deletion(-)
 create mode 100644 signals.c
 create mode 100644 signals.h

diff --git a/Makefile b/Makefile
index ced3727..c417be1 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,7 @@
 CC = gcc
 CFLAGS = -Wall -g
 LDFLAGS = -lreadline
-OBJS = main.o parser.o builtins.o executor.o prompt.o history.o
+OBJS = main.o parser.o builtins.o executor.o prompt.o history.o signals.o
 TARGET = myshell
 
 all: $(TARGET)
diff --git a/main.c b/main.c
index 5202ce3..4d1ef6a 100644
--- a/main.c
+++ b/main.c
@@ -5,10 +5,13 @@
 #include "builtins.h"
 #include "prompt.h"
 #include "history.h"
+#include "signals.h"
 
 int main() {
     char *input;
 
+    setup_signal_handlers();
+
     while (1) {
         input = get_prompt();  // custom prompt with readline
 
diff --git a/signals.c b/signals.c
new file mode 100644
index 0000000..c68e4e6
--- /dev/null
+++ b/signals.c
@@ -0,0 +1,28 @@
+#include <stdio.h>
+#include <signal.h>
+#include <readline/readline.h>
+#include <readline/history.h>
+
+/*
+    Signal handler for SIGINT (Ctrl+C).
+    It clears the current input line and displays a new prompt.
+*/
+void sigint_handler(int signo) {
+    (void)signo;
+    printf("\n");
+    rl_on_new_line();
+    rl_replace_line("", 0);
+    rl_redisplay();
+}
+
+/*
+    Sets up the signal handlers for the shell.
+    - SIGINT (Ctrl+C) is caught to prevent the shell from exiting.
+    - SIGTSTP (Ctrl+Z) is ignored to prevent the shell from being suspended.
+    - SIGQUIT (Ctrl+\) is also ignored.
+*/
+void setup_signal_handlers(void) {
+    signal(SIGINT, sigint_handler);
+    signal(SIGTSTP, SIG_IGN);
+    signal(SIGQUIT, SIG_IGN);
+}
\ No newline at end of file
diff --git a/signals.h b/signals.h
new file mode 100644
index 0000000..407e894
--- /dev/null
+++ b/signals.h
@@ -0,0 +1,6 @@
+#ifndef SIGNALS_H
+#define SIGNALS_H
+
+void setup_signal_handlers(void);
+
+#endif
\ No newline at end of file