minishell/src/sig/sig.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   sig.c                                              :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: jguelen <marvin@42.fr>                     +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/02/20 10:26:05 by jguelen           #+#    #+#             */
/*   Updated: 2025/02/21 14:48:48 by jguelen          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "sig.h"

int	g_signum = 0;

static void	sig_interactive(int signum)
{
	g_signum = signum;
}

/*
** Ignores the signal if it was sent by a kill command.
*/
static void	ignoreif_sent_by_kill(int signum, siginfo_t *siginfo, void *context)
{
	(void *)context;
	if (siginfo->si_code == SI_USER)
		return ;
	g_signum = signum;
}

int	set_interactive_mode_sig_handling(void)
{
	struct sigaction	sig_act;

	ft_bzero(&sig_act);
	sig_act.sa_handler = &sig_int_new_prompt;
	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);
}

int	set_exec_mode_sig_handling(void)
{
	struct sigaction	sig_act;

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

/*
** Can be used at the start of a child process.
** Check if necessary since execve is executed.
** @RETURN Return 0 i case of success, -1 in case of error and errno is set
** to indicate the error.
*/
int	set_default_sig_handling(void)
{
	struct sigaction	sig;
	int					i;

	ft_bzero(&sig);
	sig.sa_handler = SIG_DFL;
	if (sigemptyset(sig.sa_mask) == -1)
		return (-1);
	i = 0;
	while (i < NSIG)
	{
		if (sigaction(i, &sig, NULL) == -1)
			return (-1);
		i++;
	}
	return (0);
}