minishell/src/sig/sig.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   sig.c                                              :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: kcolin <kcolin@42.fr>                      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/05/02 12:16:37 by kcolin            #+#    #+#             */
/*   Updated: 2025/05/02 12:18:17 by kcolin           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "sig.h"
#include "signal.h"
#include "sig_handlers.h"

/*
** g_signum exists to store the value of a signal if relevant for later
** processing.
** NOTE: g_signum starts at 0 and should be set back to 0 after the information
** it stores has been properly processed.
*/
int	g_signum = 0;

/*
** Catches SIGINT and SIGQUIT.
** Set to ignore SIGQUIT and catch SIGINT to set g_signum for
** further processing when in interactive mode.
*/
int	set_interactive_mode_sig_handling(void)
{
	struct sigaction	sig_act;

	ft_bzero(&sig_act, sizeof(struct sigaction));
	sig_act.sa_handler = &sig_interactive;
	sig_act.sa_flags |= SA_RESTART;
	if (sigemptyset(&sig_act.sa_mask) == -1)
		return (-1);
	if (sigaction(SIGINT, &sig_act, NULL) == -1)
		return (-1);
	sig_act.sa_handler = SIG_IGN;
	if (sigaction(SIGQUIT, &sig_act, NULL) == -1)
		return (-1);
	return (0);
}

/*
** Set to ignore SIGINT and SIGQUIT signals if they are generated through
** a call to kill when the program is currently executing commands.
** Otherwise set g_signum to the number corresponding to the caught signal.
*/
int	set_exec_mode_sig_handling(void)
{
	struct sigaction	sig_act;

	ft_bzero(&sig_act, sizeof(struct sigaction));
	if (sigemptyset(&sig_act.sa_mask) == -1)
		return (-1);
	sig_act.sa_sigaction = &sig_cmd;
	sig_act.sa_flags |= SA_SIGINFO;
	sig_act.sa_flags |= SA_RESTART;
	if (sigaction(SIGINT, &sig_act, NULL) == -1)
		return (-1);
	if (sigaction(SIGQUIT, &sig_act, NULL) == -1)
		return (-1);
	return (0);
}

/*
** Set to ignore SIGINT and SIGQUIT signals if they are generated through
** a call to kill when the program is currently executing commands.
** Otherwise set g_signum to the number corresponding to the caught signal.
*/
int	set_here_doc_mode_sig_handling(void)
{
	struct sigaction	sig_act;

	ft_bzero(&sig_act, sizeof(struct sigaction));
	if (sigemptyset(&sig_act.sa_mask) == -1)
		return (-1);
	sig_act.sa_sigaction = &sig_cmd;
	sig_act.sa_flags |= SA_SIGINFO;
	if (sigaction(SIGINT, &sig_act, NULL) == -1)
		return (-1);
	sig_act.sa_handler = SIG_IGN;
	sig_act.sa_flags = 0;
	if (sigaction(SIGQUIT, &sig_act, NULL) == -1)
		return (-1);
	return (0);
}