/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   exec_command.c                                     :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: jschaft <cecile.schaft@orange.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/04/24 13:48:00 by jschaft           #+#    #+#             */
/*   Updated: 2024/04/30 13:58:04 by mcolonna         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "include.h"

// Free every element of tab, then tab itself.
static void	free_tab(char **tab)
{
	int	i;

	i = 0;
	while (tab[i] != NULL)
	{
		free(tab[i]);
		i++;
	}
	free(tab);
}

static void	fork_exec(const char *path, t_call call, const int inout[2],
				char *const envp[])
{
	dup2(inout[0], 0);
	dup2(inout[1], 1);
	execve(path, call.argv, envp);
}

static int	execute_call(t_memclass mc, t_call call, const int inout[2],
				char *const envp[])
{
	char **const	path = get_path(envp);
	pid_t			pid;
	const char		*program_path;

	program_path = search_path(mc, (const char **)path, call.program);
	if (!program_path)
		return (127);
	pid = fork();
	if (pid < 0)
		return (1);
	if (pid == 0)
		fork_exec(program_path, call, inout, envp);
	free_tab(path);
	return (0);
}

// TODO works with only one call (no pipe).
int	execute_command(t_memclass mc, t_command command, char *const envp[])
{
	const int	inout[] = {command.input_fd, command.output_fd};
	int			nb_calls;
	int			r;

	nb_calls = 1;
	r = execute_call(mc, command.calls[0], inout, envp);
	while (nb_calls)
	{
		wait(NULL);
		nb_calls--;
	}
	return (r);
}