feat: add signal handling for Ctrl+C and Ctrl+Z

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)

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
 

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);
+}

signals.h

@@ -0,0 +1,6 @@
+#ifndef SIGNALS_H
+#define SIGNALS_H
+
+void setup_signal_handlers(void);
+
+#endif