minishell/src/executing/connec_cmd/connec_pipe_cmd_execute.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   connec_pipe_cmd_execute.c                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: khais <marvin@42.fr>                       +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/04/11 12:01:29 by khais             #+#    #+#             */
/*   Updated: 2025/04/16 16:56:55 by khais            ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "connec_pipe_cmd_execute.h"
#include "../common/do_waitpid.h"
#include <unistd.h>
#include <stdio.h>
#include "../cmd/cmd_execute.h"

static void	pipe_do_close(int pipefd[2])
{
	close(pipefd[0]);
	close(pipefd[1]);
}

static void	dup_and_close(int fd, int fd2, int pipefd[2])
{
	dup2(fd, fd2);
	pipe_do_close(pipefd);
}

static int	do_pipe(int pipefd[2], t_minishell *app)
{
	if (pipe(pipefd) < 0)
	{
		perror("minishell: pipe");
		app->last_return_value = 2;
		return (-1);
	}
	return (0);
}

static void	close_and_wait(t_minishell *app, int pid1, int pid2, int pipefd[2])
{
	pipe_do_close(pipefd);
	do_waitpid(app, pid1);
	do_waitpid(app, pid2);
}

void	connec_pipe_cmd_execute(t_connec_cmd *cmd, t_minishell *app,
			bool should_exit)
{
	int	pid1;
	int	pid2;
	int	pipefd[2];

	if (do_pipe(pipefd, app) < 0)
		return ;
	pid1 = fork();
	if (pid1 == 0)
	{
		dup_and_close(pipefd[1], STDOUT_FILENO, pipefd);
		cmd_execute(cmd->first, app, true);
		return ;
	}
	pid2 = fork();
	if (pid2 == 0)
	{
		dup_and_close(pipefd[0], STDIN_FILENO, pipefd);
		cmd_execute(cmd->second, app, true);
	}
	else
	{
		close_and_wait(app, pid1, pid2, pipefd);
		if (should_exit)
			exit(app->last_return_value);
	}
}